MSP430_LedMatrix/main.c

#include <msp430g2553.h>
#include "char.c"

// 74HC Pins
#define DATA BIT0 //DS 1.0
#define CLOCK BIT4 // SH_CP 1.4
#define LATCH BIT5 // ST_CP 1.5

//4017 Pins
#define CLOCKCP	BIT6	// Clock 1.2
#define RESET	BIT3	// Reset 1.3


//Declaration des prototypes de fonctions
void pushRegister(int val);
void pinWrite(int bit, int val);
void clearAll(void);

//Declaration des vaiables
unsigned int DisplayBuffer[]={0,0,0,0,0,0,0,0};
unsigned int speed;
short i, l, k, ShiftAmount, scroll, temp, shift_step=1;
char message[]="Powered by MSP430";
char index;


void clearAll(void) {
	int i;
	P1OUT |= RESET;
	P1OUT &= ~RESET;

	P1OUT &= ~LATCH;
	for(i=0; i<8; i++) {
		pinWrite(DATA, 0);
		P1OUT |= CLOCK;
		P1OUT &= ~CLOCK;
	}
	P1OUT |= LATCH;
}


void main(void) {
	WDTCTL = WDTPW + WDTHOLD;				//stop watchdog
	P1DIR |= (DATA + CLOCK + LATCH + CLOCKCP + RESET);	//mise en sortie

	clearAll();

	while(1) {

		for(k=0; k<strlen(message); k++) {
			for(scroll=0; scroll<(8/shift_step); scroll++) {
				for(ShiftAmount=0; ShiftAmount<8; ShiftAmount++) {
					index = message[k];
					temp = CharData[index-32][ShiftAmount];
					DisplayBuffer[ShiftAmount] = (DisplayBuffer[ShiftAmount] << shift_step) | (temp >> ((8-shift_step)-scroll*shift_step));

				}
				speed = 15;
				for(l=0; l<speed; l++) {
					for(i=0; i<8; i++) {
						pushRegister(DisplayBuffer[i]);
					}
					P1OUT |= RESET;
					P1OUT &= ~RESET;

				}
			}
		}

	}

}

void pushRegister(int val) {

	P1OUT &= ~LATCH;

	int i;

	for(i=8; i>0; i--) {
		pinWrite(DATA, (val & (1 << i)));
		P1OUT |= CLOCK;		//clock 74HC
		P1OUT &= ~CLOCK;
	}

	P1OUT |= LATCH;
	P1OUT &= ~LATCH;
	
	for(i=0; i<8; i++) {
		pinWrite(DATA, 0);
		P1OUT |= CLOCK;		//clock 74hc
		P1OUT &= ~CLOCK;
	}

	P1OUT |= LATCH;
	P1OUT |= CLOCKCP;		//clock 4017
	P1OUT &= ~CLOCKCP;


}

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