ResumeAllInterrupts() does not work

[wjhtu]

Hi, I have a problem when using OsIf_SuspendAllInterrupts() and OsIf_ResumeAllInterrupts() .

I setup a simple project with STM0 in a 5ms periodic interrupt . When I call OsIf_SuspendAllInterrupts() and then call OsIf_ResumeAllInterrupts() immediately  the timer resumes and runs normally. 

But if I do some "heavy work" betweeen these two functions, for example a soft-delay in several minitues, the timer cannot resumes.

My board is S32K344 EVB RED.

Thank you for any help. 

My Code:

static int os_timer_ms=0;

void Stm0Ch0Callback(void)

{

os_timer_ms+=5;

if(os_timer_ms>99999)

{

os_timer_ms=0;

}

if(os_timer_ms%1000==0)

printf("os_timer_ms=%d\r\n",os_timer_ms);

}

void SoftDelayMs(int ms)

{

for(int i=0;i<ms;i++)

{

for(int j=0;j<16000;j++)

{

int k=i+j;

}

}

}

int main(void)

{

BoardInit();

HAL_LED_Init();

HAL_UART_Init();

HAL_STM0_Init();

printf("hello!\r\n");

    for(;;)

    {

    static int timer_ms=0;

    if(timer_ms<os_timer_ms)

    {

    timer_ms=os_timer_ms;

    if(timer_ms==5000)

    {

    printf("a\r\n");

    OsIf_SuspendAllInterrupts();

    printf("b\r\n");

    SoftDelayMs(5000);

    printf("c\r\n");

    OsIf_ResumeAllInterrupts();

    printf("d\r\n");

    }

    }

        if(exit_code != 0)

        {

            break;

        }

    }

    return exit_code;

}

[Senlent · Accepted solution]

Hi@wjhtu

When you turn off all interrupts, SMT will still count. Then turn on interrupts after a delay, at this time, the value of CNT is already much greater than the set trigger value, and it will no longer trigger interrupts.
So you can try clearing SMT->CNT after calling OsIf_ResumeAllInterrupts, and everything will be fine.

[wjhtu]

Yes, it does work! Thank you very much!