FTSE100.cpp

00001 #include "mbed.h"
00002 #include "EthernetNetIf.h"
00003 #include "HTTPClient.h"
00004 #include "SDHCFileSystem.h"
00005 #include "TLV320.h"
00006 
00007 EthernetNetIf eth;                              //Ethernet object
00008 HTTPClient http;                                //HTTP object
00009 TLV320 audio(p9, p10, 52, p5, p6, p7, p8, p29); //TLV320 object
00010 SDFileSystem sd(p11, p12, p13, p14, "sd");      //SD Card object
00011 InterruptIn volumeSet(p17);                     //Pin to set volume
00012 AnalogIn aIn(p19);                              //Volume control
00013 FILE *infp;                                     //File pointer object
00014 /* Useful buffers and pointers*/
00015 int loadBufferA[512];    
00016 volatile int readPointer = 0;
00017 volatile int theta = 0;
00018 /* Function to control volume */
00019 void setVolume(void){
00020     audio.outputVolume(aIn, aIn);                 //this way we can forget about ADC fluctuations
00021 }
00022 /* Function to send data to TLV320 */
00023 void play(void){ 
00024         audio.write(loadBufferA, readPointer, 8); 
00025         /* Some pointers */ 
00026         readPointer += 8;
00027         readPointer &= 0x1ff;
00028         theta -= 8;
00029 }
00030 /* Function to load buffer from SD Card */
00031 void fillBuffer(FILE *file){
00032     fseek(file, 44, SEEK_SET);                     //skip the header file, to where the data starts
00033     while(!feof(file)){
00034         static volatile int writePointer = 0;
00035         if(theta < 512){
00036             loadBufferA[writePointer] = ((char)(fgetc(file))|((char)fgetc(file)<<8)|((char)fgetc(file)<<16)|((char)fgetc(file)<<24));
00037             /* More pointer fun */
00038             ++theta;
00039             ++writePointer;
00040             writePointer &= 0x1ff;
00041         }
00042     }
00043 }
00044 int main() {
00045     /* Set up audio */
00046     for(int j = 0; j < 512; ++j){
00047         loadBufferA[j] = 0;
00048     }
00049     volumeSet.rise(&setVolume);
00050     audio.power(0x07);
00051     audio.attach(&play);
00052     /* Setup ethernet connection */
00053     EthernetErr ethErr = eth.setup();           
00054     if(ethErr) return -1;
00055     /* Instantiate HTTPStream object */
00056     HTTPText txt;                               
00057     while(1){
00058         char buf[10];
00059         HTTPResult r = http.get("http://www.srcf.ucam.org/~dew35/mbed/v1/dispBoBApp.php", &txt);   //load page into buffer
00060         if(r==HTTP_OK){
00061             string str = txt.gets();                //load web page into string                            
00062             str.copy(buf,9,0);                      //load buffer with chunk of web page
00063             for(int k = 0; k < 10; ++k){            //transform data such that the number corresponds to the correctly labelled file
00064                 if(buf[k] == 0x2E) buf[k] = 10;
00065                 else buf[k] -= 0x30;
00066             }   
00067         }
00068         /* Play intro */
00069         infp = fopen("/sd/11.wav", "r");
00070         audio.start(TRANSMIT);
00071         fillBuffer(infp);
00072         audio.stop(); 
00073         fclose(infp);  
00074         /* Play a file for each number in FTSE100 index */
00075         for(int j = 0; j < 7; ++j){
00076             char strBuf[20];
00077             sprintf(strBuf, "/sd/%d.wav", buf[j]);  //create filename based on index
00078             infp = fopen(strBuf, "r");              //open said file
00079             audio.start(TRANSMIT);                  //play said file
00080             fillBuffer(infp);
00081             audio.stop(); 
00082             fclose(infp); 
00083 
00084         }
00085     }
00086 }
00087