Comments for Notes.c

1 files changed, 10 insertions, 7 deletions

diff --git a/notes.c b/notes.c
index 448d7f7..dbbca44 100644
--- 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);