STM32CubeF4

@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file BSP/readme.txt
* @author MCD Application Team
* @brief Description of the BSP example.
******************************************************************************
* @attention
*
* Copyright (c) 2017 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.
*
******************************************************************************
@endverbatim

@par Example Description

This example provides a description of how to use the different BSP drivers.

At the beginning of the main program the HAL_Init() function is called to reset
all the peripherals.
Then the SystemClock_Config() function is used to configure the systemclock (SYSCLK)
to run at 168 MHz.

This example shows how to use the different functionalities of Accelerometer LIS302DL
or LIS3DSH depending on board Revision, Audio device CS43L22 and ST MEMS microphone
(MP45DT02) by switching between all tests using USER button.

Firstly, push the User button to start first Test.
4 LEDs will blink between each test.Press user key to start another test:

1) ACCELEROMETER_MEMS_Test. Device: "LIS302DL or LIS3DSH"
LEDs 3,4,5 and 6 show board orientation. (X and Y axis)

2) AudioPlay_Test(Need headphone). Device: "CS43L22"
Plug a headphone to ear a 48K sound /!\ Take care of yours ears.
Default volume is 50%.
Click feature has been implemented only for RevB board. A click on the board
will pause the audio file play (LED6 & LED4 ON). Another click resumes audio
file play (only LED6 on)
@Note: Copy file "/Utilities/Media/Audio/art_of_gard_448K.bin" directly
in the STM32 flash at @0x08080000

3) AudioRecord_Test. Device: "MP45DT02"
Record your voice (2 or 3 secs)
When LED6 turn on, Plug a headphone to ear a 16K sound /!\ Take care of yours ears.
Default volume is 70%.

@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.

@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
to have correct HAL operation.

@par Keywords

BSP, LCD, Touchscreen, PSRAM, DMA, QUADSPI, Erase, Read, Write, Audio play, Record, MEMS, Audio Codec, DFSDM,
I2S, Microphone, Headphones

@par Directory contents

- BSP/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
- BSP/Src/main.c Main program
- BSP/Src/mems.c Mems example and configuration file
- BSP/Src/audio_play.c Audio play file
- BSP/Src/audio_record.c Audio record file
- BSP/Src/stm32f4xx_it.c Interrupt handlers
- BSP/Inc/main.h Main program header file
- BSP/Inc/mems.h Mems example and configuration header file
- BSP/Inc/audio_play.h Audio play header file
- BSP/Inc/audio_record.h Audio record header file
- BSP/Inc/stm32f4xx_hal_conf.h Library Configuration file
- BSP/Inc/stm32f4xx_it.h Interrupt handlers header file

@par Hardware and Software environment

- This example runs on and STM32F407xx devices.

- This example has been tested with STMicroelectronics STM32F4-Discovery RevB & RevC
board and can be easily tailored to any other supported device and development board.

- Use STLink utility, available on www.st.com or any other in system programming
tool to load "/Utilities/Media/Audio/art_of_gard_448K.bin" file to the STM32
internal flash at the address 0x08080000.

@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 example