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// 2010 Kenneth Finnegan
// http://kennethfinnegan.blogspot.com/
// Two color blink clock running on MSP430 controller
#include "msp430G2101.h"
#define BLINK_ON 3000
#define BLINK_OFF 1500
#define BLINK_SPACE 6000
volatile unsigned char time[4];
volatile unsigned char mode;
// FUNCTIONS
void displayNum (int c);
void displayTime(void);
void displayTwiddle(void);
void pause (int c);
void main(void) {
WDTCTL = WDTPW + WDTHOLD; // Stop Watchdog Timer
BCSCTL3 = (BCSCTL3 & ~(XCAP0 | XCAP1)) | XCAP_1; // 6pF xtal
BCSCTL2 = 0xF8; // MCLK:LFXT1CLK/8 SMCLK:LFXT1CLK
P1DIR = 0x41;
P1OUT = 0x0F; // pull up resistors
P1REN = 0x0E; // pull up resistors enable
P1IE = 0x08; // Setup P1.3 for interrupt
P1IES = 0x08; // High -> Low transistion
P1IFG &= ~0x08; // Clear int flag
CCTL0 = CCIE;
CCR0 = 0;
TACCR0 = 0x7FFF; // Period of 32767 + 1
TACTL = 0x0211; // Timer_A: SMCLK, UP MODE, TAIE
while(1) {
mode = 0;
_BIS_SR(LPM1_bits + GIE);
switch (mode) {
case 0x06: // display time
displayTime();
break;
case 0x04: // display hours
if (time[3]) displayTwiddle();
pause(BLINK_SPACE);
displayNum(time[2]);
break;
case 0x02: // increment minutes
displayNum(time[1]);
break;
}
}
}
#pragma vector=TIMERA0_VECTOR
__interrupt void Timer_A (void) {
//P1OUT ^= 1;
time[0] = (time[0] + 1) % 60;
if (time[0] == 0) { // new minute
time[1] = (time[1] + 1) % 60;
if (time[1] == 0) { // new hour
time[2] = (time[2] + 1) % 12;
time[2] = time[2]?time[2]:12;
if (time[2] == 12) { // new AM/PM
time[3] = !time[3];
}
}
}
}
#pragma vector=PORT1_VECTOR
__interrupt void Port_1 (void) {
mode = P1IN & 0x06;
LPM1_EXIT; // Wake up the main loop
switch (mode) { // Needs debounce!
case 0x04:
time[2] = (time[2] + 1) % 12;
time[2] = time[2]?time[2]:12;
if (time[2] == 12) { // new AM/PM
time[3] = !time[3];
}
break;
case 0x02:
time[1] = (time[1] + 1) % 60;
time[0] = 0;
break;
}
P1IFG = 0; // Clear int flag
}
void displayTime(void) {
if (time[3]) { // twiddle on PM
displayTwiddle();
}
pause(BLINK_SPACE);
displayNum(time[2]);
pause(BLINK_SPACE);
displayNum(time[1]);
}
void displayNum (int c) {
int i;
for (i=c/10; i; i--) {
P1OUT |= 0x40;
pause(BLINK_ON);
P1OUT &= ~0x40;
pause(BLINK_OFF);
}
if ((c%10) > 4) {
P1OUT |= 0x41;
pause(BLINK_ON);
P1OUT &= ~0x41;
pause(BLINK_OFF);
}
for (i=c%5; i; i--) {
P1OUT |= 0x1;
pause(BLINK_ON);
P1OUT &= ~0x1;
pause(BLINK_OFF);
}
P1OUT &= ~(0x41);
}
void displayTwiddle(void) {
int i;
for (i=0; i<2; i++) {
P1OUT |= 0x40;
P1OUT &= ~(0x01);
pause(BLINK_ON);
P1OUT |= 0x01;
P1OUT &= ~(0x40);
pause(BLINK_ON);
}
P1OUT &= ~(0x41);
}
void pause (int c) {
volatile unsigned int t = c;
do { t--;} while (t);
}
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