ST / X_NUCLEO_CCA02M1

Library to handle the X-NUCLEO-CCA02M1 MEMS Microphones Expansion Board.

Dependencies:   ST_I2S ST_FREQUENCY_DIVIDER USBDEVICE

Dependents:   HelloWorld_CCA02M1 HelloWorld_CCA02M1_mbedOS HelloWorld_CCA02M1 Karaoke_CCA01M1_CCA02M1_mbedOS

Fork of X_NUCLEO_CCA02M1 by ST Expansion SW Team

MEMS Microphones Library

Library to handle the X-NUCLEO-CCA02M1 MEMS Microphones Expansion Board. A single board allows to record a standard 2-channel stereo signal as an array of PCM samples (16 bit/sample); in principle, it could make use of six additional MEMS microphones to realize a 8-channel audio system.


Microphones configuration

Currently the configurations supported are the following:

  • Stereo@48KHz
  • Stereo@44.1KHz (CD audio quality)
  • Stereo@32KHz
  • Stereo@16KHz
  • Stereo@8KHz
  • Mono@48KHz
  • Mono@44.1KHz
  • Mono@32KHz
  • Mono@16KHz
  • Mono@8KHz

Mono configurations need a Jumper connecting PB_5 and PB_13 on the Morpho connector to properly work.


Platform compatibility

  • This board can be currently used with the Nucleo F4 Family only, please see the ST_I2S library compatibility for further information.
  • The library is compatible both with mbed OS 5.x and mbed classic 2.x (to work with mbed classic, the main application has to import the "events" library, which is not included into the "mbed" library).


I2S Peripheral Usage

By default this board makes use of the I2S peripheral available on Nucleo boards.


Acquiring through the USB

In order to acquire the recorded PCM audio channel with an audio SW on a PC, please connect the expansion board to a USB port of the PC, and the Nucleo board to a USB power supply.

BSP/XNucleoCCA02M1.cpp@20:9952bef19da1, 2017-05-05 (annotated)

