Notes

#include <msp430.h>
#define DATAPIN BIT0
#define CLOCKPIN BIT2
#define LATCHPIN BIT1
#define DATAPIN2 BIT3
#define LATCHPIN2 BIT4
#define LATCHPIN3 BIT5
#define DATAPIN3 BIT6

void shiftOut(char data);

void shiftOut2(char data2);

void shiftOut3(char data3);

void main() {

WDTCTL = WDTPW + WDTHOLD; // kill WDT
P1OUT = 0x00;
P1DIR = DATAPIN + CLOCKPIN + LATCHPIN + DATAPIN2 + LATCHPIN2 + DATAPIN3 + LATCHPIN3;


while(1) {
volatile unsigned char second = 0;
volatile unsigned char secondmod = 0;
volatile unsigned char minutes = 0;
volatile unsigned char minutesmod = 0;
volatile unsigned char hours = 0;
volatile unsigned char hoursmod = 0;

while (second < 84000) {

hoursmod = hours % 24;
secondmod = second % 60;
minutesmod = minutes % 60;



second++;
P1OUT &= ~LATCHPIN;
shiftOut(secondmod);
P1OUT |= LATCHPIN;

if (secondmod == 0)
{
minutes++;
P1OUT &= ~LATCHPIN2;
shiftOut2(minutesmod);
P1OUT |= LATCHPIN2;

if (minutesmod == 0)
{
hours++;
P1OUT &= ~LATCHPIN3;
shiftOut3(hoursmod);
P1OUT |= LATCHPIN3;


}

}







__delay_cycles(1000);



}


}
}

void shiftOut(char data) {
volatile int i;


for (i = 0; i < 8; i++) { // 8 bits to a char
char bittowrite = (0x01 & data); // get bit
data = data >> 1; // shift data left
if (bittowrite == 1) { // send bit
P1OUT |= DATAPIN ;
} else {
P1OUT &= ~DATAPIN;
}
// pulse clockpin
P1DIR |= CLOCKPIN;
P1DIR &= ~CLOCKPIN;
}

}

void shiftOut2(char data2) {
volatile int i;


for (i = 0; i < 8; i++) { // 8 bits to a char
char bittowrite = (0x01 & data2); // get bit
data2 = data2 >> 1; // shift data left
if (bittowrite == 1) { // send bit
P1OUT |= DATAPIN2 ;
} else {
P1OUT &= ~DATAPIN2 ;
}
// pulse clockpin
P1DIR |= CLOCKPIN;
P1DIR &= ~CLOCKPIN;
}

}


void shiftOut3(char data3) {
volatile int i;



for (i = 0; i < 8; i++) { // 8 bits to a char
char bittowrite = (0x01 & data3); // get bit
data3 = data3 >> 1; // shift data left
if (bittowrite == 1) { // send bit
P1OUT |= DATAPIN3 ;
} else {
P1OUT &= ~DATAPIN3 ;
}
// pulse clockpin
P1DIR |= CLOCKPIN;
P1DIR &= ~CLOCKPIN;
}

}