AVR Timer Interrupts
    Revision as of 14:51, 22 March 2016 by Raghavendra (Talk | contribs)

    Basics

    TIMSK
    Timer/Counter Interrupt Mask Register
    D7 D6 D5 D4 D3 D2 D1 D0
    - - TICIE1 OCIE1A OCIE1B TOIE1 - -

    Code

    #include<avr/io.h>
    #include<avr/interrupt.h>
    #define LED PD4
    ISR (TIMER1_OVF_vect) // Timer1 ISR
    {
    PORTD ^= (1 << LED);
    TCNT1H=0xF9; // Reload the 16-bit count value
    TCNT1L=0xE6; // in timer1 count registers
    }
    int main()
    {
    DDRD = (0x01 << LED); //Configure the PORTD4 as output
    TCNT1=63976; // for 1 sec at 16 MHz
    TCCR1A = 0x00;
    TCCR1B = (1<<CS10) | (1<<CS12);; // Timer mode with 1024 prescler
    TIMSK = (1 << TOIE1) ; // Enable timer1 overflow interrupt(TOIE1)
    sei(); // Enable global interrupts by setting global interrupt enable bit in SREG
    while(1)
    {
    }
    }
    view raw Atmega32TimerInterrupt1Example.c hosted with ❤ by GitHub



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