Committer:
Davidroid
Date:
Fri May 05 11:34:10 2017 +0000
Revision:
20:9952bef19da1
Parent:
19:1a061e306cc9 
Simplifying code.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
davide.aliprandi@st.com 2:9f389fd8fb2e 1 /**
davide.aliprandi@st.com 2:9f389fd8fb2e 2 ******************************************************************************
davide.aliprandi@st.com 2:9f389fd8fb2e 3 * @file XNucleoCCA02M1.cpp
davide.aliprandi@st.com 2:9f389fd8fb2e 4 * @author AST / Software Platforms and Cloud
davide.aliprandi@st.com 2:9f389fd8fb2e 5 * @version V1.0
davide.aliprandi@st.com 2:9f389fd8fb2e 6 * @date October 17th, 2016
davide.aliprandi@st.com 2:9f389fd8fb2e 7 * @brief Implementation file for the X_NUCLEO_CCA02M1 expansion board.
davide.aliprandi@st.com 2:9f389fd8fb2e 8 ******************************************************************************
davide.aliprandi@st.com 2:9f389fd8fb2e 9 * @attention
davide.aliprandi@st.com 2:9f389fd8fb2e 10 *
davide.aliprandi@st.com 2:9f389fd8fb2e 11 * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
davide.aliprandi@st.com 2:9f389fd8fb2e 12 *
davide.aliprandi@st.com 2:9f389fd8fb2e 13 * Redistribution and use in source and binary forms, with or without modification,
davide.aliprandi@st.com 2:9f389fd8fb2e 14 * are permitted provided that the following conditions are met:
davide.aliprandi@st.com 2:9f389fd8fb2e 15 * 1. Redistributions of source code must retain the above copyright notice,
davide.aliprandi@st.com 2:9f389fd8fb2e 16 * this list of conditions and the following disclaimer.
davide.aliprandi@st.com 2:9f389fd8fb2e 17 * 2. Redistributions in binary form must reproduce the above copyright notice,
davide.aliprandi@st.com 2:9f389fd8fb2e 18 * this list of conditions and the following disclaimer in the documentation
davide.aliprandi@st.com 2:9f389fd8fb2e 19 * and/or other materials provided with the distribution.
davide.aliprandi@st.com 2:9f389fd8fb2e 20 * 3. Neither the name of STMicroelectronics nor the names of its contributors
davide.aliprandi@st.com 2:9f389fd8fb2e 21 * may be used to endorse or promote products derived from this software
davide.aliprandi@st.com 2:9f389fd8fb2e 22 * without specific prior written permission.
davide.aliprandi@st.com 2:9f389fd8fb2e 23 *
davide.aliprandi@st.com 2:9f389fd8fb2e 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
davide.aliprandi@st.com 2:9f389fd8fb2e 25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
davide.aliprandi@st.com 2:9f389fd8fb2e 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
davide.aliprandi@st.com 2:9f389fd8fb2e 27 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
davide.aliprandi@st.com 2:9f389fd8fb2e 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
davide.aliprandi@st.com 2:9f389fd8fb2e 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
davide.aliprandi@st.com 2:9f389fd8fb2e 30 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
davide.aliprandi@st.com 2:9f389fd8fb2e 31 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
davide.aliprandi@st.com 2:9f389fd8fb2e 32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
davide.aliprandi@st.com 2:9f389fd8fb2e 33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
davide.aliprandi@st.com 2:9f389fd8fb2e 34 *
davide.aliprandi@st.com 2:9f389fd8fb2e 35 ******************************************************************************
davide.aliprandi@st.com 2:9f389fd8fb2e 36 */
davide.aliprandi@st.com 2:9f389fd8fb2e 37
davide.aliprandi@st.com 2:9f389fd8fb2e 38
davide.aliprandi@st.com 2:9f389fd8fb2e 39 /* Includes ------------------------------------------------------------------*/
davide.aliprandi@st.com 2:9f389fd8fb2e 40
davide.aliprandi@st.com 2:9f389fd8fb2e 41 /* ACTION 1 ------------------------------------------------------------------*
davide.aliprandi@st.com 2:9f389fd8fb2e 42 * Include here platform specific header files. *
