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add beep

This commit is contained in:
Christoph J. Scherr 2023-10-27 12:21:16 +02:00
parent 148da01344
commit dc31d518c1
1 changed files with 37 additions and 7 deletions
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44
beep/main.c
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@ -1,21 +1,51 @@
/*
* Control PB5 with the two buttons. One button disables, the other enables.
* The board uses interrupts for this. PB5 will quickly oscilate between on and
* off to make cool sounds with a summer.
*/
#define F_CPU 16000000UL #define F_CPU 16000000UL
#define __AVR_ATmega328P__ #define __AVR_ATmega328P__
#include <util/delay.h>
#include <avr/interrupt.h>
#include <avr/io.h> #include <avr/io.h>
int main(void) { int beep = 0;
DDRB = 0xff; int sound = 0;
DDRD = 0;
PORTD |= (1 << PORTD2) | (1 << PORTD3); // code for INT0
ISR(INT0_vect) { beep = 1; }
// code for INT1
ISR(INT1_vect) { beep = 0; PORTB &= ~(1 << PORTB5); sound = 0;}
int main(void) {
DDRB = 0xff; // write to B
DDRD = 0; // read from D
PORTD |= (1 << PORTD2) | (1 << PORTD3); // pull up D2 and D3
PORTB = 0; PORTB = 0;
// enable external interruprs
EIMSK |= (1 << INT0);
EIMSK |= (1 << INT1);
// trigger when anything changes
EICRA |= (1 << ISC00); // for INT0
EICRA |= (1 << ISC10); // for INT1
sei(); // interrupt magic macro
while (1) { while (1) {
if (!(PIND & (1 << PIND2))) { if (beep) {
PORTB |= (1 << PORTB5); PORTB |= (1 << PORTB5);
} _delay_us(sound);
if (!(PIND & (1 << PIND3))) {
PORTB &= ~(1 << PORTB5); PORTB &= ~(1 << PORTB5);
_delay_us(sound);
sound++;
if (sound > 1000) {
sound = 0;
}
} }
} }
} }