Giles Barton-Owen / Mbed 2 deprecated TLV320_Write_test

A test program for the TLV320, Generates some sine waves.

Dependencies:   I2S TLV320 mbed sinelookup

main.cpp@0:63b7102aab3e, 2012-09-19 (annotated)

Committer:
p07gbar
Date:
Wed Sep 19 13:18:12 2012 +0000
Revision:
0:63b7102aab3e
Working

Who changed what in which revision?

UserRevisionLine numberNew contents of line
p07gbar 0:63b7102aab3e 1 #include "mbed.h"
p07gbar 0:63b7102aab3e 2 #include "sinelookup.h"
p07gbar 0:63b7102aab3e 3 #include "TLV320.h"
p07gbar 0:63b7102aab3e 4 #include "I2S.h"
p07gbar 0:63b7102aab3e 5
p07gbar 0:63b7102aab3e 6 #define SAMPLERATE 48000
p07gbar 0:63b7102aab3e 7
p07gbar 0:63b7102aab3e 8
p07gbar 0:63b7102aab3e 9 TLV320 codec(p9, p10);
p07gbar 0:63b7102aab3e 10 I2S i2s(I2S_TRANSMIT, p5, p6, p7);
p07gbar 0:63b7102aab3e 11
p07gbar 0:63b7102aab3e 12 AnalogIn aIn(p19);
p07gbar 0:63b7102aab3e 13 AnalogIn vol(p20);
p07gbar 0:63b7102aab3e 14
p07gbar 0:63b7102aab3e 15 float phase_l;
p07gbar 0:63b7102aab3e 16 float phase_r;
p07gbar 0:63b7102aab3e 17 int minibuf[16];
p07gbar 0:63b7102aab3e 18 float skipper;
p07gbar 0:63b7102aab3e 19 float volume;
p07gbar 0:63b7102aab3e 20 float phase_kill;
p07gbar 0:63b7102aab3e 21
p07gbar 0:63b7102aab3e 22
p07gbar 0:63b7102aab3e 23 extern "C" void HardFault_Handler()
p07gbar 0:63b7102aab3e 24 {
p07gbar 0:63b7102aab3e 25 error("Hard Fault!\n");
p07gbar 0:63b7102aab3e 26 }
p07gbar 0:63b7102aab3e 27
p07gbar 0:63b7102aab3e 28
p07gbar 0:63b7102aab3e 29 void play(void)
p07gbar 0:63b7102aab3e 30 {
p07gbar 0:63b7102aab3e 31 int to_write = i2s.max_fifo_points() - (i2s.fifo_points());
p07gbar 0:63b7102aab3e 32 for(int i = 0; i < to_write; i+=2) {
p07gbar 0:63b7102aab3e 33 minibuf[i] = int(float(sine16lookup[int(phase_l)])*volume);
p07gbar 0:63b7102aab3e 34 //minibuf[i] = int(sine16lookup[int(phase_l)]);
p07gbar 0:63b7102aab3e 35 minibuf[i+1] = int(float(sine16lookup[int(phase_r)])*volume);
p07gbar 0:63b7102aab3e 36 phase_l+=skipper;
p07gbar 0:63b7102aab3e 37 phase_r = phase_l + phase_kill;
p07gbar 0:63b7102aab3e 38 while(phase_l >= SINE16LENGTH) {
p07gbar 0:63b7102aab3e 39 phase_l -= SINE16LENGTH;
p07gbar 0:63b7102aab3e 40 }
p07gbar 0:63b7102aab3e 41
p07gbar 0:63b7102aab3e 42 while(phase_r >= SINE16LENGTH) {
p07gbar 0:63b7102aab3e 43 phase_r -= SINE16LENGTH;
p07gbar 0:63b7102aab3e 44 }
p07gbar 0:63b7102aab3e 45 while(phase_r< 0) phase_r += SINE16LENGTH;
p07gbar 0:63b7102aab3e 46 }
p07gbar 0:63b7102aab3e 47 i2s.write(minibuf, to_write);
p07gbar 0:63b7102aab3e 48 }
p07gbar 0:63b7102aab3e 49
p07gbar 0:63b7102aab3e 50 /* main */
p07gbar 0:63b7102aab3e 51 int main()
p07gbar 0:63b7102aab3e 52 {
p07gbar 0:63b7102aab3e 53 skipper = (aIn*49)+1;
p07gbar 0:63b7102aab3e 54
p07gbar 0:63b7102aab3e 55 codec.power(true);
p07gbar 0:63b7102aab3e 56 codec.frequency(SAMPLERATE);
p07gbar 0:63b7102aab3e 57 codec.wordsize(16);
p07gbar 0:63b7102aab3e 58 codec.master(false);
p07gbar 0:63b7102aab3e 59 codec.headphone_volume(0.5);
p07gbar 0:63b7102aab3e 60 codec.start();
p07gbar 0:63b7102aab3e 61
p07gbar 0:63b7102aab3e 62 i2s.frequency(SAMPLERATE);
p07gbar 0:63b7102aab3e 63 i2s.wordsize(16);
p07gbar 0:63b7102aab3e 64 i2s.stereomono(I2S_STEREO);
p07gbar 0:63b7102aab3e 65 i2s.masterslave(I2S_MASTER);
p07gbar 0:63b7102aab3e 66 i2s.attach(&play);
p07gbar 0:63b7102aab3e 67 i2s.start();
p07gbar 0:63b7102aab3e 68
p07gbar 0:63b7102aab3e 69 while(1)
p07gbar 0:63b7102aab3e 70 {
p07gbar 0:63b7102aab3e 71 skipper = (aIn*30)+1;
p07gbar 0:63b7102aab3e 72
p07gbar 0:63b7102aab3e 73 volume = 1;
p07gbar 0:63b7102aab3e 74 phase_kill = (vol-0.5)*400;
p07gbar 0:63b7102aab3e 75
p07gbar 0:63b7102aab3e 76 //printf("Skipper:%f, %i, %i\n\r",skipper, to_write,i2s.fifo_level());
p07gbar 0:63b7102aab3e 77
p07gbar 0:63b7102aab3e 78 /*if(flag)
p07gbar 0:63b7102aab3e 79 {
p07gbar 0:63b7102aab3e 80 printf(".");
p07gbar 0:63b7102aab3e 81 flag = false;
p07gbar 0:63b7102aab3e 82 }*/
p07gbar 0:63b7102aab3e 83 }
p07gbar 0:63b7102aab3e 84
p07gbar 0:63b7102aab3e 85 }