104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
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/*
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* Test on how to create a digital_write() function. Leds at PORTD2..6
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* (Arduino digital 2..6) with 220 ohm resistors on positive leg.
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*
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* Led at Arduino digital 13 (PORTB5). Cause we all love blinken leds!
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*
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* To compile and upload run: make clean; make; make program
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*
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* Copyright 2011 Mika Tuupola
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*
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* Licensed under the MIT license:
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* http://www.opensource.org/licenses/mit-license.php
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*
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*/
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#ifndef F_CPU
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#define F_CPU 16000000UL
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#endif
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#include <stdlib.h>
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#include <avr/io.h>
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#include <stdio.h>
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#include <util/delay.h>
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#include <stdint.h>
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#include <avr/sfr_defs.h>
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#include "main.h"
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#include "uart.h"
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void init(void) {
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/* Make PORTD2..6 (Arduino digital 2..6) output by setting bits in DDR */
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DDRD |= (_BV(PORTD2) | _BV(PORTD3) | _BV(PORTD4) | _BV(PORTD5) | _BV(PORTD6));
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/* Make PORTB5 (Arduino digital 13) an output by setting bit in DDR. */
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DDRB |= _BV(PORTB5);
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}
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int digital_read(int input_register, int pin) {
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return bit_is_set(input_register, pin) != 0 ? 1 : 0;
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}
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/* You could use cbi ie &= ~ or sbi ie |= but this makes code more readable. */
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void digital_write(volatile int *data_port, int pin, int value) {
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if (0 == value) {
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*data_port &= ~(_BV(pin));
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} else {
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*data_port |= _BV(pin);
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}
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}
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int main(void) {
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init();
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uart_init();
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stdout = &uart_output;
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stdin = &uart_input;
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while (1) {
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/* Blink led by toggling state of PORTB5 (Arduino digital 13). */
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PORTB ^= _BV(PORTB5);
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puts("Light PIND2");
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/*PORTD &= ~(_BV(PORTD6));
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PORTD |= _BV(PORTD2);*/
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digital_write(&PORTD, PORTD6, 0);
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digital_write(&PORTD, PORTD2, 1);
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_delay_ms(100);
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puts("Light PIND3");
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/*PORTD &= ~(_BV(PORTD2));
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PORTD |= _BV(PORTD3);*/
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digital_write(&PORTD, PORTD2, 0);
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digital_write(&PORTD, PORTD3, 1);
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_delay_ms(100);
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puts("Light PIND4");
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/*PORTD &= ~(_BV(PORTD3));
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PORTD |= _BV(PORTD4);*/
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digital_write(&PORTD, PORTD3, 0);
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digital_write(&PORTD, PORTD4, 1);
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_delay_ms(100);
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puts("Light PIND5");
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/*PORTD &= ~(_BV(PORTD4));
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PORTD |= _BV(PORTD5);*/
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digital_write(&PORTD, PORTD4, 0);
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digital_write(&PORTD, PORTD5, 1);
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_delay_ms(100);
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puts("Light PIND6");
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/*PORTD &= ~(_BV(PORTD5));
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PORTD |= _BV(PORTD6);*/
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digital_write(&PORTD, PORTD5, 0);
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digital_write(&PORTD, PORTD6, 1);
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_delay_ms(100);
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}
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return 0;
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}
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