adding nrf52840 port, able to blink led with pca10056

2018-03-11 00:16:10 +07:00 · 2018-03-11 00:16:10 +07:00 · 23caef859c
parent 0af637cd4f
commit 23caef859c
23 changed files with 24852 additions and 3 deletions
--- a/examples/device/device_virtual_com/segger/device_virtual_com.emSession
+++ b/examples/device/device_virtual_com/segger/device_virtual_com.emSession
@ -75,7 +75,6 @@
  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="251" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/bsp/ea4357/nand.c" debugPath="../../../../hw/bsp/ea4357/nand.c" selected="0" top="243" codecName="Default"/>
  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="276" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/bsp/ea4357/oem_base_board/norflash.c" debugPath="../../../../hw/bsp/ea4357/oem_base_board/norflash.c" selected="0" top="269" codecName="Default"/>
  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="149" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/mcu/nxp/lpc43xx/CMSIS_LPC43xx_DriverLib/src/lpc43xx_emc.c" debugPath="../../../../hw/mcu/nxp/lpc43xx/CMSIS_LPC43xx_DriverLib/src/lpc43xx_emc.c" selected="0" top="130" codecName="Default"/>
-  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="663" useTextEdit="1" useBinaryEdit="0" left="0" path="system_LPC43xx.c" debugPath="system_LPC43xx.c" selected="0" top="660" codecName="Default"/>
  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="39" useTextEdit="1" useBinaryEdit="0" left="0" path="LPC43xx_Vectors.s" debugPath="LPC43xx_Vectors.s" selected="1" top="22" codecName="Default"/>
  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="0" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/bsp/board.c" debugPath="../../../../hw/bsp/board.c" selected="0" top="72" codecName="Default"/>
  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="87" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/bsp/printf_retarget.c" debugPath="../../../../hw/bsp/printf_retarget.c" selected="0" top="73" codecName="Default"/>
--- a/examples/device/device_virtual_com/xpresso/.cproject
+++ b/examples/device/device_virtual_com/xpresso/.cproject
@ -88,7 +88,7 @@
 						</toolChain>
 					</folderInfo>
 					<sourceEntries>
-						<entry excluding="hw/bsp/ngx|hw/bsp/lpcxpresso1769|hw/bsp/lpcxpresso1347|hw/bsp/lpcxpresso11u68|hw/bsp/lpcxpresso|hw/bsp/keil|hw/bsp/hitex|hw/mcu/nxp/lpc175x_6x|hw/mcu/nxp/lpc13uxx|hw/mcu/nxp/lpc11uxx" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name=""/>
+						<entry excluding="hw/mcu/nordic|hw/bsp/pca10056|hw/bsp/ngx|hw/bsp/lpcxpresso1769|hw/bsp/lpcxpresso1347|hw/bsp/lpcxpresso11u68|hw/bsp/lpcxpresso|hw/bsp/keil|hw/bsp/hitex|hw/mcu/nxp/lpc175x_6x|hw/mcu/nxp/lpc13uxx|hw/mcu/nxp/lpc11uxx" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name=""/>
 					</sourceEntries>
 				</configuration>
 			</storageModule>
--- a/examples/device/nrf52840/segger/nRF52840_xxAA_MemoryMap.xml
+++ b/examples/device/nrf52840/segger/nRF52840_xxAA_MemoryMap.xml
@ -0,0 +1,5 @@
+<!DOCTYPE Board_Memory_Definition_File>
+<root name="nRF52840_xxAA">
+  <MemorySegment name="FLASH" start="0x00000000" size="0x00100000" access="ReadOnly" />
+  <MemorySegment name="RAM" start="0x20000000" size="0x00040000" access="Read/Write" />
+</root>
--- a/examples/device/nrf52840/segger/nRF_Target.js
+++ b/examples/device/nrf52840/segger/nRF_Target.js
@ -0,0 +1,19 @@
+/*****************************************************************************
+ *                   SEGGER Microcontroller GmbH & Co. KG                    *
+ *            Solutions for real time microcontroller applications           *
+ *****************************************************************************
+ *                                                                           *
+ *               (c) 2017 SEGGER Microcontroller GmbH & Co. KG               *
+ *                                                                           *
+ *           Internet: www.segger.com   Support: support@segger.com          *
+ *                                                                           *
+ *****************************************************************************/
+
+function Reset() {
+  TargetInterface.resetAndStop();
+}
+
+function EnableTrace(traceInterfaceType) {
+  // TODO: Enable trace
+}
+
--- a/examples/device/nrf52840/segger/nrf.h
+++ b/examples/device/nrf52840/segger/nrf.h
@ -0,0 +1,93 @@
+/*
+
+Copyright (c) 2010 - 2017, Nordic Semiconductor ASA All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+3. Neither the name of Nordic Semiconductor ASA nor the names of its
+   contributors may be used to endorse or promote products derived from this
+   software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+*/
+
+#ifndef NRF_H
+#define NRF_H
+
+/* MDK version */
+#define MDK_MAJOR_VERSION   8
+#define MDK_MINOR_VERSION   15
+#define MDK_MICRO_VERSION   0
+
+/* Redefine "old" too-generic name NRF52 to NRF52832_XXAA to keep backwards compatibility. */
+#if defined (NRF52)
+    #ifndef NRF52832_XXAA
+        #define NRF52832_XXAA
+    #endif
+#endif
+
+/* Define NRF52_SERIES for common use in nRF52 series devices. Only if not previously defined. */
+#if defined (NRF52810_XXAA) || defined (NRF52832_XXAA) || defined (NRF52832_XXAB) || defined (NRF52840_XXAA)
+    #ifndef NRF52_SERIES
+        #define NRF52_SERIES
+    #endif
+#endif
+
+
+#if defined(_WIN32)
+    /* Do not include nrf specific files when building for PC host */
+#elif defined(__unix)
+    /* Do not include nrf specific files when building for PC host */
+#elif defined(__APPLE__)
+    /* Do not include nrf specific files when building for PC host */
+#else
+
+    /* Device selection for device includes. */
+    #if defined (NRF51)
+        #include "nrf51.h"
+        #include "nrf51_bitfields.h"
+        #include "nrf51_deprecated.h"
+    #elif defined (NRF52840_XXAA)
+        #include "nrf52840.h"
+        #include "nrf52840_bitfields.h"
+        #include "nrf51_to_nrf52840.h"
+        #include "nrf52_to_nrf52840.h"
+    #elif defined (NRF52832_XXAA) || defined (NRF52832_XXAB)
+        #include "nrf52.h"
+        #include "nrf52_bitfields.h"
+        #include "nrf51_to_nrf52.h"
+        #include "nrf52_name_change.h"
+    #elif defined (NRF52810_XXAA)
+        #include "nrf52810.h"
+        #include "nrf52810_bitfields.h"
+        #include "nrf51_to_nrf52810.h"
+        #include "nrf52_to_nrf52810.h"
+    #else
+        #error "Device must be defined. See nrf.h."
+    #endif /* NRF51, NRF52832_XXAA, NRF52832_XXAB, NRF52810_XXAA, NRF52840_XXAA */
+
+    #include "compiler_abstraction.h"
+
+#endif /* _WIN32 || __unix || __APPLE__ */
+
+#endif /* NRF_H */
+
--- a/examples/device/nrf52840/segger/nrf52840.emProject
+++ b/examples/device/nrf52840/segger/nrf52840.emProject
@ -0,0 +1,108 @@
+<!DOCTYPE CrossStudio_Project_File>
+<solution Name="nrf52840" target="8" version="2">
+  <project Name="nrf52840">
+    <configuration
+      Name="Common"
+      Placement="Flash"
+      Target="nRF52840_xxAA"
+      arm_architecture="v7EM"
+      arm_core_type="Cortex-M4"
+      arm_endian="Little"
+      arm_fp_abi="Hard"
+      arm_fpu_type="FPv4-SP-D16"
+      arm_interwork="No"
+      arm_linker_heap_size="1024"
+      arm_linker_process_stack_size="0"
+      arm_linker_stack_size="1024"
+      arm_simulator_memory_simulation_parameter="ROM;0x00000000;0x00100000;RAM;0x20000000;0x00040000"
+      arm_target_debug_interface_type="ADIv5"
+      arm_target_device_name="nRF52840_xxAA"
+      arm_target_interface_type="SWD"
+      c_preprocessor_definitions="NRF52840_XXAA;__nRF_FAMILY;ARM_MATH_CM4;FLASH_PLACEMENT=1;BOARD_PCA10056"
+      c_user_include_directories="$(ProjectDir)/CMSIS_4/CMSIS/Include;$(ProjectDir)/nRF/CMSIS/Device/Include;$(RepoDir)/hw/cmsis/Include;$(RepoDir)/hw;$(McuDir)/hal;$(RepoDir)/tinyusb;$(McuDir)/sdk;$(McuDir)/sdk/drivers_nrf/hal;$(McuDir)/sdk/drivers_nrf/systick;$(McuDir)/sdk/drivers_nrf/uart;$(McuDir)/sdk/drivers_nrf/usbd;$(McuDir)/sdk/drivers_nrf/common;$(McuDir)/sdk/drivers_nrf/delay;$(McuDir)/sdk/drivers_nrf/power;$(McuDir)/sdk/drivers_nrf/clock;$(McuDir)/sdk/external/fprintf;$(McuDir)/sdk/libraries/util;$(McuDir)/sdk/libraries/strerror;$(McuDir)/sdk/libraries/atomic;$(McuDir)/sdk/libraries/balloc;$(McuDir)/sdk/libraries/experimental_log/src;$(McuDir)/sdk/libraries/experimental_log;$(McuDir)/sdk/libraries/experimental_section_vars;$(McuDir)/sdk/libraries/experimental_memobj;$(McuDir)/sdk/softdevice/s140/headers;$(McuDir)/sdk/softdevice/s140/headers/nrf52;$(McuDir)/sdk/softdevice/common;../src"
+      debug_register_definition_file="$(ProjectDir)/nrf52840_Registers.xml"
+      debug_target_connection="J-Link"
+      gcc_entry_point="Reset_Handler"
+      linker_memory_map_file="$(ProjectDir)/nRF52840_xxAA_MemoryMap.xml"
+      linker_section_placement_file="$(ProjectDir)/flash_placement.xml"
+      macros="DeviceHeaderFile=$(PackagesDir)/nRF/CMSIS/Device/Include/nrf.h;DeviceLibraryIdentifier=M4lf;DeviceSystemFile=$(PackagesDir)/nRF/CMSIS/Device/Source/system_nrf52840.c;DeviceVectorsFile=$(PackagesDir)/nRF/Source/ses_nrf52840_Vectors.s;DeviceFamily=nRF;Target=nRF52840_xxAA;Placement=Flash;RepoDir=../../../..;McuDir=../../../../hw/mcu/nordic/nrf52"
+      project_directory=""
+      project_type="Executable"
+      target_reset_script="Reset();"
+      target_script_file="$(ProjectDir)/nRF_Target.js"
+      target_trace_initialize_script="EnableTrace(&quot;$(TraceInterfaceType)&quot;)" />
+    <folder Name="CMSIS Files">
+      <file file_name="nrf.h" />
+      <file file_name="system_nrf52840.c">
+        <configuration
+          Name="Common"
+          default_code_section=".init"
+          default_const_section=".init_rodata" />
+      </file>
+    </folder>
+    <folder Name="RTT Files">
+      <file file_name="SEGGER_RTT.c" />
+      <file file_name="SEGGER_RTT.h" />
+      <file file_name="SEGGER_RTT_Conf.h" />
+      <file file_name="SEGGER_RTT_SES.c" />
+    </folder>
+    <folder Name="Script Files">
+      <file file_name="nRF_Target.js">
+        <configuration Name="Common" file_type="Reset Script" />
+      </file>
+    </folder>
+    <folder Name="System Files">
+      <file file_name="thumb_crt0.s" />
+      <file file_name="ses_nRF_Startup.s" />
+      <file file_name="ses_nrf52840_Vectors.s">
+        <configuration Name="Common" file_type="Assembly" />
+      </file>
+    </folder>
+    <folder
+      Name="tinyusb"
+      exclude=""
+      filter="*.c;*.h"
+      path="../../../../tinyusb"
+      recurse="Yes" />
+    <folder Name="src">
+      <file file_name="../src/main.c" />
+      <file file_name="../src/tusb_config.h" />
+      <file file_name="../src/tusb_descriptors.c" />
+      <file file_name="../src/tusb_descriptors.h" />
+    </folder>
+    <folder Name="hw">
+      <folder Name="bsp">
+        <folder Name="pca10056">
+          <file file_name="../../../../hw/bsp/pca10056/board_pca10056.c" />
+          <file file_name="../../../../hw/bsp/pca10056/board_pca10056.h" />
+        </folder>
+      </folder>
+      <folder Name="mcu">
+        <folder Name="nordic">
+          <folder Name="nrf52">
+            <folder Name="hal">
+              <file file_name="../../../../hw/mcu/nordic/nrf52/hal/hal_nrf52.c" />
+            </folder>
+            <folder
+              Name="sdk"
+              exclude=""
+              filter="*.c;*.h"
+              path="../../../../hw/mcu/nordic/nrf52/sdk"
+              recurse="Yes" />
+          </folder>
+        </folder>
+      </folder>
+    </folder>
+  </project>
+  <configuration
+    Name="Debug"
+    c_preprocessor_definitions="DEBUG"
+    gcc_debugging_level="Level 3"
+    gcc_optimization_level="None" />
+  <configuration
+    Name="Release"
+    c_preprocessor_definitions="NDEBUG"
+    gcc_debugging_level="None"
+    gcc_omit_frame_pointer="Yes"
+    gcc_optimization_level="Level 1" />
+</solution>
--- a/examples/device/nrf52840/segger/nrf52840.emSession
+++ b/examples/device/nrf52840/segger/nrf52840.emSession
@ -0,0 +1,104 @@
+<!DOCTYPE CrossStudio_Session_File>
+<session>
+ <Bookmarks/>
+ <Breakpoints groups="Breakpoints" active_group="Breakpoints">
+  <Exceptions set="MemManage;UsageFault_Coprocessor;UsageFault_CheckingError;UsageFault_StateError;BusFault;ExceptionEntryReturnFault;HardFault"/>
+ </Breakpoints>
+ <ExecutionProfileWindow/>
+ <FrameBufferWindow>
+  <FrameBufferWindow bufferHeight="-1" addressSpace="" addressText="" bufferWidth="-1"/>
+ </FrameBufferWindow>
+ <Memory1>
+  <MemoryWindow addressSpace="" dataSize="1" autoEvaluate="0" viewMode="0" addressOrder="0" columnsText="" refreshPeriod="0" name="device_virtual_com" radix="16" sizeText="" addressText=""/>
+  <MemoryWindow addressSpace="" dataSize="1" autoEvaluate="0" viewMode="0" addressOrder="0" columnsText="" refreshPeriod="0" name="nrf52840" radix="16" sizeText="" addressText=""/>
+ </Memory1>
+ <Memory2>
+  <MemoryWindow addressSpace="" dataSize="1" autoEvaluate="0" viewMode="0" addressOrder="0" columnsText="" refreshPeriod="0" name="device_virtual_com" radix="16" sizeText="" addressText=""/>
+  <MemoryWindow addressSpace="" dataSize="1" autoEvaluate="0" viewMode="0" addressOrder="0" columnsText="" refreshPeriod="0" name="nrf52840" radix="16" sizeText="" addressText=""/>
+ </Memory2>
+ <Memory3>
+  <MemoryWindow addressSpace="" dataSize="1" autoEvaluate="0" viewMode="0" addressOrder="0" columnsText="" refreshPeriod="0" name="device_virtual_com" radix="16" sizeText="" addressText=""/>
+  <MemoryWindow addressSpace="" dataSize="1" autoEvaluate="0" viewMode="0" addressOrder="0" columnsText="" refreshPeriod="0" name="nrf52840" radix="16" sizeText="" addressText=""/>
+ </Memory3>
+ <Memory4>
+  <MemoryWindow addressSpace="" dataSize="1" autoEvaluate="0" viewMode="0" addressOrder="0" columnsText="" refreshPeriod="0" name="device_virtual_com" radix="16" sizeText="" addressText=""/>
+  <MemoryWindow addressSpace="" dataSize="1" autoEvaluate="0" viewMode="0" addressOrder="0" columnsText="" refreshPeriod="0" name="nrf52840" radix="16" sizeText="" addressText=""/>
+ </Memory4>
+ <Project>
+  <ProjectSessionItem path="nrf52840"/>
+  <ProjectSessionItem path="nrf52840;nrf52840"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;hw"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;hw;bsp"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;hw;bsp;pca10056"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;hw;mcu"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;hw;mcu;nordic"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;hw;mcu;nordic;nrf52"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;hw;mcu;nordic;nrf52;hal"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;hw;mcu;nordic;nrf52;sdk"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;hw;mcu;nordic;nrf52;sdk;libraries"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;hw;mcu;nordic;nrf52;sdk;libraries;experimental_log"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;hw;mcu;nordic;nrf52;sdk;libraries;experimental_log;src"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;hw;mcu;nordic;nrf52;sdk;libraries;experimental_memobj"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;hw;mcu;nordic;nrf52;sdk;softdevice"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;hw;mcu;nordic;nrf52;sdk;softdevice;common"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;src"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;tinyusb"/>
+  <ProjectSessionItem path="nrf52840;nrf52840;tinyusb;common"/>
+ </Project>
+ <Register1>
+  <RegisterWindow visibleNodes="CPU - Current Context/r0;CPU - Current Context/r1;CPU - Current Context/r2;CPU - Current Context/r3;CPU - Current Context/r4;CPU - Current Context/r5;CPU - Current Context/r6;CPU - Current Context/r7;CPU - Current Context/r8;CPU - Current Context/r9;CPU - Current Context/r10;CPU - Current Context/r11;CPU - Current Context/r12;CPU - Current Context/sp(r13);CPU - Current Context/lr(r14);CPU - Current Context/pc(r15);CPU - Current Context/apsr;CPU/r0;CPU/r1;CPU/r2;CPU/r3;CPU/r4;CPU/r5;CPU/r6;CPU/r7;CPU/r8;CPU/r9;CPU/r10;CPU/r11;CPU/r12;CPU/sp(r13);CPU/lr(r14);CPU/pc(r15);CPU/xpsr;CPU/msp;CPU/psp;CPU/cfbp" binaryNodes="" asciiNodes="" openNodes="CPU - Current Context" name="device_virtual_com" decimalNodes="" octalNodes="" unsignedNodes=""/>
+  <RegisterWindow visibleNodes="CPU - Current Context/r0;CPU - Current Context/r1;CPU - Current Context/r2;CPU - Current Context/r3;CPU - Current Context/r4;CPU - Current Context/r5;CPU - Current Context/r6;CPU - Current Context/r7;CPU - Current Context/r8;CPU - Current Context/r9;CPU - Current Context/r10;CPU - Current Context/r11;CPU - Current Context/r12;CPU - Current Context/sp(r13);CPU - Current Context/lr(r14);CPU - Current Context/pc(r15);CPU - Current Context/apsr;CPU/r0;CPU/r1;CPU/r2;CPU/r3;CPU/r4;CPU/r5;CPU/r6;CPU/r7;CPU/r8;CPU/r9;CPU/r10;CPU/r11;CPU/r12;CPU/sp(r13);CPU/lr(r14);CPU/pc(r15);CPU/xpsr;CPU/msp;CPU/psp;CPU/cfbp" binaryNodes="" asciiNodes="" openNodes="CPU - Current Context" name="nrf52840" decimalNodes="" octalNodes="" unsignedNodes=""/>
+ </Register1>
+ <Register2>
+  <RegisterWindow visibleNodes="CPU - Current Context/r0;CPU - Current Context/r1;CPU - Current Context/r2;CPU - Current Context/r3;CPU - Current Context/r4;CPU - Current Context/r5;CPU - Current Context/r6;CPU - Current Context/r7;CPU - Current Context/r8;CPU - Current Context/r9;CPU - Current Context/r10;CPU - Current Context/r11;CPU - Current Context/r12;CPU - Current Context/sp(r13);CPU - Current Context/lr(r14);CPU - Current Context/pc(r15);CPU - Current Context/apsr;CPU/r0;CPU/r1;CPU/r2;CPU/r3;CPU/r4;CPU/r5;CPU/r6;CPU/r7;CPU/r8;CPU/r9;CPU/r10;CPU/r11;CPU/r12;CPU/sp(r13);CPU/lr(r14);CPU/pc(r15);CPU/xpsr;CPU/msp;CPU/psp;CPU/cfbp" binaryNodes="" asciiNodes="" openNodes="CPU - Current Context" name="device_virtual_com" decimalNodes="" octalNodes="" unsignedNodes=""/>
+  <RegisterWindow visibleNodes="CPU - Current Context/r0;CPU - Current Context/r1;CPU - Current Context/r2;CPU - Current Context/r3;CPU - Current Context/r4;CPU - Current Context/r5;CPU - Current Context/r6;CPU - Current Context/r7;CPU - Current Context/r8;CPU - Current Context/r9;CPU - Current Context/r10;CPU - Current Context/r11;CPU - Current Context/r12;CPU - Current Context/sp(r13);CPU - Current Context/lr(r14);CPU - Current Context/pc(r15);CPU - Current Context/apsr;CPU/r0;CPU/r1;CPU/r2;CPU/r3;CPU/r4;CPU/r5;CPU/r6;CPU/r7;CPU/r8;CPU/r9;CPU/r10;CPU/r11;CPU/r12;CPU/sp(r13);CPU/lr(r14);CPU/pc(r15);CPU/xpsr;CPU/msp;CPU/psp;CPU/cfbp" binaryNodes="" asciiNodes="" openNodes="CPU - Current Context" name="nrf52840" decimalNodes="" octalNodes="" unsignedNodes=""/>
+ </Register2>
+ <Register3>
+  <RegisterWindow visibleNodes="CPU - Current Context/r0;CPU - Current Context/r1;CPU - Current Context/r2;CPU - Current Context/r3;CPU - Current Context/r4;CPU - Current Context/r5;CPU - Current Context/r6;CPU - Current Context/r7;CPU - Current Context/r8;CPU - Current Context/r9;CPU - Current Context/r10;CPU - Current Context/r11;CPU - Current Context/r12;CPU - Current Context/sp(r13);CPU - Current Context/lr(r14);CPU - Current Context/pc(r15);CPU - Current Context/apsr;CPU/r0;CPU/r1;CPU/r2;CPU/r3;CPU/r4;CPU/r5;CPU/r6;CPU/r7;CPU/r8;CPU/r9;CPU/r10;CPU/r11;CPU/r12;CPU/sp(r13);CPU/lr(r14);CPU/pc(r15);CPU/xpsr;CPU/msp;CPU/psp;CPU/cfbp" binaryNodes="" asciiNodes="" openNodes="CPU - Current Context" name="device_virtual_com" decimalNodes="" octalNodes="" unsignedNodes=""/>
+  <RegisterWindow visibleNodes="CPU - Current Context/r0;CPU - Current Context/r1;CPU - Current Context/r2;CPU - Current Context/r3;CPU - Current Context/r4;CPU - Current Context/r5;CPU - Current Context/r6;CPU - Current Context/r7;CPU - Current Context/r8;CPU - Current Context/r9;CPU - Current Context/r10;CPU - Current Context/r11;CPU - Current Context/r12;CPU - Current Context/sp(r13);CPU - Current Context/lr(r14);CPU - Current Context/pc(r15);CPU - Current Context/apsr;CPU/r0;CPU/r1;CPU/r2;CPU/r3;CPU/r4;CPU/r5;CPU/r6;CPU/r7;CPU/r8;CPU/r9;CPU/r10;CPU/r11;CPU/r12;CPU/sp(r13);CPU/lr(r14);CPU/pc(r15);CPU/xpsr;CPU/msp;CPU/psp;CPU/cfbp" binaryNodes="" asciiNodes="" openNodes="CPU - Current Context" name="nrf52840" decimalNodes="" octalNodes="" unsignedNodes=""/>
+ </Register3>
+ <Register4>
+  <RegisterWindow visibleNodes="CPU - Current Context/r0;CPU - Current Context/r1;CPU - Current Context/r2;CPU - Current Context/r3;CPU - Current Context/r4;CPU - Current Context/r5;CPU - Current Context/r6;CPU - Current Context/r7;CPU - Current Context/r8;CPU - Current Context/r9;CPU - Current Context/r10;CPU - Current Context/r11;CPU - Current Context/r12;CPU - Current Context/sp(r13);CPU - Current Context/lr(r14);CPU - Current Context/pc(r15);CPU - Current Context/apsr;CPU/r0;CPU/r1;CPU/r2;CPU/r3;CPU/r4;CPU/r5;CPU/r6;CPU/r7;CPU/r8;CPU/r9;CPU/r10;CPU/r11;CPU/r12;CPU/sp(r13);CPU/lr(r14);CPU/pc(r15);CPU/xpsr;CPU/msp;CPU/psp;CPU/cfbp" binaryNodes="" asciiNodes="" openNodes="CPU - Current Context" name="device_virtual_com" decimalNodes="" octalNodes="" unsignedNodes=""/>
+  <RegisterWindow visibleNodes="CPU - Current Context/r0;CPU - Current Context/r1;CPU - Current Context/r2;CPU - Current Context/r3;CPU - Current Context/r4;CPU - Current Context/r5;CPU - Current Context/r6;CPU - Current Context/r7;CPU - Current Context/r8;CPU - Current Context/r9;CPU - Current Context/r10;CPU - Current Context/r11;CPU - Current Context/r12;CPU - Current Context/sp(r13);CPU - Current Context/lr(r14);CPU - Current Context/pc(r15);CPU - Current Context/apsr;CPU/r0;CPU/r1;CPU/r2;CPU/r3;CPU/r4;CPU/r5;CPU/r6;CPU/r7;CPU/r8;CPU/r9;CPU/r10;CPU/r11;CPU/r12;CPU/sp(r13);CPU/lr(r14);CPU/pc(r15);CPU/xpsr;CPU/msp;CPU/psp;CPU/cfbp" binaryNodes="" asciiNodes="" openNodes="CPU - Current Context" name="nrf52840" decimalNodes="" octalNodes="" unsignedNodes=""/>
+ </Register4>
+ <TraceWindow>
+  <Trace enabled="Yes"/>
+ </TraceWindow>
+ <Watch1>
+  <Watches active="1" update="Never"/>
+ </Watch1>
+ <Watch2>
+  <Watches active="0" update="Never"/>
+ </Watch2>
+ <Watch3>
+  <Watches active="0" update="Never"/>
+ </Watch3>
+ <Watch4>
+  <Watches active="0" update="Never"/>
+ </Watch4>
+ <Files>
+  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="48" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../tinyusb/common/common.h" debugPath="../../../../tinyusb/common/common.h" selected="0" top="27" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="35" y="65" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../tinyusb/tusb_option.h" debugPath="../../../../tinyusb/tusb_option.h" selected="0" top="53" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="12" y="86" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../tinyusb/tusb_hal.h" debugPath="../../../../tinyusb/tusb_hal.h" selected="0" top="59" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="69" useTextEdit="1" useBinaryEdit="0" left="0" path="nrf.h" debugPath="nrf.h" selected="0" top="60" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="116" useTextEdit="1" useBinaryEdit="0" left="0" path="nRF/CMSIS/Device/Include/nrf52840.h" debugPath="nRF/CMSIS/Device/Include/nrf52840.h" selected="0" top="90" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="35" y="96" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/bsp/board.h" debugPath="../../../../hw/bsp/board.h" selected="0" top="85" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="30" y="122" useTextEdit="1" useBinaryEdit="0" left="0" path="../src/main.c" debugPath="../src/main.c" selected="0" top="96" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="18" y="60" useTextEdit="1" useBinaryEdit="0" left="0" path="../src/tusb_config.h" debugPath="../src/tusb_config.h" selected="0" top="54" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="25" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../tinyusb/tusb.c" debugPath="../../../../tinyusb/tusb.c" selected="0" top="16" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="1" y="69" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/mcu/nordic/nrf52/hal/hal_nrf52.c" debugPath="../../../../hw/mcu/nordic/nrf52/hal/hal_nrf52.c" selected="0" top="41" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="24" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/mcu/nordic/nrf52/sdk/drivers_nrf/hal/nrf_saadc.c" debugPath="../../../../hw/mcu/nordic/nrf52/sdk/drivers_nrf/hal/nrf_saadc.c