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/divisor.c@0:d5552d432108, 2017-02-28 (annotated)

Committer:
davide.aliprandi@st.com
Date:
Tue Feb 28 11:20:53 2017 +0100
Revision:
0:d5552d432108
Library to handle the X-NUCLEO-CCA02M1 MEMS Microphones Expansion Board.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
davide.aliprandi@st.com 0:d5552d432108 1 /**
davide.aliprandi@st.com 0:d5552d432108 2 ******************************************************************************
davide.aliprandi@st.com 0:d5552d432108 3 * @file divisor.c
davide.aliprandi@st.com 0:d5552d432108 4 * @author AST / Software Platforms and Cloud
davide.aliprandi@st.com 0:d5552d432108 5 * @version V1.0
davide.aliprandi@st.com 0:d5552d432108 6 * @date November 8th, 2016
davide.aliprandi@st.com 0:d5552d432108 7 * @brief Utilities header file for the X_NUCLEO_CCA02M1 expansion board.
davide.aliprandi@st.com 0:d5552d432108 8 ******************************************************************************
davide.aliprandi@st.com 0:d5552d432108 9 * @attention
davide.aliprandi@st.com 0:d5552d432108 10 *
davide.aliprandi@st.com 0:d5552d432108 11 * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
davide.aliprandi@st.com 0:d5552d432108 12 *
davide.aliprandi@st.com 0:d5552d432108 13 * Redistribution and use in source and binary forms, with or without modification,
davide.aliprandi@st.com 0:d5552d432108 14 * are permitted provided that the following conditions are met:
davide.aliprandi@st.com 0:d5552d432108 15 * 1. Redistributions of source code must retain the above copyright notice,
davide.aliprandi@st.com 0:d5552d432108 16 * this list of conditions and the following disclaimer.
davide.aliprandi@st.com 0:d5552d432108 17 * 2. Redistributions in binary form must reproduce the above copyright notice,
davide.aliprandi@st.com 0:d5552d432108 18 * this list of conditions and the following disclaimer in the documentation
davide.aliprandi@st.com 0:d5552d432108 19 * and/or other materials provided with the distribution.
davide.aliprandi@st.com 0:d5552d432108 20 * 3. Neither the name of STMicroelectronics nor the names of its contributors
davide.aliprandi@st.com 0:d5552d432108 21 * may be used to endorse or promote products derived from this software
davide.aliprandi@st.com 0:d5552d432108 22 * without specific prior written permission.
davide.aliprandi@st.com 0:d5552d432108 23 *
davide.aliprandi@st.com 0:d5552d432108 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
davide.aliprandi@st.com 0:d5552d432108 25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
davide.aliprandi@st.com 0:d5552d432108 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
davide.aliprandi@st.com 0:d5552d432108 27 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
davide.aliprandi@st.com 0:d5552d432108 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
davide.aliprandi@st.com 0:d5552d432108 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
davide.aliprandi@st.com 0:d5552d432108 30 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
davide.aliprandi@st.com 0:d5552d432108 31 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
davide.aliprandi@st.com 0:d5552d432108 32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
davide.aliprandi@st.com 0:d5552d432108 33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
davide.aliprandi@st.com 0:d5552d432108 34 *
davide.aliprandi@st.com 0:d5552d432108 35 ******************************************************************************
davide.aliprandi@st.com 0:d5552d432108 36 */
davide.aliprandi@st.com 0:d5552d432108 37
davide.aliprandi@st.com 0:d5552d432108 38
davide.aliprandi@st.com 0:d5552d432108 39 /* Includes ------------------------------------------------------------------*/
davide.aliprandi@st.com 0:d5552d432108 40
davide.aliprandi@st.com 0:d5552d432108 41 #include "cmsis.h"
davide.aliprandi@st.com 0:d5552d432108 42 #include "divisor.h"
davide.aliprandi@st.com 0:d5552d432108 43 #include "component.h"
davide.aliprandi@st.com 0:d5552d432108 44
davide.aliprandi@st.com 0:d5552d432108 45
davide.aliprandi@st.com 0:d5552d432108 46 /* Variables -----------------------------------------------------------------*/
davide.aliprandi@st.com 0:d5552d432108 47
davide.aliprandi@st.com 0:d5552d432108 48 static TIM_HandleTypeDef TimDividerHandle;
davide.aliprandi@st.com 0:d5552d432108 49 static TIM_SlaveConfigTypeDef sSlaveConfig;
davide.aliprandi@st.com 0:d5552d432108 50 static TIM_IC_InitTypeDef sICConfig;
davide.aliprandi@st.com 0:d5552d432108 51 static TIM_OC_InitTypeDef sOCConfig;
davide.aliprandi@st.com 0:d5552d432108 52
davide.aliprandi@st.com 0:d5552d432108 53
davide.aliprandi@st.com 0:d5552d432108 54 /* Functions -----------------------------------------------------------------*/
davide.aliprandi@st.com 0:d5552d432108 55
davide.aliprandi@st.com 0:d5552d432108 56 /**
davide.aliprandi@st.com 0:d5552d432108 57 * @brief Initializing audio timer.
