hw-rollerderby-scoreboard/main.c

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#include <msp430.h>
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#include <stdint.h>
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#include <stdbool.h>
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const uint8_t digits[] = {
0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f,
0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71
};
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// seconds/60
volatile uint16_t jiffies = 0;
unsigned int i = 0;
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#define MODE BIT0
#define SIN BIT1
#define SCLK BIT2
#define XLAT BIT3
#define BLANK BIT4
#define GSCLK BIT5
#define bit(pin, bit, on) pin = (on ? (pin | bit) : (pin & ~bit))
#define mode(on) bit(P1OUT, MODE, on)
#define sin(on) bit(P1OUT, SIN, on)
#define sclk(on) bit(P1OUT, SCLK, on)
#define xlat(on) bit(P1OUT, XLAT, on)
#define blank(on) bit(P1OUT, BLANK, on)
#define gsclk(on) bit(P1OUT, GSCLK, on)
void
latch()
{
xlat(true);
xlat(false);
}
void
write(uint16_t number)
{
int i;
int j;
// MSB first
for (i = 15; i >= 0; i -= 1) {
sin(number & (1 << i));
for (j = 0; j < 12; j += 1) {
sclk(true);
sclk(false);
}
}
}
void
blip()
{
int i;
for (i = 0; i < 1000; i += 1) {
__delay_cycles(1000);
}
}
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int
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main(void)
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{
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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
P1OUT = 0;
// Set up the stupid DC crappo
mode(true);
sin(false);
for (i = 0; i < 96; i += 1) {
sclk(true);
sclk(false);
}
latch();
mode(false);
// Zero out numbers
sin(false);
for (i = 0; i < 192; i += 1) {
sclk(true);
sclk(false);
}
latch();
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#if 1
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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
TACCR0 = 0x4444;
__enable_interrupt();
#endif
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// Now actually run
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for (;;) {
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if ((jiffies % 60) == 0) {
write(0xffff);
blank(true);
latch();
blank(false);
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} else {
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P1OUT ^= GSCLK;
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}
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}
}
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// Timer A0 interrupt service routine
__attribute__((interrupt(TIMER0_A0_VECTOR)))
void timer_a(void)
{
jiffies += 1;
if ((jiffies / 60) % 2) {
P1OUT |= BIT6;
} else {
P1OUT &= ~BIT6;
}
}