Audio Demo with DISCO Board, takes control samples, waits for user input, samples regularly.
Dependencies: CMSIS_DSP_401 STM32L4xx_HAL_Driver mbed-src_DISO_AUDIO_DEMO
Diff: audio_if.cpp
- Revision:
- 0:3eee9435dd17
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/audio_if.cpp Sun Dec 13 19:12:11 2015 +0000 @@ -0,0 +1,188 @@ +/** +****************************************************************************** +* @file /Src/audio_if.c +* @author Central Labs +* @version V1.0.0 +* @date 7-May-2015 +* @brief USB Device Audio interface file. +****************************************************************************** +@attention +* +* <h2><center>© COPYRIGHT(c) 2014 STMicroelectronics</center></h2> +* +* Licensed under MCD-ST Liberty SW License Agreement V2, (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.st.com/software_license_agreement_liberty_v2 +* +* Redistribution and use in source and binary forms, with or without modification, +* are permitted provided that the following conditions are met: +* 1. Redistributions of source code must retain the above copyright notice, +* this list of conditions and the following disclaimer. +* 2. Redistributions in binary form must reproduce the above copyright notice, +* this list of conditions and the following disclaimer in the documentation +* and/or other materials provided with the distribution. +* 3. Neither the name of STMicroelectronics nor the names of its contributors +* may be used to endorse or promote products derived from this software +* without specific prior written permission. +* +* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE +* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR +* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER +* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, +* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +* +****************************************************************************** +*/ + +/* Includes ------------------------------------------------------------------*/ +#include "audio_if.h" + +//uint16_t PDM_Buffer[AUDIO_CHANNELS*AUDIO_SAMPLING_FREQUENCY/1000*64/8]; +//static uint16_t PCM_Buffer[AUDIO_CHANNELS*AUDIO_SAMPLING_FREQUENCY/1000]; + +/* Private typedef -----------------------------------------------------------*/ +/* Private define ------------------------------------------------------------*/ +/* Private macro -------------------------------------------------------------*/ +/* Private function prototypes -----------------------------------------------*/ +/* Private variables ---------------------------------------------------------*/ + + +/* Private functions ---------------------------------------------------------*/ +/* This table maps the audio device class setting in 1/256 dB to a +* linear 0-64 scaling used in pdm_filter.c. It is computed as +* 256*20*log10(index/64). */ +//const int16_t vol_table[65] = +//{ 0x8000, 0xDBE0, 0xE1E6, 0xE56B, 0xE7EB, 0xE9DB, 0xEB70, 0xECC7, +//0xEDF0, 0xEEF6, 0xEFE0, 0xF0B4, 0xF176, 0xF228, 0xF2CD, 0xF366, +//0xF3F5, 0xF47C, 0xF4FB, 0xF574, 0xF5E6, 0xF652, 0xF6BA, 0xF71C, +//0xF778, 0xF7D6, 0xF82D, 0xF881, 0xF8D2, 0xF920, 0xF96B, 0xF9B4, +//0xF9FB, 0xFA3F, 0xFA82, 0xFAC2, 0xFB01, 0xFB3E, 0xFB79, 0xFBB3, +//0xFBEB, 0xFC22, 0xFC57, 0xFC8C, 0xFCBF, 0xFCF1, 0xFD22, 0xFD51, +//0xFD80, 0xFDAE, 0xFDDB, 0xFE07, 0xFE32, 0xFE5D, 0xFE86, 0xFEAF, +//0xFED7, 0xFF00, 0xFF25, 0xFF4B, 0xFF70, 0xFF95, 0xFFB9, 0xFFD0, +//0x0000 }; + +//volatile uint8_t VolumeSetting=64; + +/** +* @brief Initializes the AUDIO media low layer. +* @param AudioFreq: Audio frequency used to play the audio stream. +* @param BitRes: desired bit resolution +* @param ChnlNbr: number of channel to be configured +* @retval AUDIO_OK in case of success, AUDIO_ERROR otherwise +*/ +int8_t Audio_Init(void) +{ + return BSP_AUDIO_IN_Init(48000, 16, 1); +} + + + +/** +* @brief Start audio recording engine +* @retval AUDIO_OK in case of success, AUDIO_ERROR otherwise +*/ +int8_t Audio_Record(uint16_t * recbuff) +{ + int8_t res = BSP_AUDIO_IN_Record(recbuff, 2048); +// AudioProcess(pbuf, recbuff); + return res; +} + +/** +* @brief Controls AUDIO Volume. +* @param vol: Volume level +* @retval AUDIO_OK in case of success, AUDIO_ERROR otherwise +*/ +//int8_t Audio_VolumeCtl(int16_t Volume) +//{ +// /* Call low layer volume setting function */ +// int j; +// +// j = 0; +// /* Find the setting nearest to the desired setting */ +// while(j<64 && +// abs(Volume-vol_table[j]) > abs(Volume-vol_table[j+1])) { +// j++; +// } +// /* Now do the volume adjustment */ +// VolumeSetting = (uint8_t)j; +// return BSP_AUDIO_IN_SetVolume(VolumeSetting); +// +// +//} + +/** +* @brief Controls AUDIO Mute. +* @param cmd: Command opcode +* @retval AUDIO_OK in case of success, AUDIO_ERROR otherwise +*/ +//int8_t Audio_MuteCtl(uint8_t cmd) +//{ +// return AUDIO_OK; +//} + + +/** +* @brief Stops audio acquisition +* @param none +* @retval AUDIO_OK in case of success, AUDIO_ERROR otherwise +*/ +int8_t Audio_Stop(void) +{ + return BSP_AUDIO_IN_Stop(); + +} + +/** +* @brief Pauses audio acquisition +* @param none +* @retval AUDIO_OK in case of success, AUDIO_ERROR otherwise +*/ +// +//int8_t Audio_Pause(void) +//{ +// return 0; +//} + + +/** +* @brief Resumes audio acquisition +* @param none +* @retval AUDIO_OK in case of success, AUDIO_ERROR otherwise +*/ +//int8_t Audio_Resume(void) +//{ +// return AUDIO_OK; +//} + +/** +* @brief Manages command from usb +* @param None +* @retval AUDIO_OK in case of success, AUDIO_ERROR otherwise +*/ +// +//int8_t Audio_CommandMgr(uint8_t cmd) +//{ +// return AUDIO_OK; +//} +// +//void AudioProcess(uint16_t * pbuf, uint16_t * recbuff) +//{ +// BSP_AUDIO_IN_PDMToPCM(pbuf,recbuff); +// // need to copy recbuff to final output buff (in chunks) +//} + + + + + +/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ +