EmbeddedArtists AB / Mbed 2 deprecated lpc4088_ebb_ptp

Production Test Program (PTP) for the LPC4088 Experiment Base Board

Dependencies:   EALib I2S LM75B SDFileSystem mbed

TestAudio.cpp@9:eb6086159020, 2014-10-01 (annotated)

Committer:
embeddedartists
Date:
Wed Oct 01 11:16:38 2014 +0000
Revision:
9:eb6086159020
Parent:
7:48375cb50f3a 
Updated used libraries

Who changed what in which revision?

UserRevisionLine numberNew contents of line
embeddedartists 2:2f4b7535ceb3 1 /*
embeddedartists 2:2f4b7535ceb3 2 * Copyright 2013 Embedded Artists AB
embeddedartists 2:2f4b7535ceb3 3 *
embeddedartists 2:2f4b7535ceb3 4 * Licensed under the Apache License, Version 2.0 (the "License");
embeddedartists 2:2f4b7535ceb3 5 * you may not use this file except in compliance with the License.
embeddedartists 2:2f4b7535ceb3 6 * You may obtain a copy of the License at
embeddedartists 2:2f4b7535ceb3 7 *
embeddedartists 2:2f4b7535ceb3 8 * http://www.apache.org/licenses/LICENSE-2.0
embeddedartists 2:2f4b7535ceb3 9 *
embeddedartists 2:2f4b7535ceb3 10 * Unless required by applicable law or agreed to in writing, software
embeddedartists 2:2f4b7535ceb3 11 * distributed under the License is distributed on an "AS IS" BASIS,
embeddedartists 2:2f4b7535ceb3 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
embeddedartists 2:2f4b7535ceb3 13 * See the License for the specific language governing permissions and
embeddedartists 2:2f4b7535ceb3 14 * limitations under the License.
embeddedartists 2:2f4b7535ceb3 15 */
embeddedartists 2:2f4b7535ceb3 16
embeddedartists 2:2f4b7535ceb3 17 /******************************************************************************
embeddedartists 2:2f4b7535ceb3 18 * Includes
embeddedartists 2:2f4b7535ceb3 19 *****************************************************************************/
embeddedartists 4:aa34674b6afb 20 //#define SOUND_8KHZ
embeddedartists 2:2f4b7535ceb3 21
embeddedartists 2:2f4b7535ceb3 22 #include "mbed.h"
embeddedartists 2:2f4b7535ceb3 23 #include "TestAudio.h"
embeddedartists 2:2f4b7535ceb3 24 #include "WM8731.h"
embeddedartists 3:7ef908e84ae1 25 #include "I2S.h"
embeddedartists 3:7ef908e84ae1 26 #include "sound.h"
embeddedartists 2:2f4b7535ceb3 27
embeddedartists 2:2f4b7535ceb3 28 /******************************************************************************
embeddedartists 2:2f4b7535ceb3 29 * Defines and typedefs
embeddedartists 2:2f4b7535ceb3 30 *****************************************************************************/
embeddedartists 2:2f4b7535ceb3 31
embeddedartists 3:7ef908e84ae1 32 #define SAMPLERATE 32000
embeddedartists 3:7ef908e84ae1 33
embeddedartists 3:7ef908e84ae1 34 /******************************************************************************
embeddedartists 3:7ef908e84ae1 35 * Private Functions
embeddedartists 3:7ef908e84ae1 36 *****************************************************************************/
embeddedartists 3:7ef908e84ae1 37
embeddedartists 3:7ef908e84ae1 38 void TestAudio::echo(void) {
embeddedartists 3:7ef908e84ae1 39 int to_read = _i2sRx.fifo_points(); //Find out how many stereo samples to read
embeddedartists 3:7ef908e84ae1 40
embeddedartists 3:7ef908e84ae1 41 //Read 'to_read' number of stereo samples.
