Ryan Sartin / Mbed 2 deprecated Wav_player_RPG_menu

This program utilizes an LCD, RPG, 8 ohm speaker, and SD card to provide the basic functions of a music player. The project cycles through the SD card for .wav files and tracks elapsed time. See http://mbed.org/users/rsartin3/notebook/wav-player-with-RPG-based-menu/ for more information.

Dependencies:   DebounceIn RPG SDFileSystem TextLCD mbed wav_header wave_player

Fork of Audio_Player by Ryan Sartin

Files at this revision

API Documentation at this revision

Revision 2:d9953793444c, committed 2013-03-05

Comitter:
rsartin3
Date:
Tue Mar 05 16:36:15 2013 +0000
Parent:
1:f31b40073d35
Commit message:
Changed name for clarification;

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file 
diff -r f31b40073d35 -r d9953793444c main.cpp
--- a/main.cpp	Tue Mar 05 06:34:43 2013 +0000
+++ b/main.cpp	Tue Mar 05 16:36:15 2013 +0000
@@ -1,5 +1,6 @@
 /*
  * Audio Player
+ * Josh Dunn & Ryan Sartin
  */
 
 #include "mbed.h"
@@ -170,6 +171,11 @@
 }
 
 void songClock() {
+/*
+*   songClock
+*   Reads in time and compares it to time_i, the global variable
+*   Used with Ticker API to count number of seconds elapsed since song started playing
+*/
     time_t time_f;
     time_f = time(NULL);
     
@@ -186,9 +192,11 @@
     bool firstList = false;   // Is it first instance of reading from SD card
     bool playlistExist = false;
     
+    // RPG Variables
     int rpgTick = 0; // Slow down RPG turning speed
     const int rpgThresh = 5;
     
+    // File interaction variables
     FILE *wave_file;    
     string mySongName = "Invalid";
     unsigned char wave_array[30];    
@@ -219,8 +227,8 @@
     while(1) {
         // ------------- No SD Card Detected ------------- 
         // Current bug... When SD card is removed and replaced, stays in not detected loop... or something
-        myled = sdDetect; 
-        myled2 = 0;
+        if(DEBUG) myled = sdDetect; 
+        if(DEBUG) myled2 = 0;
         if(!sdDetect)
         {
             if(DEBUG) {
@@ -228,9 +236,9 @@
                 wait_ms(50);
             }
             sdInsert = false;                   // Note no card is inserted
-            if(playlistExist){
+            if(playlistExist){                  // If a playlist has been made
                 playlistExist = false;
-                deleteList(root);
+                deleteList(root);               // Clear playlist
                 curr = root;
             }
             lcd.cls();
@@ -298,52 +306,53 @@
             }
             // ----------------- Press RPG Button -----------------        
             if(rpg.pb()) {
-                // if push button is pressed ... SOMETHING
+                // if push button is pressed:
                 lcd.cls();
-                lcd.printf("Song playing");
-                
-                //Check sd card maybes
-                
-                // File location name thing
+                lcd.printf("Song playing"); // Inform user song is playing
+                                
+                // File location name
                 mySongName.erase();
-                mySongName.append("/sd/");
-                mySongName.append(curr->s_name);
-                mySongName.append(".wav");
-                
-                // Open File
+                mySongName.append("/sd/"); // ======== Change if not using base sd card location =====
+                mySongName.append(curr->s_name); // Add current song name
+                mySongName.append(".wav");  // Add .wav extension
                 if(DEBUG) printf("Appended Name: %s\n\r", mySongName.c_str());
-                wave_file=fopen(mySongName.c_str(),"r");
                 
-                wave_file_check(wave_array, wave_file);
-                if(DEBUG) printf("Sample Rate: %d\r\n", wave_file_info.samples_per_second);
-                fclose(wave_file);
+                // Wav file header info 
+                wave_file=fopen(mySongName.c_str(),"r");  // Open file to get header information                
+                wave_file_check(wave_array, wave_file);   // Put info in global variable
+                if(DEBUG) printf("Sample Rate: %d\r\n", wave_file_info.samples_per_second); 
+                fclose(wave_file);                        // Close file
                 
+                // Initialize bottom row of LCD screen
                 lcd.locate(0,1);
                 lcd.printf("Time:    /   sec");
                 lcd.locate(10,1);
+                // Print length of selected wavfile
                 lcd.printf("%d", (int)(wave_file_info.length_of_file / (wave_file_info.samples_per_second * wave_file_info.number_of_channels * wave_file_info.bytes_per_sample)) );
                 
-                
+                // Open song for playing
                 wave_file=fopen(mySongName.c_str(),"r");
-               
+                // Start Ticker function that counts time elapsed each second
                 songTick.attach(&songClock, 1.0);
+                // Set reference time
                 set_time(1357020000);
                 time_i = time(NULL);
-                
+                // Play song
                 if(DEBUG) printf("Start Song\r\n");
                 waver.play(wave_file);
-                
+                // Close file
                 if(DEBUG) printf("Close Song!\r\n");
                 fclose(wave_file);
                 
+                // End ticker function
                 songTick.detach();
                 time_i = 0;
                 
+                // Clear LCD and show selected wav file
                 lcd.cls();
                 lcd.printf(curr->s_name);
                 if(DEBUG) printf("Finished mai SONG!\r\n");                
-            }            
-                if(DEBUG) printf("rpgTick: %d \r\n",rpgTick);
+            }              
         }
     }
 }