main.cpp

00001 /* Author: Pramod Nataraja & Vishnu Venkat  */
00002  
00003  #include "mbed.h" 
00004  #include "VS1002.h" 
00005  #include "TextLCD.h"
00006  #include "mpr121.h"
00007   
00008 VS1002 mp3(p5, p6, p7, p8,"sd",p11, p12 ,p13, p14, p23, p22, p21, p15);  //Setup Audio decoder. Name is VS1002 even though VS1053 is used.
00009 TextLCD lcd1(p30, p29, p17, p18, p19, p20); //setup lcd
00010 InterruptIn interrupt(p26); // Create the interrupt receiver object on pin 26
00011 I2C i2c(p9, p10); // Setup the i2c bus on pins 9 and 10
00012 Mpr121 mpr121(&i2c, Mpr121::ADD_VSS); //Setup Mpr121
00013 
00014 /* Global Variables to store Status*/
00015 int new_song_number=1;  //Variable to store the Song Number
00016 int volume_set=-20;     //Variable to store the Volume
00017 int previous_volume;    //Variable to store the volume when muted
00018 bool pause=false;       //Variable to store the status of Pause button 
00019 bool mute=false;        //Variable to store the status of mute button
00020 
00021 int check=0;    //Capacitative touch generates interrupt on both press and release. This variable tracks this and updates only on press.
00022 char *song_name[6]={"18 till I Die","Summer of 69","Boulevard", "Serenity","Crawling","In the end"}; //Array of song names entered manually
00023 
00024 void fallInterrupt() 
00025 {
00026   int key_code=0;
00027   int i=0;
00028   int value;
00029   value=mpr121.read(0x00);
00030   value +=mpr121.read(0x01)<<8;
00031 
00032    i=0;
00033   if(check)
00034     check=0;
00035    else
00036     check=1;
00037   if(check)
00038     {
00039   for (i=0; i<12; i++) {
00040   if (((value>>i)&0x01)==1) key_code=i+1; //Convert value into decimal
00041      }
00042 
00043  switch(key_code)  // Different cases depending on key press
00044  {
00045   case 0:break;  // Invalid entry . Valid 1-12
00046   case 1:   
00047   case 2:  
00048   case 3:  
00049   case 4:    
00050   case 5:     
00051   case 6: new_song_number=key_code; // Play the selected song
00052           break; 
00053   case 7:new_song_number+=1;  // Next song
00054           if(new_song_number==7)
00055            new_song_number=1;
00056           break;
00057   case 8: new_song_number-=1;  // Previous Song
00058           if(new_song_number==0)
00059            new_song_number=6;
00060           break;
00061   case 9: pause=!pause; // Pause/Play button
00062           break;
00063   case 10: volume_set+=3; // Volume Up
00064            if(volume_set>=0)
00065             volume_set=0;
00066            break;
00067   case 11: volume_set-=3;  //Volume Down
00068            if(volume_set<-55)
00069             volume_set=-55;
00070             break;
00071   case 12: mute=!mute;  //Mute/Unmute
00072            if(mute)
00073            {
00074             previous_volume=volume_set; // Attenuation of -55 db is small enough to not hear anything
00075             volume_set=-55;
00076            }
00077            else
00078            {
00079            volume_set=previous_volume;
00080            }
00081            break;
00082   default: lcd1.cls();
00083            lcd1.printf("error");  // exit on error
00084            exit(1);
00085         }
00086  }
00087  /* Print to LCD the status of Song */
00088   lcd1.cls();
00089   if(pause)
00090     lcd1.printf("Paused ");
00091   if(mute)
00092    lcd1.printf("Muted");
00093   if(!mute && !pause)
00094    lcd1.printf("Playing"); 
00095   lcd1.printf("\n %d %s",new_song_number,song_name[new_song_number-1]);
00096   
00097  }
00098 
00099  int main () 
00100  {       
00101      /*============================================================ 
00102       * MP3 Initialising 
00103       *==========================================================*/
00104       
00105      mp3._RST = 1; 
00106      mp3.cs_high();                                  //chip disabled 
00107      mp3.sci_initialise();                           //initialise MBED 
00108      mp3.sci_write(0x00,(SM_SDINEW+SM_STREAM+SM_DIFF)); 
00109      mp3.sci_write(0x03, 0x9800); 
00110      mp3.sdi_initialise();    
00111           
00112       
00113    /* Touch Pad setup */
00114       interrupt.fall(&fallInterrupt);
00115       interrupt.mode(PullUp);
00116 
00117          while(1)
00118          {
00119          mp3.play_song(new_song_number);
00120          }       
00121  
00122  } 
00123  
00124