Kinetis MicrocontrollersのトピックRe: Watchdog cannot be disabled after watchdog timeout reset

Watchdog cannot be disabled after watchdog timeout reset

gsmgbl — Thu, 29 Dec 2016 01:02:21 GMT

Hi, I tried to follow the cop example project to use the watchdog, but I noticed the COP_Disable(SIM); works fine in the example project. So now, I would like to flash my LED after watchdog timeout reset, then clear the watchdog timeout flag, then restart the watchdog, it didn't work on my project unfortunately. I found that the COP_Disable(SIM); won't disable the COP, plus the SIM_COPC_COPT did not change, this bit won't change even i write into the register directly.

All I want is to turn my LEDs indication to represent the different stage of watchdog process as follow:

Normal running: Red ON, Green OFF

After watchdog reset: Both Red and Green ON

watchdog flags are cleared and COP restarted: Red OFF, Green ON

Please see my code below and comments. Thank you.

if (RCM_GetPreviousResetSources(RCM) & kRCM_SourceWdog)
{
COP_Disable(SIM);
LED_RED_ON();
LED_GREEN_ON();
RCM_ClearStickyResetSources(RCM, kRCM_SourceWdog);
COP_Init(SIM, &configCop);
LED_RED_OFF();
LED_GREEN_ON();
}
else
{
// If WDOG reset is not occurred, enables COP
COP_Refresh(SIM);
LED_RED_ON();
LED_GREEN_OFF();
}

Regards,

Gilbert

Re: Watchdog cannot be disabled after watchdog timeout reset

xiangjun_rong — Thu, 29 Dec 2016 03:35:06 GMT

Hi,

Do you pay attention to the fact that the SIM_COPC register can be written only once after Reset?

Hope it can help you

XiangJun Rong

Re: Watchdog cannot be disabled after watchdog timeout reset

gsmgbl — Thu, 29 Dec 2016 16:34:40 GMT

Yes, i found that after i sent this question.

if this is the case, then how could I clear the WDOG flag on both RCM_SRS0 and RCM_SSRS0 registers?

As you may see my code, I use the RCM_ClearStickyResetSources(RCM, kRCM_SourceWdog); to clear the flags, but the WDOG show up the next loop. Plus the RCM_SRS0 is read only, is it clear only at POR?

Please kindly advise. Thank you.