Hi, I am porting freeRTOS v10.0.1 for STM32L496 Nucleo-144 board. FreeRTOS website mentioned that porting for STM32 need to define following marco in freeRTOSConfig.h while xPortSysTickHandler already define in STM32CubeMX generated file and ARM_CM4Fport.c. So the compiler will complain about duplicate define. Any solution for this? https://www.freertos.org/FreeRTOS-for-Cortex-M3-STM32-STM32F100-Discovery.html

#define vPortSVCHandler      SVC_Handler
#define xPortPendSVHandler   PendSV_Handler
#define xPortSysTickHandler  SysTick_Handler

Thanks,
Dick

Did you actually try this and get a compiler error? If so, please post the error, as the macro is re-defining xPortSystickHandler to SysTick_Handler – so removing a definition of the function that adding another one. Perhaps there is some confusion on how to use FreeRTOS and the ST Cube HAL at the same time as both want to install their own SysTick handler. The normal FreeRTOS way of doing that would be to install the FreeRTOS SysTick handler then use the tick hook function to call a third part tick handler if necessary. However in the ST case it has to be the other way around as the ST interrupt service routines poll the tick time (not a good thing to do in an ISR) so have to run at the highest priority – therefore when combining FreeRTOS with the ST Cube HAL you have to install the ST SystTick handler and call the FreeRTOS one from that? Confused? Yes, but if you create your project from the STM32CumeMX then it does this for you so just use the project it creates for you.