hw-rollerderby-scoreboard/main.c

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C
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <avr/io.h>
#include <util/delay.h>
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#include "avr.h"
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// Number of shift registers in your scoreboard
// If you want scores to go over 199, you need 8
const int nsr = 6;
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//
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// Timing stuff
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//
//
// 2**32 deciseconds = 13.610221 years
//
// As long as you unplug your scoreboard once every 10 years or so,
// you're good.
//
volatile uint32_t jiffies = 0; // Elapsed time in deciseconds
volatile bool tick = false; // Set high when jiffy clock ticks
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// Clocks are in deciseconds
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uint16_t score_a = 0;
uint16_t score_b = 0;
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int16_t period_clock = -(30 * 60 * 10);
int16_t jam_duration = -(2 * 60 * 10);
int16_t lineup_duration = (-30 * 10);
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int16_t jam_clock = 0;
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enum {
SETUP,
JAM,
LINEUP,
TIMEOUT
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} state = SETUP;
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// NES Controller buttons
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#define BTN_A _BV(7)
#define BTN_B _BV(6)
#define BTN_SELECT _BV(5)
#define BTN_START _BV(4)
#define BTN_UP _BV(3)
#define BTN_DOWN _BV(2)
#define BTN_LEFT _BV(1)
#define BTN_RIGHT _BV(0)
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const uint8_t seven_segment_digits[] = {
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0x7b, 0x60, 0x37, 0x76, 0x6c, 0x5e, 0x5f, 0x70, 0x7f, 0x7e
};
const uint8_t setup_digits[] = {
0x1b, 0x12, 0x72
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};
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void
latch()
{
xlat(true);
xlat(false);
}
void
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pulse()
{
sclk(true);
sclk(false);
}
void
write(uint8_t number)
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{
int i;
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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void
write_num(uint16_t number, int digits)
{
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uint16_t divisor = 1;
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int i;
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for (i = 0; i < digits; i += 1) {
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uint16_t n = number / divisor;
uint8_t out = seven_segment_digits[n % 10];
// Overflow indicator
if (n > 9) {
out ^= 0x80;
}
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write(out);
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divisor *= 10;
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}
}
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/*
* Update all the digits
*/
void
draw()
{
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uint16_t clk;
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// XXX testing
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write_num(score_b, 2);
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if (state == SETUP) {
write(setup_digits[2]);
write(setup_digits[1]);
write(setup_digits[1]);
write(setup_digits[0]);
} else {
clk = (abs(jam_clock / 600) % 10) * 1000;
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clk += abs(jam_clock) % 600;
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write_num(clk, 4);
}
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if ((state == TIMEOUT) && (jam_clock % 8 == 0)) {
// Blank it out
for (clk = 0; clk < 4; clk += 1) {
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write(setup_digits[1]);
}
} else {
clk = (abs(period_clock / 10) / 60) * 100;
clk += abs(period_clock / 10) % 60;
write_num(clk, 4);
}
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write_num(score_a, 2);
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write_num(jiffies % 200, 2);
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latch();
pulse();
}
/*
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* Probe the NES controller
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*/
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uint8_t
nesprobe()
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{
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int i;
uint8_t state = 0;
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nesltch(true);
nesltch(false);
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for (i = 0; i < 8; i += 1) {
state <<= 1;
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if (nesout()) {
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// Button not pressed
} else {
state |= 1;
}
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nesclk(true);
nesclk(false);
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}
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// Only report button down events.
return state;
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}
void
update_controller()
{
static uint8_t last_val = 0;
static uint8_t last_change = 0;
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uint8_t cur;
uint8_t pressed;
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int inc = 1;
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cur = nesprobe();
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pressed = (last_val ^ cur) & cur;
if (last_val != cur) {
last_change = jiffies;
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last_val = cur;
}
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if ((pressed & BTN_A) && ((state != JAM) || (jam_clock == 0))) {
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state = JAM;
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jam_clock = jam_duration;
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}
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if ((pressed & BTN_B) && ((state != LINEUP) || (jam_clock == 0))) {
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state = LINEUP;
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jam_clock = lineup_duration;
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}
if ((pressed & BTN_START) && (state != TIMEOUT)) {
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state = TIMEOUT;
jam_clock = 1;
}
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if ((state == TIMEOUT) || (state == SETUP)) {
uint8_t v = pressed;
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if (jiffies - last_change > 10) {
v = cur;
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}
if (v & BTN_UP) {
period_clock -= 10;
}
if (v & BTN_DOWN) {
period_clock += 10;
}
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}
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if (pressed & BTN_LEFT) {
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score_a += inc;
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}
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if (pressed & BTN_RIGHT) {
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score_b += inc;
}
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}
/*
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*
* Main program
*
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*/
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void
setup()
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{
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int i;
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// TLC594 datasheet says you have to do this before DC initialization.
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// In practice it doesn't seem to matter, but what the hey.
draw();
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// Initialize dot correction logic
mode(true);
sin(true);
for (i = 0; i < nsr * 96; i += 1) {
pulse();
}
latch();
mode(false);
}
void
loop()
{
uint32_t i;
if (tick) {
tick = false;
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update_controller();
if (jiffies % 10 == 0) {
PORTB ^= 0xff;
}
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switch (state) {
case SETUP:
break;
case JAM:
case LINEUP:
if (period_clock) {
period_clock += 1;
}
// fall through
case TIMEOUT:
if (jam_clock) {
jam_clock += 1;
}
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}
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draw();
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}
}
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int
main(void)
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{
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init();
setup();
for (;;) {
loop();
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}
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return 0;
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}