" selected="0" top="12" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="30" y="55" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/mcu/nordic/nrf52/sdk/drivers_nrf/uart/nrf_drv_uart.c" debugPath="../../../../hw/mcu/nordic/nrf52/sdk/drivers_nrf/uart/nrf_drv_uart.c" selected="0" top="32" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="39" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/mcu/nordic/nrf52/sdk/drivers_nrf/systick/nrf_drv_systick.c" debugPath="../../../../hw/mcu/nordic/nrf52/sdk/drivers_nrf/systick/nrf_drv_systick.c" selected="0" top="8" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="65" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/mcu/nordic/nrf52/sdk/libraries/util/sdk_errors.h" debugPath="../../../../hw/mcu/nordic/nrf52/sdk/libraries/util/sdk_errors.h" selected="0" top="44" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="41" y="65" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/mcu/nordic/nrf52/sdk/libraries/experimental_log/nrf_log.h" debugPath="../../../../hw/mcu/nordic/nrf52/sdk/libraries/experimental_log/nrf_log.h" selected="0" top="47" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="9" y="781" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/mcu/nordic/nrf52/sdk/drivers_nrf/usbd/nrf_drv_usbd.c" debugPath="../../../../hw/mcu/nordic/nrf52/sdk/drivers_nrf/usbd/nrf_drv_usbd.c" selected="0" top="767" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="44" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/bsp/pca10056/board_pca10056.c" debugPath="../../../../hw/bsp/pca10056/board_pca10056.c" selected="0" top="27" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="54" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/mcu/nordic/nrf52/sdk/drivers_nrf/common/nrf_drv_common.c" debugPath="../../../../hw/mcu/nordic/nrf52/sdk/drivers_nrf/common/nrf_drv_common.c" selected="0" top="37" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="28" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/mcu/nordic/nrf52/sdk/sdk_config.h" debugPath="../../../../hw/mcu/nordic/nrf52/sdk/sdk_config.h" selected="0" top="0" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="33" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/mcu/nordic/nrf52/sdk/libraries/experimental_log/nrf_log_backend_interface.h" debugPath="../../../../hw/mcu/nordic/nrf52/sdk/libraries/experimental_log/nrf_log_backend_interface.h" selected="0" top="22" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="50" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/mcu/nordic/nrf52/sdk/libraries/experimental_memobj/nrf_memobj.h" debugPath="../../../../hw/mcu/nordic/nrf52/sdk/libraries/experimental_memobj/nrf_memobj.h" selected="0" top="25" codecName="Default"/>
+  <SessionOpenFile windowGroup="DockEditLeft" x="0" y="57" useTextEdit="1" useBinaryEdit="0" left="0" path="../../../../hw/mcu/nordic/nrf52/sdk/libraries/experimental_log/src/nrf_log_backend_serial.h" debugPath="../../../../hw/mcu/nordic/nrf52/sdk/libraries/experimental_log/src/nrf_log_backend_serial.h" selected="1" top="32" codecName="Default"/>
+ </Files>
+ <ARMCrossStudioWindow activeProject="nrf52840" fileDialogDefaultFilter="*.c" autoConnectTarget="J-Link" buildConfiguration="Debug" debugSearchFileMap="" fileDialogInitialDirectory="/home/hathach/Dropbox/tinyusb/workspace/tinyusb/hw/mcu/nordic/nrf52/hal" debugSearchPath="" autoConnectCapabilities="3711"/>
+</session>
--- a/examples/device/nrf52840/segger/nrf52840_Debug.jlink
+++ b/examples/device/nrf52840/segger/nrf52840_Debug.jlink
@ -0,0 +1,39 @@
+[BREAKPOINTS]
+ForceImpTypeAny = 0
+ShowInfoWin = 1
+EnableFlashBP = 2
+BPDuringExecution = 0
+[CFI]
+CFISize = 0x00
+CFIAddr = 0x00
+[CPU]
+MonModeVTableAddr = 0xFFFFFFFF
+MonModeDebug = 0
+MaxNumAPs = 0
+LowPowerHandlingMode = 0
+OverrideMemMap = 0
+AllowSimulation = 1
+ScriptFile=""
+[FLASH]
+CacheExcludeSize = 0x00
+CacheExcludeAddr = 0x00
+MinNumBytesFlashDL = 0
+SkipProgOnCRCMatch = 1
+VerifyDownload = 1
+AllowCaching = 1
+EnableFlashDL = 2
+Override = 0
+Device="ARM7"
+[GENERAL]
+WorkRAMSize = 0x00
+WorkRAMAddr = 0x00
+RAMUsageLimit = 0x00
+[SWO]
+SWOLogFile=""
+[MEM]
+RdOverrideOrMask = 0x00
+RdOverrideAndMask = 0xFFFFFFFF
+RdOverrideAddr = 0xFFFFFFFF
+WrOverrideOrMask = 0x00
+WrOverrideAndMask = 0xFFFFFFFF
+WrOverrideAddr = 0xFFFFFFFF
--- a/examples/device/nrf52840/segger/nrf52840_Registers.xml
+++ b/examples/device/nrf52840/segger/nrf52840_Registers.xml
--- a/examples/device/nrf52840/segger/ses_nRF_Startup.s
+++ b/examples/device/nrf52840/segger/ses_nRF_Startup.s
@ -0,0 +1,148 @@
+/*****************************************************************************
+ *                   SEGGER Microcontroller GmbH & Co. KG                    *
+ *            Solutions for real time microcontroller applications           *
+ *****************************************************************************
+ *                                                                           *
+ *               (c) 2017 SEGGER Microcontroller GmbH & Co. KG               *
+ *                                                                           *
+ *           Internet: www.segger.com   Support: support@segger.com          *
+ *                                                                           *
+ *****************************************************************************/
+
+/*****************************************************************************
+ *                         Preprocessor Definitions                          *
+ *                         ------------------------                          *
+ * NO_FPU_ENABLE                                                             *
+ *                                                                           *
+ *   If defined, FPU will not be enabled.                                    *
+ *                                                                           *
+ * NO_STACK_INIT                                                             *
+ *                                                                           *
+ *   If defined, the stack pointer will not be initialised.                  *
+ *                                                                           *
+ * NO_SYSTEM_INIT                                                            *
+ *                                                                           *
+ *   If defined, the SystemInit() function will not be called. By default    *
+ *   SystemInit() is called after reset to enable the clocks and memories to *
+ *   be initialised prior to any C startup initialisation.                   *
+ *                                                                           *
+ * NO_VTOR_CONFIG                                                            *
+ *                                                                           *
+ *   If defined, the vector table offset register will not be configured.    *
+ *                                                                           *
+ * MEMORY_INIT                                                               *
+ *                                                                           *
+ *   If defined, the MemoryInit() function will be called. By default        *
+ *   MemoryInit() is called after SystemInit() to enable an external memory  *
+ *   controller.                                                             *
+ *                                                                           *
+ * STACK_INIT_VAL                                                            *
+ *                                                                           *
+ *   If defined, specifies the initial stack pointer value. If undefined,    *
+ *   the stack pointer will be initialised to point to the end of the        *
+ *   RAM segment.                                                            *
+ *                                                                           *
+ * VECTORS_IN_RAM                                                            *
+ *                                                                           *
+ *   If defined, the exception vectors will be copied from Flash to RAM.     *
+ *                                                                           *
+ *****************************************************************************/
+
+  .syntax unified
+
+  .global Reset_Handler
+#ifdef INITIALIZE_USER_SECTIONS  
+  .global InitializeUserMemorySections
+#endif
+  .extern _vectors
+
+  .section .init, "ax"
+  .thumb_func
+
+  .equ VTOR_REG, 0xE000ED08
+  .equ FPU_CPACR_REG, 0xE000ED88
+
+#ifndef STACK_INIT_VAL
+#define STACK_INIT_VAL __RAM_segment_end__
+#endif
+
+Reset_Handler:
+#ifndef NO_STACK_INIT
+  /* Initialise main stack */
+  ldr r0, =STACK_INIT_VAL
+  ldr r1, =0x7
+  bics r0, r1
+  mov sp, r0
+#endif
+
+#ifndef NO_SYSTEM_INIT
+  /* Initialise system */
+  ldr r0, =SystemInit
+  blx r0
+#endif
+
+#ifdef MEMORY_INIT
+  ldr r0, =MemoryInit
+  blx r0
+#endif
+
+#ifdef VECTORS_IN_RAM
+  /* Copy exception vectors into RAM */
+  ldr r0, =__vectors_start__
+  ldr r1, =__vectors_end__
+  ldr r2, =__vectors_ram_start__
+1:
+  cmp r0, r1
+  beq 2f
+  ldr r3, [r0]
+  str r3, [r2]
+  adds r0, r0, #4
+  adds r2, r2, #4
+  b 1b
+2:
+#endif
+
+#ifndef NO_VTOR_CONFIG
+  /* Configure vector table offset register */
+  ldr r0, =VTOR_REG
+#ifdef VECTORS_IN_RAM
+  ldr r1, =_vectors_ram
+#else
+  ldr r1, =_vectors
+#endif
+  str r1, [r0]
+#endif
+
+#if (defined(__ARM_ARCH_FPV4_SP_D16__) || defined(__ARM_ARCH_FPV5_D16__)) && !defined(NO_FPU_ENABLE)
+  /* Enable FPU */
+  ldr r0, =FPU_CPACR_REG
+  ldr r1, [r0]
+  orr r1, r1, #(0xF << 20)
+  str r1, [r0]
+  dsb
+  isb
+#endif
+
+  /* Jump to program start */
+  b _start
+
+#ifdef INITIALIZE_USER_SECTIONS  
+  .thumb_func
+InitializeUserMemorySections:
+  ldr r0, =__start_nrf_sections
+  ldr r1, =__start_nrf_sections_run
+  ldr r2, =__end_nrf_sections_run
+  cmp r0, r1
+  beq 2f
+  subs r2, r2, r1
+  beq 2f
+1:
+  ldrb r3, [r0]
+  adds r0, r0, #1
+  strb r3, [r1]
+  adds r1, r1, #1
+  subs r2, r2, #1
+  bne 1b
+2:
+  bx lr
+#endif
--- a/examples/device/nrf52840/segger/ses_nrf52840_Vectors.s
+++ b/examples/device/nrf52840/segger/ses_nrf52840_Vectors.s
@ -0,0 +1,513 @@
+/*****************************************************************************
+ *                   SEGGER Microcontroller GmbH & Co. KG                    *
+ *            Solutions for real time microcontroller applications           *
+ *****************************************************************************
+ *                                                                           *
+ *               (c) 2017 SEGGER Microcontroller GmbH & Co. KG               *
+ *                                                                           *
+ *           Internet: www.segger.com   Support: support@segger.com          *
+ *                                                                           *
+ *****************************************************************************/
+
+/*****************************************************************************
+ *                         Preprocessor Definitions                          *
+ *                         ------------------------                          *
+ * VECTORS_IN_RAM                                                            *
+ *                                                                           *
+ *   If defined, an area of RAM will large enough to store the vector table  *
+ *   will be reserved.                                                       *
+ *                                                                           *
+ *****************************************************************************/
+
+  .syntax unified
+  .code 16
+
+  .section .init, "ax"
+  .align 0
+
+/*****************************************************************************
+ * Default Exception Handlers                                                *
+ *****************************************************************************/
+
+  .thumb_func
+  .weak NMI_Handler
+NMI_Handler:
+  b .
