diff --git a/demos/host/host_freertos/.cproject b/demos/host/host_freertos/.cproject
index da8f3f998..d93e4bdb6 100644
--- a/demos/host/host_freertos/.cproject
+++ b/demos/host/host_freertos/.cproject
@@ -465,6 +465,7 @@
 								<option id="com.crt.advproject.gcc.thumb.1149795974" name="Thumb mode" superClass="com.crt.advproject.gcc.thumb" value="true" valueType="boolean"/>
 								<option id="gnu.c.compiler.option.preprocessor.def.symbols.510918973" name="Defined symbols (-D)" superClass="gnu.c.compiler.option.preprocessor.def.symbols" valueType="definedSymbols">
 									<listOptionValue builtIn="false" value="__REDLIB__"/>
+									<listOptionValue builtIn="false" value="TUSB_CFG_OS_TASK_PRIO=(configMAX_PRIORITIES-5)"/>
 									<listOptionValue builtIn="false" value="__USE_CMSIS=CMSISv2p10_LPC43xx_DriverLib"/>
 									<listOptionValue builtIn="false" value="CORE_M4"/>
 									<listOptionValue builtIn="false" value="MCU=MCU_LPC43XX"/>
diff --git a/demos/host/src/keyboard_app.c b/demos/host/src/keyboard_app.c
index 889bb0c48..7269d4eba 100644
--- a/demos/host/src/keyboard_app.c
+++ b/demos/host/src/keyboard_app.c
@@ -40,6 +40,8 @@
 //--------------------------------------------------------------------+
 #include "keyboard_app.h"
 
+#if TUSB_CFG_HOST_HID_KEYBOARD
+
 //--------------------------------------------------------------------+
 // MACRO CONSTANT TYPEDEF
 //--------------------------------------------------------------------+
@@ -48,11 +50,12 @@
 //--------------------------------------------------------------------+
 // INTERNAL OBJECT & FUNCTION DECLARATION
 //--------------------------------------------------------------------+
-static tusb_keyboard_report_t usb_keyboard_report TUSB_CFG_ATTR_USBRAM;
-
+//OSAL_TASK_DEF(keyboard_task_def, keyboard_app_task, 128, )
 OSAL_QUEUE_DEF(queue_kbd_report, QUEUE_KEYBOARD_REPORT_DEPTH, tusb_keyboard_report_t);
 static osal_queue_handle_t q_kbd_report_hdl;
 
+static tusb_keyboard_report_t usb_keyboard_report TUSB_CFG_ATTR_USBRAM;
+
 // only convert a-z (case insensitive) +  0-9
 static inline uint8_t keycode_to_ascii(uint8_t keycode) ATTR_CONST ATTR_ALWAYS_INLINE;
 
@@ -91,6 +94,9 @@ void tusbh_hid_keyboard_isr(uint8_t dev_addr, uint8_t instance_num, tusb_event_t
 //--------------------------------------------------------------------+
 void keyboard_app_init(void)
 {
+  memclr_(&usb_keyboard_report, sizeof(tusb_keyboard_report_t));
+
+//  ASSERT( osal_task_create() )
   q_kbd_report_hdl = osal_queue_create(&queue_kbd_report);
 
   // TODO keyboard_app_task create
@@ -134,3 +140,5 @@ static inline uint8_t keycode_to_ascii(uint8_t keycode)
       ( KEYBOARD_KEYCODE_1 <= keycode && keycode < KEYBOARD_KEYCODE_0)  ? ( (keycode - KEYBOARD_KEYCODE_1) + '1' ) :
       ( KEYBOARD_KEYCODE_0 == keycode)                                  ? '0' : 'x';
 }
+
+#endif
diff --git a/demos/host/src/main.c b/demos/host/src/main.c
index ad7d2c8a5..2c925eb1c 100644
--- a/demos/host/src/main.c
+++ b/demos/host/src/main.c
@@ -28,8 +28,13 @@ int main(void)
   tusb_init();
 
