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/**
******************************************************************************
* @file record.c
* @author MCD Application Team
* @brief Audio application.
******************************************************************************
* @attention
*
* Copyright (c) 2020-2021 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define AUDIO_OUT_MS (20)
#define AUDIO_OUT_SAMPLING_FREQUENCY 16000
/* Private macro -------------------------------------------------------------*/
/** @defgroup AUDIO_APPLICATION_Exported_Variables
* @{
*/
USBD_HandleTypeDef hUSBDDevice;
extern USBD_AUDIO_ItfTypeDef USBD_AUDIO_fops;
uint16_t PDM_Buffer[((((2 * AUDIO_IN_CHANNELS * AUDIO_IN_SAMPLING_FREQUENCY) / 1000) * MAX_DECIMATION_FACTOR) / 16)* N_MS_PER_INTERRUPT ];
uint16_t PCM_Buffer[((AUDIO_IN_SAMPLING_FREQUENCY)/1000) * N_MS_PER_INTERRUPT ];
BSP_AUDIO_Init_t MicParams;
/**
* @}
*/
/* Private variables ---------------------------------------------------------*/
/** @defgroup AUDIO_APPLICATION_Private_Variables
* @{
*/
/**
* @}
*/
/** @defgroup AUDIO_APPLICATION_Exported_Function
* @{
*/
static void Init_Acquisition_Peripherals(uint32_t AudioFreq, uint32_t ChnlNbrIn, uint32_t ChnlNbrOut);
static void Start_Acquisition(void);
static void AudioProcess(void);
/**
* @brief Audio Record Demo.
*/
void Audio_Record_Demo(void)
{
BSP_LCD_Clear(0,SSD1315_COLOR_BLACK);
BSP_LCD_Refresh(0);
UTIL_LCD_DisplayStringAt(0, 0, (uint8_t *)"Audio Record ", CENTER_MODE);
UTIL_LCD_DrawRect(0, 0, 127 , 11, SSD1315_COLOR_WHITE);
UTIL_LCD_DisplayStringAt(0, 15, (uint8_t *)"Open Voice Recorder", CENTER_MODE);
UTIL_LCD_DisplayStringAt(0, 27, (uint8_t *)"Application", CENTER_MODE);
UTIL_LCD_DisplayStringAt(0, 40, (uint8_t *)"Press user button1", CENTER_MODE);
UTIL_LCD_DisplayStringAt(0, 52, (uint8_t *)"to skip audio demo", CENTER_MODE);
BSP_LCD_Refresh(0);
/* Initialize USB descriptor basing on channels number and sampling frequency */
USBD_AUDIO_Init_Microphone_Descriptor(&hUSBDDevice, AUDIO_OUT_SAMPLING_FREQUENCY, AUDIO_CHANNELS_OUT);
/* Init Device Library */
USBD_Init(&hUSBDDevice, &AUDIO_Desc, 0);
/* Add Supported Class */
USBD_RegisterClass(&hUSBDDevice, &USBD_AUDIO);
/* Add Interface callbacks for AUDIO Class */
USBD_AUDIO_RegisterInterface(&hUSBDDevice, &USBD_AUDIO_fops);
/* Start Device Process */
USBD_Start(&hUSBDDevice);
/* Start audio acquisition and streaming */
#ifdef DISABLE_USB_DRIVEN_ACQUISITION
Init_Acquisition_Peripherals(AUDIO_IN_SAMPLING_FREQUENCY, AUDIO_IN_CHANNELS, 0);
Start_Acquisition();
#endif
while (1)
{
if(CheckForUserInput() > 0)
{
ButtonState = 0;
BSP_AUDIO_IN_Stop(BSP_AUDIO_INSTANCE);
USBD_DeInit(&hUSBDDevice);
BSP_AUDIO_IN_DeInit(BSP_AUDIO_INSTANCE);
return;
}
}
}
/**
* @brief Half Transfer user callback, called by BSP functions.
* @param None
* @retval None
*/
void BSP_AUDIO_IN_HalfTransfer_CallBack(uint32_t Instance)
{
AudioProcess();
}
/**
* @brief Transfer Complete user callback, called by BSP functions.
* @param None
* @retval None
*/
void BSP_AUDIO_IN_TransferComplete_CallBack(uint32_t Instance)
{
AudioProcess();
}
/**
* @brief User function that is called when 1 ms of PDM data is available.
* In this application only PDM to PCM conversion and USB streaming
* is performed.
* User can add his own code here to perform some DSP or audio analysis.
* @param none
* @retval None
*/
static void AudioProcess(void)
{
BSP_AUDIO_IN_PDMToPCM(BSP_AUDIO_INSTANCE, (uint16_t * )PDM_Buffer, (uint16_t*)PCM_Buffer);
Send_Audio_to_USB((int16_t *)PCM_Buffer, ((AUDIO_IN_SAMPLING_FREQUENCY/1000)*N_MS_PER_INTERRUPT));
}
/**
* @brief User function that is called when 1 ms of PDM data is available.
* In this application only PDM to PCM conversion and USB streaming
* is performed.
* User can add his own code here to perform some DSP or audio analysis.
* @param none
* @retval None
*/
static void Init_Acquisition_Peripherals(uint32_t AudioFreq, uint32_t ChnlNbrIn, uint32_t ChnlNbrOut)
{
MicParams.BitsPerSample = 16;
MicParams.ChannelsNbr = ChnlNbrIn;
MicParams.Device = AUDIO_IN_DIGITAL_MIC;
MicParams.SampleRate = AudioFreq;
MicParams.Volume = AUDIO_VOLUME_INPUT;
if (BSP_AUDIO_IN_Init(BSP_AUDIO_INSTANCE, &MicParams)!=BSP_ERROR_NONE)
{
Error_Handler();
}
}
/**
* @brief User function that is called when 1 ms of PDM data is available.
* In this application only PDM to PCM conversion and USB streaming
* is performed.
* User can add his own code here to perform some DSP or audio analysis.
* @param none
* @retval None
*/
static void Start_Acquisition(void)
{
if (BSP_AUDIO_IN_Record(BSP_AUDIO_INSTANCE, (uint8_t *) PDM_Buffer, AUDIO_IN_BUFFER_SIZE)!=BSP_ERROR_NONE)
{
Error_Handler();
}
}
/**
* @}
*/
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