Subversion Repositories group.electronics

/*
 * hc595.c
 *
 *  Created on: 16/07/2014
 *      Author: pfowler
 */

#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
#include <string.h>
#include <util/delay.h>
#include <stdlib.h>

#include "config.h"
#include "hc595.h"
#include "avrutil.h"

// The delay to use after sending the store line pulse
#define HC595_STCP_DELAY                1

/*
 * Configure the 595 pins as outputs
 */
void hc595_init() {
        HC595_DDR|=((1<<HC595_SHCP_PIN)|(1<<HC595_STCP_PIN)|(1<<HC595_DS_PIN));
}

/*
 * Pulse the clock line
 */
void hc595_pulse() {
        sbi(HC595_PORT, HC595_SHCP_PIN);
        cbi(HC595_PORT, HC595_SHCP_PIN);
}

/*
 * Pulse the store line
 */
void hc595_latch() {
        sbi(HC595_PORT, HC595_STCP_PIN);
        //_delay_us(HC595_STCP_DELAY);
        cbi(HC595_PORT, HC595_STCP_PIN);
}

void hc595_write(uint8_t data) {
        uint8_t i;
        for (i = 0; i<8; i++) {
                if (rbi(data, i))
                        sbi(HC595_PORT, HC595_DS_PIN);
                else
                        cbi(HC595_PORT, HC595_DS_PIN);
                hc595_pulse();
        }
        hc595_latch();
}