Diff: main.cpp

Revision:

3:762585288ed5

Parent:

0:eb53799c0b97

--- a/main.cpp	Fri Mar 01 13:22:17 2013 +0000
+++ b/main.cpp	Tue Dec 01 09:10:31 2015 +0000
@@ -1,40 +1,34 @@
-// Playback example with the USBAUDIO library
-
 #include "mbed.h"
 #include "USBAudio.h"
 
-// frequency: 48 kHz
-#define FREQ_SPK 48000
-#define FREQ_MIC 48000
+#define FREQ                    48000
+#define NUMBER_CHANNEL          2
+#define LENGTH_AUDIO_PACKET     (FREQ / 500) * NUMBER_CHANNEL
+
+// USB Audio object
+USBAudio audio(FREQ, NUMBER_CHANNEL, FREQ, NUMBER_CHANNEL, 0xab45, 0x0378);
 
-// 2channels: stereo
-#define NB_CHA_SPK 2
-#define NB_CHA_MIC 2
+// Analog input objects
+AnalogIn pot0(p17);
+AnalogIn pot1(p18);
 
-// length computed: each ms, we receive 48 * 16bits ->48 * 2 bytes. as there are two channels, the length will be 48 * 2 * 2
-#define LENGTH_AUDIO_PACKET_SPK (FREQ_SPK / 500) * NB_CHA_SPK
-#define LENGTH_AUDIO_PACKET_MIC (FREQ_MIC / 500) * NB_CHA_MIC
-
-// USBAudio object
-USBAudio audio(FREQ_SPK, NB_CHA_SPK, FREQ_MIC, NB_CHA_MIC, 0xab45, 0x0378);
+// Input and output buffers
+int16_t buf_in[LENGTH_AUDIO_PACKET/sizeof(int16_t)][2];
+int16_t buf_out[LENGTH_AUDIO_PACKET/sizeof(int16_t)][2];
 
-int main() {
-    // buffer of int
-    int buf_in[LENGTH_AUDIO_PACKET_SPK/sizeof(int)];
-    int buf_out[LENGTH_AUDIO_PACKET_MIC/sizeof(int)];
-    int * stream_out = buf_in;
-    int * stream_in = buf_out;
-    int * tmp = NULL;
+int main()
+{
+    while (1)
+    {
+        // read and write one audio packet each frame
+        audio.readWrite((uint8_t *)buf_in, (uint8_t *)buf_out);
+        
+        int16_t analog_input[2] = {pot0.read_u16() / 64, pot1.read_u16() / 64};
 
-    while (1) {
-        // read and write one audio packet each frame
-        audio.readWrite((uint8_t *)stream_in, (uint8_t *)stream_out);
-        
-        // swap the buffers
-        tmp = stream_in;
-        stream_in = stream_out;
-        stream_out = tmp;
+        for (int i = 0; i < LENGTH_AUDIO_PACKET/sizeof(int16_t); i++)
+        {
+            buf_out[i][0] = analog_input[0];
+            buf_out[i][1] = analog_input[1];
+        }
     }
 }
-
-