   //------------- application task init -------------//
+#if TUSB_CFG_HOST_HID_KEYBOARD
   keyboard_app_init();
+#endif
+
+#if TUSB_CFG_HOST_HID_MOUSE
   mouse_app_init();
+#endif
 
   while (1)
   {
diff --git a/demos/host/src/mouse_app.c b/demos/host/src/mouse_app.c
index 4d81941ab..acafe8d14 100644
--- a/demos/host/src/mouse_app.c
+++ b/demos/host/src/mouse_app.c
@@ -40,6 +40,8 @@
 //--------------------------------------------------------------------+
 #include "mouse_app.h"
 
+#if TUSB_CFG_HOST_HID_MOUSE
+
 //--------------------------------------------------------------------+
 // MACRO CONSTANT TYPEDEF
 //--------------------------------------------------------------------+
@@ -118,3 +120,5 @@ OSAL_TASK_FUNCTION( mouse_app_task ) (void* p_task_para)
 
   OSAL_TASK_LOOP_END
 }
+
+#endif
diff --git a/demos/host/src/tusb_config.h b/demos/host/src/tusb_config.h
index d6f3c55ef..47cab3e81 100644
--- a/demos/host/src/tusb_config.h
+++ b/demos/host/src/tusb_config.h
@@ -93,6 +93,7 @@
 #define TUSB_CFG_DEBUG                3
 
 //#define TUSB_CFG_OS                   TUSB_OS_NONE // defined using eclipse build
+//#define TUSB_CFG_OS_TASK_PRIO
 
 #define TUSB_CFG_OS_TICKS_PER_SECOND  1000
 
diff --git a/tinyusb/common/errors.c b/tinyusb/common/errors.c
index 2de115697..6c53bd007 100644
--- a/tinyusb/common/errors.c
+++ b/tinyusb/common/errors.c
@@ -35,12 +35,11 @@
  * This file is part of the tinyUSB stack.
  */
 
-#include "primitive_types.h"
 #include "errors.h"
 
 #if TUSB_CFG_DEBUG == 3
 
-uint8_t const* const TUSB_ErrorStr[] =
+char const* const TUSB_ErrorStr[] =
 {
  ERROR_TABLE(ERROR_STRING)
  0
diff --git a/tinyusb/common/errors.h b/tinyusb/common/errors.h
index 0392865e1..cf10a63fa 100644
--- a/tinyusb/common/errors.h
+++ b/tinyusb/common/errors.h
@@ -49,7 +49,6 @@
 #ifndef _TUSB_ERRORS_H_
 #define _TUSB_ERRORS_H_
 
-#include "primitive_types.h"
 #include "tusb_option.h"
 
 #ifdef __cplusplus
@@ -87,7 +86,7 @@ typedef enum {
 
 #if TUSB_CFG_DEBUG == 3
 /// Enum to String for debugging purposes. Only available if \ref TUSB_CFG_DEBUG > 0
-extern uint8_t const* const TUSB_ErrorStr[];
+extern char const* const TUSB_ErrorStr[];
 #endif
 
 #ifdef __cplusplus
diff --git a/tinyusb/hal/hal.h b/tinyusb/hal/hal.h
index a79ea4a16..4916aea08 100644
--- a/tinyusb/hal/hal.h
+++ b/tinyusb/hal/hal.h
@@ -52,6 +52,7 @@
 #define _TUSB_HAL_H_
 
 #include "tusb_option.h"
+#include "common/primitive_types.h"
 #include "common/errors.h"
 #include "common/compiler/compiler.h"
 
diff --git a/tinyusb/host/usbh.c b/tinyusb/host/usbh.c
index 55f3eb771..54f9e7dce 100644
--- a/tinyusb/host/usbh.c
+++ b/tinyusb/host/usbh.c
@@ -89,7 +89,7 @@ static host_class_driver_t const usbh_class_drivers[TUSB_CLASS_MAX_CONSEC_NUMBER
 usbh_device_info_t usbh_devices[TUSB_CFG_HOST_DEVICE_MAX+1] TUSB_CFG_ATTR_USBRAM; // including zero-address
 
