hw-rollerderby-scoreboard/main.c

310 lines
4.5 KiB
C

#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include <avr/io.h>
#include <util/delay.h>
#include "avr.h"
// Number of shift registers in your scoreboard
// If you want scores to go over 199, you need 8
const int nsr = 8;
//
// Timing stuff
//
//
// 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
// Clocks are in deciseconds
uint16_t score_a = 0;
uint16_t score_b = 0;
int16_t period_clock = -(30 * 60 * 10);
int16_t jam_duration = -(2 * 60 * 10);
int16_t lineup_duration = (-30 * 10);
int16_t jam_clock = 0;
enum {
SETUP,
JAM,
LINEUP,
TIMEOUT
} state = SETUP;
// NES Controller buttons
#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)
const uint8_t seven_segment_digits[] = {
0x7b, 0x60, 0x37, 0x76, 0x6c, 0x5e, 0x5f, 0x70, 0x7f, 0x7e
};
const uint8_t setup_digits[] = {
0x1b, 0x12, 0x72
};
void
latch()
{
sltch(true);
sltch(false);
}
void
pulse()
{
sclk(true);
sclk(false);
}
void
write(uint8_t number)
{
int i;
int j;
// MSB first
for (i = 7; i >= 0; i -= 1) {
sin(number & (1 << i));
pulse();
}
}
void
write_num(uint16_t number, int digits)
{
int i;
for (i = 0; i < digits; i += 1) {
uint8_t out = seven_segment_digits[number % 10];
// Overflow indicator
if ((i == digits - 1) && (number > 9)) {
// Blink to indicate double-rollover
if ((number > 19) && (jiffies % 3 == 0)) {
// leave it blank
} else {
out ^= 0x80;
}
}
write(out);
number /= 10;
}
}
/*
* Update all the digits
*/
void
draw()
{
uint16_t jclk;
uint16_t pclk;
bool blank = ((state == TIMEOUT) && (jiffies % 8 == 0));
jclk = (abs(jam_clock / 600) % 10) * 1000;
jclk += abs(jam_clock) % 600;
pclk = (abs(period_clock / 10) / 60) * 100;
pclk += abs(period_clock / 10) % 60;
// Score A
write_num(score_b, 2);
// Jam clock, least significant half
write_num(jclk % 100, 2);
// Period clock
if (blank) {
write(0);
write(0);
write(0);
write(0);
} else if (state == SETUP) {
write(setup_digits[2]);
write(setup_digits[1]);
write(setup_digits[1]);
write(setup_digits[0]);
} else {
write_num(pclk, 4);
}
// Jam clock, most significant half
write_num(jclk / 100, 2);
// Score A
write_num(score_a, 2);
if (false) {
int i;
for (i = 0; i < 12; i += 1) {
write_num(jiffies / 10, 1);
}
}
// Tell chips to start displaying new values
latch();
pulse();
}
/*
* Probe the NES controller
*/
uint8_t
nesprobe()
{
int i;
uint8_t state = 0;
nesltch(true);
nesltch(false);
for (i = 0; i < 8; i += 1) {
state <<= 1;
if (nesout()) {
// Button not pressed
} else {
state |= 1;
}
nesclk(true);
nesclk(false);
}
// Only report button down events.
return state;
}
void
update_controller()
{
static uint8_t last_val = 0;
static uint8_t last_change = 0;
uint8_t cur;
uint8_t pressed;
int inc = 1;
cur = nesprobe();
pressed = (last_val ^ cur) & cur;
if (last_val != cur) {
last_change = jiffies;
last_val = cur;
}
// Select means subtract
if (cur & BTN_SELECT) {
inc = -1;
}
if ((pressed & BTN_A) && ((state != JAM) || (jam_clock == 0))) {
state = JAM;
jam_clock = jam_duration;
}
if ((pressed & BTN_B) && ((state != LINEUP) || (jam_clock == 0))) {
state = LINEUP;
jam_clock = lineup_duration;
}
if ((pressed & BTN_START) && (state != TIMEOUT)) {
state = TIMEOUT;
jam_clock = 1;
}
if ((state == TIMEOUT) || (state == SETUP)) {
uint8_t v = pressed;
if (jiffies - last_change > 10) {
v = cur;
}
if (v & BTN_UP) {
period_clock -= 10;
}
if (v & BTN_DOWN) {
period_clock += 10;
}
}
if (pressed & BTN_LEFT) {
score_a += inc;
}
if (pressed & BTN_RIGHT) {
score_b += inc;
}
}
/*
*
* Main program
*
*/
void
setup()
{
// The TLC5941 required some setup.
// The TPIC doesn't.
// Hooray.
PORTB = 0xff;
}
void
loop()
{
update_controller();
if (tick) {
tick = false;
if (jiffies % 5 == 0) {
PORTB ^= 0xff;
}
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;
}
}
}
draw();
}
int
main(void)
{
init();
setup();
for (;;) {
loop();
}
return 0;
}