Diff: FTSE100.cpp

Revision:

0:e1324d2fc338

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FTSE100.cpp	Fri Aug 05 13:05:52 2011 +0000
@@ -0,0 +1,87 @@
+#include "mbed.h"
+#include "EthernetNetIf.h"
+#include "HTTPClient.h"
+#include "SDHCFileSystem.h"
+#include "TLV320.h"
+
+EthernetNetIf eth;                              //Ethernet object
+HTTPClient http;                                //HTTP object
+TLV320 audio(p9, p10, 52, p5, p6, p7, p8, p29); //TLV320 object
+SDFileSystem sd(p11, p12, p13, p14, "sd");      //SD Card object
+InterruptIn volumeSet(p17);                     //Pin to set volume
+AnalogIn aIn(p19);                              //Volume control
+FILE *infp;                                     //File pointer object
+/* Useful buffers and pointers*/
+int loadBufferA[512];    
+volatile int readPointer = 0;
+volatile int theta = 0;
+/* Function to control volume */
+void setVolume(void){
+    audio.outputVolume(aIn, aIn);                 //this way we can forget about ADC fluctuations
+}
+/* Function to send data to TLV320 */
+void play(void){ 
+        audio.write(loadBufferA, readPointer, 8); 
+        /* Some pointers */ 
+        readPointer += 8;
+        readPointer &= 0x1ff;
+        theta -= 8;
+}
+/* Function to load buffer from SD Card */
+void fillBuffer(FILE *file){
+    fseek(file, 44, SEEK_SET);                     //skip the header file, to where the data starts
+    while(!feof(file)){
+        static volatile int writePointer = 0;
+        if(theta < 512){
+            loadBufferA[writePointer] = ((char)(fgetc(file))|((char)fgetc(file)<<8)|((char)fgetc(file)<<16)|((char)fgetc(file)<<24));
+            /* More pointer fun */
+            ++theta;
+            ++writePointer;
+            writePointer &= 0x1ff;
+        }
+    }
+}
+int main() {
+    /* Set up audio */
+    for(int j = 0; j < 512; ++j){
+        loadBufferA[j] = 0;
+    }
+    volumeSet.rise(&setVolume);
+    audio.power(0x07);
+    audio.attach(&play);
+    /* Setup ethernet connection */
+    EthernetErr ethErr = eth.setup();           
+    if(ethErr) return -1;
+    /* Instantiate HTTPStream object */
+    HTTPText txt;                               
+    while(1){
+        char buf[10];
+        HTTPResult r = http.get("http://www.srcf.ucam.org/~dew35/mbed/v1/dispBoBApp.php", &txt);   //load page into buffer
+        if(r==HTTP_OK){
+            string str = txt.gets();                //load web page into string                            
+            str.copy(buf,9,0);                      //load buffer with chunk of web page
+            for(int k = 0; k < 10; ++k){            //transform data such that the number corresponds to the correctly labelled file
+                if(buf[k] == 0x2E) buf[k] = 10;
+                else buf[k] -= 0x30;
+            }   
+        }
+        /* Play intro */
+        infp = fopen("/sd/11.wav", "r");
+        audio.start(TRANSMIT);
+        fillBuffer(infp);
+        audio.stop(); 
+        fclose(infp);  
+        /* Play a file for each number in FTSE100 index */
+        for(int j = 0; j < 7; ++j){
+            char strBuf[20];
+            sprintf(strBuf, "/sd/%d.wav", buf[j]);  //create filename based on index
+            infp = fopen(strBuf, "r");              //open said file
+            audio.start(TRANSMIT);                  //play said file
+            fillBuffer(infp);
+            audio.stop(); 
+            fclose(infp); 
+
+        }
+    }
+}
+