watchdog test

[Lily_31_amz]

Hello NXP team, 

i need to perfrom a simple watch dog test, to check if it reset the MCU.

i come with the following concept, could be wrong !

Configure the watchdog and configure the systick

void Start_Wd_Test()
{
	s_refreshNumber = 0;
	/* Install IRQ handlers for WDOG and SysTick interrupts */
	INT_SYS_InstallHandler(WDOG_EWM_IRQn, WDOG_ISR, (isr_t *)0);
	INT_SYS_InstallHandler(SysTick_IRQn, SysTick_Handler_wd, (isr_t *)0);

	/* Enable Watchdog IRQ */
	INT_SYS_EnableIRQ(WDOG_EWM_IRQn);

	/* Configure and enable SysTick */
	SysTick_Init();
	SysTick_Enable();

	/* Initialize WDOG */
	WDOG_DRV_Init(INST_WATCHDOG1, &watchdog1_Config0);
}

start counting and feeding the watchdog for 8 cycles, once elapsed the MCU should reset.

/* Initialize SysTick counter */
void SysTick_Init(void)
{
	S32_SysTick->RVR = 0xFFFFFFul;
	S32_SysTick->CVR = 0ul;
	S32_SysTick->CSR = 0u;
}

/* Enable SysTick counter and interrupt */
void SysTick_Enable(void)
{
	S32_SysTick->CSR = S32_SysTick_CSR_TICKINT(1u) | S32_SysTick_CSR_ENABLE(1);
}

/* Disable SysTick */
void SysTick_Disable(void)
{
	S32_SysTick->CSR = 0ul;
}

/* SysTick IRQ handler */
void SysTick_Handler_wd(void)
{
	/* Variable that stores the number of Watchdog triggers */

	/* After 8 watchdog refreshes, the interrupt will no longer reset the wdog counter */
	if(s_refreshNumber < 8)
	{
		/* Reset Watchdog counter */
		WDOG_DRV_Trigger(INST_WATCHDOG1);
		//printf("watch dog reseted \r\n");
		/* Increment refresh number */
		s_refreshNumber++;
	}
	
}

The mcu throw an error "Stoped at vector catch" , and i can no longer comunicate with it.

any suggestion on how to do this correctly ? i mean once the MCU reseted,  it should print the status to serial consol  saying that the reset was perfromed correctly and the MCU should start working.

Thank you.

[Robin_Shen]

Hi 

The test content you mentioned seems to be very similar to the example wdog_interrupt in the S32SDK_S32K1XX_RTM_4.0.2. Have you read the introduction to this example?(file:///C:/NXP/S32DS.3.4/S32DS/software/S32SDK_S32K1XX_RTM_4.0.2/doc/html_S32K144/wdog_interrupt_s32k144_group.html)

Best Regards,
Robin
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[Lily_31_amz]

Hello Robin,

yes this example was taking from the SDK, the watchdog functionalities is correct, after 8 cycles the MCU reset and stopps.

is there a way after a reset happens, to restart the board automatically ? and eventually check in a register if the reset was done correctly ?

regards.

[Robin_Shen · Accepted solution]

According to the Application description: If the FLASH configuration will be used, then the code will use the Reset Control Module to detect if the reset was caused by the Watchdog and will stop the execution of the program.

After reset caused by the Watchdog(line 128), user can add a flag in it. And then you can add your own function in while loop according to flag.

[Lily_31_amz]

Thanks a lot Robin for you answer, i think we are close

im using freeRTOS, and once the reset is performed the applications stops and does not restart even if i turn the main power OFF-ON.  

is it possible to implement a Reset_Handler ? if so please give me an example.

Thank you.