Revision 5:81717d606213, committed 2015-06-02

Comitter:

kairohan

Date:

Tue Jun 02 07:36:15 2015 +0000

Parent:

4:d7e8697d8bd3

Commit message:

v1.0

Changed in this revision

diff -r d7e8697d8bd3 -r 81717d606213 main.cpp
--- a/main.cpp	Fri Mar 01 13:12:35 2013 +0000
+++ b/main.cpp	Tue Jun 02 07:36:15 2015 +0000
@@ -2,7 +2,7 @@
  
 #include "mbed.h"
 #include "USBAudio.h"
- 
+PwmOut led(p22);
 Serial pc(USBTX, USBRX);
  
 // frequency: 48 kHz
@@ -12,23 +12,50 @@
 #define NB_CHA 1
  
 // length of an audio packet: each ms, we receive 48 * 16bits ->48 * 2 bytes. as there is one channel, the length will be 48 * 2 * 1
-#define AUDIO_LENGTH_PACKET 48 * 2 * 1
+#define AUDIO_LENGTH_PACKET FREQ/1000 * 2 * 1
  
 // USBAudio
 USBAudio audio(FREQ, NB_CHA);
+int16_t buf[AUDIO_LENGTH_PACKET/2];
+float bufo[2][AUDIO_LENGTH_PACKET/2];
+bool swb=false,swb2=false;
+int pli=0;
+void Sample_timer_interrupt(void)
+{
+    //static unsigned int i=0;
+ 
+    // send next analog sample out to D to A
+    led = bufo[swb][pli];
+    // increment pointer and wrap around back to 0 at 128
+ pli++;
+    if(pli==(AUDIO_LENGTH_PACKET>>1))pli=0,swb=!swb;
+ //if(i==0)audio.read((uint8_t *)buf);
+}
  
 int main() {
-    int16_t buf[AUDIO_LENGTH_PACKET/2];
-    
+    //int16_t buf[AUDIO_LENGTH_PACKET/2];
+   //led.pulsewidth(0.000000001);
+    led.period(1.0/(96000.0*2));//1.0/(48000.0*16));
+    // set up a timer to be used for sample rate interrupts
+    Ticker Sample_Period;
+      Sample_Period.attach(&Sample_timer_interrupt, 1.0/(FREQ));
+     // audio.read((uint8_t *)buf);
     while (1) {
         // read an audio packet
         audio.read((uint8_t *)buf);
- 
+        float vol=audio.getVolume();
         // print packet received
-        pc.printf("recv: ");
-        for(int i = 0; i < AUDIO_LENGTH_PACKET/2; i++) {
-            pc.printf("%d ", buf[i]);
-        }
-        pc.printf("\r\n");
+        //pc.printf("recv: ");
+        //swb2=false;
+        for(int i = 0; i < (AUDIO_LENGTH_PACKET>>1); i++) {
+          bufo[!swb][i]=((float)buf[i]*vol/510.0)+0.5;}
+          pli=0;
+          //swb2=true;
+          //  led = (float)buf[i]/128.0;
+            //pc.printf("%d ", buf[i]);
+           // led=(float)buf[i]/128.0;
+       // }
+       // pc.printf("\r\n");
     }
+    
 }
\ No newline at end of file