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128 pfowler 1 
/*
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 * hc595.c
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 *
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 *  Created on: 16/07/2014
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 *      Author: pfowler
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 */
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#include <avr/io.h>
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#include <avr/wdt.h>
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#include <avr/interrupt.h>
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#include <string.h>
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#include <util/delay.h>
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#include <stdlib.h>
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#include "config.h"
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#include "hc595.h"
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#include "avrutil.h"
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// The delay to use after sending the store line pulse
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#define HC595_STCP_DELAY		1
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/*
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 * Configure the 595 pins as outputs
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 */
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void hc595_init() {
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	HC595_DDR|=((1<<HC595_SHCP_PIN)|(1<<HC595_STCP_PIN)|(1<<HC595_DS_PIN));
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}
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/*
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 * Pulse the clock line
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 */
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void hc595_pulse() {
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	sbi(HC595_PORT, HC595_SHCP_PIN);
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	cbi(HC595_PORT, HC595_SHCP_PIN);
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}
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/*
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 * Pulse the store line
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 */
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void hc595_latch() {
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	sbi(HC595_PORT, HC595_STCP_PIN);
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	//_delay_us(HC595_STCP_DELAY);
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	cbi(HC595_PORT, HC595_STCP_PIN);
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}
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void hc595_write(uint8_t data) {
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	uint8_t i;
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	for (i = 0; i<8; i++) {
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		if (rbi(data, i))
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			sbi(HC595_PORT, HC595_DS_PIN);
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		else
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			cbi(HC595_PORT, HC595_DS_PIN);
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		hc595_pulse();
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	}
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	hc595_latch();
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}