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Production Test Program (PTP) for the LPC4088 Experiment Base Board
Dependencies: EALib I2S LM75B SDFileSystem mbed
TestAudio.cpp
- Committer:
- embeddedartists
- Date:
- 2014-09-08
- Revision:
- 3:7ef908e84ae1
- Parent:
- 2:2f4b7535ceb3
- Child:
- 4:aa34674b6afb
File content as of revision 3:7ef908e84ae1:
/* * Copyright 2013 Embedded Artists AB * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /****************************************************************************** * Includes *****************************************************************************/ #include "mbed.h" #include "TestAudio.h" #include "WM8731.h" #include "I2S.h" #include "sound.h" /****************************************************************************** * Defines and typedefs *****************************************************************************/ #define SAMPLERATE 32000 /****************************************************************************** * Private Functions *****************************************************************************/ void TestAudio::echo(void) { int to_read = _i2sRx.fifo_points(); //Find out how many stereo samples to read //Read 'to_read' number of stereo samples. _i2sRx.read(_rxBuf, to_read); //Loop through all stereo samples for(int i = 0; i < to_read; i+=2) { // Check if wave-file shall be output if (_waveIdx > 0) { _txBuf[i] = sound_8k[_waveIdx/4] << 5; _txBuf[i+1] = sound_8k[_waveIdx/4] << 5; //Increment wave samples pointer and check if all samples have been read, if so, set pointer to zero _waveIdx++; if (_waveIdx/4 > sound_sz) { _waveIdx = 0; } } //Output delayed version of audio input else { //Echo buffer only contains right side samples (since MIC is used as input, which is a mono input) //Output is however stereo, so just copy echo bugger to both right and left side for output samples _txBuf[i] = _echoBuf[_echoBufPtr]; _txBuf[i+1] = _echoBuf[_echoBufPtr]; //Only fill echo buffer with right side samples, i.e., ignore rxBuf[i+1] content _echoBuf[_echoBufPtr] = _rxBuf[i]; } //Increment echo buffer write pointer and check for wrap-around _echoBufPtr++; if (_echoBufPtr >= ECHOLENGTH) { _echoBufPtr = 0; } } //Write samples to output/codec _i2sTx.write(_txBuf, to_read); } /****************************************************************************** * Public Functions *****************************************************************************/ /* Prerequisites: - For this test to work jumpers JP8 and JP9 on the LPC4088 Experiment Base Board must both be in positions 1-2 - MIC cable, Line OUT, Headphone... */ TestAudio::TestAudio() : _codec(P0_27, P0_28), _i2sTx(I2S_TRANSMIT, p11, p12, p13), _i2sRx(I2S_RECEIVE, p14, p33, p34),_aIn(p15),_waveIdx(0),_echoBufPtr(0) { } bool TestAudio::runTest() { printf("Testing audio...\n"); // joystick used for audio selection DigitalIn up(p32); DigitalIn down(p38); _codec.power(true); _codec.frequency(SAMPLERATE); _codec.wordsize(16); _codec.master(true); _codec.headphone_volume(0.1); _codec.input_select(WM8731_MIC); _codec.microphone_boost(false); _codec.input_mute(false); _codec.output_mute(false); _codec.input_power(true); _codec.output_power(true); // _codec.sidetone(0.99); _codec.linein_volume(0.7); _codec.bypass(true); _codec.start(); _i2sTx.frequency(SAMPLERATE); _i2sTx.wordsize(16); _i2sTx.stereomono(I2S_STEREO); _i2sTx.masterslave(I2S_SLAVE); _i2sTx.start(); _i2sRx.frequency(SAMPLERATE); _i2sRx.wordsize(16); _i2sRx.stereomono(I2S_STEREO); _i2sRx.masterslave(I2S_SLAVE); _i2sRx.attach(this, &TestAudio::echo); _echoBufPtr = 0; _waveIdx = 0; _i2sRx.start(); do { //check if joystick-down pressed = play wave-file if ((down.read() == 0) && (_waveIdx == 0)) _waveIdx = 1; _codec.headphone_volume(_aIn); wait(0.05); } while (up.read() != 0); return true; }