davide.aliprandi@st.com 2:9f389fd8fb2e 43 *----------------------------------------------------------------------------*/
davide.aliprandi@st.com 2:9f389fd8fb2e 44 #include "mbed.h"
davide.aliprandi@st.com 2:9f389fd8fb2e 45 /* ACTION 2 ------------------------------------------------------------------*
davide.aliprandi@st.com 2:9f389fd8fb2e 46 * Include here expansion board specific header files. *
davide.aliprandi@st.com 2:9f389fd8fb2e 47 *----------------------------------------------------------------------------*/
davide.aliprandi@st.com 2:9f389fd8fb2e 48 #include "XNucleoCCA02M1.h"
davide.aliprandi@st.com 2:9f389fd8fb2e 49
davide.aliprandi@st.com 2:9f389fd8fb2e 50
davide.aliprandi@st.com 2:9f389fd8fb2e 51 /* Variables -----------------------------------------------------------------*/
davide.aliprandi@st.com 2:9f389fd8fb2e 52
davide.aliprandi@st.com 2:9f389fd8fb2e 53 /* Indexes of the PCM buffer. */
davide.aliprandi@st.com 2:9f389fd8fb2e 54 uint32_t XNucleoCCA02M1::_PCM_buffer_read_index = 0;
davide.aliprandi@st.com 2:9f389fd8fb2e 55 uint32_t XNucleoCCA02M1::_PCM_buffer_write_index = 0;
davide.aliprandi@st.com 2:9f389fd8fb2e 56
davide.aliprandi@st.com 2:9f389fd8fb2e 57 /* Number of expansion boards. */
davide.aliprandi@st.com 2:9f389fd8fb2e 58 uint8_t XNucleoCCA02M1::_number_of_boards = 0;
davide.aliprandi@st.com 2:9f389fd8fb2e 59
davide.aliprandi@st.com 2:9f389fd8fb2e 60 /* Accessing shared areas: the PCM buffer. */
davide.aliprandi@st.com 2:9f389fd8fb2e 61 SingletonPtr<PlatformMutex> XNucleoCCA02M1::_mutex;
davide.aliprandi@st.com 2:9f389fd8fb2e 62
davide.aliprandi@st.com 2:9f389fd8fb2e 63
davide.aliprandi@st.com 2:9f389fd8fb2e 64 /* Methods -------------------------------------------------------------------*/
davide.aliprandi@st.com 2:9f389fd8fb2e 65
davide.aliprandi@st.com 2:9f389fd8fb2e 66 /**
davide.aliprandi@st.com 2:9f389fd8fb2e 67 * @brief Initializing the X_NUCLEO_CCA02M1 board.
davide.aliprandi@st.com 2:9f389fd8fb2e 68 * @param init Pointer to device specific initalization structure.
davide.aliprandi@st.com 2:9f389fd8fb2e 69 * @retval "0" in case of success, an error code otherwise.
davide.aliprandi@st.com 2:9f389fd8fb2e 70 */
davide.aliprandi@st.com 2:9f389fd8fb2e 71 status_t XNucleoCCA02M1::init(void *init)
davide.aliprandi@st.com 2:9f389fd8fb2e 72 {
davide.aliprandi@st.com 2:9f389fd8fb2e 73 /* Storing data. */
davide.aliprandi@st.com 2:9f389fd8fb2e 74 if (init != NULL)
davide.aliprandi@st.com 2:9f389fd8fb2e 75 {
davide.aliprandi@st.com 9:4c3d94b67a6b 76 _frequency = (*((XNucleoCCA02M1_init_t *) init)).frequency;
davide.aliprandi@st.com 9:4c3d94b67a6b 77 _channels = (*((XNucleoCCA02M1_init_t *) init)).channels;
davide.aliprandi@st.com 2:9f389fd8fb2e 78 }
davide.aliprandi@st.com 2:9f389fd8fb2e 79
davide.aliprandi@st.com 9:4c3d94b67a6b 80 #ifdef USE_OPEN_PDM2PCM_LIBRARY
davide.aliprandi@st.com 9:4c3d94b67a6b 81 /* Checking input parameters. */
Davidroid 20:9952bef19da1 82 if (!(((_frequency == 8000) && (_channels == 1)) ||
Davidroid 20:9952bef19da1 83 ((_frequency == 8000) && (_channels == 2)) ||
Davidroid 20:9952bef19da1 84 ((_frequency == 16000) && (_channels == 1)) ||
davide.aliprandi@st.com 11:b2f7f79026e4 85 ((_frequency == 16000) && (_channels == 2)) ||
davide.aliprandi@st.com 15:17bdadc6aa9c 86 ((_frequency == 32000) && (_channels == 1)) ||
Davidroid 19:1a061e306cc9 87 ((_frequency == 32000) && (_channels == 2)) ||
Davidroid 19:1a061e306cc9 88 ((_frequency == 44100) && (_channels == 1)) ||
Davidroid 19:1a061e306cc9 89 ((_frequency == 44100) && (_channels == 2)) ||
Davidroid 19:1a061e306cc9 90 ((_frequency == 48000) && (_channels == 1)) ||
Davidroid 19:1a061e306cc9 91 ((_frequency == 48000) && (_channels == 2))))
Davidroid 20:9952bef19da1 92 error("\r\nError: please set one of the following configurations: mono/stereo @ 8/16/32/44.1/48 KHz.\r\n");
