mirror of
https://codeberg.org/eel4746_piano/avr_piano.git
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83 lines
1.4 KiB
C
83 lines
1.4 KiB
C
/*
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* EEL4746C - AVR Piano - Speaker Section
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* speaker is connected to PD2 and ground
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* buttons are connected to PB0-5, PC0-5, PD3-7
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* the LCD Arduino UNO is connected to TX/RX (PD0/1)
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*/
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#define F_CPU 16000000UL
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#define __DELAY_BACKWARD_COMPATIBLE__ /* to use variables with _delay_u/ms */
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#include <util/delay.h>
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#define P_RX 0
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#define P_TX 1
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#define P_SPKR 2
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unsigned short freqs[] = {
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1 / 100 * 1e6 / 2,
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1 / 200 * 1e6 / 2,
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1 / 250 * 1e6 / 2,
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1 / 300 * 1e6 / 2,
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1 / 350 * 1e6 / 2,
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1 / 400 * 1e6 / 2,
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1 / 500 * 1e6 / 2,
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1 / 600 * 1e6 / 2,
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1 / 700 * 1e6 / 2,
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1 / 750 * 1e6 / 2,
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1 / 1000 * 1e6 / 2,
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1 / 1250 * 1e6 / 2,
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1 / 1500 * 1e6 / 2,
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1 / 1750 * 1e6 / 2,
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1 / 2000 * 1e6 / 2,
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1 / 3000 * 1e6 / 2,
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1 / 4000 * 1e6 / 2,
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1 / 5000 * 1e6 / 2,
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1 / 6000 * 1e6 / 2,
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1 / 7000 * 1e6 / 2,
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1 / 8000 * 1e6 / 2
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};
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unsigned char note = 8;
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unsigned char buttonpressed = 1;
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int
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main(void)
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{
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DDRB = 0x00;
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DDRC = 0x00;
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DDRD = (1 << P_TX) | (1 << P_SPKR);
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PCMSK0 = 0xFF;
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PCMSK1 = 0xFF;
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PCMSK2 = ~(1 | (1 << 1) | (1 << 2));
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PCICR = (1 << PCIE0) | (1 << PCIE1) | (1 << PCIE2);
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sei();
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//for (;;);
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for (unsigned char n = 0;; n = (n + 1) % 2) {
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if (!buttonpressed && n == 0) continue;
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_delay_us(freqs[note]);
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// _delay_us(714.2857);
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// _delay_us(70);
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PORTD ^= 1 << P_SPKR;
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}
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}
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ISR (PCINT0_vect)
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{
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}
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ISR (PCINT1_vect)
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{
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}
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ISR (PCINT2_vect)
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{
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}
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