Sound recorder firmware

Recorder firmware for Discovery F4 development kit. This firmware get samples from microphone and save them into SD Card memory. Recording parameters:

• Sample rate: 16 kHz
• Resolution: 16 bit
• Channels: stereo sound

The recording process starts when the blue button is pressed briefly. A blinking red LED indicates the recording process. The recording process stops when the blue button is pressed for 2 seconds.

Repo structure

.
├── docs                            # Project support documentation
├── projects                        # Project build solutions
│   ├── application_cube_ide        # Main application solution STM32CubeIDE
│   └── test                        # Additional test solutions
│       ├── cube_init               # Peripheral init example solution STM32CubeIDE
│       └── rec_storage             # rec_storage module test solution STM32CubeIDE
└── sources                         # Project source files
    ├── application                 # Applications source files
    ├── board                       # Boars support source files
    ├── components                  # Application support components source files
    ├── sdk                         # Vendor SDK files
    └── third_party                 # Third party sources

Firmware architecture

NOTE: rec_timer module not implemented yet!

SD Card connection

CMD     --> PD2
CLK     --> PC12
DAT0    --> PC8
DAT1    --> PC9
DAT2    --> PC10
DAT3    --> PC11