davide.aliprandi@st.com 9:4c3d94b67a6b 93 #endif
davide.aliprandi@st.com 9:4c3d94b67a6b 94
Davidroid 14:377677cca2e9 95 /*
Davidroid 14:377677cca2e9 96 * Starting the I2S frequency divider.
Davidroid 14:377677cca2e9 97 * Note: put a jumper to connect PB_5 and PB_13 on the MORPHO connector when
Davidroid 14:377677cca2e9 98 * running a mono configuration.
Davidroid 14:377677cca2e9 99 */
Davidroid 14:377677cca2e9 100 if (_channels >= 2)
Davidroid 14:377677cca2e9 101 {
Davidroid 14:377677cca2e9 102 FrequencyDivider *divider = new FrequencyDivider();
Davidroid 14:377677cca2e9 103 divider->start();
Davidroid 14:377677cca2e9 104 }
davide.aliprandi@st.com 2:9f389fd8fb2e 105
davide.aliprandi@st.com 2:9f389fd8fb2e 106 /* Initializing the PDM to PCM conversion library. */
davide.aliprandi@st.com 2:9f389fd8fb2e 107 if ((_pdm2pcm = new PDM2PCMAudio(_frequency, _channels)) == NULL)
davide.aliprandi@st.com 2:9f389fd8fb2e 108 return COMPONENT_ERROR;
davide.aliprandi@st.com 2:9f389fd8fb2e 109
davide.aliprandi@st.com 2:9f389fd8fb2e 110 /* Setting I2S parameters. */
davide.aliprandi@st.com 2:9f389fd8fb2e 111 dev_i2s.mode(MASTER_RX, true);
davide.aliprandi@st.com 2:9f389fd8fb2e 112 dev_i2s.audio_frequency(_frequency == I2S_AUDIOFREQ_8K ? 4 * _frequency : 2 * _frequency);
davide.aliprandi@st.com 2:9f389fd8fb2e 113 dev_i2s.protocol(MSB);
davide.aliprandi@st.com 2:9f389fd8fb2e 114 dev_i2s.format(_channels == 1 ? 16 : 32, _channels == 1 ? 16 : 32, 1);
davide.aliprandi@st.com 2:9f389fd8fb2e 115
Davidroid 20:9952bef19da1 116 /* Buffer sizes in 16-bits samples. */
Davidroid 20:9952bef19da1 117 _PCM_samples_one_ms = ((_frequency * _channels) / 1000);
Davidroid 20:9952bef19da1 118 _PDM_samples_one_ms = _pdm2pcm->pcm2pdm_samples(_PCM_samples_one_ms);
Davidroid 20:9952bef19da1 119 _PDM_samples_two_ms = (_PDM_samples_one_ms << 1);
Davidroid 20:9952bef19da1 120
Davidroid 20:9952bef19da1 121 /* Allocating input and output buffers. */
Davidroid 20:9952bef19da1 122 _PDM_buffer_two_ms = (uint16_t *) calloc(_PDM_samples_two_ms, sizeof(uint16_t));
Davidroid 20:9952bef19da1 123 _PCM_buffer_n_ms = (int16_t *) calloc(_PCM_samples_one_ms * PCM_BUFFER_SIZE_ms, sizeof(uint16_t));
Davidroid 20:9952bef19da1 124
Davidroid 20:9952bef19da1 125 /* Allocating support buffers. */
Davidroid 20:9952bef19da1 126 _PDM_buffer_one_ms = (uint16_t *) calloc(_PDM_samples_one_ms, sizeof(uint16_t));
Davidroid 20:9952bef19da1 127
davide.aliprandi@st.com 2:9f389fd8fb2e 128 return COMPONENT_OK;
davide.aliprandi@st.com 2:9f389fd8fb2e 129 }
davide.aliprandi@st.com 2:9f389fd8fb2e 130
davide.aliprandi@st.com 2:9f389fd8fb2e 131 /**
davide.aliprandi@st.com 2:9f389fd8fb2e 132 * @brief Enabling transmission via USB.
davide.aliprandi@st.com 2:9f389fd8fb2e 133 * @param None.
davide.aliprandi@st.com 2:9f389fd8fb2e 134 * @retval "0" in case of success, an error code otherwise.
davide.aliprandi@st.com 2:9f389fd8fb2e 135 */
davide.aliprandi@st.com 2:9f389fd8fb2e 136 status_t XNucleoCCA02M1::enable_usb(void)
davide.aliprandi@st.com 2:9f389fd8fb2e 137 {
davide.aliprandi@st.com 2:9f389fd8fb2e 138 /* Initializing the USBAudio object. */
davide.aliprandi@st.com 2:9f389fd8fb2e 139 if ((_usb_audio = new USBAudio(32000, 2, _frequency, _channels)) == NULL)
davide.aliprandi@st.com 2:9f389fd8fb2e 140 return COMPONENT_ERROR;
davide.aliprandi@st.com 2:9f389fd8fb2e 141
davide.aliprandi@st.com 2:9f389fd8fb2e 142 /* Allocating support buffers. */
davide.aliprandi@st.com 2:9f389fd8fb2e 143 _USB_PCM_buffer_one_ms = (int16_t *) calloc(_PCM_samples_one_ms + _channels, sizeof(uint16_t));
davide.aliprandi@st.com 2:9f389fd8fb2e 144
davide.aliprandi@st.com 2:9f389fd8fb2e 145 _usb_enabled = true;
davide.aliprandi@st.com 2:9f389fd8fb2e 146
davide.aliprandi@st.com 2:9f389fd8fb2e 147 return COMPONENT_OK;
