173 lines
2.7 KiB
C
173 lines
2.7 KiB
C
#include <msp430.h>
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#include <stdint.h>
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#include <stdbool.h>
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// Number of shift registers in your scoreboard
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// If you want scores to go over 199, you need 8
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const int nsr = 6;
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const uint8_t seven_segment_digits[] = {
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#if 0
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0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71
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#else
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0x7e, 0x48, 0x3d, 0x6d, 0x4b, 0x67, 0x77, 0x4c, 0x7f, 0x6f,
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#endif
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};
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// seconds/60
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volatile uint16_t jiffies = 0;
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#define MODE BIT0
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#define SIN BIT1
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#define SCLK BIT2
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#define XLAT BIT3
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#define BLANK BIT4
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#define GSCLK BIT5
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#define bit(pin, bit, on) pin = (on ? (pin | bit) : (pin & ~bit))
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#define mode(on) bit(P1OUT, MODE, on)
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#define sin(on) bit(P1OUT, SIN, on)
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#define sclk(on) bit(P1OUT, SCLK, on)
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#define xlat(on) bit(P1OUT, XLAT, on)
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#define blank(on) bit(P1OUT, BLANK, on)
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#define gsclk(on) bit(P1OUT, GSCLK, on)
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void
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latch()
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{
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xlat(true);
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xlat(false);
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}
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void
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pulse()
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{
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sclk(true);
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sclk(false);
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}
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void
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write(uint8_t number)
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{
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int i;
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int j;
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// MSB first
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for (i = 7; i >= 0; i -= 1) {
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sin(number & (1 << i));
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for (j = 0; j < 12; j += 1) {
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pulse();
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}
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}
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}
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void
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write_num(uint16_t number, int digits)
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{
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int i;
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for (i = 0; i < digits; i += 1) {
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write(seven_segment_digits[number % 10]);
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number /= 10;
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}
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}
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void
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blip()
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{
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int i;
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for (i = 0; i < 1000; i += 1) {
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__delay_cycles(1000);
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}
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}
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/* Set up grayscale */
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void
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setup_gs()
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{
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int i;
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for (i = 0; i < nsr; i += 1) {
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write(0);
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}
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latch();
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}
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/*
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* Set up dot correction.
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*
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* We don't use dot correction so this is easy: set everything to full brightness.
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*/
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void
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setup_dc()
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{
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int i;
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mode(true);
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sin(true);
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for (i = 0; i < nsr * 96; i += 1) {
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pulse();
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}
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latch();
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mode(false);
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}
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int
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main(void)
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{
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int gscount = 0;
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WDTCTL = WDTPW + WDTHOLD; // Disable Watchdog Timer
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P1DIR |= MODE + SIN + SCLK + XLAT + BLANK + GSCLK + BIT6; // P1 output bits
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P1OUT = 0;
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setup_gs();
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setup_dc();
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// Enable interrupts
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CCTL0 |= CCIE; // Trigger interrup on A checkpoint
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TACTL = TASSEL_2 + MC_1; // Set timer A to SMCLCK, up mode
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TACCR0 = 0x4444; // Interrupt 60 times per second
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__enable_interrupt();
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// Now actually run
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for (;;) {
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if ((jiffies % 6) == 0) {
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write_num(jiffies / 6, 4);
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gsclk(false);
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latch();
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gscount = 4096;
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}
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if (gscount == 4096) {
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// Pulse BLANK when grayscale clock has cycled 4096 times.
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blank(true);
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blank(false);
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gscount = 0;
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}
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// Pulse the grayscale clock.
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gsclk(true);
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gsclk(false);
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gscount += 1;
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}
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}
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// Timer A0 interrupt service routine
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__attribute__((interrupt(TIMER0_A0_VECTOR)))
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void timer_a(void)
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{
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jiffies += 1;
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if ((jiffies / 60) % 2) {
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P1OUT |= BIT6;
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} else {
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P1OUT &= ~BIT6;
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}
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}
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