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