Managing DMA Callback and FreeRTOS Tasks with Timing Constraints on STM32f4
My current project involves constantly receiving digital samples through DMA on an STM32f4 and performing DSP in the complete callback interrupt triggered after each sample. However, frequent callbacks are hindering freeRTOS from running other tasks while DMA waits for completion. My objective is to allow freeRTOS tasks to run every 6ms following a completed DMA callback.
Initially, I thought about disabling interrupts using
I then started a timer that runs at intervals of 6ms before restoring normal function via calling back with
I would greatly appreciate any feedback or advice. Thanks
Initially, I thought about disabling interrupts using
__disable_irq()__enable_irq()__set_BASEPRI(priority << (8 - __NVIC_PRIO_BITS))I then started a timer that runs at intervals of 6ms before restoring normal function via calling back with
_ _set_BASEPRI(0)I would greatly appreciate any feedback or advice. Thanks
Solution
Adjusting the timing might help yeah , but it's more about ensuring the callbacks don’t hog all the CPU time. By using double buffering or adjusting interrupt priorities, you’re already reducing the time DMA interrupts take. If FreeRTOS still isn’t getting enough time, you might also consider tweaking task priorities or adding some delay within the callback if possible…
