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@3:7ef908e84ae1, 2014-09-08 (annotated)

Committer:
embeddedartists
Date:
Mon Sep 08 11:34:53 2014 +0000
Revision:
3:7ef908e84ae1
Parent:
2:2f4b7535ceb3
Child:
4:aa34674b6afb
Added audio test. Shortened RGB LED startup sequence and added message for user when uSD card not inserted to explain the long delay.

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 2:2f4b7535ceb3 20
embeddedartists 2:2f4b7535ceb3 21 #include "mbed.h"
embeddedartists 2:2f4b7535ceb3 22 #include "TestAudio.h"
embeddedartists 2:2f4b7535ceb3 23 #include "WM8731.h"
embeddedartists 3:7ef908e84ae1 24 #include "I2S.h"
embeddedartists 3:7ef908e84ae1 25 #include "sound.h"
embeddedartists 2:2f4b7535ceb3 26
embeddedartists 2:2f4b7535ceb3 27 /******************************************************************************
embeddedartists 2:2f4b7535ceb3 28 * Defines and typedefs
embeddedartists 2:2f4b7535ceb3 29 *****************************************************************************/
embeddedartists 2:2f4b7535ceb3 30
embeddedartists 3:7ef908e84ae1 31 #define SAMPLERATE 32000
embeddedartists 3:7ef908e84ae1 32
embeddedartists 3:7ef908e84ae1 33 /******************************************************************************
embeddedartists 3:7ef908e84ae1 34 * Private Functions
embeddedartists 3:7ef908e84ae1 35 *****************************************************************************/
embeddedartists 3:7ef908e84ae1 36
embeddedartists 3:7ef908e84ae1 37 void TestAudio::echo(void) {
embeddedartists 3:7ef908e84ae1 38 int to_read = _i2sRx.fifo_points(); //Find out how many stereo samples to read
embeddedartists 3:7ef908e84ae1 39
embeddedartists 3:7ef908e84ae1 40 //Read 'to_read' number of stereo samples.
embeddedartists 3:7ef908e84ae1 41 _i2sRx.read(_rxBuf, to_read);
embeddedartists 3:7ef908e84ae1 42
embeddedartists 3:7ef908e84ae1 43 //Loop through all stereo samples
embeddedartists 3:7ef908e84ae1 44 for(int i = 0; i < to_read; i+=2) {
embeddedartists 3:7ef908e84ae1 45 // Check if wave-file shall be output
embeddedartists 3:7ef908e84ae1 46 if (_waveIdx > 0)
embeddedartists 3:7ef908e84ae1 47 {
embeddedartists 3:7ef908e84ae1 48 _txBuf[i] = sound_8k[_waveIdx/4] << 5;
embeddedartists 3:7ef908e84ae1 49 _txBuf[i+1] = sound_8k[_waveIdx/4] << 5;
embeddedartists 3:7ef908e84ae1 50
embeddedartists 3:7ef908e84ae1 51 //Increment wave samples pointer and check if all samples have been read, if so, set pointer to zero
embeddedartists 3:7ef908e84ae1 52 _waveIdx++;
embeddedartists 3:7ef908e84ae1 53 if (_waveIdx/4 > sound_sz)
embeddedartists 3:7ef908e84ae1 54 {
embeddedartists 3:7ef908e84ae1 55 _waveIdx = 0;
embeddedartists 3:7ef908e84ae1 56 }
embeddedartists 3:7ef908e84ae1 57 }
embeddedartists 3:7ef908e84ae1 58 //Output delayed version of audio input
embeddedartists 3:7ef908e84ae1 59 else
embeddedartists 3:7ef908e84ae1 60 {
embeddedartists 3:7ef908e84ae1 61 //Echo buffer only contains right side samples (since MIC is used as input, which is a mono input)
embeddedartists 3:7ef908e84ae1 62 //Output is however stereo, so just copy echo bugger to both right and left side for output samples
embeddedartists 3:7ef908e84ae1 63 _txBuf[i] = _echoBuf[_echoBufPtr];
embeddedartists 3:7ef908e84ae1 64 _txBuf[i+1] = _echoBuf[_echoBufPtr];
embeddedartists 3:7ef908e84ae1 65
embeddedartists 3:7ef908e84ae1 66 //Only fill echo buffer with right side samples, i.e., ignore rxBuf[i+1] content
embeddedartists 3:7ef908e84ae1 67 _echoBuf[_echoBufPtr] = _rxBuf[i];
embeddedartists 3:7ef908e84ae1 68 }
embeddedartists 3:7ef908e84ae1 69
embeddedartists 3:7ef908e84ae1 70 //Increment echo buffer write pointer and check for wrap-around
embeddedartists 3:7ef908e84ae1 71 _echoBufPtr++;
embeddedartists 3:7ef908e84ae1 72 if (_echoBufPtr >= ECHOLENGTH)
embeddedartists 3:7ef908e84ae1 73 {
embeddedartists 3:7ef908e84ae1 74 _echoBufPtr = 0;
embeddedartists 3:7ef908e84ae1 75 }
embeddedartists 3:7ef908e84ae1 76 }
embeddedartists 3:7ef908e84ae1 77
embeddedartists 3:7ef908e84ae1 78 //Write samples to output/codec
embeddedartists 3:7ef908e84ae1 79 _i2sTx.write(_txBuf, to_read);
embeddedartists 3:7ef908e84ae1 80 }
embeddedartists 3:7ef908e84ae1 81
embeddedartists 2:2f4b7535ceb3 82 /******************************************************************************
embeddedartists 2:2f4b7535ceb3 83 * Public Functions
embeddedartists 2:2f4b7535ceb3 84 *****************************************************************************/
embeddedartists 2:2f4b7535ceb3 85
embeddedartists 2:2f4b7535ceb3 86 /*
embeddedartists 2:2f4b7535ceb3 87 Prerequisites:
embeddedartists 2:2f4b7535ceb3 88
embeddedartists 2:2f4b7535ceb3 89 - For this test to work jumpers JP8 and JP9 on the LPC4088 Experiment Base Board
embeddedartists 2:2f4b7535ceb3 90 must both be in positions 1-2
embeddedartists 2:2f4b7535ceb3 91
embeddedartists 2:2f4b7535ceb3 92 - MIC cable, Line OUT, Headphone...
