STM32 RTOS timer interrupt and threads

0
votes

I am working on a project where I need to execute 2 pieces of code off TIM interrupts. One of them has a slightly higher priority than the other, and both will be running on 2 different timers (of course not at the same time interval). Due to both timers being proportional to another (one is 1KHz, one is 8Khz) both will trigger at the same time.

Since I am already using the RTOS middle-ware for another purposes (threads of a much lower priority than these too), I was thinking of creating one thread of each these routines.

However, looking at how cubeMX is generating code, I am even wondering if this is possible.

I can start/stop these timers from any thread, but there is only one HAL_TIM_PeriodElapsedCallback which you usually fill with if statements like so:

if (htim->Instance == TIM2)

Am I correct to assume, regardless of which thread the timers are started from, the TIM callback will always occur "outside" of the RTOS environment?

if so, what would be a better strategy to achieve something close to what I need?

Cheers

1
timerstm32interruptrtos

1 Answers

0
votes

Interrupts will triger. But remember:

  1. Its priority (not the RTOS priority as they are unrelated) must be lower the SVC interrupt if you want to use any ...fromISR RTOS functions
  2. They will not happen at the same time (as you have only one core)