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Original question:

MSP430FR5994: Does a legal access to the WDT cause SYSRSTIV_WDTPW to be set?

MSP430FR5949: MSP430FR5949

santhosh prem
Expert 1385 points
Part Number: MSP430FR5949

It is working perfectly but i have some doubt in this SYSRSTIV comes 0x0016 when we come of the ieration but after if condition SYSTSTIV comes like 0x000 why? can you please explain 

#include <msp430.h>

int main(void) {
// WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer

if (SYSRSTIV ==SYSRSTIV_WDTTO) {

switch(SYSRSTIV_WDTTO){
case SYSRSTIV_NONE: /* No Interrupt pending */
_no_operation();
break;
case SYSRSTIV_BOR : /* SYSRSTIV : BOR */
_no_operation();
break;
case SYSRSTIV_RSTNMI: /* SYSRSTIV : RST/NMI */
_no_operation();
break;
case SYSRSTIV_DOBOR: /* SYSRSTIV : Do BOR */
_no_operation();
break;
case SYSRSTIV_LPM5WU: /* SYSRSTIV : Port LPM5 Wake Up */
_no_operation();
break;
case SYSRSTIV_SECYV : /* SYSRSTIV : Security violation */
_no_operation();
break;
case SYSRSTIV_RES0C: /* SYSRSTIV : Reserved */
_no_operation();
break;
case SYSRSTIV_SVSHIFG: /* SYSRSTIV : SVSHIFG */
_no_operation();

break;
case SYSRSTIV_RES10: /* SYSRSTIV : Reserved */
_no_operation();
break;
case SYSRSTIV_RES12: /* SYSRSTIV : Reserved */
_no_operation();
break;
case SYSRSTIV_DOPOR: /* SYSRSTIV : Do POR */
_no_operation();
break;
case SYSRSTIV_WDTTO: /* SYSRSTIV : WDT Time out */
_no_operation();
break;
case SYSRSTIV_WDTKEY: /* SYSRSTIV : WDTKEY violation */
_no_operation();
break;
case SYSRSTIV_FRCTLPW: /* SYSRSTIV : FRAM Key violation */
_no_operation();
break;
case SYSRSTIV_UBDIFG: /* SYSRSTIV : FRAM Uncorrectable bit Error */
_no_operation();
break;
case SYSRSTIV_PERF: /* SYSRSTIV : peripheral/config area fetch */
_no_operation();
break;
case SYSRSTIV_PMMPW: /* SYSRSTIV : PMM Password violation */
_no_operation();
break;
case SYSRSTIV_MPUPW: /* SYSRSTIV : MPU Password violation */
_no_operation();
break;
case SYSRSTIV_CSPW: /* SYSRSTIV : CS Password violation */
_no_operation();
break;
case SYSRSTIV_MPUSEGPIFG: /* SYSRSTIV : MPUSEGPIFG violation */
_no_operation();
break;
case SYSRSTIV_MPUSEGIIFG: /* SYSRSTIV : MPUSEGIIFG violation */
_no_operation();
break;
case SYSRSTIV_MPUSEG1IFG: /* SYSRSTIV : MPUSEG1IFG violation */
_no_operation();
break;
case SYSRSTIV_MPUSEG2IFG: /* SYSRSTIV : MPUSEG2IFG violation */
_no_operation();
break;
case SYSRSTIV_MPUSEG3IFG: /* SYSRSTIV : MPUSEG3IFG violation */
_no_operation();
break;
case SYSRSTIV_ACCTEIFG: /* SYSRSTIV : ACCTEIFG access time error */
_no_operation();
break;
default:

break;
}
}
while(1);
}

  • 0
    TI__Mastermind 38185 points

    Hi Santhosh

    By default the WDT's time-out interval is Watchdog clock source / 2^15. When you first power on it the SYSRSTIV  should not be 0x0016.

    Best regards

    Gary 

  • 0 in reply to Gary Gao
    Expert 1385 points

    Thank for your reply. when I first power on it the SYSRSTIV comes like 0x0004 and by using the debugger I went  to (Breakpoint) if condition now SYSRSTIV becomes 0x000 since the condition is not true it goes to while and I pressed run button it goes if condition again since I placed the breakpoint in if condition now SYSRSTIV is 0x0016. but when if condition is successfully completed after that it comes like SYSRSTIV 0x0000 why?

  • 0 in reply to santhosh prem
    Guru 95350 points

    > if (SYSRSTIV ==SYSRSTIV_WDTTO) {

    Reading SYSRSTIV resets the relevant flag. In general, reading it twice will give you different values. When it runs out of flags, it returns 0. [Ref User Guide (SLAU367O) Sec 1.3.7]

    > switch(SYSRSTIV_WDTTO){

    This switch() is using a constant (=0x16) as a tag. This is (almost) never useful. Is that what you intended?

