Giles Barton-Owen
A test program for the TLV320, Generates some sine waves.
Dependencies: I2S TLV320 mbed sinelookup
Revision 0:63b7102aab3e, committed 2012-09-19
- Comitter:
- p07gbar
- Date:
- Wed Sep 19 13:18:12 2012 +0000
- Child:
- 1:f1ddb053b49a
- Commit message:
- Working
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/I2S.lib Wed Sep 19 13:18:12 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/p07gbar/code/I2S/#455d5826751b
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TLV320.lib Wed Sep 19 13:18:12 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/p07gbar/code/TLV320/#a68f7c573e8c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Sep 19 13:18:12 2012 +0000
@@ -0,0 +1,85 @@
+#include "mbed.h"
+#include "sinelookup.h"
+#include "TLV320.h"
+#include "I2S.h"
+
+#define SAMPLERATE 48000
+
+
+TLV320 codec(p9, p10);
+I2S i2s(I2S_TRANSMIT, p5, p6, p7);
+
+AnalogIn aIn(p19);
+AnalogIn vol(p20);
+
+float phase_l;
+float phase_r;
+int minibuf[16];
+float skipper;
+float volume;
+float phase_kill;
+
+
+extern "C" void HardFault_Handler()
+{
+ error("Hard Fault!\n");
+}
+
+
+void play(void)
+{
+ int to_write = i2s.max_fifo_points() - (i2s.fifo_points());
+ for(int i = 0; i < to_write; i+=2) {
+ minibuf[i] = int(float(sine16lookup[int(phase_l)])*volume);
+ //minibuf[i] = int(sine16lookup[int(phase_l)]);
+ minibuf[i+1] = int(float(sine16lookup[int(phase_r)])*volume);
+ phase_l+=skipper;
+ phase_r = phase_l + phase_kill;
+ while(phase_l >= SINE16LENGTH) {
+ phase_l -= SINE16LENGTH;
+ }
+
+ while(phase_r >= SINE16LENGTH) {
+ phase_r -= SINE16LENGTH;
+ }
+ while(phase_r< 0) phase_r += SINE16LENGTH;
+ }
+ i2s.write(minibuf, to_write);
+}
+
+/* main */
+int main()
+{
+ skipper = (aIn*49)+1;
+
+ codec.power(true);
+ codec.frequency(SAMPLERATE);
+ codec.wordsize(16);
+ codec.master(false);
+ codec.headphone_volume(0.5);
+ codec.start();
+
+ i2s.frequency(SAMPLERATE);
+ i2s.wordsize(16);
+ i2s.stereomono(I2S_STEREO);
+ i2s.masterslave(I2S_MASTER);
+ i2s.attach(&play);
+ i2s.start();
+
+ while(1)
+ {
+ skipper = (aIn*30)+1;
+
+ volume = 1;
+ phase_kill = (vol-0.5)*400;
+
+ //printf("Skipper:%f, %i, %i\n\r",skipper, to_write,i2s.fifo_level());
+
+ /*if(flag)
+ {
+ printf(".");
+ flag = false;
+ }*/
+ }
+
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Sep 19 13:18:12 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/cd19af002ccc \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/sinelookup.lib Wed Sep 19 13:18:12 2012 +0000 @@ -0,0 +1,1 @@ +sinelookup#9099a1ada151