davide.aliprandi@st.com 2:9f389fd8fb2e 148 }
davide.aliprandi@st.com 2:9f389fd8fb2e 149
davide.aliprandi@st.com 2:9f389fd8fb2e 150 /**
davide.aliprandi@st.com 2:9f389fd8fb2e 151 * @brief Disabling transmission via USB.
davide.aliprandi@st.com 2:9f389fd8fb2e 152 * @param None.
davide.aliprandi@st.com 2:9f389fd8fb2e 153 * @retval "0" in case of success, an error code otherwise.
davide.aliprandi@st.com 2:9f389fd8fb2e 154 */
davide.aliprandi@st.com 2:9f389fd8fb2e 155 status_t XNucleoCCA02M1::disable_usb(void)
davide.aliprandi@st.com 2:9f389fd8fb2e 156 {
davide.aliprandi@st.com 2:9f389fd8fb2e 157 /* Freeing memory for the USBAudio object and support buffers. */
davide.aliprandi@st.com 2:9f389fd8fb2e 158 delete _usb_audio;
davide.aliprandi@st.com 2:9f389fd8fb2e 159 free(_USB_PCM_buffer_one_ms);
davide.aliprandi@st.com 2:9f389fd8fb2e 160
davide.aliprandi@st.com 2:9f389fd8fb2e 161 _usb_enabled = false;
davide.aliprandi@st.com 2:9f389fd8fb2e 162
davide.aliprandi@st.com 2:9f389fd8fb2e 163 return COMPONENT_OK;
davide.aliprandi@st.com 2:9f389fd8fb2e 164 }
davide.aliprandi@st.com 2:9f389fd8fb2e 165
davide.aliprandi@st.com 2:9f389fd8fb2e 166 /*
davide.aliprandi@st.com 2:9f389fd8fb2e 167 * @brief Start recording audio.
davide.aliprandi@st.com 2:9f389fd8fb2e 168 * @param None.
davide.aliprandi@st.com 2:9f389fd8fb2e 169 * @retval "0" in case of success, an error code otherwise.
davide.aliprandi@st.com 2:9f389fd8fb2e 170 */
davide.aliprandi@st.com 2:9f389fd8fb2e 171 status_t XNucleoCCA02M1::record(void)
davide.aliprandi@st.com 2:9f389fd8fb2e 172 {
davide.aliprandi@st.com 2:9f389fd8fb2e 173 /* Reading microphones via I2S. */
davide.aliprandi@st.com 2:9f389fd8fb2e 174 int res = dev_i2s.transfer(
davide.aliprandi@st.com 2:9f389fd8fb2e 175 (void *) NULL, 0,
davide.aliprandi@st.com 2:9f389fd8fb2e 176 (void *) _PDM_buffer_two_ms, _PDM_samples_two_ms * BYTES_PER_SAMPLE,
davide.aliprandi@st.com 2:9f389fd8fb2e 177 event_callback_t(this, &XNucleoCCA02M1::i2s_callback),
davide.aliprandi@st.com 2:9f389fd8fb2e 178 I2S_EVENT_ALL
davide.aliprandi@st.com 2:9f389fd8fb2e 179 );
davide.aliprandi@st.com 2:9f389fd8fb2e 180 if (res != 0)
davide.aliprandi@st.com 2:9f389fd8fb2e 181 return COMPONENT_ERROR;
davide.aliprandi@st.com 2:9f389fd8fb2e 182
davide.aliprandi@st.com 2:9f389fd8fb2e 183 /* Attaching a callback to send data through the USB at a standard frequency
davide.aliprandi@st.com 2:9f389fd8fb2e 184 of 1KHz. */
davide.aliprandi@st.com 2:9f389fd8fb2e 185 if (_usb_enabled)
davide.aliprandi@st.com 2:9f389fd8fb2e 186 _usb_audio->attachTx(this, &XNucleoCCA02M1::usb_handler);
davide.aliprandi@st.com 2:9f389fd8fb2e 187
davide.aliprandi@st.com 2:9f389fd8fb2e 188 return COMPONENT_OK;
davide.aliprandi@st.com 2:9f389fd8fb2e 189 }
davide.aliprandi@st.com 2:9f389fd8fb2e 190
davide.aliprandi@st.com 2:9f389fd8fb2e 191 /**
davide.aliprandi@st.com 2:9f389fd8fb2e 192 * @brief Attach a user-defined callback that will be executed whenever PCM
davide.aliprandi@st.com 2:9f389fd8fb2e 193 * data are ready, i.e. once each millisecond.
davide.aliprandi@st.com 2:9f389fd8fb2e 194 * The provided PCM buffer will be filled by the microphones.
davide.aliprandi@st.com 2:9f389fd8fb2e 195 * @param fptr Callback to attach.
davide.aliprandi@st.com 2:9f389fd8fb2e 196 * @retval None.
davide.aliprandi@st.com 2:9f389fd8fb2e 197 */
davide.aliprandi@st.com 2:9f389fd8fb2e 198 void XNucleoCCA02M1::attach(void (*fptr) (int16_t *PCM_buffer, uint16_t PCM_buffer_bytes))
davide.aliprandi@st.com 2:9f389fd8fb2e 199 {
davide.aliprandi@st.com 2:9f389fd8fb2e 200 /* Allocating support buffers. */
davide.aliprandi@st.com 2:9f389fd8fb2e 201 if ((_USER_PCM_buffer_one_ms = (int16_t *) calloc(_PCM_samples_one_ms, sizeof(uint16_t))) == NULL)
davide.aliprandi@st.com 2:9f389fd8fb2e 202 error("Instantiation of support buffers failed.\r\n");
davide.aliprandi@st.com 2:9f389fd8fb2e 203