  • 0 in reply to Bruce McKenney
    Expert 1385 points

    Thank so much for the reply, I got some idea from what you have said. But I  have some doubt in SYSRSTIV why because when I have rested my device it hanged suddenly. I don't why? so I started to analyze SYSRSTIV 

    switch(__even_in_range(SYSRSTIV , SYSRSTIV_ACCTEIFG)){
    case SYSRSTIV_NONE: // No interrupt pending
    _no_operation();
    break;
    case SYSRSTIV_BOR : // SYSRSTIV : BOR
    _no_operation();
    break;
    case SYSRSTIV_RSTNMI: //SYSRSTIV : RST/NMI(BOR)
    _no_operation();
    break;
    case SYSRSTIV_DOBOR: //SYSRSTIV : Do BOR
    _no_operation();
    break;
    case SYSRSTIV_LPM5WU: //SYSRSTIV : Port LPM5 Wake Up(BOR)
    _no_operation();
    //__bis_SR_register(LPM4_bits);
    break;
    case SYSRSTIV_SECYV : //SYSRSTIV : Security violation(BOR)
    _no_operation();
    break;
    case SYSRSTIV_RES0C: //SYSRSTIV : SVSHIFG
    _no_operation();
    break;
    case SYSRSTIV_SVSHIFG: // SYSRSTIV : Do POR
    _no_operation();

    break;
    case SYSRSTIV_RES10: // SYSRSTIV : WDT Time out
    _no_operation();
    break;
    case SYSRSTIV_RES12: //SYSRSTIV : WDTKEY violation
    _no_operation();
    break;
    case SYSRSTIV_DOPOR: // SYSRSTIV : FRAM Key violation
    _no_operation();
    break;
    case SYSRSTIV_WDTTO: //SYSRSTIV : FRAM Uncorrectable bit Error
    _no_operation();
    break;
    case SYSRSTIV_WDTKEY: // SYSRSTIV : peripheral/config area fetch
    _no_operation();
    break;
    case SYSRSTIV_FRCTLPW: // SYSRSTIV : PMM Password violation
    _no_operation();
    break;
    case SYSRSTIV_UBDIFG: //SYSRSTIV : MPU Password violation
    _no_operation();
    break;
    case SYSRSTIV_PERF: // SYSRSTIV : CS Password violation
    _no_operation();
    break;
    case SYSRSTIV_PMMPW: //SYSRSTIV : MPUSEGPIFG violation
    _no_operation();
    break;
    case SYSRSTIV_MPUPW: //SYSRSTIV : MPUSEGIIFG violation
    _no_operation();
    break;
    case SYSRSTIV_CSPW: //SYSRSTIV : MPUSEG1IFG violation
    _no_operation();
    break;
    case SYSRSTIV_MPUSEGPIFG: // SYSRSTIV : MPUSEG2IFG violation
    _no_operation();
    break;
    case SYSRSTIV_MPUSEGIIFG: // SYSRSTIV : MPUSEG3IFG violation
    _no_operation();
    break;
    case SYSRSTIV_MPUSEG1IFG: //SYSRSTIV : ACCTEIFG access time error
    _no_operation();
    break;
    case SYSRSTIV_MPUSEG2IFG: //SYSRSTIV : ACCTEIFG access time error
    _no_operation();
    break;
    case SYSRSTIV_MPUSEG3IFG: // SYSRSTIV : ACCTEIFG access time error
    _no_operation();
    break;
    case SYSRSTIV_ACCTEIFG: //SYSRSTIV : ACCTEIFG access time error
    _no_operation();
    break;
    default:

    break;
    }

    In this code i want to go through each INTERRUPT EVENT and  i  i want to know when it is going  SYSRSTIV : BOR,SYSRSTIV : SVSHIFG etc can you please help so that it will be very useful for me.Thank you so much for you fast reply

  • 0 in reply to santhosh prem
    TI__Mastermind 38185 points

    Hi 

    You can do your work like this 

    unsigned short reset_event;

    reset_event=SYSRSTIV ;

    switch(reset_event)

    {

    case SYSRSTIV_NONE: // No interrupt pending
    //toggle the LED once;
    break;
    case SYSRSTIV_BOR : // SYSRSTIV : BOR
    //toggle the LED twice ;
    break;
    case SYSRSTIV_RSTNMI: //SYSRSTIV : RST/NMI(BOR)
    //toggle the LED three times
    break;

    ....

    }

    So you can know the reset event by the LED signals.

    Best regards

    Gary

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