 //------------- Enumeration Task Data -------------//
-OSAL_TASK_DEF(enum_task, usbh_enumeration_task, 128, OSAL_PRIO_HIGH);
+OSAL_TASK_DEF(enum_task, usbh_enumeration_task, 128, TUSB_CFG_OS_TASK_PRIO);
 OSAL_QUEUE_DEF(enum_queue, ENUM_QUEUE_DEPTH, uint32_t);
 osal_queue_handle_t enum_queue_hdl;
 STATIC_ uint8_t enum_data_buffer[TUSB_CFG_HOST_ENUM_BUFFER_SIZE] TUSB_CFG_ATTR_USBRAM;
diff --git a/tinyusb/osal/osal_common.h b/tinyusb/osal/osal_common.h
index eda859145..6a9965fea 100644
--- a/tinyusb/osal/osal_common.h
+++ b/tinyusb/osal/osal_common.h
@@ -64,12 +64,6 @@ enum
   OSAL_TIMEOUT_WAIT_FOREVER = 0x0EEEEEEE
 };
 
-typedef enum {
-  OSAL_PRIO_LOW,
-  OSAL_PRIO_NORMAL,
-  OSAL_PRIO_HIGH
-}osal_prio_t;
-
 static inline uint32_t osal_tick_from_msec(uint32_t msec) ATTR_CONST ATTR_ALWAYS_INLINE;
 static inline uint32_t osal_tick_from_msec(uint32_t msec)
 {
diff --git a/tinyusb/osal/osal_freeRTOS.h b/tinyusb/osal/osal_freeRTOS.h
index d92cb374c..cd92812cb 100644
--- a/tinyusb/osal/osal_freeRTOS.h
+++ b/tinyusb/osal/osal_freeRTOS.h
@@ -75,7 +75,7 @@ extern "C" {
   void task_func
 
 typedef struct {
-  signed portCHAR const * name;
+  char const * name;
   pdTASK_CODE code;
   unsigned portSHORT stack_depth;
   unsigned portBASE_TYPE prio;
@@ -92,7 +92,7 @@ typedef struct {
 static inline tusb_error_t osal_task_create(osal_task_t *task) ATTR_ALWAYS_INLINE;
 static inline tusb_error_t osal_task_create(osal_task_t *task)
 {
-  return pdPASS == xTaskCreate(task->code, task->name, task->stack_depth, NULL, task->prio, NULL) ?
+  return pdPASS == xTaskCreate(task->code, (signed portCHAR const *) task->name, task->stack_depth, NULL, task->prio, NULL) ?
     TUSB_ERROR_NONE : TUSB_ERROR_OSAL_TASK_CREATE_FAILED;
 }
 
@@ -104,7 +104,8 @@ static inline tusb_error_t osal_task_create(osal_task_t *task)
 
 //------------- Sub Task -------------//
 #define OSAL_SUBTASK_BEGIN // TODO refractor move
-#define OSAL_SUBTASK_END
+#define OSAL_SUBTASK_END \
+  return TUSB_ERROR_NONE;
 
 #define OSAL_SUBTASK_INVOKED_AND_WAIT(subtask, status) \
   status = subtask
diff --git a/tinyusb/tusb_option.h b/tinyusb/tusb_option.h
index 4d20b3049..7773351d2 100644
--- a/tinyusb/tusb_option.h
+++ b/tinyusb/tusb_option.h
@@ -114,6 +114,10 @@
   #ifndef TUSB_CFG_OS_TICKS_PER_SECOND
     #error TUSB_CFG_OS_TICKS_PER_SECOND is required to use with OS_NONE
   #endif
+#else
+  #ifndef TUSB_CFG_OS_TASK_PRIO
+    #error TUSB_CFG_OS_TASK_PRIO need to be defined (hint: use the highest if possible)
+  #endif
 #endif
 
 #ifndef TUSB_CFG_CONFIGURATION_MAX
diff --git a/vendor/freertos/FreeRTOSConfig.h b/vendor/freertos/FreeRTOSConfig.h
index 6737e9242..ebf0b06d4 100644
--- a/vendor/freertos/FreeRTOSConfig.h
+++ b/vendor/freertos/FreeRTOSConfig.h
@@ -68,7 +68,7 @@
 
 #define configUSE_PREEMPTION		1
 #define configUSE_IDLE_HOOK			1
-#define configMAX_PRIORITIES		( ( unsigned portBASE_TYPE ) 8 )
+#define configMAX_PRIORITIES		( ( unsigned portBASE_TYPE ) 16 )
 #define configUSE_TICK_HOOK			0
 #define configCPU_CLOCK_HZ			( ( unsigned long ) SystemCoreClock )
 #define configTICK_RATE_HZ			( ( portTickType ) 1000 )