CMSIS RTOS V1 Semaphore issues in STM32CubeIDE

[DLim.16]

Hi,

I am using STM32F405, CMSIS RTOS V1, and STM32CubeIDE. I want to create a timer interrupt that periodically release the semaphore to signal the execution of a task.

The issue is that it gets stuck after osSemaphoreRelease is called in the interrupt. Please refer to my source code.

How do I troubleshoot this?

Thanks.

[Karl Yamashita]

You have two different semaphores. One that looks like CubeMX created "Semaphore1Handle" which you release. Then you create another in StartDefaultTask "semaphore" which you wait on.

[KnarfB · Accepted solution]

Dont think so, because Semaphore1Handle is passed as a parameter to the task.

In the task you are checking if the semaphore was created., makes sense.

But, in HAL_TIM_PeriodElapsedCallback you are not checking.

Maybe the first IRQ comes too early. Try shifting the line HAL_TIM_Base_Start_IT(&htim3); down.

[Pavel A.]

osSemaphoreRelease is a RTOS API. Do you think it can be called from an interrupt handler? and is the priority of the interrupt low enough to use RTOS calls?

-- pa

[DLim.16]

I did that, and it worked, thanks!!!