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#include <avr/interrupt.h>
#include <avr/io.h>
#include <stdbool.h>
#include <stdint.h>
#include <util/delay.h>
#include "display.h"
// Config for attiny84a + external 32KHz crystal osc taken from
// https://github.com/ingepnet/breadboardwatch/blob/master/Makefile#L26
#include <avr/fuse.h>
FUSES = {
.low = 0xe6,
.high = 0xd7,
.extended = 0xff,
};
void set_all_pins_output(void) {
DDRA |= 0b11111111;
DDRB |= 0b11111111;
}
void setup_rtc() {
// Set prescaler (Timer clock = F_CPU / 1024)
// For 32768Hz -> 32768/1024 = 32Hz
TCCR0B = (1 << CS02) | (1 << CS00) | (1 << WGM02);
TCCR0A = (1 << WGM01) | (1 << WGM00);
TCNT0 = 0; // Start counting from 0
OCR0A = 31; // 0-31 = 32 counts before timer interrupt (1Hz)
OCR0B = 0;
// TIFR0 = (1 << TOV0); // Clear interrupt flags
TIFR0 = (1 << OCF0A) | (1 << OCF0B) | (1 << TOV0); // Clear interrupt flags
// TIMSK0 = (1 << TOIE0); // Enable timer overflow interrupt
TIMSK0 = (1 << OCIE0A); // Enable timer overflow interrupt
}
volatile uint8_t seconds = 10;
volatile uint8_t minutes = 0;
volatile uint8_t hours = 0;
// Clock
ISR(TIM0_COMPA_vect, ISR_FLATTEN) {
// if (true) {
// OCR0A = 32;
// } else if (true) {
// OCR0A = 31;
// } else {
// OCR0A = 30;
// }
uint8_t s = seconds + 1;
seconds = s % 60;
if (s >= 60) {
uint8_t m = minutes + 1;
minutes = m % 60;
if (m >= 60) {
hours = (hours + 1) % 24;
}
}
}
volatile static uint8_t digit_mask = 0b0001;
// Display
ISR(TIM1_COMPA_vect, ISR_FLATTEN) {
set_all_pins_output();
write_time(minutes, seconds, digit_mask);
if (seconds % 2) {
PORTA &= ~(1 << PA5);
PORTB &= ~(1 << PB3);
} else {
PORTA |= (1 << PA5);
PORTB |= (1 << PB3);
}
digit_mask = digit_mask << 1;
if (digit_mask > 0b1000)
digit_mask = 0b0001;
}
#define IS_BUTTON_ON() ((PINA & (1 << PA0)) == 0)
#define ENABLE_BUTTON() (DDRA &= ~(1 << PA0))
int main(void) {
PRR = 0b0011; // Power reduction register. Shut down USI and ADC
setup_rtc();
setup_display();
sei();
set_all_pins_output();
while (1) {
// cli();
// set_all_pins_output();
// write_time(minutes, seconds, digit_mask);
// if (seconds % 2) {
// PORTA &= ~(1 << PA5);
// PORTB &= ~(1 << PB3);
// } else {
// PORTA |= (1 << PA5);
// PORTB |= (1 << PB3);
// }
// digit_mask = digit_mask << 1;
// if (digit_mask > 0b1000)
// digit_mask = 0b0001;
// ENABLE_BUTTON();
// if (IS_BUTTON_ON()) {
// cli();
// ENABLE_BUTTON();
// _delay_ms(25); // Debounced
// if (IS_BUTTON_ON()) {
// seconds += 1;
// sei();
// _delay_ms(50);
// continue;
// }
// }
// sei();
#ifdef STUBBED
stub_run_timers();
_delay_ms(100);
#endif
}
return 0;
}
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