AVR ATMEGA32 watchdog problem

[vikas]

#include <avr/io.h>

#include <avr/signal.h>

#include <util/delay.h>

#include <avr/eeprom.h>

 

#define F_CPU 12000000UL

void COUNT_PULSES(void);

void PULSE_OUT(void);

 

unsigned int PULSES1=0;

float PULSES=45;

float PULSES2=45;

int FLAG=0;

int FLAG1=0;

char lcd_buffer[20];

unsigned int ech EEMEM=0;

 

int main()

{

 

TCNT1H=0x00;

TCNT1L=0x00;

ICR1H=0x00;

ICR1L=0x00;

OCR1AH=0x00;

OCR1AL=0x00;

OCR1BH=0x00;

OCR1BL=0x00;

TCCR1A=0b00000000;

TCCR1B=0b00000111;   //SELECT CLOCK HRER CS

  

// Port A initialization

PORTA=0x00; //ACD

DDRA=0x00; //input

// Port B initialization

PORTB=0x00; //PUSH BUTTONS

DDRB=0x00; //input

// Port C initialization

DDRC=0xFF; //LCD

PORTC=0x00; //output

// Port D initialization

PORTD=0x00;

DDRD=0x00; //INPUT

 

    // Watchdog Timer initialization

    // Watchdog Timer Prescaler: OSC/256k

 

  WDTCR=0b00011111;

//WDTCR=0b00001111;

 

_delay_ms(8000);

 

TIMSK=0b00000100; 

  sei();

 

//READ FROM THE 

 

PULSES2 = (unsigned int) eeprom_read_word((uint16_t *) 10);

_delay_us(20);

WDTCR=0b00011111;

WDTCR=0b00001111;

 

while(1)

{

 

if((PINA & 0x01) != 0 && FLAG1==0 )

{

FLAG1=1;

TCNT1=0;

COUNT_PULSES();

}

else 

{

if((PINB & 0x01) != 0 && FLAG==0)

{

if((PINB & 0x01) != 0)

{

FLAG=1;

PULSE_OUT();   //pulse out 1 or 2

WDTCR=0b00011111;

WDTCR=0b00001111;

 

_delay_ms(100);

FLAG=0;

}

 

}

}

 

_delay_ms(10);

 

WDTCR=0b00011111;

WDTCR=0b00001111;

}

return 0;

}

 

 

 

void COUNT_PULSES()

{

   

   WDTCR=0b00011111;

WDTCR=0b00001111;

 

_delay_ms(1500);

WDTCR=0b00011111;

WDTCR=0b00001111;

 

PULSES=TCNT1;

PULSES2= PULSES;

if (PULSES2 > 4)

  {

eeprom_write_word ((uint16_t *) 10, (uint16_t)PULSES2); 

_delay_us(20);

}

else

{

PULSES2 = (unsigned int) eeprom_read_word((uint16_t *) 10);

_delay_us(20);

}

 

WDTCR=0b00011110;

WDTCR=0b00001110;

 

while((PINA & 0x01) != 0 )

{

_delay_ms(5);

WDTCR=0b00011110;

WDTCR=0b00001110;

 

}

FLAG1=0;

}

 

 

 

 

void PULSE_OUT()

{

 

  

PULSES2 = (unsigned int) eeprom_read_word((uint16_t *) 10);

_delay_us(10);

PULSES= PULSES2;

WDTCR=0b00011111;

WDTCR=0b00001111;

if (PULSES == 0)

{

__asm__ __volatile__( “SBI  0x15,2” );     // 2 cycles

  

_delay_us(10);

 

__asm__ __volatile__( “CBI  0x15,2” );    // 2 cycles

}

else if (PULSES > 0 && PULSES < 10)

{

    __asm__ __volatile__( “SBI  0x15,2” );    // 2 cycles

  

_delay_us(20);

 

__asm__ __volatile__( “CBI  0x15,2” );    // 2 cycles

}

else if (PULSES == 10)

{

    __asm__ __volatile__( “SBI  0x15,2” );    // 2 cycles

  

_delay_us(1);

 

__asm__ __volatile__( “SBI  0x15,4” );    // 2 cycles

 

_delay_us(20);

 

__asm__ __volatile__( “CBI  0x15,2” );    // 2 cycles

__asm__ __volatile__( “CBI  0x15,4” );    // 2 cycles

}
             else
            {
           __asm__ __volatile__( “SBI  0x15,2” );    // 2 cycles

  

_delay_us(1);

 

__asm__ __volatile__( “SBI  0x15,4” );    // 2 cycles

 

_delay_us(20);

 

__asm__ __volatile__( “CBI  0x15,2” );    // 2 cycles

__asm__ __volatile__( “CBI  0x15,4” );    // 2 cycles

}
}

---

I am not getting the pulses defined in the PULSE_OUT() function.
Input to controllers are fine. Code is working accordingly without the watchdog.
Watchdog is of 2 sec.
EEPROM is working.
With watchdog, just not getting pulses (in asm code pulse_out()).
Can anybody trace the bug?

Thanks
 

[GANEEV SINGH]

Hi Vikas 

I do not see watchdog timer being disabled anywhere in this code. What you are doing is you are clearing off the WDTOE bit everytime you write the second command i.e. WDTCR=0b00001111; rather you should write WDTCR=0b00010111;

For further understanding, I will suggest you to go through with Atmega32's datasheet and especially the WACHDOG TIMER stuff.

Hope this helps

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