davide.aliprandi@st.com 2:9f389fd8fb2e 204 /* Attaching the callback. */
davide.aliprandi@st.com 2:9f389fd8fb2e 205 _callback.attach(fptr);
davide.aliprandi@st.com 2:9f389fd8fb2e 206 _callback_attached = true;
davide.aliprandi@st.com 2:9f389fd8fb2e 207 }
davide.aliprandi@st.com 2:9f389fd8fb2e 208
davide.aliprandi@st.com 2:9f389fd8fb2e 209 /**
davide.aliprandi@st.com 2:9f389fd8fb2e 210 * @brief Attach a user-defined non-static callback that will be executed
davide.aliprandi@st.com 2:9f389fd8fb2e 211 * whenever PCM data are ready, i.e. once each millisecond.
davide.aliprandi@st.com 2:9f389fd8fb2e 212 * The provided PCM buffer will be filled by the microphones.
davide.aliprandi@st.com 2:9f389fd8fb2e 213 * @param tptr Pointer to an object.
davide.aliprandi@st.com 2:9f389fd8fb2e 214 * @param mptr Pointer to an object's callback.
davide.aliprandi@st.com 2:9f389fd8fb2e 215 * @retval None.
davide.aliprandi@st.com 2:9f389fd8fb2e 216 */
davide.aliprandi@st.com 2:9f389fd8fb2e 217 template<typename T>
davide.aliprandi@st.com 2:9f389fd8fb2e 218 void XNucleoCCA02M1::attach(T *tptr, void (T::*mptr) (int16_t *PCM_buffer, uint16_t PCM_buffer_bytes))
davide.aliprandi@st.com 2:9f389fd8fb2e 219 {
davide.aliprandi@st.com 2:9f389fd8fb2e 220 /* Allocating support buffers. */
davide.aliprandi@st.com 2:9f389fd8fb2e 221 if ((_USER_PCM_buffer_one_ms = (int16_t *) calloc(_PCM_samples_one_ms, sizeof(uint16_t))) == NULL)
davide.aliprandi@st.com 2:9f389fd8fb2e 222 error("Instantiation of support buffers failed.\r\n");
davide.aliprandi@st.com 2:9f389fd8fb2e 223
davide.aliprandi@st.com 2:9f389fd8fb2e 224 /* Attaching the callback. */
davide.aliprandi@st.com 2:9f389fd8fb2e 225 _callback.attach(tptr, mptr);
davide.aliprandi@st.com 2:9f389fd8fb2e 226 _callback_attached = true;
davide.aliprandi@st.com 2:9f389fd8fb2e 227 }
davide.aliprandi@st.com 2:9f389fd8fb2e 228
davide.aliprandi@st.com 2:9f389fd8fb2e 229 /**
davide.aliprandi@st.com 2:9f389fd8fb2e 230 * @brief I2S callback which is executed whenever PCM data are ready, i.e. once
davide.aliprandi@st.com 2:9f389fd8fb2e 231 * each millisecond.
davide.aliprandi@st.com 2:9f389fd8fb2e 232 * @param narg Narg flag.
davide.aliprandi@st.com 2:9f389fd8fb2e 233 * @retval None.
davide.aliprandi@st.com 2:9f389fd8fb2e 234 */
davide.aliprandi@st.com 2:9f389fd8fb2e 235 void XNucleoCCA02M1::i2s_callback(int narg)
davide.aliprandi@st.com 2:9f389fd8fb2e 236 {
davide.aliprandi@st.com 2:9f389fd8fb2e 237 /* Checking for errors. */
davide.aliprandi@st.com 2:9f389fd8fb2e 238 if (!(narg & (I2S_EVENT_RX_COMPLETE | I2S_EVENT_RX_HALF_COMPLETE)))
davide.aliprandi@st.com 2:9f389fd8fb2e 239 error("Unexpected transmission event.\r\n");
davide.aliprandi@st.com 2:9f389fd8fb2e 240
davide.aliprandi@st.com 2:9f389fd8fb2e 241 /* PDM to PCM Conversion. */
davide.aliprandi@st.com 2:9f389fd8fb2e 242 if (narg & (I2S_EVENT_RX_COMPLETE | I2S_EVENT_RX_HALF_COMPLETE))
davide.aliprandi@st.com 2:9f389fd8fb2e 243 {
davide.aliprandi@st.com 2:9f389fd8fb2e 244 #ifdef X_NUCLEO_CCA02M1_DEBUG
davide.aliprandi@st.com 2:9f389fd8fb2e 245 _i2s_signal = 1;
davide.aliprandi@st.com 2:9f389fd8fb2e 246 #endif
davide.aliprandi@st.com 2:9f389fd8fb2e 247
davide.aliprandi@st.com 2:9f389fd8fb2e 248 uint32_t PDM_index = (narg & I2S_EVENT_RX_HALF_COMPLETE ? 0 : _PDM_samples_one_ms);
davide.aliprandi@st.com 2:9f389fd8fb2e 249 switch (_channels)
davide.aliprandi@st.com 2:9f389fd8fb2e 250 {
davide.aliprandi@st.com 2:9f389fd8fb2e 251 case 1:
davide.aliprandi@st.com 2:9f389fd8fb2e 252 /* Scrambling PDM audio data. */
davide.aliprandi@st.com 2:9f389fd8fb2e 253 _pdm2pcm->scramble(_PDM_buffer_one_ms, &_PDM_buffer_two_ms[PDM_index], _PDM_samples_one_ms);
davide.aliprandi@st.com 2:9f389fd8fb2e 254 break;
davide.aliprandi@st.com 2:9f389fd8fb2e 255
davide.aliprandi@st.com 2:9f389fd8fb2e 256 case 2:
