Notes

#include <msp430.h>
#define BUTTON BIT3 // Port 1.3
#define REDLED BIT0 // Port 1.0
#define GRNLED BIT6 // Port 1.6
#define ZERO 0x08
#define ONE 0x48
#define TWO 0x09
#define THREE 0x49
int counter = 0;
int main(void) {
// Watchdog setup
WDTCTL = WDTPW + WDTHOLD; // stop watchdog (password + hold counter)
// LED initial setup
P1DIR |= REDLED + GRNLED; // set P1.0 and P1.6 as output (1) pins
P1OUT &= ~REDLED; // Disable REDLED
P1OUT &= ~GRNLED; // Disable GRNLED
// Button setup
P1DIR &= ~BUTTON; // button is an input
P1OUT |= BUTTON; // pull-up resistor
P1REN |= BUTTON; // resistor enabled
P1IE =BUTTON;
P1IES =BUTTON;
P1IFG =BUTTON;
__enable_interrupt();
for(;;){
}
#pragma vector = PORT1_VECTOR // a sets the interrupt service routine vector
__interrupt void Port_1(void)
{
P1IFG=0x00;
if ((P1IN & 0x08) == 0){
counter += 1;
counter = (counter % 4);
switch(counter){
case 0:
P1OUT = ZERO;
break;
case 1:
P1OUT = ONE;
break;
case 2:
P1OUT = TWO;
break;
case 3:
P1OUT = THREE;
break;
}
}
return 0;
}
}