Merge pull request #789 from kapacuk/freertos

When used with FreeRTOS, lower the interrupt priority for OTG_FS_IRQn

hw/bsp/stm32f4/family.c

@@ -51,7 +51,7 @@ void board_init(void)
   SysTick_Config(SystemCoreClock / 1000);
 #elif CFG_TUSB_OS == OPT_OS_FREERTOS
   // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
-  //NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
+  NVIC_SetPriority(OTG_FS_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
 #endif
 
   GPIO_InitTypeDef  GPIO_InitStruct;