diff --git a/.gitignore b/.gitignore
index 772f5d8e..ea08146b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,7 +11,7 @@ latex
 *.elf
 *.ind
 .env
-/examples/*/*/build-*
+/examples/*/*/build*
 test_old/
 tests_obsolete/
 _build
diff --git a/hw/bsp/mimxrt1015_evk/board.mk b/hw/bsp/mimxrt1015_evk/board.mk
index abb6bc38..7df60c2c 100644
--- a/hw/bsp/mimxrt1015_evk/board.mk
+++ b/hw/bsp/mimxrt1015_evk/board.mk
@@ -50,3 +50,7 @@ JLINK_IF = swd
 # flash by copying bin file to DAP Mass Storage
 flash: $(BUILD)/$(BOARD)-firmware.bin
 	cp $< /media/$(USER)/RT1015-EVK/
+
+# flash using pyocd
+#flash: $(BUILD)/$(BOARD)-firmware.hex
+#	pyocd flash -b MIMXRT1015-EVK $<
diff --git a/src/device/dcd.h b/src/device/dcd.h
index f4e6edb9..08b217fa 100644
--- a/src/device/dcd.h
+++ b/src/device/dcd.h
@@ -106,10 +106,10 @@ void dcd_set_config (uint8_t rhport, uint8_t config_num);
 // Wake up host
 void dcd_remote_wakeup(uint8_t rhport);
 
-// Connect or disconnect D+/D- line pull-up resistor.
-// Defined in dcd source if MCU has internal pull-up.
-// Otherwise, may be defined in BSP.
+// Connect by enabling internal pull-up resistor on D+/D-
 void dcd_connect(uint8_t rhport) TU_ATTR_WEAK;
+
+// Disconnect by disabling internal pull-up resistor on D+/D-
 void dcd_disconnect(uint8_t rhport) TU_ATTR_WEAK;
 
 //--------------------------------------------------------------------+
diff --git a/src/portable/nxp/lpc17_40/dcd_lpc17_40.c b/src/portable/nxp/lpc17_40/dcd_lpc17_40.c
index 884260f3..dfdae145 100644
--- a/src/portable/nxp/lpc17_40/dcd_lpc17_40.c
+++ b/src/portable/nxp/lpc17_40/dcd_lpc17_40.c
@@ -181,9 +181,7 @@ void dcd_init(uint8_t rhport)
   LPC_USB->UDCAH = (uint32_t) _dcd.udca;
   LPC_USB->DMAIntEn = (DMA_INT_END_OF_XFER_MASK /*| DMA_INT_NEW_DD_REQUEST_MASK*/ | DMA_INT_ERROR_MASK);
 
-  sie_write(SIE_CMDCODE_DEVICE_STATUS, 1, 1);    // connect
-
-  // USB IRQ priority should be set by application previously
+  // Clear pending IRQ
   NVIC_ClearPendingIRQ(USB_IRQn);
 }
 
@@ -219,6 +217,18 @@ void dcd_remote_wakeup(uint8_t rhport)
   (void) rhport;
 }
 
+void dcd_connect(uint8_t rhport)
+{
+  (void) rhport;
+  sie_write(SIE_CMDCODE_DEVICE_STATUS, 1, SIE_DEV_STATUS_CONNECT_STATUS_MASK);
+}
+
+void dcd_disconnect(uint8_t rhport)
+{
+  (void) rhport;
+  sie_write(SIE_CMDCODE_DEVICE_STATUS, 1, 0);
+}
+
 //--------------------------------------------------------------------+
 // CONTROL HELPER
 //--------------------------------------------------------------------+
diff --git a/src/portable/nxp/lpc_ip3511/dcd_lpc_ip3511.c b/src/portable/nxp/lpc_ip3511/dcd_lpc_ip3511.c
index 9af8e601..980fa118 100644
--- a/src/portable/nxp/lpc_ip3511/dcd_lpc_ip3511.c
+++ b/src/portable/nxp/lpc_ip3511/dcd_lpc_ip3511.c
@@ -95,7 +95,7 @@ enum {
   CMDSTAT_DEVICE_ADDR_MASK    = TU_BIT(7 )-1,
   CMDSTAT_DEVICE_ENABLE_MASK  = TU_BIT(7 ),
   CMDSTAT_SETUP_RECEIVED_MASK = TU_BIT(8 ),
-  CMDSTAT_DEVICE_CONNECT_MASK = TU_BIT(16), ///< reflect the softconnect only, does not reflect the actual attached state
+  CMDSTAT_DEVICE_CONNECT_MASK = TU_BIT(16), ///< reflect the soft-connect only, does not reflect the actual attached state
   CMDSTAT_DEVICE_SUSPEND_MASK = TU_BIT(17),
   CMDSTAT_CONNECT_CHANGE_MASK = TU_BIT(24),
   CMDSTAT_SUSPEND_CHANGE_MASK = TU_BIT(25),
@@ -209,6 +209,18 @@ void dcd_remote_wakeup(uint8_t rhport)
   (void) rhport;
 }
 