embeddedartists 3:7ef908e84ae1 42 _i2sRx.read(_rxBuf, to_read);
embeddedartists 3:7ef908e84ae1 43
embeddedartists 3:7ef908e84ae1 44 //Loop through all stereo samples
embeddedartists 3:7ef908e84ae1 45 for(int i = 0; i < to_read; i+=2) {
embeddedartists 3:7ef908e84ae1 46 // Check if wave-file shall be output
embeddedartists 3:7ef908e84ae1 47 if (_waveIdx > 0)
embeddedartists 3:7ef908e84ae1 48 {
embeddedartists 4:aa34674b6afb 49 #if SOUND_8KHZ
embeddedartists 4:aa34674b6afb 50 int sample = sound_8k[_waveIdx/4] << 5
embeddedartists 4:aa34674b6afb 51 _txBuf[i] = sample;
embeddedartists 4:aa34674b6afb 52 _txBuf[i+1] = sample;
embeddedartists 4:aa34674b6afb 53 _echoBuf[_echoBufPtr] = _rxBuf[i];
embeddedartists 3:7ef908e84ae1 54
embeddedartists 3:7ef908e84ae1 55 //Increment wave samples pointer and check if all samples have been read, if so, set pointer to zero
embeddedartists 3:7ef908e84ae1 56 _waveIdx++;
embeddedartists 3:7ef908e84ae1 57 if (_waveIdx/4 > sound_sz)
embeddedartists 3:7ef908e84ae1 58 {
embeddedartists 3:7ef908e84ae1 59 _waveIdx = 0;
embeddedartists 3:7ef908e84ae1 60 }
embeddedartists 4:aa34674b6afb 61 #else
embeddedartists 4:aa34674b6afb 62 int sample = (unsigned int)sound_32k[_waveIdx] | (((unsigned int)sound_32k[_waveIdx+1]) << 8);
embeddedartists 4:aa34674b6afb 63 _txBuf[i] = sample;
embeddedartists 4:aa34674b6afb 64 _txBuf[i+1] = sample;
embeddedartists 4:aa34674b6afb 65 _echoBuf[_echoBufPtr] = _rxBuf[i];
embeddedartists 4:aa34674b6afb 66
embeddedartists 4:aa34674b6afb 67 //Increment wave samples pointer and check if all samples have been read, if so, set pointer to zero
embeddedartists 4:aa34674b6afb 68 _waveIdx += 2;
embeddedartists 4:aa34674b6afb 69 if (_waveIdx > sound_sz)
embeddedartists 4:aa34674b6afb 70 {
embeddedartists 4:aa34674b6afb 71 _waveIdx = 0;
embeddedartists 4:aa34674b6afb 72 }
embeddedartists 4:aa34674b6afb 73 #endif
embeddedartists 3:7ef908e84ae1 74 }
embeddedartists 3:7ef908e84ae1 75 //Output delayed version of audio input
embeddedartists 3:7ef908e84ae1 76 else
embeddedartists 3:7ef908e84ae1 77 {
embeddedartists 3:7ef908e84ae1 78 //Echo buffer only contains right side samples (since MIC is used as input, which is a mono input)
embeddedartists 3:7ef908e84ae1 79 //Output is however stereo, so just copy echo bugger to both right and left side for output samples
embeddedartists 3:7ef908e84ae1 80 _txBuf[i] = _echoBuf[_echoBufPtr];
embeddedartists 3:7ef908e84ae1 81 _txBuf[i+1] = _echoBuf[_echoBufPtr];
embeddedartists 3:7ef908e84ae1 82
embeddedartists 3:7ef908e84ae1 83 //Only fill echo buffer with right side samples, i.e., ignore rxBuf[i+1] content
embeddedartists 3:7ef908e84ae1 84 _echoBuf[_echoBufPtr] = _rxBuf[i];
embeddedartists 3:7ef908e84ae1 85 }
embeddedartists 3:7ef908e84ae1 86
embeddedartists 3:7ef908e84ae1 87 //Increment echo buffer write pointer and check for wrap-around
embeddedartists 3:7ef908e84ae1 88 _echoBufPtr++;
embeddedartists 3:7ef908e84ae1 89 if (_echoBufPtr >= ECHOLENGTH)
embeddedartists 3:7ef908e84ae1 90 {
embeddedartists 3:7ef908e84ae1 91 _echoBufPtr = 0;
embeddedartists 3:7ef908e84ae1 92 }
embeddedartists 3:7ef908e84ae1 93 }
embeddedartists 3:7ef908e84ae1 94
embeddedartists 3:7ef908e84ae1 95 //Write samples to output/codec
embeddedartists 3:7ef908e84ae1 96 _i2sTx.write(_txBuf, to_read);
embeddedartists 3:7ef908e84ae1 97 }
embeddedartists 3:7ef908e84ae1 98
embeddedartists 2:2f4b7535ceb3 99 /******************************************************************************
embeddedartists 2:2f4b7535ceb3 100 * Public Functions
embeddedartists 2:2f4b7535ceb3 101 *****************************************************************************/
embeddedartists 2:2f4b7535ceb3 102
embeddedartists 2:2f4b7535ceb3 103 /*
embeddedartists 2:2f4b7535ceb3 104 Prerequisites:
embeddedartists 2:2f4b7535ceb3 105
embeddedartists 2:2f4b7535ceb3 106 - For this test to work jumpers JP8 and JP9 on the LPC4088 Experiment Base Board
embeddedartists 2:2f4b7535ceb3 107 must both be in positions 1-2
embeddedartists 2:2f4b7535ceb3 108
embeddedartists 2:2f4b7535ceb3 109 - MIC cable, Line OUT, Headphone...