+
+  .thumb_func
+  .weak HardFault_Handler
+HardFault_Handler:
+  b .
+  
+  .thumb_func
+  .weak MemoryManagement_Handler
+MemoryManagement_Handler:
+  b .
+  
+  .thumb_func
+  .weak BusFault_Handler
+BusFault_Handler:
+  b .
+  
+  .thumb_func
+  .weak UsageFault_Handler
+UsageFault_Handler:
+  b .
+
+  .thumb_func
+  .weak SVC_Handler
+SVC_Handler:
+  b .
+  
+  .thumb_func
+  .weak DebugMon_Handler
+DebugMon_Handler:
+  b .
+
+  .thumb_func
+  .weak PendSV_Handler
+PendSV_Handler:
+  b .
+
+  .thumb_func
+  .weak SysTick_Handler
+SysTick_Handler:
+  b .
+
+  .thumb_func
+Dummy_Handler:
+  b .
+
+#if defined(__OPTIMIZATION_SMALL)
+
+  .weak POWER_CLOCK_IRQHandler
+  .thumb_set POWER_CLOCK_IRQHandler,Dummy_Handler
+
+  .weak RADIO_IRQHandler
+  .thumb_set RADIO_IRQHandler,Dummy_Handler
+
+  .weak UARTE0_UART0_IRQHandler
+  .thumb_set UARTE0_UART0_IRQHandler,Dummy_Handler
+
+  .weak SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0_IRQHandler
+  .thumb_set SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0_IRQHandler,Dummy_Handler
+
+  .weak SPIM1_SPIS1_TWIM1_TWIS1_SPI1_TWI1_IRQHandler
+  .thumb_set SPIM1_SPIS1_TWIM1_TWIS1_SPI1_TWI1_IRQHandler,Dummy_Handler
+
+  .weak NFCT_IRQHandler
+  .thumb_set NFCT_IRQHandler,Dummy_Handler
+
+  .weak GPIOTE_IRQHandler
+  .thumb_set GPIOTE_IRQHandler,Dummy_Handler
+
+  .weak SAADC_IRQHandler
+  .thumb_set SAADC_IRQHandler,Dummy_Handler
+
+  .weak TIMER0_IRQHandler
+  .thumb_set TIMER0_IRQHandler,Dummy_Handler
+
+  .weak TIMER1_IRQHandler
+  .thumb_set TIMER1_IRQHandler,Dummy_Handler
+
+  .weak TIMER2_IRQHandler
+  .thumb_set TIMER2_IRQHandler,Dummy_Handler
+
+  .weak RTC0_IRQHandler
+  .thumb_set RTC0_IRQHandler,Dummy_Handler
+
+  .weak TEMP_IRQHandler
+  .thumb_set TEMP_IRQHandler,Dummy_Handler
+
+  .weak RNG_IRQHandler
+  .thumb_set RNG_IRQHandler,Dummy_Handler
+
+  .weak ECB_IRQHandler
+  .thumb_set ECB_IRQHandler,Dummy_Handler
+
+  .weak CCM_AAR_IRQHandler
+  .thumb_set CCM_AAR_IRQHandler,Dummy_Handler
+
+  .weak WDT_IRQHandler
+  .thumb_set WDT_IRQHandler,Dummy_Handler
+
+  .weak RTC1_IRQHandler
+  .thumb_set RTC1_IRQHandler,Dummy_Handler
+
+  .weak QDEC_IRQHandler
+  .thumb_set QDEC_IRQHandler,Dummy_Handler
+
+  .weak COMP_LPCOMP_IRQHandler
+  .thumb_set COMP_LPCOMP_IRQHandler,Dummy_Handler
+
+  .weak SWI0_EGU0_IRQHandler
+  .thumb_set SWI0_EGU0_IRQHandler,Dummy_Handler
+
+  .weak SWI1_EGU1_IRQHandler
+  .thumb_set SWI1_EGU1_IRQHandler,Dummy_Handler
+
+  .weak SWI2_EGU2_IRQHandler
+  .thumb_set SWI2_EGU2_IRQHandler,Dummy_Handler
+
+  .weak SWI3_EGU3_IRQHandler
+  .thumb_set SWI3_EGU3_IRQHandler,Dummy_Handler
+
+  .weak SWI4_EGU4_IRQHandler
+  .thumb_set SWI4_EGU4_IRQHandler,Dummy_Handler
+
+  .weak SWI5_EGU5_IRQHandler
+  .thumb_set SWI5_EGU5_IRQHandler,Dummy_Handler
+
+  .weak TIMER3_IRQHandler
+  .thumb_set TIMER3_IRQHandler,Dummy_Handler
+
+  .weak TIMER4_IRQHandler
+  .thumb_set TIMER4_IRQHandler,Dummy_Handler
+
+  .weak PWM0_IRQHandler
+  .thumb_set PWM0_IRQHandler,Dummy_Handler
+
+  .weak PDM_IRQHandler
+  .thumb_set PDM_IRQHandler,Dummy_Handler
+
+  .weak MWU_IRQHandler
+  .thumb_set MWU_IRQHandler,Dummy_Handler
+
+  .weak PWM1_IRQHandler
+  .thumb_set PWM1_IRQHandler,Dummy_Handler
+
+  .weak PWM2_IRQHandler
+  .thumb_set PWM2_IRQHandler,Dummy_Handler
+
+  .weak SPIM2_SPIS2_SPI2_IRQHandler
+  .thumb_set SPIM2_SPIS2_SPI2_IRQHandler,Dummy_Handler
+
+  .weak RTC2_IRQHandler
+  .thumb_set RTC2_IRQHandler,Dummy_Handler
+
+  .weak I2S_IRQHandler
+  .thumb_set I2S_IRQHandler,Dummy_Handler
+
+  .weak FPU_IRQHandler
+  .thumb_set FPU_IRQHandler,Dummy_Handler
+
+  .weak USBD_IRQHandler
+  .thumb_set USBD_IRQHandler,Dummy_Handler
+
+  .weak UARTE1_IRQHandler
+  .thumb_set UARTE1_IRQHandler,Dummy_Handler
+
+  .weak QSPI_IRQHandler
+  .thumb_set QSPI_IRQHandler,Dummy_Handler
+
+  .weak CRYPTOCELL_IRQHandler
+  .thumb_set CRYPTOCELL_IRQHandler,Dummy_Handler
+
+  .weak SPIM3_IRQHandler
+  .thumb_set SPIM3_IRQHandler,Dummy_Handler
+
+  .weak PWM3_IRQHandler
+  .thumb_set PWM3_IRQHandler,Dummy_Handler
+
+#else
+
+  .thumb_func
+  .weak POWER_CLOCK_IRQHandler
+POWER_CLOCK_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak RADIO_IRQHandler
+RADIO_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak UARTE0_UART0_IRQHandler
+UARTE0_UART0_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0_IRQHandler
+SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak SPIM1_SPIS1_TWIM1_TWIS1_SPI1_TWI1_IRQHandler
+SPIM1_SPIS1_TWIM1_TWIS1_SPI1_TWI1_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak NFCT_IRQHandler
+NFCT_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak GPIOTE_IRQHandler
+GPIOTE_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak SAADC_IRQHandler
+SAADC_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak TIMER0_IRQHandler
+TIMER0_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak TIMER1_IRQHandler
+TIMER1_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak TIMER2_IRQHandler
+TIMER2_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak RTC0_IRQHandler
+RTC0_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak TEMP_IRQHandler
+TEMP_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak RNG_IRQHandler
+RNG_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak ECB_IRQHandler
+ECB_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak CCM_AAR_IRQHandler
+CCM_AAR_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak WDT_IRQHandler
+WDT_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak RTC1_IRQHandler
+RTC1_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak QDEC_IRQHandler
+QDEC_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak COMP_LPCOMP_IRQHandler
+COMP_LPCOMP_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak SWI0_EGU0_IRQHandler
+SWI0_EGU0_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak SWI1_EGU1_IRQHandler
+SWI1_EGU1_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak SWI2_EGU2_IRQHandler
+SWI2_EGU2_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak SWI3_EGU3_IRQHandler
+SWI3_EGU3_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak SWI4_EGU4_IRQHandler
+SWI4_EGU4_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak SWI5_EGU5_IRQHandler
+SWI5_EGU5_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak TIMER3_IRQHandler
+TIMER3_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak TIMER4_IRQHandler
+TIMER4_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak PWM0_IRQHandler
+PWM0_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak PDM_IRQHandler
+PDM_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak MWU_IRQHandler
+MWU_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak PWM1_IRQHandler
+PWM1_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak PWM2_IRQHandler
+PWM2_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak SPIM2_SPIS2_SPI2_IRQHandler
+SPIM2_SPIS2_SPI2_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak RTC2_IRQHandler
+RTC2_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak I2S_IRQHandler
+I2S_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak FPU_IRQHandler
+FPU_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak USBD_IRQHandler
+USBD_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak UARTE1_IRQHandler
+UARTE1_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak QSPI_IRQHandler
+QSPI_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak CRYPTOCELL_IRQHandler
+CRYPTOCELL_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak SPIM3_IRQHandler
+SPIM3_IRQHandler:
+  b .
+
+  .thumb_func
+  .weak PWM3_IRQHandler
+PWM3_IRQHandler:
+  b .
+
+#endif
+
+/*****************************************************************************
+ * Vector Table                                                              *
+ *****************************************************************************/
+
+  .section .vectors, "ax"
+  .align 0
+  .global _vectors
+  .extern __stack_end__
+  .extern Reset_Handler
+
+_vectors:
+  .word __stack_end__
+  .word Reset_Handler
+  .word NMI_Handler
+  .word HardFault_Handler
+  .word MemoryManagement_Handler
+  .word BusFault_Handler
+  .word UsageFault_Handler
+  .word 0 /* Reserved */
+  .word 0 /* Reserved */
+  .word 0 /* Reserved */
+  .word 0 /* Reserved */
+  .word SVC_Handler
+  .word DebugMon_Handler
+  .word 0 /* Reserved */
+  .word PendSV_Handler
+  .word SysTick_Handler
+  .word POWER_CLOCK_IRQHandler
+  .word RADIO_IRQHandler
+  .word UARTE0_UART0_IRQHandler
+  .word SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0_IRQHandler
+  .word SPIM1_SPIS1_TWIM1_TWIS1_SPI1_TWI1_IRQHandler
+  .word NFCT_IRQHandler
+  .word GPIOTE_IRQHandler
+  .word SAADC_IRQHandler
+  .word TIMER0_IRQHandler
+  .word TIMER1_IRQHandler
+  .word TIMER2_IRQHandler
+  .word RTC0_IRQHandler
+  .word TEMP_IRQHandler
+  .word RNG_IRQHandler
+  .word ECB_IRQHandler
+  .word CCM_AAR_IRQHandler
+  .word WDT_IRQHandler
+  .word RTC1_IRQHandler
+  .word QDEC_IRQHandler
+  .word COMP_LPCOMP_IRQHandler
+  .word SWI0_EGU0_IRQHandler
+  .word SWI1_EGU1_IRQHandler
+  .word SWI2_EGU2_IRQHandler
+  .word SWI3_EGU3_IRQHandler
+  .word SWI4_EGU4_IRQHandler
+  .word SWI5_EGU5_IRQHandler
+  .word TIMER3_IRQHandler
+  .word TIMER4_IRQHandler
+  .word PWM0_IRQHandler
+  .word PDM_IRQHandler
+  .word Dummy_Handler /* Reserved */
+  .word Dummy_Handler /* Reserved */
+  .word MWU_IRQHandler
+  .word PWM1_IRQHandler
+  .word PWM2_IRQHandler
+  .word SPIM2_SPIS2_SPI2_IRQHandler
+  .word RTC2_IRQHandler
+  .word I2S_IRQHandler
+  .word FPU_IRQHandler
+  .word USBD_IRQHandler
+  .word UARTE1_IRQHandler
+  .word QSPI_IRQHandler
+  .word CRYPTOCELL_IRQHandler
+  .word SPIM3_IRQHandler
+  .word Dummy_Handler /* Reserved */
+  .word PWM3_IRQHandler
+_vectors_end:
+
+#ifdef VECTORS_IN_RAM
+  .section .vectors_ram, "ax"
+  .align 0
+  .global _vectors_ram
+
+_vectors_ram:
+  .space _vectors_end - _vectors, 0
+#endif
--- a/examples/device/nrf52840/segger/system_nrf52840.c
+++ b/examples/device/nrf52840/segger/system_nrf52840.c
@ -0,0 +1,256 @@
+/*
+
+Copyright (c) 2009-2017 ARM Limited. All rights reserved.
