#include <msp430g2553.h>

#define DATA BIT0 //DS 1.0
#define CLOCK BIT4 // SH_CP 1.4
#define LATCH BIT5 // ST_CP 1.5
#define ENABLE BIT6 // OE 1.6
#define BUTTON BIT3 // BP 1.3

//Declaration des prototypes de fonctions
void delay(unsigned int ms);
void enable(void);
void shiftOut(unsigned char val);
void pinWrite(unsigned int bit, unsigned char val);
void pulseClock(void);


void main(void) {
	WDTCTL = WDTPW + WDTHOLD;			//stop watchdog
	P1DIR |= (DATA + CLOCK + LATCH + ENABLE);	//mise en sortie
	
	P1IE |= BUTTON;			//generer les interruption pour 1.3
	P1SEL &= ~BUTTON;		//selection du BUTTON
	P1DIR &= ~BUTTON;		//passage en mode input
	P1REN |= BUTTON;		//activer res pull-up

	_BIS_SR(GIE);			// Enable interrupts

	P1OUT &= ~ENABLE;		//activer le OE sur shift
	int i;
	for(;;) {

		for(i=0; i<8; i++) {
			shiftOut(1 << i);
			delay(50);
		}
	
		for(i=7; i>0; i--) {
			shiftOut(1 << i);
			delay(15);
		}

	}


}

void delay(unsigned int ms) {
	while(ms--) {
		__delay_cycles(1000);
	}
}

void shiftOut(unsigned char val) {

	P1OUT &= ~LATCH;

	int i;

	for(i=0; i<8; i++) {
		pinWrite(DATA, (val & (1 << i)));
		pulseClock();
	}

	P1OUT |= LATCH;
	P1OUT &= ~LATCH;

}

void pinWrite(unsigned int bit, unsigned char val) {
	if(val) P1OUT |= bit;
	else P1OUT &= ~bit;
}

void pulseClock(void) {
	P1OUT |= CLOCK;
	P1OUT &= ~CLOCK;
}


#pragma vector=PORT1_VECTOR
      __interrupt void Port_1(void) {

      	P1IFG &= ~BUTTON;			// P1.3 Interrupt Flag cleared
	P1OUT ^= ENABLE;
}