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prepare for uart commands

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Vineet K 2024-04-21 15:22:20 -04:00 committed by Shokara Kou
parent c2fe984ed4
commit d129c76966
1 changed files with 45 additions and 15 deletions
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60
notes.c
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@ -41,6 +41,9 @@ unsigned short freqs[] = {
[255] = 0 // used as a 'silent' note [255] = 0 // used as a 'silent' note
}; };
unsigned char note = 0; unsigned char note = 0;
// 0 = buttons write note+cycles+\xff to UART
// 1 = buttons don't do anything, speaker reads note+cycles+\xff from UART
unsigned char mode = 0;
ISR (PCINT0_vect) ISR (PCINT0_vect)
{ {
@ -121,33 +124,60 @@ main(void)
// Sends Square wave to the Speaker When a Button is Pressed // Sends Square wave to the Speaker When a Button is Pressed
unsigned short cycles = 0; unsigned short cycles = 0;
unsigned char last_note = 0; unsigned char tmp = 0;
for (unsigned char n = 0;; n = (n + 1) % 2) { for (;;) {
// check if any buttons are pressed, otherwise don't play a note // check if any buttons are pressed, otherwise don't play a note
if (((PINB & PCMSK0) | (PINC & PCMSK1) | (PIND & PCMSK2)) == 0) { if (((PINB & PCMSK0) | (PINC & PCMSK1) | (PIND & PCMSK2)) == 0) {
// if a button was released, then send note and cycles played // if a button was released, then send note and cycles played
if (cycles > 0) { if (cycles > 0) {
usart_send(last_note); usart_send(tmp);
usart_send(HIGH(cycles)); usart_send(HIGH(cycles));
usart_send(LOW(cycles)); usart_send(LOW(cycles));
usart_send('\xff'); usart_send(0xff);
cycles = 0; cycles = 0;
} else {
if (UCSR0A & (1 << RXC0)) {
mode = UDR0;
usart_send(mode);
}
} }
continue; continue;
} }
// Prepare Timer/Counter if (mode == 0) {
TCNT1 = 1; // Prepare Timer/Counter
last_note = note; TCNT1 = 1;
OCR1A = freqs[note]; tmp = note;
TCCR1B |= 1 << CS11; OCR1A = freqs[note];
TCCR1B |= 1 << CS11;
while ((TIFR1 & (1 << OCF1A)) == 0); // Monitor OutPut Compare Flag // Monitor OutPut Compare Flag
while ((TIFR1 & (1 << OCF1A)) == 0);
// Toggles port For Speaker // Toggles port For Speaker
PORTD ^= 1 << P_SPKR; PORTD ^= 1 << P_SPKR;
TIFR1 |= 1 << OCF1A; TIFR1 |= 1 << OCF1A;
TCCR1B &= ~(1 << CS11); TCCR1B &= ~(1 << CS11);
cycles = (cycles + 1) % 0xffff; cycles = (cycles + 1) % 0xffff;
} else if (mode == 0xb0) {
note = usart_read();
tmp = usart_read();
cycles = tmp << 8;
tmp = usart_read();
cycles |= tmp;
(void)usart_read();
for (unsigned char i = 0; i < cycles; i++) {
TCNT1 = 1;
OCR1A = freqs[note];
TCCR1B |= 1 << CS11;
while ((TIFR1 & (1 << OCF1A)) == 0);
PORTD ^= 1 << P_SPKR;
TIFR1 |= 1 << OCF1A;
TCCR1B &= ~(1 << CS11);
}
}
} }
} }