+
+    SPDX-License-Identifier: Apache-2.0
+
+Licensed under the Apache License, Version 2.0 (the License); you may
+not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an AS IS BASIS, WITHOUT
+WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+NOTICE: This file has been modified by Nordic Semiconductor ASA.
+
+*/
+
+/* NOTE: Template files (including this one) are application specific and therefore expected to
+   be copied into the application project folder prior to its use! */
+   
+#include <stdint.h>
+#include <stdbool.h>
+#include "nrf.h"
+#include "system_nrf52840.h"
+
+/*lint ++flb "Enter library region" */
+
+#define __SYSTEM_CLOCK_64M      (64000000UL)
+
+static bool errata_36(void);
+static bool errata_66(void);
+static bool errata_98(void);
+static bool errata_103(void);
+static bool errata_115(void);
+static bool errata_120(void);
+static bool errata_136(void);
+
+
+#if defined ( __CC_ARM )
+    uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK_64M;
+#elif defined ( __ICCARM__ )
+    __root uint32_t SystemCoreClock = __SYSTEM_CLOCK_64M;
+#elif defined ( __GNUC__ )
+    uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK_64M;
+#endif
+
+void SystemCoreClockUpdate(void)
+{
+    SystemCoreClock = __SYSTEM_CLOCK_64M;
+}
+
+void SystemInit(void)
+{
+    /* Enable SWO trace functionality. If ENABLE_SWO is not defined, SWO pin will be used as GPIO (see Product
+       Specification to see which one). */
+    #if defined (ENABLE_SWO)
+        CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
+        NRF_CLOCK->TRACECONFIG |= CLOCK_TRACECONFIG_TRACEMUX_Serial << CLOCK_TRACECONFIG_TRACEMUX_Pos;
+        NRF_P1->PIN_CNF[0] = (GPIO_PIN_CNF_DRIVE_H0H1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
+    #endif
+
+    /* Enable Trace functionality. If ENABLE_TRACE is not defined, TRACE pins will be used as GPIOs (see Product
+       Specification to see which ones). */
+    #if defined (ENABLE_TRACE)
+        CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
+        NRF_CLOCK->TRACECONFIG |= CLOCK_TRACECONFIG_TRACEMUX_Parallel << CLOCK_TRACECONFIG_TRACEMUX_Pos;
+        NRF_P0->PIN_CNF[7]  = (GPIO_PIN_CNF_DRIVE_H0H1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
+        NRF_P1->PIN_CNF[0]  = (GPIO_PIN_CNF_DRIVE_H0H1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
+        NRF_P0->PIN_CNF[12] = (GPIO_PIN_CNF_DRIVE_H0H1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
+        NRF_P0->PIN_CNF[11] = (GPIO_PIN_CNF_DRIVE_H0H1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
+        NRF_P1->PIN_CNF[9]  = (GPIO_PIN_CNF_DRIVE_H0H1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
+    #endif
+    
+    /* Workaround for Errata 36 "CLOCK: Some registers are not reset when expected" found at the Errata document
+       for your device located at https://infocenter.nordicsemi.com/  */
+    if (errata_36()){
+        NRF_CLOCK->EVENTS_DONE = 0;
+        NRF_CLOCK->EVENTS_CTTO = 0;
+        NRF_CLOCK->CTIV = 0;
+    }
+    
+    /* Workaround for Errata 66 "TEMP: Linearity specification not met with default settings" found at the Errata document
+       for your device located at https://infocenter.nordicsemi.com/  */
+    if (errata_66()){
+        NRF_TEMP->A0 = NRF_FICR->TEMP.A0;
+        NRF_TEMP->A1 = NRF_FICR->TEMP.A1;
+        NRF_TEMP->A2 = NRF_FICR->TEMP.A2;
+        NRF_TEMP->A3 = NRF_FICR->TEMP.A3;
+        NRF_TEMP->A4 = NRF_FICR->TEMP.A4;
+        NRF_TEMP->A5 = NRF_FICR->TEMP.A5;
+        NRF_TEMP->B0 = NRF_FICR->TEMP.B0;
+        NRF_TEMP->B1 = NRF_FICR->TEMP.B1;
+        NRF_TEMP->B2 = NRF_FICR->TEMP.B2;
+        NRF_TEMP->B3 = NRF_FICR->TEMP.B3;
+        NRF_TEMP->B4 = NRF_FICR->TEMP.B4;
+        NRF_TEMP->B5 = NRF_FICR->TEMP.B5;
+        NRF_TEMP->T0 = NRF_FICR->TEMP.T0;
+        NRF_TEMP->T1 = NRF_FICR->TEMP.T1;
+        NRF_TEMP->T2 = NRF_FICR->TEMP.T2;
+        NRF_TEMP->T3 = NRF_FICR->TEMP.T3;
+        NRF_TEMP->T4 = NRF_FICR->TEMP.T4;
+    }
+    
+    /* Workaround for Errata 98 "NFCT: Not able to communicate with the peer" found at the Errata document
+       for your device located at https://infocenter.nordicsemi.com/  */
+    if (errata_98()){
+        *(volatile uint32_t *)0x4000568Cul = 0x00038148ul;
+    }
+    
+    /* Workaround for Errata 103 "CCM: Wrong reset value of CCM MAXPACKETSIZE" found at the Errata document
+       for your device located at https://infocenter.nordicsemi.com/  */
+    if (errata_103()){
+        NRF_CCM->MAXPACKETSIZE = 0xFBul;
+    }
+    
+    /* Workaround for Errata 115 "RAM: RAM content cannot be trusted upon waking up from System ON Idle or System OFF mode" found at the Errata document
+       for your device located at https://infocenter.nordicsemi.com/  */
+    if (errata_115()){
+        *(volatile uint32_t *)0x40000EE4 = (*(volatile uint32_t *)0x40000EE4 & 0xFFFFFFF0) | (*(uint32_t *)0x10000258 & 0x0000000F);
+    }
+    
+    /* Workaround for Errata 120 "QSPI: Data read or written is corrupted" found at the Errata document
+       for your device located at https://infocenter.nordicsemi.com/  */
+    if (errata_120()){
+        *(volatile uint32_t *)0x40029640ul = 0x200ul;
+    }
+    
+    /* Workaround for Errata 136 "System: Bits in RESETREAS are set when they should not be" found at the Errata document
+       for your device located at https://infocenter.nordicsemi.com/  */
+    if (errata_136()){
+        if (NRF_POWER->RESETREAS & POWER_RESETREAS_RESETPIN_Msk){
+            NRF_POWER->RESETREAS =  ~POWER_RESETREAS_RESETPIN_Msk;
+        }
+    }
+    
+    /* Enable the FPU if the compiler used floating point unit instructions. __FPU_USED is a MACRO defined by the
+     * compiler. Since the FPU consumes energy, remember to disable FPU use in the compiler if floating point unit
+     * operations are not used in your code. */
+    #if (__FPU_USED == 1)
+        SCB->CPACR |= (3UL << 20) | (3UL << 22);
+        __DSB();
+        __ISB();
+    #endif
+
+    /* Configure NFCT pins as GPIOs if NFCT is not to be used in your code. If CONFIG_NFCT_PINS_AS_GPIOS is not defined,
+       two GPIOs (see Product Specification to see which ones) will be reserved for NFC and will not be available as
+       normal GPIOs. */
+    #if defined (CONFIG_NFCT_PINS_AS_GPIOS)
+        if ((NRF_UICR->NFCPINS & UICR_NFCPINS_PROTECT_Msk) == (UICR_NFCPINS_PROTECT_NFC << UICR_NFCPINS_PROTECT_Pos)){
+            NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos;
+            while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
+            NRF_UICR->NFCPINS &= ~UICR_NFCPINS_PROTECT_Msk;
+            while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
+            NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos;
+            while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
+            NVIC_SystemReset();
+        }
+    #endif
+
+    /* Configure GPIO pads as pPin Reset pin if Pin Reset capabilities desired. If CONFIG_GPIO_AS_PINRESET is not
+      defined, pin reset will not be available. One GPIO (see Product Specification to see which one) will then be
+      reserved for PinReset and not available as normal GPIO. */
+    #if defined (CONFIG_GPIO_AS_PINRESET)
+        if (((NRF_UICR->PSELRESET[0] & UICR_PSELRESET_CONNECT_Msk) != (UICR_PSELRESET_CONNECT_Connected << UICR_PSELRESET_CONNECT_Pos)) ||
+            ((NRF_UICR->PSELRESET[1] & UICR_PSELRESET_CONNECT_Msk) != (UICR_PSELRESET_CONNECT_Connected << UICR_PSELRESET_CONNECT_Pos))){
+            NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos;
+            while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
+            NRF_UICR->PSELRESET[0] = 18;
+            while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
+            NRF_UICR->PSELRESET[1] = 18;
+            while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
+            NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos;
+            while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
+            NVIC_SystemReset();
+        }
+    #endif
+
+    SystemCoreClockUpdate();
+}
+
+
+static bool errata_36(void)
+{
+    if ((*(uint32_t *)0x10000130ul == 0x8ul) && (*(uint32_t *)0x10000134ul == 0x0ul)){
+        return true;
+    }
+    
+    return false;
+}
+
+
+static bool errata_66(void)
+{
+    if ((*(uint32_t *)0x10000130ul == 0x8ul) && (*(uint32_t *)0x10000134ul == 0x0ul)){
+        return true;
+    }
+    
+    return false;
+}
+
+
+static bool errata_98(void)
+{
+    if ((*(uint32_t *)0x10000130ul == 0x8ul) && (*(uint32_t *)0x10000134ul == 0x0ul)){
+        return true;
+    }
+    
+    return false;
+}
+
+
+static bool errata_103(void)
+{
+    if ((*(uint32_t *)0x10000130ul == 0x8ul) && (*(uint32_t *)0x10000134ul == 0x0ul)){
+        return true;
+    }
+    
+    return false;
+}
+
+
+static bool errata_115(void)
+{
+    if ((*(uint32_t *)0x10000130ul == 0x8ul) && (*(uint32_t *)0x10000134ul == 0x0ul)){
+        return true;
+    }
+    
+    return false;
+}
+
+
+static bool errata_120(void)
+{
+    if ((*(uint32_t *)0x10000130ul == 0x8ul) && (*(uint32_t *)0x10000134ul == 0x0ul)){
+        return true;
+    }
+    
+    return false;
+}
+
+
+static bool errata_136(void)
+{
+    if ((*(uint32_t *)0x10000130ul == 0x8ul) && (*(uint32_t *)0x10000134ul == 0x0ul)){
+        return true;
+    }
+    
+    return false;
+}
+
+/*lint --flb "Leave library region" */
--- a/examples/device/nrf52840/segger/thumb_crt0.s
+++ b/examples/device/nrf52840/segger/thumb_crt0.s
@ -0,0 +1,420 @@
+// SEGGER Embedded Studio, runtime support.
+//
+// Copyright (c) 2014-2017 SEGGER Microcontroller GmbH & Co KG
+// Copyright (c) 2001-2017 Rowley Associates Limited.
+//
+// This file may be distributed under the terms of the License Agreement
+// provided with this software.
+//
+// THIS FILE IS PROVIDED AS IS WITH NO WARRANTY OF ANY KIND, INCLUDING THE
+// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+//
+//
+//                           Preprocessor Definitions
+//                           ------------------------
+// APP_ENTRY_POINT
+//
+//   Defines the application entry point function, if undefined this setting
+//   defaults to "main".
+//
+// INITIALIZE_STACK
+//
+//   If defined, the contents of the stack will be initialized to a the
+//   value 0xCC.
+//
+// INITIALIZE_SECONDARY_SECTIONS
+//
+//   If defined, the .data2, .text2, .rodata2 and .bss2 sections will be initialized.
+//
+// INITIALIZE_TCM_SECTIONS
+//
+//   If defined, the .data_tcm, .text_tcm, .rodata_tcm and .bss_tcm sections 
+//   will be initialized.
+//
+// INITIALIZE_USER_SECTIONS
+//
+//   If defined, the function InitializeUserMemorySections will be called prior
+//   to entering main in order to allow the user to initialize any user defined
+//   memory sections.
+//
+// FULL_LIBRARY
+//
+//  If defined then 
+//    - argc, argv are setup by the debug_getargs.
+//    - the exit symbol is defined and executes on return from main.
+//    - the exit symbol calls destructors, atexit functions and then debug_exit.
+//  
+//  If not defined then
+//    - argc and argv are zero.
+//    - the exit symbol is defined, executes on return from main and loops
+//
+
+#ifndef APP_ENTRY_POINT
+#define APP_ENTRY_POINT main
+#endif
+
+#ifndef ARGSSPACE
+#define ARGSSPACE 128
+#endif
+  .syntax unified
+
+  .global _start
+  .extern APP_ENTRY_POINT
+  .global exit
+  .weak exit
+
+#ifdef INITIALIZE_USER_SECTIONS
+  .extern InitializeUserMemorySections
+#endif
+
+  .section .init, "ax"
+  .code 16
+  .align 2
+  .thumb_func
+
+_start:
+  /* Set up main stack if size > 0 */
+  ldr r1, =__stack_end__
+  ldr r0, =__stack_start__
+  subs r2, r1, r0
+  beq 1f
+#ifdef __ARM_EABI__
+  movs r2, #0x7
+  bics r1, r2
+#endif
+  mov sp, r1
+#ifdef INITIALIZE_STACK
+  movs r2, #0xCC
+  ldr r0, =__stack_start__
+  bl memory_set
+#endif
+1:
+
+  /* Set up process stack if size > 0 */
+  ldr r1, =__stack_process_end__
+  ldr r0, =__stack_process_start__
+  subs r2, r1, r0
+  beq 1f
+#ifdef __ARM_EABI__
+  movs r2, #0x7
+  bics r1, r2
+#endif
+  msr psp, r1
+  movs r2, #2
+  msr control, r2
+#ifdef INITIALIZE_STACK
+  movs r2, #0xCC
+  bl memory_set
+#endif
+1:
+
+  /* Copy initialized memory sections into RAM (if necessary). */
+  ldr r0, =__data_load_start__
+  ldr r1, =__data_start__
+  ldr r2, =__data_end__
+  bl memory_copy
+  ldr r0, =__text_load_start__
+  ldr r1, =__text_start__
+  ldr r2, =__text_end__
+  bl memory_copy
+  ldr r0, =__fast_load_start__
+  ldr r1, =__fast_start__
+  ldr r2, =__fast_end__
+  bl memory_copy
+  ldr r0, =__ctors_load_start__
+  ldr r1, =__ctors_start__
+  ldr r2, =__ctors_end__
+  bl memory_copy
+  ldr r0, =__dtors_load_start__
+  ldr r1, =__dtors_start__
+  ldr r2, =__dtors_end__
+  bl memory_copy
+  ldr r0, =__rodata_load_start__
+  ldr r1, =__rodata_start__
+  ldr r2, =__rodata_end__
+  bl memory_copy
+  ldr r0, =__tdata_load_start__
+  ldr r1, =__tdata_start__
+  ldr r2, =__tdata_end__
+  bl memory_copy
+#ifdef INITIALIZE_SECONDARY_SECTIONS
+  ldr r0, =__data2_load_start__
+  ldr r1, =__data2_start__
+  ldr r2, =__data2_end__
+  bl memory_copy
+  ldr r0, =__text2_load_start__
+  ldr r1, =__text2_start__
+  ldr r2, =__text2_end__
+  bl memory_copy
+  ldr r0, =__rodata2_load_start__
+  ldr r1, =__rodata2_start__
+  ldr r2, =__rodata2_end__
+  bl memory_copy
+#endif /* #ifdef INITIALIZE_SECONDARY_SECTIONS */
+#ifdef INITIALIZE_TCM_SECTIONS
+  ldr r0, =__data_tcm_load_start__
+  ldr r1, =__data_tcm_start__
+  ldr r2, =__data_tcm_end__
+  bl memory_copy
+  ldr r0, =__text_tcm_load_start__
+  ldr r1, =__text_tcm_start__
+  ldr r2, =__text_tcm_end__
+  bl memory_copy
+  ldr r0, =__rodata_tcm_load_start__
+  ldr r1, =__rodata_tcm_start__
+  ldr r2, =__rodata_tcm_end__
+  bl memory_copy
+#endif /* #ifdef INITIALIZE_TCM_SECTIONS */
+
+  /* Zero the bss. */
+  ldr r0, =__bss_start__
+  ldr r1, =__bss_end__
+  movs r2, #0
+  bl memory_set
+  ldr r0, =__tbss_start__
+  ldr r1, =__tbss_end__
+  movs r2, #0
+  bl memory_set
+#ifdef INITIALIZE_SECONDARY_SECTIONS
+  ldr r0, =__bss2_start__
+  ldr r1, =__bss2_end__
+  mov r2, #0
+  bl memory_set
+#endif /* #ifdef INITIALIZE_SECONDARY_SECTIONS */
+#ifdef INITIALIZE_TCM_SECTIONS
+  ldr r0, =__bss_tcm_start__
+  ldr r1, =__bss_tcm_end__
+  mov r2, #0
+  bl memory_set
+#endif /* #ifdef INITIALIZE_TCM_SECTIONS */
+
+  /* Initialize the heap */
+  ldr r0, = __heap_start__
+  ldr r1, = __heap_end__
+  subs r1, r1, r0
+  cmp r1, #8
+  blt 1f
+  movs r2, #0
+  str r2, [r0]
+  adds r0, r0, #4
+  str r1, [r0]
+1:
+
+#ifdef INITIALIZE_USER_SECTIONS
+  ldr r2, =InitializeUserMemorySections
+  blx r2
+#endif
+
+  /* Call constructors */
+  ldr r0, =__ctors_start__
+  ldr r1, =__ctors_end__
+ctor_loop:
+  cmp r0, r1
+  beq ctor_end
+  ldr r2, [r0]
+  adds r0, #4
+  push {r0-r1}  
+  blx r2
+  pop {r0-r1}
+  b ctor_loop
+ctor_end:
+
+  /* Setup initial call frame */
+  movs r0, #0
+  mov lr, r0
+  mov r12, sp
+
+  .type start, function
+start:
+  /* Jump to application entry point */
+#ifdef FULL_LIBRARY
+  movs r0, #ARGSSPACE
+  ldr r1, =args
+  ldr r2, =debug_getargs  
+  blx r2
+  ldr r1, =args
+#else
+  movs r0, #0
+  movs r1, #0
+#endif
+  ldr r2, =APP_ENTRY_POINT
+  blx r2
+
+  .thumb_func
+exit:
+#ifdef FULL_LIBRARY  
+  mov r5, r0 // save the exit parameter/return result
+
+  /* Call destructors */
+  ldr r0, =__dtors_start__
+  ldr r1, =__dtors_end__
+dtor_loop:
+  cmp r0, r1
+  beq dtor_end
+  ldr r2, [r0]
+  add r0, #4
+  push {r0-r1}
+  blx r2
+  pop {r0-r1}
+  b dtor_loop
+dtor_end:
+
+  /* Call atexit functions */
+  ldr r2, =_execute_at_exit_fns  
+  blx r2
+
+  /* Call debug_exit with return result/exit parameter */
+  mov r0, r5
+  ldr r2, =debug_exit  
+  blx r2
+#endif
+
+  /* Returned from application entry point, loop forever. */
+exit_loop:
+  b exit_loop
+
+  .thumb_func
+memory_copy:
+  cmp r0, r1
+  beq 2f
+  subs r2, r2, r1
+  beq 2f
+1:
+  ldrb r3, [r0]
+  adds r0, r0, #1
+  strb r3, [r1]
+  adds r1, r1, #1
+  subs r2, r2, #1
+  bne 1b
+2:
+  bx lr
+
+  .thumb_func
+memory_set:
+  cmp r0, r1
+  beq 1f
+  strb r2, [r0]
+  adds r0, r0, #1
+  b memory_set
+1:
+  bx lr
+
+  // default C/C++ library helpers
+
+.macro HELPER helper_name
+  .section .text.\helper_name, "ax", %progbits
+  .global \helper_name
+  .weak \helper_name  
+\helper_name:
+  .thumb_func
+.endm
+
+.macro JUMPTO name
+#if defined(__thumb__) && !defined(__thumb2__)
+  mov r12, r0
+  ldr r0, =\name
+  push {r0}
+  mov r0, r12
+  pop {pc}
+#else
+  b \name
+#endif
+.endm
+
+HELPER __aeabi_read_tp
+  ldr r0, =__tbss_start__-8
+  bx lr
+HELPER __heap_lock
+  bx lr
+HELPER __heap_unlock
+  bx lr
+HELPER __printf_lock
+  bx lr
+HELPER __printf_unlock
+  bx lr
+HELPER __scanf_lock
+  bx lr
+HELPER __scanf_unlock
+  bx lr
+HELPER __debug_io_lock
+  bx lr
+HELPER __debug_io_unlock
+  bx lr
+HELPER abort
+  b .
+HELPER __assert
+  b .
+HELPER __aeabi_assert
+  b .
+HELPER __cxa_pure_virtual
+  b .
+HELPER __cxa_guard_acquire
+  ldr r3, [r0]
+#if defined(__thumb__) && !defined(__thumb2__)
+  movs r0, #1
+  tst r3, r0
+#else
+  tst r3, #1
+#endif
+  beq 1f
+  movs r0, #0
+  bx lr
+1:
+  movs r0, #1
+  bx lr
+HELPER __cxa_guard_release
+  movs r3, #1
+  str r3, [r0]
+  bx lr
+HELPER __cxa_guard_abort
+  bx lr
+HELPER __sync_synchronize
+  bx lr
+HELPER __getchar
+  JUMPTO debug_getchar
+HELPER __putchar
+  JUMPTO debug_putchar
+HELPER __open
+  JUMPTO debug_fopen
+HELPER __close
+  JUMPTO debug_fclose
+HELPER __write   
+  mov r3, r0
+  mov r0, r1
+  movs r1, #1  
+  JUMPTO debug_fwrite
+HELPER __read  
+  mov r3, r0
+  mov r0, r1
+  movs r1, #1 
+  JUMPTO debug_fread
+HELPER __seek
+  push {r4, lr}
+  mov r4, r0
+  bl debug_fseek
+  cmp r0, #0
+  bne 1f
+  mov r0, r4
+  bl debug_ftell
+  pop {r4, pc}
+1:
+  ldr r0, =-1
+  pop {r4, pc}
+  // char __user_locale_name_buffer[];
+  .section .bss.__user_locale_name_buffer, "aw", %nobits
+  .global __user_locale_name_buffer
+  .weak __user_locale_name_buffer
+  __user_locale_name_buffer:
+  .word 0x0
+
+#ifdef FULL_LIBRARY
+  .bss
+args:
+  .space ARGSSPACE
+#endif
+
+  /* Setup attibutes of stack and heap sections so they don't take up room in the elf file */
+  .section .stack, "wa", %nobits
+  .section .stack_process, "wa", %nobits
+  .section .heap, "wa", %nobits
+
--- a/examples/device/nrf52840/src/main.c
+++ b/examples/device/nrf52840/src/main.c
@ -0,0 +1,152 @@
+/**************************************************************************/
+/*!
+    @file     main.c
+    @author   hathach (tinyusb.org)
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2013, hathach (tinyusb.org)
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION HOWEVER CAUSED AND
+    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    INCLUDING NEGLIGENCE OR OTHERWISE ARISING IN ANY WAY OUT OF THE USE OF THIS
+    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+    This file is part of the tinyusb stack.
