Rory Hand / Mbed 2 deprecated Wolfson_3_wav

does not work yet. Sound starts but then stops after a few seconds, whole thing hangs. Published so as I can import through mbed CLI.

Dependencies:   mbed sinelookup SDFileSystem_Copy_of_mbed_version I2S

Files at this revision

API Documentation at this revision

Revision 4:1a9482a07ee2, committed 2018-10-06

Comitter:
roryhand
Date:
Sat Oct 06 11:51:23 2018 +0000
Parent:
3:6fba0a044d85
Child:
5:5b120a2d9249
Commit message:
plays a very bad quality sound out through i2s WITHOUT using interrupt routine. not really sure why....;

Changed in this revision

wolfson_3_wav.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/wolfson_3_wav.cpp	Sat Oct 06 11:34:37 2018 +0000
+++ b/wolfson_3_wav.cpp	Sat Oct 06 11:51:23 2018 +0000
@@ -69,13 +69,15 @@
     buffer[0] = (*data_sptr)>>1;
     myled = 1;
     int bufflen = sizeof(buffer);
+    printf("buffer data:  %d \n\r",buffer);
+    printf("data_sptr data:  %d \n\r",data_sptr);
     //t.start();
     //buffer[0] = (int*)data_sptr;
     //buffer[0] = newvar;
     //buffer[0] = sine16lookup[i];//>>1;//sine16lookup[i];//scale down volume a bit on amp//how would this scale down the volume a bit??
     //buffer[0] = *fp;
     //printf("value: %d",data_sptr);
-    i2s.write(buffer, bufflen);//Send next PWM value to amp
+    i2s.write(data_sptr, bufflen);//Send next PWM value to amp
     //t.stop();
     //printf("The time taken was %f seconds\n", t.read());
     myled = 0;
@@ -328,7 +330,7 @@
     printf("chunk_size - sizeof(wav_format) %d\n\r",wav_data.subchunk2_size-sizeof(wav_format));
     printf("sizeof(wav_format): %d\n\r",sizeof(wav_format));
     printf("do we egt to this point:\n\r");
-    sampletick.attach(&isr,1/96000);
+    //sampletick.attach(&isr,1/96000);
     //while(!feof(my_wav)){
     //while(1){
         //if (wav_data.subchunk2_size > sizeof(wav_format)){
@@ -388,6 +390,7 @@
                         slice_value+=32768;
                         break;
           }
+          i2s.write(data_sptr,2);
           //t.stop();
           //printf("The time taken was %f seconds\n", t.read());
     }