src/display.c


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#include <avr/io.h>
#include <stdint.h>
#include <util/delay.h>

#include "display.h"

// "_gfedcba"
// Reversed because a-g is mapped to pa0-6. (pa7 is decimal)
// Complemented because display is common anode
const uint32_t digit_masks[] = {
    0b01000000, 0b01111001, 0b00100100, 0b00110000, 0b00011001,
    0b00010010, 0b00000010, 0b01111000, 0b00000000, 0b00010000,
};

void write_digit(uint8_t digit) {
  if (digit > 9 || digit < 0)
    return;
  PORTA = digit_masks[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);
}