92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
#define __AVR_ATmega2560__
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#define F_CPU 16000000UL
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#define TICK_BEEP false
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#include <avr/io.h>
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#include <util/delay.h>
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#include <stdbool.h>
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#include <avr/interrupt.h>
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#include "lib/util.h"
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#include "lib/7segment.h"
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#include "lib/7segment_4digits.h"
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int tick_timer_start = 0xffff - (F_CPU / 1024 / 1000); // 1ms
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volatile uint32_t ticks = 0;
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volatile beep_time = 0;
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volatile bool counting = false;
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void start_timer() {
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// Sets the Clock Select. See table on page 157 the Atmel datasheet.
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TCCR1B |= _BV(CS10) | _BV(CS12); // clk/1024
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TCCR2B |= _BV(CS22); // clk/64
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// Set the TOIE (Timer Overflow Interrupt Enable) bit
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// on TIMSK1 (Timer 1 Interrupt Mask Register).
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TIMSK1 |= _BV(TOIE1);
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TIMSK2 |= _BV(TOIE2);
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// Sets the current timer value
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TCNT1 = tick_timer_start;
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// Enable interrupts
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sei();
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}
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// ISR is used to handle interrupts. TIMER1_OVF_vect
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// is triggered whenever timer 1 (16 bit) overflows.
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ISR(TIMER1_OVF_vect) {
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TCNT1 = tick_timer_start;
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if (counting) {
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ticks += 1;
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if (TICK_BEEP && ticks % 1000 == 0 && !beep_time) beep_time = 10;
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}
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if (bit_is_set(PIND, PIND0)) {
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PORTD &= 0b11111110;
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} else if (beep_time > 0) {
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PORTD |= 0b00000001;
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beep_time--;
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}
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}
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ISR(TIMER2_OVF_vect) {
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update_next_digit();
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}
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void beep() {
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beep_time = 50;
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}
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void main() {
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DDRF = 0b11111111;
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DDRK = 0b00001111;
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DDRD = 0b00000001;
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PORTK = 0b11000000; // set pull-up
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start_timer();
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float num = 0.0f;
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bool pressed_pause = false;
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bool pressed_clear = false;
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while(1) {
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show_float(ticks / 1000.0f);
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if (!pressed_pause && bit_is_clear(PINK, PINK7)) {
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counting = !counting;
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pressed_pause = true;
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beep();
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} else if (pressed_pause && bit_is_set(PINK, PINK7)) {
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pressed_pause = false;
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}
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if (bit_is_clear(PINK, PINK6)) {
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ticks = 0;
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counting = false;
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if (!pressed_clear) beep();
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pressed_clear = true;
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} else pressed_clear = false;
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}
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}
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