Matthias Kleemann mkleemann

mkleemann / AVR_sleep_and_wakeup.c

Created January 31, 2012 18:52

ATmega8 power down and wakeup example

	/* ATmega8 with internal 4Mhz clock (6cycle + 64ms) */

	#include <avr/io.h>
	#include <avr/sleep.h>
	#include <avr/interrupt.h>
	#include <util/delay.h>

	int main(void)
	{
	DDRC \|= (1 << PC2) \| (1 << PC1); // leds for testing

mkleemann / atmega8_timer0.c

Created January 2, 2012 20:52

atmega8 timer0 - use overflow interrupt

	// All values/comments are valid with ATmega8 running at Fosc = 4.000MHz

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

	// TIMER0 with prescaler clkI/O/1024
	#define TIMER0_PRESCALER (1 << CS02) \| (1 << CS00)


	void main()

mkleemann / atmega8_timer1.c

Created January 2, 2012 20:51

atmega8 timer1 - use 16-bit compare with ICR (input capture interrupt) for long periods of time

	// All values/comments are valid with ATmega8 running at Fosc = 4.000MHz

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

	// TIMER1 with prescaler clkI/O/1024
	#define TIMER1_PRESCALER (1 << CS12) \| (1 << CS10)

	// ~15s (4MHz@1024 prescale value)
	#define TIMER1_COMPARE_VALUE 0xE4E1

mkleemann / atmega8_timer2.c

Created January 2, 2012 20:49

atmega8 timer2 - use CTC/output compare interrupt w/o usage of OC2 pin

	// All values/comments are valid with ATmega8 running at Fosc = 4.000MHz

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

	// TIMER2 with prescaler clkT2S/1024
	#define TIMER2_PRESCALER (1 << CS22) \| (1 << CS21) \| (1 << CS20)

	// TIMER2 output compare value
	// --> value 98 is 25.088ms (4MHz@1024 prescale factor)