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#include <avr/io.h>
#include <stdint.h>
#include <util/delay.h>
// a b c d e f g decimal
// Reversed because a-g is mapped to pa0-6. (pa7 is decimal)
// Complemented because display is common anode
const uint32_t digits[] = {
0b01000000, 0b01111001, 0b00100100, 0b00110000, 0b00011001,
0b00010010, 0b00000010, 0b01111000, 0b00000000, 0b00010000,
};
void write_digit(uint8_t digit) {
if (digit > 9 || digit < 0)
return;
PORTA = digits[digit];
}
void write_time(uint16_t hour, uint16_t minute) {
uint8_t minute_digit1 = minute % 10;
uint8_t minute_digit2 = minute / 10;
// unsigned short hour_digit1 = hour % 10;
// unsigned short hour_digit2 = hour / 10;
#ifdef STUBBED
printf("\r:: %d %d", minute_digit2, minute_digit1);
fflush(stdout);
#endif
write_digit(minute_digit1);
PORTA |= (1 << PA7);
_delay_ms(10);
PORTA &= ~(1 << PA7);
write_digit(minute_digit2);
PORTB |= (1 << PB2);
_delay_ms(10);
PORTB &= ~(1 << PB2);
}
int main(void) {
DDRA |= 0b11111111;
DDRB |= (1 << PB2);
uint32_t i = 0;
while (1) {
write_time(0, (i / 20) % 60);
i = (i + 1) % 100000;
}
return 0;
}
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