davide.aliprandi@st.com 0:d5552d432108 58 * @param None.
davide.aliprandi@st.com 0:d5552d432108 59 * @retval COMPONENT_OK in case of success, COMPONENT_ERROR otherwise.
davide.aliprandi@st.com 0:d5552d432108 60 */
davide.aliprandi@st.com 0:d5552d432108 61 Status_t AUDIO_IN_Timer_Init(void)
davide.aliprandi@st.com 0:d5552d432108 62 {
davide.aliprandi@st.com 0:d5552d432108 63 GPIO_InitTypeDef GPIO_InitStruct;
davide.aliprandi@st.com 0:d5552d432108 64
davide.aliprandi@st.com 0:d5552d432108 65 /* Enable AUDIO_TIMER clock*/
davide.aliprandi@st.com 0:d5552d432108 66 AUDIO_IN_TIMER_CLK_ENABLE();
davide.aliprandi@st.com 0:d5552d432108 67 AUDIO_IN_TIMER_CHOUT_GPIO_PORT_CLK_ENABLE();
davide.aliprandi@st.com 0:d5552d432108 68 AUDIO_IN_TIMER_CHIN_GPIO_PORT_CLK_ENABLE();
davide.aliprandi@st.com 0:d5552d432108 69
davide.aliprandi@st.com 0:d5552d432108 70 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
davide.aliprandi@st.com 0:d5552d432108 71 GPIO_InitStruct.Pull = GPIO_PULLUP;
davide.aliprandi@st.com 0:d5552d432108 72 GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
davide.aliprandi@st.com 0:d5552d432108 73
davide.aliprandi@st.com 0:d5552d432108 74 GPIO_InitStruct.Alternate = AUDIO_IN_TIMER_CHIN_AF;
davide.aliprandi@st.com 0:d5552d432108 75 GPIO_InitStruct.Pin = AUDIO_IN_TIMER_CHIN_PIN;
davide.aliprandi@st.com 0:d5552d432108 76 HAL_GPIO_Init(AUDIO_IN_TIMER_CHIN_GPIO_PORT, &GPIO_InitStruct);
davide.aliprandi@st.com 0:d5552d432108 77
davide.aliprandi@st.com 0:d5552d432108 78 GPIO_InitStruct.Alternate = AUDIO_IN_TIMER_CHOUT_AF;
davide.aliprandi@st.com 0:d5552d432108 79 GPIO_InitStruct.Pin = AUDIO_IN_TIMER_CHOUT_PIN;
davide.aliprandi@st.com 0:d5552d432108 80 HAL_GPIO_Init(AUDIO_IN_TIMER_CHOUT_GPIO_PORT, &GPIO_InitStruct);
davide.aliprandi@st.com 0:d5552d432108 81
davide.aliprandi@st.com 0:d5552d432108 82 TimDividerHandle.Instance = AUDIO_IN_TIMER;
davide.aliprandi@st.com 0:d5552d432108 83
davide.aliprandi@st.com 0:d5552d432108 84 /* Configure the Input: channel_1 */
davide.aliprandi@st.com 0:d5552d432108 85 sICConfig.ICPolarity = TIM_ICPOLARITY_RISING;
davide.aliprandi@st.com 0:d5552d432108 86 sICConfig.ICSelection = TIM_ICSELECTION_DIRECTTI;
davide.aliprandi@st.com 0:d5552d432108 87 sICConfig.ICPrescaler = TIM_ICPSC_DIV1;
davide.aliprandi@st.com 0:d5552d432108 88 sICConfig.ICFilter = 0;
davide.aliprandi@st.com 0:d5552d432108 89 if (HAL_TIM_IC_ConfigChannel(&TimDividerHandle, &sICConfig, TIM_CHANNEL_1) != HAL_OK)
davide.aliprandi@st.com 0:d5552d432108 90 {
davide.aliprandi@st.com 0:d5552d432108 91 return COMPONENT_ERROR;
davide.aliprandi@st.com 0:d5552d432108 92 }
davide.aliprandi@st.com 0:d5552d432108 93
davide.aliprandi@st.com 0:d5552d432108 94 /* Configure TIM1 in Gated Slave mode for the external trigger (Filtered Timer
davide.aliprandi@st.com 0:d5552d432108 95 Input 1) */
davide.aliprandi@st.com 0:d5552d432108 96 sSlaveConfig.InputTrigger = TIM_TS_TI1FP1;
davide.aliprandi@st.com 0:d5552d432108 97 sSlaveConfig.SlaveMode = TIM_SLAVEMODE_EXTERNAL1;