embeddedartists 2:2f4b7535ceb3 93 */
embeddedartists 2:2f4b7535ceb3 94
embeddedartists 3:7ef908e84ae1 95 TestAudio::TestAudio() : _codec(P0_27, P0_28), _i2sTx(I2S_TRANSMIT, p11, p12, p13),
embeddedartists 3:7ef908e84ae1 96 _i2sRx(I2S_RECEIVE, p14, p33, p34),_aIn(p15),_waveIdx(0),_echoBufPtr(0) {
embeddedartists 3:7ef908e84ae1 97 }
embeddedartists 3:7ef908e84ae1 98
embeddedartists 2:2f4b7535ceb3 99 bool TestAudio::runTest() {
embeddedartists 2:2f4b7535ceb3 100 printf("Testing audio...\n");
embeddedartists 3:7ef908e84ae1 101
embeddedartists 3:7ef908e84ae1 102 // joystick used for audio selection
embeddedartists 3:7ef908e84ae1 103 DigitalIn up(p32);
embeddedartists 3:7ef908e84ae1 104 DigitalIn down(p38);
embeddedartists 3:7ef908e84ae1 105
embeddedartists 3:7ef908e84ae1 106 _codec.power(true);
embeddedartists 3:7ef908e84ae1 107 _codec.frequency(SAMPLERATE);
embeddedartists 3:7ef908e84ae1 108 _codec.wordsize(16);
embeddedartists 3:7ef908e84ae1 109 _codec.master(true);
embeddedartists 3:7ef908e84ae1 110 _codec.headphone_volume(0.1);
embeddedartists 3:7ef908e84ae1 111 _codec.input_select(WM8731_MIC);
embeddedartists 3:7ef908e84ae1 112 _codec.microphone_boost(false);
embeddedartists 3:7ef908e84ae1 113 _codec.input_mute(false);
embeddedartists 3:7ef908e84ae1 114 _codec.output_mute(false);
embeddedartists 3:7ef908e84ae1 115 _codec.input_power(true);
embeddedartists 3:7ef908e84ae1 116 _codec.output_power(true);
embeddedartists 3:7ef908e84ae1 117 // _codec.sidetone(0.99);
embeddedartists 3:7ef908e84ae1 118 _codec.linein_volume(0.7);
embeddedartists 3:7ef908e84ae1 119 _codec.bypass(true);
embeddedartists 3:7ef908e84ae1 120 _codec.start();
embeddedartists 3:7ef908e84ae1 121
embeddedartists 3:7ef908e84ae1 122 _i2sTx.frequency(SAMPLERATE);
embeddedartists 3:7ef908e84ae1 123 _i2sTx.wordsize(16);
embeddedartists 3:7ef908e84ae1 124 _i2sTx.stereomono(I2S_STEREO);
embeddedartists 3:7ef908e84ae1 125 _i2sTx.masterslave(I2S_SLAVE);
embeddedartists 3:7ef908e84ae1 126 _i2sTx.start();
embeddedartists 3:7ef908e84ae1 127
embeddedartists 3:7ef908e84ae1 128 _i2sRx.frequency(SAMPLERATE);
embeddedartists 3:7ef908e84ae1 129 _i2sRx.wordsize(16);
embeddedartists 3:7ef908e84ae1 130 _i2sRx.stereomono(I2S_STEREO);
embeddedartists 3:7ef908e84ae1 131 _i2sRx.masterslave(I2S_SLAVE);
embeddedartists 3:7ef908e84ae1 132 _i2sRx.attach(this, &TestAudio::echo);
embeddedartists 3:7ef908e84ae1 133 _echoBufPtr = 0;
embeddedartists 3:7ef908e84ae1 134 _waveIdx = 0;
embeddedartists 3:7ef908e84ae1 135 _i2sRx.start();
embeddedartists 3:7ef908e84ae1 136
embeddedartists 3:7ef908e84ae1 137 do
embeddedartists 3:7ef908e84ae1 138 {
embeddedartists 3:7ef908e84ae1 139 //check if joystick-down pressed = play wave-file
embeddedartists 3:7ef908e84ae1 140 if ((down.read() == 0) && (_waveIdx == 0))
embeddedartists 3:7ef908e84ae1 141 _waveIdx = 1;
embeddedartists 3:7ef908e84ae1 142
embeddedartists 3:7ef908e84ae1 143 _codec.headphone_volume(_aIn);
embeddedartists 3:7ef908e84ae1 144 wait(0.05);
embeddedartists 3:7ef908e84ae1 145 } while (up.read() != 0);
embeddedartists 3:7ef908e84ae1 146
embeddedartists 2:2f4b7535ceb3 147 return true;
embeddedartists 2:2f4b7535ceb3 148 }
embeddedartists 2:2f4b7535ceb3 149
embeddedartists 2:2f4b7535ceb3 150