STM32H563: Not able to set NVIC priorities properly for HDMA & SPI

[PFlor.2]

See attached .ioc

Tried to change LIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY from 5 to 1 in the FreeRTOS settings, but didn't seem to allow me to lower the priority levels in NVIC settings.

[Amel NASRI]

This is a follow-up of the discussion STM32H563 and SPI DMA Transfer issue. Current issue is related to STM32CubeMX @Semer CHERNI .

[Semer CHERNI]

Hello @PFlor.2 

First let me thank you for posting.

Could you provide more details about which priority level you are not able to modify.
Share screenshots if possible.

KR,
Semer.

[PFlor.2]

Pretty much any of the peripheral priority levels in the NVIC settings except the TimeBase which is using Timer6, it is set to priority 0 but all others cannot be set lower than 5 in .ioc NVIC settings.  Thought maybe it had something to do with using FreeRTOS.

[PFlor.2 · Accepted solution]

Turns out there was a problem introduced that caused the FreeRTOS kernel not to run correctly which seems to be blocking the interrupts.

I believe when FreeRTOS is used it reserves priority level below 5 except systimer, so all other interrupts must use priority 5 or above.

Once the FreeRTOS issue was resolved the SPI/DMA transfer worked as expected with SPI priority set to 5 and DMA set to 6