S32KのトピックRe: S32K144 FreeRTOS from ISR API issue

S32K144 FreeRTOS from ISR API issue

SABARINATH_kh — Thu, 24 Jul 2025 12:45:44 GMT

I was trying to set an event from UART recieve ISR call back function using FreeRTOS API "xEventGroupSetBitsFromISR()",
but the code execution got halted in "configASSERT( ucCurrentPriority >= ucMaxSysCallPriority )" of function - void vPortValidateInterruptPriority( void ) [port.c].

During debugging, it was observed that the priority of the calling interrupt was set to '0', as determined by executing the line:
"ucCurrentPriority = pcInterruptPriorityRegisters[ ulCurrentInterrupt ]"

so eventully the execution is stuck in this assert statement ("configASSERT( ucCurrentPriority >= ucMaxSysCallPriority )").

Also tried in existing FreeRTOS example code from s32 SDK, still execution halted in same assert statement

Is there any way to fix this

Re: S32K144 FreeRTOS from ISR API issue

PetrS — Fri, 25 Jul 2025 05:07:50 GMT

Hi,

as description outlined, for LPUART assign lower ISR priority (numerically higher number) then configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY is.

In SDK interrupt priority can be changed just by calling INT_SYS_SetPriority in your source code, otherwise the SDK will use default priorities of the hardware.

BR, Petr

Re: S32K144 FreeRTOS from ISR API issue

SABARINATH_kh — Mon, 28 Jul 2025 07:11:04 GMT

Hi PetrS,

Sorry for the delay in responding
I have modified the code by changing the interrupt Priority using above mentioned API "INT_SYS_SetPriority"

Still its getting Priority value as "Zero"

Re: S32K144 FreeRTOS from ISR API issue

PetrS — Mon, 28 Jul 2025 13:42:17 GMT

Hi,

can you share simplified project showing an issue?

BR, Petr

Re: S32K144 FreeRTOS from ISR API issue

SABARINATH_kh — Tue, 29 Jul 2025 06:16:40 GMT

Hi,

I am facing this issue in all the freeRTOS codes which uses "FromISR" API, even i tried with the samples provided by S32Design studio.

Currently i am trying the sample "freertos_s32k144" in this particular example, from a button ISR handler there is freeRTOS function call "xTimerResetFromISR( xButtonLEDTimer, &xHigherPriorityTaskWoken ); , Even this function call end up in the same configASSERT.

I have attached the call stack and the sample code for your reference.

Re: S32K144 FreeRTOS from ISR API issue

PetrS — Thu, 31 Jul 2025 07:22:58 GMT

Hi,

I tested your project and it works normally.

BR, Petr

Re: S32K144 FreeRTOS from ISR API issue

SABARINATH_kh — Thu, 31 Jul 2025 12:38:20 GMT

HI,
Did you tried pressing the button (then it will call fromISR API) if so, can you please help me what causing issue in my development board

Re: S32K144 FreeRTOS from ISR API issue

PetrS — Fri, 01 Aug 2025 12:45:37 GMT

Hi,

yes, on my S32k144EVB-Q100 (revC1) it toggles Green LED repeatedly.
Once pressing SW3, Red LED will be ON and is going OFF after 5sec unless SW3 is press again. So exactly as example is written.
To be honest, don't know why same SW is not working on your board, assume same one.

BR, Petr