+void dcd_connect(uint8_t rhport)
+{
+  (void) rhport;
+  DCD_REGS->DEVCMDSTAT |= CMDSTAT_DEVICE_CONNECT_MASK;
+}
+
+void dcd_disconnect(uint8_t rhport)
+{
+  (void) rhport;
+  DCD_REGS->DEVCMDSTAT &= ~CMDSTAT_DEVICE_CONNECT_MASK;
+}
+
 //--------------------------------------------------------------------+
 // DCD Endpoint Port
 //--------------------------------------------------------------------+
diff --git a/src/portable/nxp/transdimension/dcd_transdimension.c b/src/portable/nxp/transdimension/dcd_transdimension.c
index 2872f143..cea7c2b0 100644
--- a/src/portable/nxp/transdimension/dcd_transdimension.c
+++ b/src/portable/nxp/transdimension/dcd_transdimension.c
@@ -322,7 +322,7 @@ void dcd_init(uint8_t rhport)
 {
   tu_memclr(&_dcd_data, sizeof(dcd_data_t));
 
-  dcd_registers_t* const dcd_reg = _dcd_controller[rhport].regs;
+  dcd_registers_t* dcd_reg = _dcd_controller[rhport].regs;
 
   // Reset controller
   dcd_reg->USBCMD |= USBCMD_RESET;
@@ -342,7 +342,6 @@ void dcd_init(uint8_t rhport)
   dcd_reg->USBINTR = INTR_USB | INTR_ERROR | INTR_PORT_CHANGE | INTR_RESET | INTR_SUSPEND /*| INTR_SOF*/;
 
   dcd_reg->USBCMD &= ~0x00FF0000; // Interrupt Threshold Interval = 0
-  dcd_reg->USBCMD |= TU_BIT(0); // connect
 }
 
 void dcd_int_enable(uint8_t rhport)
@@ -376,6 +375,18 @@ void dcd_remote_wakeup(uint8_t rhport)
   (void) rhport;
 }
 
+void dcd_connect(uint8_t rhport)
+{
+  dcd_registers_t* dcd_reg = _dcd_controller[rhport].regs;
+  dcd_reg->USBCMD |= USBCMD_RUN_STOP;
+}
+
+void dcd_disconnect(uint8_t rhport)
+{
+  dcd_registers_t* dcd_reg = _dcd_controller[rhport].regs;
+  dcd_reg->USBCMD &= ~USBCMD_RUN_STOP;
+}
+
 //--------------------------------------------------------------------+
 // HELPER
 //--------------------------------------------------------------------+
diff --git a/src/portable/template/dcd_template.c b/src/portable/template/dcd_template.c
index d29c98e5..ba1383f3 100644
--- a/src/portable/template/dcd_template.c
+++ b/src/portable/template/dcd_template.c
@@ -91,6 +91,18 @@ void dcd_remote_wakeup (uint8_t rhport)
   (void) rhport;
 }
 
+// Connect by enabling internal pull-up resistor on D+/D-
+void dcd_connect(uint8_t rhport)
+{
+  (void) rhport;
+}
+
+// Disconnect by disabling internal pull-up resistor on D+/D-
+void dcd_disconnect(uint8_t rhport)
+{
+  (void) rhport;
+}
+
 //--------------------------------------------------------------------+
 // Endpoint API
 //--------------------------------------------------------------------+