AVRFreaks.net

unsigned volatile int verticalspeed=0;
int volatile reference=0;
int volatile altitudeR_int=0;

int main(void)
{
// initialise interrupt here
while(1)     
{
// at here the [b]altitudeR_int [/b] changes according to our sensor


printf("Pump ON \n" );
printf("Altitude= %d ft \n", altitudeR_int);
printf("reference= %d mb \n",reference);
printf("verticalspeed:%u ", verticalspeed);
}

}


ISR(TIMER1_COMPA_vect)
{
verticalspeed=((altitudeR_int-reference)*60);
      
reference = altitudeR_int;
     
}

volatile unsigned int verticalspeed = 0;
volatile int reference=0;
volatile int altitudeR_int=0;

int main(void)
{
// initialise interrupt here
while(1)     
{
// at here the [b]altitudeR_int [/b] changes according to our sensor

cli(); // Read in the globals here with interrupts disabled to prevent the ISR from updating them while reading the values
unsigned int verticalspeed_LCL = verticalspeed;
int reference_LCL = reference;
int altitudeR_int_LCL = altitudeR_int;
sei();

printf("Pump ON \n" );
printf("Altitude= %d ft \n", altitudeR_int_LCL);
printf("reference= %d mb \n",reference_LCL);
printf("verticalspeed:%u ", verticalspeed_LCL);
}

}


ISR(TIMER1_COMPA_vect)
{
verticalspeed=((altitudeR_int-reference)*60);
     
reference = altitudeR_int;
     
}

uint8_t SREG_Save = SREG;
cli();
// Atomic variable access here
SREG = SREG_Save;

int main (void)
{   
   TCCR1A= (1 << WGM12);             TCCR1B = 0x04;   // prescaler 256      
   TIMSK |= (0 << OCIE1A);    disable the interrupt            
   sei(); //  Enable global interrupts

function1(); //
function2(); // interrupt start and end here
funciotn3(); //
}

function2()
{

                TIMSK |= (1 << OCIE1A);
      OCR1A  = 625;     // we set the 20ms  interrupt here    
while(1)     
{
// at here the [b]altitudeR_int [/b] changes according to our sensor

cli(); // Read in the globals here with interrupts disabled to prevent the ISR from updating them while reading the values
unsigned int verticalspeed_LCL = verticalspeed;
int reference_LCL = reference;
int altitudeR_int_LCL = altitudeR_int;
sei();

printf("Pump ON \n" );
printf("Altitude= %d ft \n", altitudeR_int_LCL);
printf("reference= %d mb \n",reference_LCL);
printf("verticalspeed:%u ", verticalspeed_LCL);
}
   TIMSK |= (0 << OCIE1A);  // disable CTC interrupt 
}

ISR(TIMER1_COMPA_vect)
{
verticalspeed=((altitudeR_int-reference)*60);
     
reference = altitudeR_int;
     
}

TIMSK |= (0 << OCIE1A);    disable the interrupt

TIMSK &= ~(1 << OCIE1A);    disable the interrupt

#include <avr/io.h>
#include "fuelgauge.h"


void main(void)
{

  unsigned char counter;

  init();              // Initialize the controller

  TCCR0A |=  (1<< WGM01) | (0 << WGM00);

  OCR0A= 0xFF;
 
  TCCR0B |= ((0 << CS02) | (0 << CS01) | (1 << CS00)); // Set up timer at Fcpu/1024

 
  for (;;)
   {

   counter=TCNT0;


   if (TIFR0 & (1 << OCF0A))
      {
          PINB = 0x07; // Toggle the LED

          TIFR0 = (1 << OCF0A);

      }

   }

}

void init(void)
{

  CLKPR = (1 << CLKPCE);
  CLKPR = 0;


  DDRB = (1 << PB0) | (1 << PB1) | (1 << PB2) | (1 << PB4) ;
  PORTB = (1<<PB0)|(1<<PB1)|(1<<PB2);
  PINB = 0x00;
}

#include <avr/io.h>
#include <avr/interrupt.h>

int main (void)
{
   DDRB |= (1 << 0); // Set LED as output

   TCCR1B |= (1 << WGM12); // Configure timer 1 for CTC mode

   TIMSK |= (1 << OCIE1A); // Enable CTC interrupt

   sei(); //  Enable global interrupts

   OCR1A   = 15625; // Set CTC compare value to 1Hz at 1MHz AVR clock, with a prescaler of 64

   TCCR1B |= ((1 << CS10) | (1 << CS11)); // Start timer at Fcpu/64

   for (;;)
   {

   }
}

ISR(TIMER1_COMPA_vect)
{
   PORTB ^= (1 << 0); // Toggle the LED
}