embeddedartists 2:2f4b7535ceb3 110 */
embeddedartists 2:2f4b7535ceb3 111
embeddedartists 3:7ef908e84ae1 112 TestAudio::TestAudio() : _codec(P0_27, P0_28), _i2sTx(I2S_TRANSMIT, p11, p12, p13),
embeddedartists 3:7ef908e84ae1 113 _i2sRx(I2S_RECEIVE, p14, p33, p34),_aIn(p15),_waveIdx(0),_echoBufPtr(0) {
embeddedartists 3:7ef908e84ae1 114 }
embeddedartists 3:7ef908e84ae1 115
embeddedartists 2:2f4b7535ceb3 116 bool TestAudio::runTest() {
embeddedartists 4:aa34674b6afb 117 printf("Testing audio... Exit by pressing joystick up\n");
embeddedartists 5:3eb61b96b6ac 118 printf("Joystick down = play short wave-file. Joystick right/left = turn microphone boost on/off\n");
embeddedartists 3:7ef908e84ae1 119
embeddedartists 3:7ef908e84ae1 120 // joystick used for audio selection
embeddedartists 3:7ef908e84ae1 121 DigitalIn up(p32);
embeddedartists 3:7ef908e84ae1 122 DigitalIn down(p38);
embeddedartists 4:aa34674b6afb 123 DigitalIn left(p39);
embeddedartists 4:aa34674b6afb 124 DigitalIn right(p37);
embeddedartists 3:7ef908e84ae1 125
embeddedartists 6:4d97917c7dea 126 for(int i=0; i<ECHOLENGTH; i++)
embeddedartists 6:4d97917c7dea 127 _echoBuf[i] = 0;
embeddedartists 6:4d97917c7dea 128
embeddedartists 3:7ef908e84ae1 129 _codec.power(true);
embeddedartists 3:7ef908e84ae1 130 _codec.frequency(SAMPLERATE);
embeddedartists 3:7ef908e84ae1 131 _codec.wordsize(16);
embeddedartists 3:7ef908e84ae1 132 _codec.master(true);
embeddedartists 3:7ef908e84ae1 133 _codec.headphone_volume(0.1);
embeddedartists 3:7ef908e84ae1 134 _codec.input_select(WM8731_MIC);
embeddedartists 4:aa34674b6afb 135 _codec.microphone_boost(true);
embeddedartists 3:7ef908e84ae1 136 _codec.input_mute(false);
embeddedartists 3:7ef908e84ae1 137 _codec.output_mute(false);
embeddedartists 3:7ef908e84ae1 138 _codec.input_power(true);
embeddedartists 3:7ef908e84ae1 139 _codec.output_power(true);
embeddedartists 3:7ef908e84ae1 140 _codec.linein_volume(0.7);
embeddedartists 3:7ef908e84ae1 141 _codec.bypass(true);
embeddedartists 3:7ef908e84ae1 142 _codec.start();
embeddedartists 3:7ef908e84ae1 143
embeddedartists 4:aa34674b6afb 144 _i2sRx.frequency(SAMPLERATE);
embeddedartists 4:aa34674b6afb 145 _i2sRx.wordsize(16);
embeddedartists 4:aa34674b6afb 146 _i2sRx.stereomono(I2S_STEREO);
embeddedartists 4:aa34674b6afb 147 _i2sRx.masterslave(I2S_SLAVE);
embeddedartists 4:aa34674b6afb 148 _i2sRx.attach(this, &TestAudio::echo);
embeddedartists 4:aa34674b6afb 149 _i2sRx.set_interrupt_fifo_level(1);
embeddedartists 4:aa34674b6afb 150 _echoBufPtr = 0;
embeddedartists 4:aa34674b6afb 151 _waveIdx = 0;
embeddedartists 4:aa34674b6afb 152 _i2sRx.start();
embeddedartists 4:aa34674b6afb 153
embeddedartists 3:7ef908e84ae1 154 _i2sTx.frequency(SAMPLERATE);
