/**
@page Audio_playback_and_record Audio Playback and Record application
@verbatim
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* @file Audio/Audio_playback_and_record/readme.txt
* @author MCD Application Team
* @version V1.0.3
* @date 22-April-2016
* @brief Description of the Audio Playback and Record application
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*
* Copyright (c) 2016 STMicroelectronics International N.V. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted, provided that the following conditions are met:
*
* 1. Redistribution 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 other
* contributors to this software may be used to endorse or promote products
* derived from this software without specific written permission.
* 4. This software, including modifications and/or derivative works of this
* software, must execute solely and exclusively on microcontroller or
* microprocessor devices manufactured by or for STMicroelectronics.
* 5. Redistribution and use of this software other than as permitted under
* this license is void and will automatically terminate your rights under
* this license.
*
* THIS SOFTWARE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY
* RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT
* SHALL STMICROELECTRONICS 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.
*
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@endverbatim
@par Application Description
This application shows how to use the different functionalities of Audio device
and ST MEMS microphones (MP45DT02), use touch screen to enter into playback or record menu
1) Explorer Audio File menu.
This menu is used to display wave files stored in the USB Key. Touch the screen
anywhere, except play or record buttons, to explore the content of the USB key
2) Audio playback menu (Need headphone).
In playback menu, any wave file stored under the USB Key can be opened using the FatFs
file system and transferred to the internal SRAM using the file system. All the wave
files properties are read from the Wave File Header.
Plug a headphone to ear the sound /!\ Take care of yours ears. Default volume is 70%.
To play the audio file, a buffer is used between USB and audio codec. This buffer
is used like a ping-pong buffer to be able to read regularly data from USB to be
sent to audio codec:
- Using FatFs driver, a 1st read of AUDIO_BUFFER_SIZE bytes is done
- This buffer is sent to audio BSP which uses DMA mode to transfer data from MCU
to audio codec (16 bits)
- At DMA half transfer ISR, an indication is sent to application to indicate that
half of the buffer has been sent
- At DMA half transfer ISR exit, application can read (AUDIO_BUFFER_SIZE/2) bytes from USB to fill
the 1st part of the buffer
- At DMA transfer complete ISR, DMA transfer is requested to send 1st part of the
buffer
- At DMA transfer complete ISR exit, application can read (AUDIO_BUFFER_SIZE/2) bytes from USB to fill
the 2nd part of the buffer
- When file size is reached, audio codec is stopped and a new play is requested.
A touch screen interface is used to navigate from a file to another (Next and Previous buttons),
to change volume, pause playback and to quit playback menu by pressing Stop button.
Note: The audio files provided under "/Utilities/Media/Audio" are based on a free
music download from
Royalty Free Music Songs | DanoSongs.com website and user can load his own audio
(*.wav) files in the USB Key root.
3) Audio recorder menu:
Two MEMS microphone MP34DT01 mounted on STM32746G_DISCOVERY are connected
to the Inter-IC Sound (I2S) peripheral. The I2S is configured in master
receiver mode. In this mode, the I2S peripheral provides the clock to an embedded
timer (TIM3 in this application) which divides the I2S clock. This clock is delivered
to the MEMS microphone through CLK. Data acquired (Audio samples) from the MEMS
microphone through DOUT.
Data acquisition is performed in 16KHz and 16-bit PDM format and DMA is used to
transfer data from I2S peripheral to internal SRAM. In order to avoid data-loss, one buffer
split into two halves is used:
When the first half of the buffer is filled (half transfer complete), the PDM
samples are converted to PCM format while the second half of the buffer is being
used to receive data from Audio samples.
When the second half of the buffer is filled (transfer complete), the PDM
samples are converted to PCM format while the first half of the buffer is being
used to receive data from Audio samples. This process is repeated as long as the
application is running.
To avoid data corruption:
- DMA ISR priority must be set at a Lower priority than USB interrupt sources,
this priority order must be respected when managing other interrupts;
- The processing time of converting/filtering samples from PDM to PCM
PDM_Filter_64_LSB()) should be lower than the time required to fill a
single buffer.
In main loop of the application, when a buffer is full with PCM format it is written
in USB key using the free file system FatFS.
A touch screen interface is used to launch record process, to change input volume,
pause record and to quit record menu by pressing Stop button.
Note that a PDM Audio software decoding library provided in binary is used in
this application. For IAR EWARM toolchain, the library is labeled
"libPDMFilter_IAR.a".
@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
to have correct HAL operation.
@par Directory contents
- Audio_playback_and_record/Src/main.c Main program
- Audio_playback_and_record/Src/stm32f7xx_it.c Interrupt handlers
- Audio_playback_and_record/Src/system_stm32f7xx.c STM32F7xx system source file
- Audio_playback_and_record/Src/usbh_conf.c Board support package for the USB host library
- Audio_playback_and_record/Src/waveplayer.c Audio play file
- Audio_playback_and_record/Src/waverecorder.c Audio record file
- Audio_playback_and_record/Inc/ffconf.h FAT file system module configuration file
- Audio_playback_and_record/Inc/main.h Main program header file
- Audio_playback_and_record/Inc/stm32f7xx_hal_conf.h HAL configuration file
- Audio_playback_and_record/Inc/stm32f7xx_it.h Interrupt handlers header file
- Audio_playback_and_record/Inc/usbh_conf.h USB driver Configuration file
- Audio_playback_and_record/Inc/waveplayer.h Audio play header file
- Audio_playback_and_record/Inc/waverecorder.h Audio record header file
@par Hardware and Software environment
- This example runs on STM32F756xx/STM32F746xx devices.
- This application has been tested with STM32746G_DISCOVERY board and can be
easily tailored to any other supported device and development board.
- STM32746G_DISCOVERY Set-up
- Plug the USB key into the STM32746G_DISCOVERY board through 'USB micro A-Male
to A-Female' cable (FS mode: connector CN13).
- Connect a headphone to connector CN10.
@par How to use it ?
In order to make the program work, you must do the following:
- Open your preferred toolchain
- Rebuild all files and load your image into target memory
- Run the application
* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
*/
توجه: این یک موضوع قدیمی است که آخرین پست ارسالی آن مربوط به 2801 روز قبل است . لطفا فقط پاسخ ها ، سوالات و درخواست های 100 درصد مرتبط را به آن ارسال کنید و برای درخواست ها و سوالات جدید موضوع جدیدی را ایجاد کنید
ذخیره دیتا با فرمت WAV در SD با میکروی stm32f
مجوز های ارسال و ویرایش
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