+*/
+/**************************************************************************/
+
+//--------------------------------------------------------------------+
+// INCLUDE
+//--------------------------------------------------------------------+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "bsp/board.h"
+#include "tusb.h"
+
+//--------------------------------------------------------------------+
+// MACRO CONSTANT TYPEDEF
+//--------------------------------------------------------------------+
+
+//--------------------------------------------------------------------+
+// INTERNAL OBJECT & FUNCTION DECLARATION
+//--------------------------------------------------------------------+
+void print_greeting(void);
+void led_blinking_task(void);
+void virtual_com_task(void);
+
+/*------------- MAIN -------------*/
+int main(void)
+{
+  board_init();
+  print_greeting();
+
+  //tusb_init();
+
+  while (1)
+  {
+    //tusb_task();
+
+    led_blinking_task();
+    //virtual_com_task();
+  }
+
+  return 0;
+}
+
+void virtual_com_task(void)
+{
+  // connected and there are data available
+  if ( tud_mounted(0) && tud_cdc_available(0) )
+  {
+    uint8_t buf[64];
+
+    // read and echo back
+    uint32_t count = tud_cdc_read(0, buf, sizeof(buf));
+
+    tud_cdc_write(0, buf, count);
+  }
+}
+
+
+//--------------------------------------------------------------------+
+// tinyusb callbacks
+//--------------------------------------------------------------------+
+void tud_mount_cb(uint8_t port)
+{
+
+}
+
+void tud_umount_cb(uint8_t port)
+{
+}
+
+void tud_cdc_rx_cb(uint8_t port)
+{
+}
+
+//--------------------------------------------------------------------+
+// BLINKING TASK
+//--------------------------------------------------------------------+
+void led_blinking_task(void)
+{
+  enum { BLINK_INTEVAL = 1000 };
+
+  static uint32_t led_on_mask = 0;
+  static uint32_t last_blink = 0;
+
+  // not enough time
+  if ( last_blink + BLINK_INTEVAL > hal_tick_get() ) return;
+
+  last_blink += BLINK_INTEVAL;
+
+  board_leds(led_on_mask, 1 - led_on_mask);
+  led_on_mask = 1 - led_on_mask; // toggle
+}
+
+//--------------------------------------------------------------------+
+// HELPER FUNCTION
+//--------------------------------------------------------------------+
+void print_greeting(void)
+{
+  char const * const rtos_name[] =
+  {
+      [TUSB_OS_NONE]      = "None",
+      [TUSB_OS_FREERTOS]  = "FreeRTOS",
+  };
+
+  printf("\n--------------------------------------------------------------------\n");
+  printf("-                     Device Demo (a tinyusb example)\n");
+  printf("- if you find any bugs or get any questions, feel free to file an\n");
+  printf("- issue at https://github.com/hathach/tinyusb\n");
+  printf("--------------------------------------------------------------------\n\n");
+
+  printf("This DEVICE demo is configured to support:");
+  printf("  - RTOS = %s\n", rtos_name[TUSB_CFG_OS]);
+  if (TUSB_CFG_DEVICE_HID_MOUSE    ) puts("  - HID Mouse");
+  if (TUSB_CFG_DEVICE_HID_KEYBOARD ) puts("  - HID Keyboard");
+  if (TUSB_CFG_DEVICE_MSC          ) puts("  - Mass Storage");
+  if (TUSB_CFG_DEVICE_CDC          ) puts("  - Communication Device Class");
+}
--- a/examples/device/nrf52840/src/tusb_config.h
+++ b/examples/device/nrf52840/src/tusb_config.h
@ -0,0 +1,86 @@
+/**************************************************************************/
+/*!
+    @file     tusb_config.h
+    @author   hathach (tinyusb.org)
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2013, hathach (tinyusb.org)
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION HOWEVER CAUSED AND
+    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    INCLUDING NEGLIGENCE OR OTHERWISE ARISING IN ANY WAY OUT OF THE USE OF THIS
+    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+    This file is part of the tinyusb stack.
+*/
+/**************************************************************************/
+
+#ifndef _TUSB_TUSB_CONFIG_H_
+#define _TUSB_TUSB_CONFIG_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+//--------------------------------------------------------------------+
+// CONTROLLER CONFIGURATION
+//--------------------------------------------------------------------+
+//#define TUSB_CFG_MCU will be passed from IDE/command line for easy board/mcu switching
+
+#define TUSB_CFG_CONTROLLER_0_MODE  (TUSB_MODE_DEVICE)
+//#define TUSB_CFG_CONTROLLER_1_MODE  (TUSB_MODE_DEVICE)
+
+//--------------------------------------------------------------------+
+// DEVICE CONFIGURATION
+//--------------------------------------------------------------------+
+#define TUSB_CFG_DEVICE_CONTROL_ENDOINT_SIZE    64
+
+//------------- CLASS -------------//
+#define TUSB_CFG_DEVICE_HID_KEYBOARD            0
+#define TUSB_CFG_DEVICE_HID_MOUSE               0
+#define TUSB_CFG_DEVICE_HID_GENERIC             0 // not supported yet
+#define TUSB_CFG_DEVICE_MSC                     0
+#define TUSB_CFG_DEVICE_CDC                     1
+
+//--------------------------------------------------------------------+
+// COMMON CONFIGURATION
+//--------------------------------------------------------------------+
+#define TUSB_CFG_DEBUG                2
+
+#define TUSB_CFG_OS                   TUSB_OS_NONE // be passed from IDE/command line for easy project switching
+//#define TUSB_CFG_OS_TASK_PRIO         0            // be passed from IDE/command line for easy project switching
+#define TUSB_CFG_TICKS_HZ             1000
+
+//#define TUSB_CFG_OS       TUSB_OS_NONE
+
+//--------------------------------------------------------------------+
+// USB RAM PLACEMENT
+//--------------------------------------------------------------------+
+#define TUSB_CFG_ATTR_USBRAM
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* _TUSB_TUSB_CONFIG_H_ */
--- a/examples/device/nrf52840/src/tusb_descriptors.c
+++ b/examples/device/nrf52840/src/tusb_descriptors.c
@ -0,0 +1,256 @@
+/**************************************************************************/
+/*!
+    @file     tusb_descriptors.c
+    @author   hathach (tinyusb.org)
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2013, hathach (tinyusb.org)
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION HOWEVER CAUSED AND
+    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    INCLUDING NEGLIGENCE OR OTHERWISE ARISING IN ANY WAY OUT OF THE USE OF THIS
+    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+    This file is part of the tinyusb stack.
+*/
+/**************************************************************************/
+
+#include "tusb_descriptors.h"
+
+//--------------------------------------------------------------------+
+// USB DEVICE DESCRIPTOR
+//--------------------------------------------------------------------+
+tusb_descriptor_device_t const desc_device =
+{
+    .bLength            = sizeof(tusb_descriptor_device_t),
+    .bDescriptorType    = TUSB_DESC_TYPE_DEVICE,
+    .bcdUSB             = 0x0200,
+
+    // Use Interface Association Descriptor (IAD) for CDC
+    // As required by USB Specs IAD's subclass must be common class (2) and protocol must be IAD (1)
+    .bDeviceClass       = TUSB_CLASS_MISC,
+    .bDeviceSubClass    = MISC_SUBCLASS_COMMON,
+    .bDeviceProtocol    = MISC_PROTOCOL_IAD,
+
+    .bMaxPacketSize0    = TUSB_CFG_DEVICE_CONTROL_ENDOINT_SIZE,
+
+    .idVendor           = CFG_VENDORID,
+    .idProduct          = CFG_PRODUCTID,
+    .bcdDevice          = 0x0100,
+
+    .iManufacturer      = 0x01,
+    .iProduct           = 0x02,
+    .iSerialNumber      = 0x03,
+
+    .bNumConfigurations = 0x01
+};
+
+//--------------------------------------------------------------------+
+// USB COFNIGURATION DESCRIPTOR
+//--------------------------------------------------------------------+
+app_descriptor_configuration_t const desc_configuration =
+{
+    .configuration =
+    {
+        .bLength             = sizeof(tusb_descriptor_configuration_t),
+        .bDescriptorType     = TUSB_DESC_TYPE_CONFIGURATION,
+
+        .wTotalLength        = sizeof(app_descriptor_configuration_t),
+        .bNumInterfaces      = TOTAL_INTEFACES,
+
+        .bConfigurationValue = 1,
+        .iConfiguration      = 0x00,
+        .bmAttributes        = TUSB_DESC_CONFIG_ATT_BUS_POWER,
+        .bMaxPower           = TUSB_DESC_CONFIG_POWER_MA(500)
+    },
+
+    // IAD points to CDC Interfaces
+    .cdc_iad =
+    {
+        .bLength           = sizeof(tusb_descriptor_interface_association_t),
+        .bDescriptorType   = TUSB_DESC_TYPE_INTERFACE_ASSOCIATION,
+
+        .bFirstInterface   = INTERFACE_NO_CDC,
+        .bInterfaceCount   = 2,
+
+        .bFunctionClass    = TUSB_CLASS_CDC,
+        .bFunctionSubClass = CDC_COMM_SUBCLASS_ABSTRACT_CONTROL_MODEL,
+        .bFunctionProtocol = CDC_COMM_PROTOCOL_ATCOMMAND,
+        .iFunction         = 0
+    },
+
+    //------------- CDC Communication Interface -------------//
+    .cdc_comm_interface =
+    {
+        .bLength            = sizeof(tusb_descriptor_interface_t),
+        .bDescriptorType    = TUSB_DESC_TYPE_INTERFACE,
+        .bInterfaceNumber   = INTERFACE_NO_CDC,
+        .bAlternateSetting  = 0,
+        .bNumEndpoints      = 1,
+        .bInterfaceClass    = TUSB_CLASS_CDC,
+        .bInterfaceSubClass = CDC_COMM_SUBCLASS_ABSTRACT_CONTROL_MODEL,
+        .bInterfaceProtocol = CDC_COMM_PROTOCOL_ATCOMMAND,
+        .iInterface         = 0x00
+    },
+
+    .cdc_header =
+    {
+        .bLength            = sizeof(cdc_desc_func_header_t),
+        .bDescriptorType    = TUSB_DESC_TYPE_INTERFACE_CLASS_SPECIFIC,
+        .bDescriptorSubType = CDC_FUNC_DESC_HEADER,
+        .bcdCDC             = 0x0120
+    },
+
+    .cdc_call =
+    {
+        .bLength            = sizeof(cdc_desc_func_call_management_t),
+        .bDescriptorType    = TUSB_DESC_TYPE_INTERFACE_CLASS_SPECIFIC,
+        .bDescriptorSubType = CDC_FUNC_DESC_CALL_MANAGEMENT,
+        .bmCapabilities     = { 0 },
+        .bDataInterface     = INTERFACE_NO_CDC+1,
+    },
+
+    .cdc_acm =
+    {
+        .bLength            = sizeof(cdc_desc_func_abstract_control_management_t),
+        .bDescriptorType    = TUSB_DESC_TYPE_INTERFACE_CLASS_SPECIFIC,
+        .bDescriptorSubType = CDC_FUNC_DESC_ABSTRACT_CONTROL_MANAGEMENT,
+        .bmCapabilities     = { // 0x02
+            .support_line_request = 1,
+        }
+    },
+
+    .cdc_union =
+    {
+        .bLength                  = sizeof(cdc_desc_func_union_t), // plus number of
+        .bDescriptorType          = TUSB_DESC_TYPE_INTERFACE_CLASS_SPECIFIC,
+        .bDescriptorSubType       = CDC_FUNC_DESC_UNION,
+        .bControlInterface        = INTERFACE_NO_CDC,
+        .bSubordinateInterface    = INTERFACE_NO_CDC+1,
+    },
+
+    .cdc_endpoint_notification =
+    {
+        .bLength          = sizeof(tusb_descriptor_endpoint_t),
+        .bDescriptorType  = TUSB_DESC_TYPE_ENDPOINT,
+        .bEndpointAddress = CDC_EDPT_NOTIFICATION_ADDR,
+        .bmAttributes     = { .xfer = TUSB_XFER_INTERRUPT },
+        .wMaxPacketSize   = { .size = 0x08 },
+        .bInterval        = 0x10
+    },
+
+    //------------- CDC Data Interface -------------//
+    .cdc_data_interface =
+    {
+        .bLength            = sizeof(tusb_descriptor_interface_t),
+        .bDescriptorType    = TUSB_DESC_TYPE_INTERFACE,
+        .bInterfaceNumber   = INTERFACE_NO_CDC+1,
+        .bAlternateSetting  = 0x00,
+        .bNumEndpoints      = 2,
+        .bInterfaceClass    = TUSB_CLASS_CDC_DATA,
+        .bInterfaceSubClass = 0,
+        .bInterfaceProtocol = 0,
+        .iInterface         = 0x00
+    },
+
+    .cdc_endpoint_out =