davide.aliprandi@st.com 2:9f389fd8fb2e 257 /* Demuxing PDM audio data. */
davide.aliprandi@st.com 2:9f389fd8fb2e 258 _pdm2pcm->demux(_PDM_buffer_one_ms, &_PDM_buffer_two_ms[PDM_index], _PDM_samples_one_ms);
davide.aliprandi@st.com 2:9f389fd8fb2e 259 break;
davide.aliprandi@st.com 2:9f389fd8fb2e 260 }
davide.aliprandi@st.com 2:9f389fd8fb2e 261
davide.aliprandi@st.com 2:9f389fd8fb2e 262 /* Acquiring resources. */
davide.aliprandi@st.com 2:9f389fd8fb2e 263 _mutex->lock();
davide.aliprandi@st.com 2:9f389fd8fb2e 264
davide.aliprandi@st.com 2:9f389fd8fb2e 265 /* Converting PDM to PCM audio data. */
Davidroid 20:9952bef19da1 266 _pdm2pcm->convert(&_PCM_buffer_n_ms[_PCM_buffer_write_index], _PDM_buffer_one_ms, _volume);
davide.aliprandi@st.com 2:9f389fd8fb2e 267
davide.aliprandi@st.com 2:9f389fd8fb2e 268 /* Copying PCM data to the user buffer. */
davide.aliprandi@st.com 2:9f389fd8fb2e 269 if (_callback_attached)
davide.aliprandi@st.com 2:9f389fd8fb2e 270 memcpy(_USER_PCM_buffer_one_ms, &_PCM_buffer_n_ms[_PCM_buffer_write_index], _PCM_samples_one_ms * BYTES_PER_SAMPLE);
davide.aliprandi@st.com 2:9f389fd8fb2e 271
davide.aliprandi@st.com 2:9f389fd8fb2e 272 /* Updating write index. */
davide.aliprandi@st.com 2:9f389fd8fb2e 273 _PCM_buffer_write_index += _PCM_samples_one_ms;
davide.aliprandi@st.com 2:9f389fd8fb2e 274 _PCM_buffer_write_index %= (PCM_BUFFER_SIZE_ms * _PCM_samples_one_ms);
davide.aliprandi@st.com 2:9f389fd8fb2e 275
davide.aliprandi@st.com 2:9f389fd8fb2e 276 /* Releasing resources. */
davide.aliprandi@st.com 2:9f389fd8fb2e 277 _mutex->unlock();
davide.aliprandi@st.com 2:9f389fd8fb2e 278
davide.aliprandi@st.com 2:9f389fd8fb2e 279 /* Executing user-defined callback. */
davide.aliprandi@st.com 2:9f389fd8fb2e 280 static bool first_time = true;
davide.aliprandi@st.com 2:9f389fd8fb2e 281 if (_callback_attached && first_time)
davide.aliprandi@st.com 2:9f389fd8fb2e 282 {
davide.aliprandi@st.com 2:9f389fd8fb2e 283 _callback.call(_USER_PCM_buffer_one_ms, _PCM_samples_one_ms * BYTES_PER_SAMPLE);
davide.aliprandi@st.com 2:9f389fd8fb2e 284 first_time = !first_time;
davide.aliprandi@st.com 2:9f389fd8fb2e 285 }
davide.aliprandi@st.com 2:9f389fd8fb2e 286
davide.aliprandi@st.com 2:9f389fd8fb2e 287 #ifdef X_NUCLEO_CCA02M1_DEBUG
davide.aliprandi@st.com 2:9f389fd8fb2e 288 _i2s_signal = 0;
davide.aliprandi@st.com 2:9f389fd8fb2e 289 #endif
davide.aliprandi@st.com 2:9f389fd8fb2e 290 }
davide.aliprandi@st.com 2:9f389fd8fb2e 291
davide.aliprandi@st.com 2:9f389fd8fb2e 292 /* Start sending data through the USB whenever the PCM buffer has been
davide.aliprandi@st.com 2:9f389fd8fb2e 293 filled up to the medium threshold. */
davide.aliprandi@st.com 2:9f389fd8fb2e 294 if (_usb_enabled)
davide.aliprandi@st.com 2:9f389fd8fb2e 295 {
davide.aliprandi@st.com 2:9f389fd8fb2e 296 static bool done = false;
davide.aliprandi@st.com 2:9f389fd8fb2e 297 static uint32_t calls = 0;
davide.aliprandi@st.com 2:9f389fd8fb2e 298 if (!done)
davide.aliprandi@st.com 2:9f389fd8fb2e 299 if (calls++ >= PCM_BUFFER_TH_MED_ms)
davide.aliprandi@st.com 2:9f389fd8fb2e 300 {
davide.aliprandi@st.com 2:9f389fd8fb2e 301 usb_handler();
davide.aliprandi@st.com 2:9f389fd8fb2e 302 done = true;
davide.aliprandi@st.com 2:9f389fd8fb2e 303 }
davide.aliprandi@st.com 2:9f389fd8fb2e 304 }
davide.aliprandi@st.com 2:9f389fd8fb2e 305 }
davide.aliprandi@st.com 2:9f389fd8fb2e 306
davide.aliprandi@st.com 2:9f389fd8fb2e 307 /**
davide.aliprandi@st.com 2:9f389fd8fb2e 308 * @brief Sending PCM data via USB.
davide.aliprandi@st.com 2:9f389fd8fb2e 309 * @param None.
davide.aliprandi@st.com 2:9f389fd8fb2e 310 * @retval None.
davide.aliprandi@st.com 2:9f389fd8fb2e 311 */
davide.aliprandi@st.com 2:9f389fd8fb2e 312 void XNucleoCCA02M1::usb_handler(void)
davide.aliprandi@st.com 2:9f389fd8fb2e 313 {
davide.aliprandi@st.com 2:9f389fd8fb2e 314 #ifdef X_NUCLEO_CCA02M1_DEBUG
