eel4746_avr_piano

commit 9f6c3500159cd828d633345d1fb39250b4e5669b
parent d4d4114b316ff262024119925577915e4b5d75d9
Author: Joseph Bryant <jbryant0653@floridapoly.edu>
Date:   Wed, 17 Apr 2024 15:26:01 -0400

Comments for Notes.c

Diffstat:
M
notes.c
 | 
17
++++++++++-------

1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/notes.c b/notes.c
@@ -1,7 +1,6 @@
 /*
  *  EEL4746C - AVR Piano - Speaker Section
- *  speaker is connected to PD2 and ground
-, PD3-7
+ *  speaker is connected to PD2 and ground, PD3-7
  *  the LCD Arduino UNO is connected to TX/RX (PD0/1)
  */
 
@@ -42,12 +41,14 @@ unsigned char note = 8;
 unsigned char buttonpressed = 1;
 
 int
-main(void)
+main(void) 
 {
+	// Data Direction for Buttons, UART, Speaker
 	DDRB = 0x00;
 	DDRC = 0x00;
-	DDRD = (1 << P_TX) | (1 << P_SPKR);
+	DDRD = (1 << P_TX) | (1 << P_SPKR); 
 
+	// Enabling Pin Change Interrupt for All Buttons
 	PCMSK0 = 0xFF;
 	PCMSK1 = 0xFF;
 	PCMSK2 = ~(1 | (1 << 1) | (1 << 2));
@@ -58,16 +59,18 @@ main(void)
 
 	sei();
 
-	//for (;;);
+	// Sends Square wave to the Speaker When a Button is Pressed
 	for (unsigned char n = 0;; n = (n + 1) % 2) {
 		if (!buttonpressed && n == 0) continue;
-
+		
+		// Prepare Timer/Counter
 		TCNT1 = 1;
 		OCR1A = freqs[note];
 		TCCR1B |= 1 << CS11;
 
-		while ((TIFR1 & (1 << OCF1A)) == 0);
+		while ((TIFR1 & (1 << OCF1A)) == 0); // Monitor OutPut Compare Flag
 
+		// Toggles port For Speaker
 		PORTD ^= 1 << P_SPKR;
 		TIFR1 |= 1 << OCF1A;
 		TCCR1B &= ~(1 << CS11);