davide.aliprandi@st.com 0:d5552d432108 98 if (HAL_TIM_SlaveConfigSynchronization(&TimDividerHandle, &sSlaveConfig) != HAL_OK)
davide.aliprandi@st.com 0:d5552d432108 99 {
davide.aliprandi@st.com 0:d5552d432108 100 return COMPONENT_ERROR;
davide.aliprandi@st.com 0:d5552d432108 101 }
davide.aliprandi@st.com 0:d5552d432108 102
davide.aliprandi@st.com 0:d5552d432108 103 /* Initialize TIM3 peripheral in PWM mode*/
davide.aliprandi@st.com 0:d5552d432108 104 TimDividerHandle.Init.Period = 1;
davide.aliprandi@st.com 0:d5552d432108 105 TimDividerHandle.Init.Prescaler = 0;
davide.aliprandi@st.com 0:d5552d432108 106 TimDividerHandle.Init.ClockDivision = 0;
davide.aliprandi@st.com 0:d5552d432108 107 TimDividerHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
davide.aliprandi@st.com 0:d5552d432108 108 TimDividerHandle.Init.RepetitionCounter = 0;
davide.aliprandi@st.com 0:d5552d432108 109 if (HAL_TIM_PWM_Init(&TimDividerHandle) != HAL_OK)
davide.aliprandi@st.com 0:d5552d432108 110 {
davide.aliprandi@st.com 0:d5552d432108 111 return COMPONENT_ERROR;
davide.aliprandi@st.com 0:d5552d432108 112 }
davide.aliprandi@st.com 0:d5552d432108 113
davide.aliprandi@st.com 0:d5552d432108 114 /* Configure the PWM_channel_1 */
davide.aliprandi@st.com 0:d5552d432108 115 sOCConfig.OCMode = TIM_OCMODE_PWM1;
davide.aliprandi@st.com 0:d5552d432108 116 sOCConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
davide.aliprandi@st.com 0:d5552d432108 117 sOCConfig.Pulse = 1;
davide.aliprandi@st.com 0:d5552d432108 118 if (HAL_TIM_PWM_ConfigChannel(&TimDividerHandle, &sOCConfig, TIM_CHANNEL_2) != HAL_OK)
davide.aliprandi@st.com 0:d5552d432108 119 {
davide.aliprandi@st.com 0:d5552d432108 120 return COMPONENT_ERROR;
davide.aliprandi@st.com 0:d5552d432108 121 }
davide.aliprandi@st.com 0:d5552d432108 122
davide.aliprandi@st.com 0:d5552d432108 123 return COMPONENT_OK;
davide.aliprandi@st.com 0:d5552d432108 124 }
davide.aliprandi@st.com 0:d5552d432108 125
davide.aliprandi@st.com 0:d5552d432108 126 /**
davide.aliprandi@st.com 0:d5552d432108 127 * @brief Audio Timer Start
davide.aliprandi@st.com 0:d5552d432108 128 * @param None
davide.aliprandi@st.com 0:d5552d432108 129 * @retval None
davide.aliprandi@st.com 0:d5552d432108 130 */
davide.aliprandi@st.com 0:d5552d432108 131 uint8_t AUDIO_IN_Timer_Start()
davide.aliprandi@st.com 0:d5552d432108 132 {
davide.aliprandi@st.com 0:d5552d432108 133 if (HAL_TIM_IC_Start(&TimDividerHandle, TIM_CHANNEL_1) != HAL_OK)
davide.aliprandi@st.com 0:d5552d432108 134 {
davide.aliprandi@st.com 0:d5552d432108 135 return COMPONENT_ERROR;
davide.aliprandi@st.com 0:d5552d432108 136 }
davide.aliprandi@st.com 0:d5552d432108 137 /* Start the Output Compare */
davide.aliprandi@st.com 0:d5552d432108 138 if (HAL_TIM_OC_Start(&TimDividerHandle, TIM_CHANNEL_2) != HAL_OK)
davide.aliprandi@st.com 0:d5552d432108 139 {
davide.aliprandi@st.com 0:d5552d432108 140 return COMPONENT_ERROR;
davide.aliprandi@st.com 0:d5552d432108 141 }
davide.aliprandi@st.com 0:d5552d432108 142
davide.aliprandi@st.com 0:d5552d432108 143 return COMPONENT_OK;
davide.aliprandi@st.com 0:d5552d432108 144 }