Program returns to its main point unexpectedly at Pic C in MPlab

问题

I'm programming a stepper motor with PIC16F84 in MPlab IDE. My program returns it's starting point after I call it's delay method. To be more spesific, some of code snippets here.

main method to drive program

int main(int argc, char** argv) {
TRISB = 0; // PORT B as output port
PORTB = 0x0F;

stepForward(25);
activateRelay();
waitForSeconds(3000);
deActivateRelay();
stepBackward(50);
//Since step forward method steps for 100, this will return to initial state
stepForward(25);

return (EXIT_SUCCESS);
}

Step forward method

void stepForward(unsigned int stepCount){
while(0 < stepCount) {
    PORTB = 0b00000001;
    waitForSeconds(500);
    PORTB = 0b00000010;
    waitForSeconds(500);
    PORTB = 0b00000100;
    waitForSeconds(500);
    PORTB = 0b00001000;
    waitForSeconds(500);
    stepCount--;
    }
}

And the method for delaying system

void waitForSeconds(unsigned int miliSeconds){
    //DelayUs(miliSeconds);
    for(;miliSeconds > 0; miliSeconds--)
         for(unsigned short x = 333; x > 0 ; x--){
         }
}

After the second waitFor method called from stepForward method, program returns into TRISB = 0; part of the main method.

I'm new at pic programming, so my fault would be very easy one. I'm looking for help. Thanks.

回答1:

If the program counter jumps back to 0 unexpectedly, the PIC is resetting. There are many causes of reset, depending on the PIC. A common one is watchdog timeout, and you don't seem to be kicking the watchdog, so have you disabled it in the config bits? Status register bit 4 will tell you if a watchdog timeout occurred.

来源：https://stackoverflow.com/questions/23085280/program-returns-to-its-main-point-unexpectedly-at-pic-c-in-mplab

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