embeddedartists 3:7ef908e84ae1 155 _i2sTx.wordsize(16);
embeddedartists 3:7ef908e84ae1 156 _i2sTx.stereomono(I2S_STEREO);
embeddedartists 3:7ef908e84ae1 157 _i2sTx.masterslave(I2S_SLAVE);
embeddedartists 3:7ef908e84ae1 158 _i2sTx.start();
embeddedartists 3:7ef908e84ae1 159
embeddedartists 7:48375cb50f3a 160 int lastVol = -1000; // value not important
embeddedartists 3:7ef908e84ae1 161 do
embeddedartists 3:7ef908e84ae1 162 {
embeddedartists 3:7ef908e84ae1 163 //check if joystick-down pressed = play wave-file
embeddedartists 3:7ef908e84ae1 164 if ((down.read() == 0) && (_waveIdx == 0))
embeddedartists 4:aa34674b6afb 165 _waveIdx = 2;
embeddedartists 4:aa34674b6afb 166
embeddedartists 4:aa34674b6afb 167 //check if joystick-left pressed = turn off microphone boost
embeddedartists 4:aa34674b6afb 168 if (left.read() == 0)
embeddedartists 4:aa34674b6afb 169 {
embeddedartists 4:aa34674b6afb 170 _codec.input_mute(true);
embeddedartists 4:aa34674b6afb 171 wait(0.2);
embeddedartists 4:aa34674b6afb 172 _codec.microphone_boost(false);
embeddedartists 4:aa34674b6afb 173 wait(0.2);
embeddedartists 4:aa34674b6afb 174 _codec.input_mute(false);
embeddedartists 4:aa34674b6afb 175 }
embeddedartists 4:aa34674b6afb 176
embeddedartists 4:aa34674b6afb 177 //check if joystick-right pressed = turn on microphone boost
embeddedartists 4:aa34674b6afb 178 if (right.read() == 0)
embeddedartists 4:aa34674b6afb 179 {
embeddedartists 4:aa34674b6afb 180 _codec.input_mute(true);
embeddedartists 4:aa34674b6afb 181 wait(0.2);
embeddedartists 4:aa34674b6afb 182 _codec.microphone_boost(true);
embeddedartists 4:aa34674b6afb 183 wait(0.2);
embeddedartists 4:aa34674b6afb 184 _codec.input_mute(false);
embeddedartists 4:aa34674b6afb 185 }
embeddedartists 3:7ef908e84ae1 186
embeddedartists 7:48375cb50f3a 187 //attempt to filter out the small variations in analog values and
embeddedartists 7:48375cb50f3a 188 //only update volume when a "large enough" change is detected.
embeddedartists 7:48375cb50f3a 189 float v = _aIn;
embeddedartists 7:48375cb50f3a 190 int val = ((int)(v*1000))>>2;
embeddedartists 7:48375cb50f3a 191 if (val != lastVol) {
embeddedartists 7:48375cb50f3a 192 _codec.headphone_volume(v);
embeddedartists 7:48375cb50f3a 193 lastVol = val;
embeddedartists 7:48375cb50f3a 194 }
embeddedartists 7:48375cb50f3a 195 //_codec.headphone_volume(_aIn);
embeddedartists 4:aa34674b6afb 196 wait(0.25);
embeddedartists 3:7ef908e84ae1 197 } while (up.read() != 0);
embeddedartists 4:aa34674b6afb 198
embeddedartists 4:aa34674b6afb 199 _codec.power(false);
embeddedartists 2:2f4b7535ceb3 200 return true;
embeddedartists 2:2f4b7535ceb3 201 }
embeddedartists 2:2f4b7535ceb3 202
embeddedartists 2:2f4b7535ceb3 203