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#include <avr/io.h>
#include <util/delay.h>
// gfedcba
const long digits[] = {
0b0111111, 0b0000110, 0b1011011, 0b1001111, 0b1100110,
0b1101101, 0b1111101, 0b0000111, 0b1111111, 0b1101111,
};
// a, b, c, d, e, f, g
const int segment_pins[] = {4, 5, 6, 7, 8, 9, 10};
void write_digit(int digit) {
if (digit > 9 || digit < 0)
return;
long mask = digits[digit];
for (int i = 0; i < 7; i++) {
short on = 0 != (mask & (i == 0 ? 1 : 2 << (i - 1)));
// digitalWrite(segment_pins[i], on);
}
}
void setup(void) {
for (int i = 0; i < 7; i++) {
int pin = segment_pins[i];
DDRA |= (1 << PA1);
}
}
int i = 0;
void loop(void) {
write_digit(i);
_delay_ms(500);
i = (i + 1) % 10;
}
int main(void) {
setup();
while (1) {
loop();
// PORTA |= (1 << PA1);
// _delay_ms(500);
// PORTA &= ~(1 << PA1);
// _delay_ms(500);
}
return 0;
}
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