62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
#include <avr/io.h>
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#include <stdint.h>
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#include <util/delay.h>
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#include <stdbool.h>
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#define D1 PB0
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#define D2 PB1
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#define D3 PB2
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#define D4 PB4
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#define SW1 PD2
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#define SW2 PD4
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int main(void) {
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// ouput pins for leds
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DDRB |= _BV(D4);
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DDRB |= _BV(D3);
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DDRB |= _BV(D2);
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DDRB |= _BV(D1);
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// set input (not neccessary since input by default)
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DDRD &= ~(_BV(SW1));
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DDRD &= ~(_BV(SW2));
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PORTB |= _BV(D4);
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uint8_t prev = 0;
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uint8_t value = 0;
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while (true) {
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// lets read both button in a single byte, and keep track of that too
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uint8_t cur = (PIND & (_BV(SW1) | _BV(SW2)));
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// check for button SW1
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if (prev & (_BV(SW1)) && !(cur & (_BV(SW1)))) {
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value++;
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}
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// check for button SW2
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if (prev & (_BV(SW2)) && !(cur & (_BV(SW2)))) {
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value--;
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}
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prev = cur;
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// for each bit of the counter -> lets turn on or of the led
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if (value & 0b0001)
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PORTB |= (_BV(D1));
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else
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PORTB &= ~(_BV(D1));
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if (value & 0b0010)
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PORTB |= (_BV(D2));
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else
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PORTB &= ~(_BV(D2));
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if (value & 0b0100)
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PORTB |= (_BV(D3));
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else
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PORTB &= ~(_BV(D3));
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if (value & 0b1000)
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PORTB |= (_BV(D4));
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else
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PORTB &= ~(_BV(D4));
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_delay_ms(20);
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}
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}
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