+    {
+        .bLength          = sizeof(tusb_descriptor_endpoint_t),
+        .bDescriptorType  = TUSB_DESC_TYPE_ENDPOINT,
+        .bEndpointAddress = CDC_EDPT_DATA_OUT_ADDR,
+        .bmAttributes     = { .xfer = TUSB_XFER_BULK },
+        .wMaxPacketSize   = { .size = CDC_EDPT_DATA_PACKETSIZE },
+        .bInterval        = 0
+    },
+
+    .cdc_endpoint_in =
+    {
+        .bLength          = sizeof(tusb_descriptor_endpoint_t),
+        .bDescriptorType  = TUSB_DESC_TYPE_ENDPOINT,
+        .bEndpointAddress = CDC_EDPT_DATA_IN_ADDR,
+        .bmAttributes     = { .xfer = TUSB_XFER_BULK },
+        .wMaxPacketSize   = { .size = CDC_EDPT_DATA_PACKETSIZE },
+        .bInterval        = 0
+    },
+};
+
+//--------------------------------------------------------------------+
+// STRING DESCRIPTORS
+//--------------------------------------------------------------------+
+#define STRING_LEN_UNICODE(n) (2 + (2*(n))) // also includes 2 byte header
+#define ENDIAN_BE16_FROM( high, low) ENDIAN_BE16(high << 8 | low)
+
+// array of pointer to string descriptors
+uint16_t const * const string_descriptor_arr [] =
+{
+    [0] = (uint16_t []) { // supported language
+        ENDIAN_BE16_FROM( STRING_LEN_UNICODE(1), TUSB_DESC_TYPE_STRING ),
+        0x0409 // English
+    },
+
+    [1] = (uint16_t []) { // manufacturer
+        ENDIAN_BE16_FROM( STRING_LEN_UNICODE(11), TUSB_DESC_TYPE_STRING),
+        't', 'i', 'n', 'y', 'u', 's', 'b', '.', 'o', 'r', 'g' // len = 11
+    },
+
+    [2] = (uint16_t []) { // product
+        ENDIAN_BE16_FROM( STRING_LEN_UNICODE(14), TUSB_DESC_TYPE_STRING),
+        't', 'i', 'n', 'y', 'u', 's', 'b', ' ', 'd', 'e', 'v', 'i', 'c', 'e' // len = 14
+    },
+
+    [3] = (uint16_t []) { // serials
+        ENDIAN_BE16_FROM( STRING_LEN_UNICODE(4), TUSB_DESC_TYPE_STRING),
+        '1', '2', '3', '4' // len = 4
+    },
+
+    [4] = (uint16_t []) { // CDC Interface
+        ENDIAN_BE16_FROM( STRING_LEN_UNICODE(3), TUSB_DESC_TYPE_STRING),
+        'c', 'd', 'c' // len = 3
+    },
+
+    [5] = (uint16_t []) { // Keyboard Interface
+        ENDIAN_BE16_FROM( STRING_LEN_UNICODE(5), TUSB_DESC_TYPE_STRING),
+        'm', 'o', 'u', 's', 'e' // len = 5
+    },
+
+    [6] = (uint16_t []) { // Keyboard Interface
+        ENDIAN_BE16_FROM( STRING_LEN_UNICODE(8), TUSB_DESC_TYPE_STRING),
+        'k', 'e', 'y', 'b', 'o', 'a', 'r', 'd' // len = 8
+    },
+
+    [7] = (uint16_t []) { // MSC Interface
+        ENDIAN_BE16_FROM( STRING_LEN_UNICODE(3), TUSB_DESC_TYPE_STRING),
+        'm', 's', 'c' // len = 3
+    }
+};
+
+//--------------------------------------------------------------------+
+// TINYUSB Descriptors Pointer (this variable is required by the stack)
+//--------------------------------------------------------------------+
+tusbd_descriptor_pointer_t tusbd_descriptor_pointers =
+{
+    .p_device              = (uint8_t const * ) &desc_device,
+    .p_configuration       = (uint8_t const * ) &desc_configuration,
+    .p_string_arr          = (uint8_t const **) string_descriptor_arr,
+};
--- a/examples/device/nrf52840/src/tusb_descriptors.h
+++ b/examples/device/nrf52840/src/tusb_descriptors.h
@ -0,0 +1,101 @@
+/**************************************************************************/
+/*!
+    @file     tusb_descriptors.h
+    @author   hathach (tinyusb.org)
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2013, hathach (tinyusb.org)
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION HOWEVER CAUSED AND
+    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    INCLUDING NEGLIGENCE OR OTHERWISE ARISING IN ANY WAY OUT OF THE USE OF THIS
+    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+    This file is part of the tinyusb stack.
+*/
+/**************************************************************************/
+
+#ifndef _TUSB_DESCRIPTORS_H_
+#define _TUSB_DESCRIPTORS_H_
+
+#include "tusb.h"
+
+//--------------------------------------------------------------------+
+// Descriptors Value (calculated by enabled Classes)
+//--------------------------------------------------------------------+
+#define CFG_VENDORID            0xCAFE
+//#define CFG_PRODUCTID           0x4567 // use auto product id to prevent conflict with pc's driver
+
+// each combination of interfaces need to have a unique productid, as windows will bind & remember device driver after the first plug.
+// Auto ProductID layout's Bitmap: (MSB) MassStorage | Generic | Mouse | Key | CDC (LSB)
+#ifndef CFG_PRODUCTID
+  #define PRODUCTID_BITMAP(interface, n)  ( (TUSB_CFG_DEVICE_##interface) << (n) )
+  #define CFG_PRODUCTID                   (0x4000 | ( PRODUCTID_BITMAP(CDC, 0) | PRODUCTID_BITMAP(HID_KEYBOARD, 1) | \
+                                           PRODUCTID_BITMAP(HID_MOUSE, 2) | PRODUCTID_BITMAP(HID_GENERIC, 3) | \
+                                           PRODUCTID_BITMAP(MSC, 4) ) )
+#endif
+
+#define INTERFACE_NO_CDC          0
+#define TOTAL_INTEFACES           2
+
+//--------------------------------------------------------------------+
+// Endpoints Address & Max Packet Size
+//--------------------------------------------------------------------+
+#define EDPT_IN(x)    (0x80 | (x))
+#define EDPT_OUT(x)   (x)
+
+#define CDC_EDPT_NOTIFICATION_ADDR            EDPT_IN (1)
+#define CDC_EDPT_NOTIFICATION_PACKETSIZE      64
+
+#define CDC_EDPT_DATA_OUT_ADDR                EDPT_OUT(2)
+#define CDC_EDPT_DATA_IN_ADDR                 EDPT_IN (2)
+#define CDC_EDPT_DATA_PACKETSIZE              64
+
+
+//--------------------------------------------------------------------+
+// CONFIGURATION DESCRIPTOR
+//--------------------------------------------------------------------+
+typedef struct ATTR_PACKED
+{
+  tusb_descriptor_configuration_t              configuration;
+
+  //------------- CDC -------------//
+  tusb_descriptor_interface_association_t      cdc_iad;
+
+  //CDC Control Interface
+  tusb_descriptor_interface_t                  cdc_comm_interface;
+  cdc_desc_func_header_t                       cdc_header;
+  cdc_desc_func_call_management_t              cdc_call;
+  cdc_desc_func_abstract_control_management_t  cdc_acm;
+  cdc_desc_func_union_t                        cdc_union;
+  tusb_descriptor_endpoint_t                   cdc_endpoint_notification;
+
+  //CDC Data Interface
+  tusb_descriptor_interface_t                  cdc_data_interface;
+  tusb_descriptor_endpoint_t                   cdc_endpoint_out;
+  tusb_descriptor_endpoint_t                   cdc_endpoint_in;
+
+} app_descriptor_configuration_t;
+
+#endif
--- a/hw/bsp/board.h
+++ b/hw/bsp/board.h
@ -110,6 +110,8 @@
  #include "microbuilder/board_lpc4357usb.h"
 #elif BOARD == BOARD_LPCLINK2
 #include "lpcxpresso/board_lpclink2.h"
+#elif defined BOARD_PCA10056
+ #include "pca10056/board_pca10056.h"
 #else
  #error BOARD is not defined or supported yet
 #endif
--- a/hw/bsp/pca10056/board_pca10056.c
+++ b/hw/bsp/pca10056/board_pca10056.c
@ -0,0 +1,89 @@
+/**************************************************************************/
+/*!
+    @file     board_pca10056.c
+    @author   hathach
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2018, hathach (tinyusb.org)
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/**************************************************************************/
+
+#include "board_pca10056.h"
+#include "nrf_gpio.h"
+#include "nrf_drv_systick.h"
+
+/*------------------------------------------------------------------*/
+/* MACRO TYPEDEF CONSTANT ENUM
+ *------------------------------------------------------------------*/
+#define LED_1           13
+#define LED_STATE_ON    0
+
+
+/*------------------------------------------------------------------*/
+/* VARIABLE DECLARATION
+ *------------------------------------------------------------------*/
+
+/*------------------------------------------------------------------*/
+/* FUNCTION DECLARATION
+ *------------------------------------------------------------------*/
+void board_init(void)
+{
+  nrf_gpio_cfg_output(LED_1);
+
+  SysTick_Config(SystemCoreClock/1000);
+  NVIC_EnableIRQ(SysTick_IRQn);
+}
+
+void board_leds(uint32_t on_mask, uint32_t off_mask)
+{
+  if (on_mask)
+  {
+    nrf_gpio_pin_write(LED_1, LED_STATE_ON);
+  }
+
+  if ( off_mask)
+  {
+    nrf_gpio_pin_write(LED_1, 1-LED_STATE_ON);
+  }
+}
+
+uint32_t board_buttons(void)
+{
+  return 0;
+}
+
+uint8_t  board_uart_getchar(void)
+{
+  return 0;
+}
+
+void board_uart_putchar(uint8_t c)
+{
+
+}
--- a/hw/bsp/pca10056/board_pca10056.h
+++ b/hw/bsp/pca10056/board_pca10056.h
@ -0,0 +1,50 @@
+/**************************************************************************/
+/*!
+    @file     board_pca10056.h
+    @author   hathach
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2018, hathach (tinyusb.org)
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/**************************************************************************/
+#ifndef BOARD_PCA10056_H_
+#define BOARD_PCA10056_H_
+
+#include "nrf.h"
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_PCA10056_H_ */
--- a/hw/mcu/nordic/nrf52/hal/hal_nrf52.c
+++ b/hw/mcu/nordic/nrf52/hal/hal_nrf52.c
@ -0,0 +1,98 @@
+/**************************************************************************/
+/*!
+    @file     hal_nrf52.c
+    @author   hathach
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2018, hathach (tinyusb.org)
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/**************************************************************************/
+
+#include <stdbool.h>
+#include "nrf.h"
+#include "nrf_gpio.h"
+#include "nrf_drv_systick.h"
+
+/*------------------------------------------------------------------*/
+/* MACRO TYPEDEF CONSTANT ENUM
+ *------------------------------------------------------------------*/
+
+
+/*------------------------------------------------------------------*/
+/* VARIABLE DECLARATION
+ *------------------------------------------------------------------*/
+
+/*------------------------------------------------------------------*/
+/* FUNCTION DECLARATION
+ *------------------------------------------------------------------*/
+
+volatile uint32_t system_ticks = 0;
+
+void SysTick_Handler (void)
+{
+  system_ticks++;
+}
+
+
+bool hal_usb_init(void)
+{
+
+}
+
+void hal_usb_int_enable(uint8_t port)
+{
+  (void) port;
+  NVIC_EnableIRQ(USBD_IRQn);
+}
+
+void hal_usb_int_disable(uint8_t port)
+{
+  (void) port;
+  NVIC_DisableIRQ(USBD_IRQn);
+}
+
+uint32_t hal_tick_get(void)
+{
+  //#define tick2ms(tck)         ( ( ((uint64_t)(tck)) * 1000) / configTICK_RATE_HZ )
+  //return tick2ms( app_timer_cnt_get() );
+
+  return system_ticks;
+}
+
+void hal_debugger_breakpoint(void)
+{
+  // M0 cannot check if debugger is attached or not
+#if defined(__CORTEX_M) && (__CORTEX_M > 0)
+  // check if debugger is attached
+  if ( (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) == CoreDebug_DHCSR_C_DEBUGEN_Msk)
+  {
+    __asm("BKPT #0\n");
+  }
+#endif
+}
--- a/tinyusb/osal/osal_none.h
+++ b/tinyusb/osal/osal_none.h
@ -53,7 +53,6 @@
 //--------------------------------------------------------------------+
 // TICK API
 //--------------------------------------------------------------------+
-uint32_t hal_tick_get(void);
 #define osal_tick_get hal_tick_get

 //--------------------------------------------------------------------+
--- a/tinyusb/tusb_hal.h
+++ b/tinyusb/tusb_hal.h
@ -84,6 +84,8 @@ void hal_usb_int_enable(uint8_t port);
 */
 void hal_usb_int_disable(uint8_t port);

+uint32_t hal_tick_get(void);
+
 // for debug only, halt mcu if assert/verify is failed if debugger is attached
 void hal_debugger_breakpoint(void);