davide.aliprandi@st.com 2:9f389fd8fb2e 315 _usb_signal = 1;
davide.aliprandi@st.com 2:9f389fd8fb2e 316 #endif
davide.aliprandi@st.com 2:9f389fd8fb2e 317
davide.aliprandi@st.com 2:9f389fd8fb2e 318 /* Acquiring resources. */
davide.aliprandi@st.com 2:9f389fd8fb2e 319 _mutex->lock();
davide.aliprandi@st.com 2:9f389fd8fb2e 320
davide.aliprandi@st.com 2:9f389fd8fb2e 321 /* Computing the delta-data to send through the USB depending on the
davide.aliprandi@st.com 2:9f389fd8fb2e 322 dis-alignment between the read and write index of the PCM buffer,
davide.aliprandi@st.com 2:9f389fd8fb2e 323 which may happen whenever the I2S and the USB do not works at the
davide.aliprandi@st.com 2:9f389fd8fb2e 324 same frequency (i.e. 1KHz). */
davide.aliprandi@st.com 2:9f389fd8fb2e 325 int32_t PCM_diff = _PCM_buffer_write_index - _PCM_buffer_read_index;
davide.aliprandi@st.com 2:9f389fd8fb2e 326 PCM_diff = (PCM_diff >= 0 ? PCM_diff : PCM_diff + PCM_BUFFER_SIZE_ms * _PCM_samples_one_ms);
davide.aliprandi@st.com 2:9f389fd8fb2e 327 int32_t PCM_buffer_high_index = PCM_BUFFER_TH_HIG_ms * _PCM_samples_one_ms;
davide.aliprandi@st.com 2:9f389fd8fb2e 328 int32_t PCM_buffer_low_index = PCM_BUFFER_TH_LOW_ms * _PCM_samples_one_ms;
davide.aliprandi@st.com 2:9f389fd8fb2e 329 USBAudio::AudioSampleCorrectType PCM_delta_samples = USBAudio::NoCorrection;
davide.aliprandi@st.com 2:9f389fd8fb2e 330
davide.aliprandi@st.com 2:9f389fd8fb2e 331 if (PCM_diff >= PCM_buffer_high_index) {
davide.aliprandi@st.com 2:9f389fd8fb2e 332 PCM_delta_samples = USBAudio::AddOneSample;
davide.aliprandi@st.com 2:9f389fd8fb2e 333 #ifdef X_NUCLEO_CCA02M1_DEBUG
davide.aliprandi@st.com 2:9f389fd8fb2e 334 _buffer_overrun = 1;
davide.aliprandi@st.com 2:9f389fd8fb2e 335 _buffer_underrun = 0;
davide.aliprandi@st.com 2:9f389fd8fb2e 336 #endif
davide.aliprandi@st.com 2:9f389fd8fb2e 337 }
davide.aliprandi@st.com 2:9f389fd8fb2e 338 else if (PCM_diff <= PCM_buffer_low_index) {
davide.aliprandi@st.com 2:9f389fd8fb2e 339 PCM_delta_samples = USBAudio::RemoveOneSample;
davide.aliprandi@st.com 2:9f389fd8fb2e 340 #ifdef X_NUCLEO_CCA02M1_DEBUG
davide.aliprandi@st.com 2:9f389fd8fb2e 341 _buffer_overrun = 0;
davide.aliprandi@st.com 2:9f389fd8fb2e 342 _buffer_underrun = 1;
davide.aliprandi@st.com 2:9f389fd8fb2e 343 } else {
davide.aliprandi@st.com 2:9f389fd8fb2e 344 _buffer_overrun = _buffer_underrun = 0;
davide.aliprandi@st.com 2:9f389fd8fb2e 345 #endif
davide.aliprandi@st.com 2:9f389fd8fb2e 346 }
davide.aliprandi@st.com 2:9f389fd8fb2e 347
davide.aliprandi@st.com 2:9f389fd8fb2e 348 /* Writing data through the USB. */
davide.aliprandi@st.com 2:9f389fd8fb2e 349 for (uint32_t i = 0, j = _PCM_buffer_read_index; i < _PCM_samples_one_ms + ((uint32_t) PCM_delta_samples) * _channels; j %= (PCM_BUFFER_SIZE_ms * _PCM_samples_one_ms))
davide.aliprandi@st.com 2:9f389fd8fb2e 350 _USB_PCM_buffer_one_ms[i++] = _PCM_buffer_n_ms[j++];
davide.aliprandi@st.com 2:9f389fd8fb2e 351 _usb_audio->writeSync((uint8_t *) _USB_PCM_buffer_one_ms, PCM_delta_samples);
davide.aliprandi@st.com 2:9f389fd8fb2e 352
davide.aliprandi@st.com 2:9f389fd8fb2e 353 /* Updating read index. */
davide.aliprandi@st.com 2:9f389fd8fb2e 354 _PCM_buffer_read_index += _PCM_samples_one_ms + ((uint32_t) PCM_delta_samples) * _channels;
davide.aliprandi@st.com 2:9f389fd8fb2e 355 _PCM_buffer_read_index %= (PCM_BUFFER_SIZE_ms * _PCM_samples_one_ms);
davide.aliprandi@st.com 2:9f389fd8fb2e 356
davide.aliprandi@st.com 2:9f389fd8fb2e 357 /* Releasing resources. */
davide.aliprandi@st.com 2:9f389fd8fb2e 358 _mutex->unlock();
davide.aliprandi@st.com 2:9f389fd8fb2e 359
davide.aliprandi@st.com 2:9f389fd8fb2e 360 #ifdef X_NUCLEO_CCA02M1_DEBUG
davide.aliprandi@st.com 2:9f389fd8fb2e 361 _usb_signal = 0;
davide.aliprandi@st.com 2:9f389fd8fb2e 362 #endif
davide.aliprandi@st.com 2:9f389fd8fb2e 363 }