Missing configuration KERNEL_INTERRUPT_PRIORITY for Cortex M23 and M33 ports?

Kernel
1

Hi together,

the available priority levels are implementation specific, but in the ports of the Cortex M23 and M33 the splitting of the group is “hard-splitted” based on the define portMIN_INTERRUPT_PRIORITY.

Is this really how it should be?

For example the STM32U5, defines __NVIC_PRIO_BITS with 4, so my expectation is to configure this in the FreeRTOSConfig.h like for a M3 or M4 device via configKERNEL_INTERRUPT_PRIORITY / configMAX_SYSCALL_INTERRUPT_PRIORITY.

Thanks in advance!

2

Looks like configKERNEL_INTERRUPT_PRIORITY is no longer needed in the M23/M33. Instead, these ports simply use the minimum interrupt priority (which is required anyway). And thanks to the Cortex-M architecture, the value 0xFF can be written to select the lowest interrupt priority, regardless of how many priority bits are implemented.

3

Ok I got it, thanks for the clarification! :smiley: :+1: