Watchdog Interrupt

davidzhou — Wed, 21 Sep 2016 14:33:32 GMT

Hi,

I have K60 towerboard:_K60P144M150SF3RM , MQX 4.2 Code Warrior v10.6.4

Using PE generated Watchdog with Interrupt then Reset CPU option:

The interrupt is INT_Watchdog,

but I cannot find anything in the Init() generated code that the INT_Watchdog is associated with any ISR.

LDD_TDeviceData* WDog1_Init(LDD_TUserData *UserDataPtr)
{
/* Allocate device structure */
WDog1_TDeviceData *DeviceDataPrv;

/* {MQX RTOS Adapter} Driver memory allocation: RTOS function call is defined by MQX RTOS Adapter property */
DeviceDataPrv = (WDog1_TDeviceData *)_mem_alloc_system((_mem_size)sizeof(WDog1_TDeviceData));
#if MQX_CHECK_MEMORY_ALLOCATION_ERRORS
if (DeviceDataPrv == NULL) {
    return (NULL);
}
#endif
DeviceDataPrv->UserDataPtr = UserDataPtr; /* Store the RTOS device structure */
/* {MQX RTOS Adapter} Critical section begin (RTOS function call is defined by MQX RTOS Adapter property) */
_int_disable();
/* WDOG_UNLOCK: WDOGUNLOCK=0xC520 */
WDOG_UNLOCK = WDOG_UNLOCK_WDOGUNLOCK(0xC520); /* Key 1 */
/* WDOG_UNLOCK: WDOGUNLOCK=0xD928 */
WDOG_UNLOCK = WDOG_UNLOCK_WDOGUNLOCK(0xD928); /* Key 2 */
/* WDOG_WINH: WINHIGH=0 */
WDOG_WINH = WDOG_WINH_WINHIGH(0x00); /* Setup window register high */
/* WDOG_WINL: WINLOW=0 */
WDOG_WINL = WDOG_WINL_WINLOW(0x00); /* Setup window register low */
/* WDOG_TOVALH: TOVALHIGH=0xE0 */
WDOG_TOVALH = WDOG_TOVALH_TOVALHIGH(0xE0); /* Setup time-out value register high */
/* WDOG_TOVALL: TOVALLOW=2 */
WDOG_TOVALL = WDOG_TOVALL_TOVALLOW(0x02); /* Setup time-out value register low */
/* WDOG_PRESC: ??=0,??=0,??=0,??=0,??=0,PRESCVAL=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0 */
WDOG_PRESC = WDOG_PRESC_PRESCVAL(0x00); /* Setup status register */
/* WDOG_STCTRLL: INTFLG=1,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=1 */
WDOG_STCTRLL = (WDOG_STCTRLL_INTFLG_MASK | 0x01U); /* Setup status register */
/* WDOG_STCTRLH: ??=0,DISTESTWDOG=1,BYTESEL=0,TESTSEL=0,TESTWDOG=0,??=0,??=1,WAITEN=1,STOPEN=1,DBGEN=0,ALLOWUPDATE=0,WINEN=0,IRQRSTEN=1,CLKSRC=1,WDOGEN=1 */
WDOG_STCTRLH = WDOG_STCTRLH_DISTESTWDOG_MASK |
                 WDOG_STCTRLH_BYTESEL(0x00) |
                 WDOG_STCTRLH_WAITEN_MASK |
                 WDOG_STCTRLH_STOPEN_MASK |
                 WDOG_STCTRLH_IRQRSTEN_MASK |
                 WDOG_STCTRLH_CLKSRC_MASK |
                 WDOG_STCTRLH_WDOGEN_MASK |
                 0x0100U;              /* Setup control register */
/* {MQX RTOS Adapter} Critical section ends (RTOS function call is defined by MQX RTOS Adapter property) */
_int_enable();
/* Registration of the device structure */
PE_LDD_RegisterDeviceStructure(PE_LDD_COMPONENT_WDog1_ID,DeviceDataPrv);
return ((LDD_TDeviceData *)DeviceDataPrv); /* Return pointer to the device data structure */
}

Where is the interrupt routine for INT_Watchdog? Do I have to install myself?

In the example, watchdog.c under mqx example folder, it shows a watchdog test using system timer as watchdog. It can call interrupt when specified time duration expires. It can be added with a CPU reset in the ISR(). To me, this is the same as watchdog timer defined with interrupt and then reset CPU. What are essential difference between Watchdog timer and a system timer is used as watchdog function?

Thank you,

David Zhou

Re: Watchdog Interrupt

danielchen — Sat, 04 Feb 2017 15:15:01 GMT

Hi David:

The difference you mentioned is just like the difference between hardware watchdog and software watchdog.

Hardware watchdog: If the application does not reset the timer within a certain time, the hardware generates a reset operation. As such, a hardware watchdog timer monitors the entire application on a processor, it does not monitor individual tasks.

Software watchdog: The MQX RTOS watchdog component provides a software watchdog for each task. If a single task starves or runs beyond certain timing constraints, the watchdog provides a way to detect the problem. Initially, the task stars its watchdog with a specific time value, and if the task fails to stop or restart the watchdog before that time expires, MQX RTOS calls a processor-unique, application-supplied expiry function that can initiate error recovery.

Regarding the hardware watchdog, please refer to the attached Kinetis watchdog module validation code. I did not try the watchdog PE code before.

Regarding the software watchdog, please refer to the watchdog demo under MQX installation folder.

C:\Freescale\Freescale_MQX_4_2\mqx\examples\watchdog

Regards

Daniel

Re: Watchdog Interrupt

davidzhou — Mon, 06 Feb 2017 19:59:09 GMT

Thank you, Daniel.

David Zhou

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