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Simple test application for the STMicroelectronics X-NUCLEO-CCA02M1 MEMS Microphones Expansion Board, built against mbed classic.
Dependencies: X_NUCLEO_CCA02M1 mbed ST_Events-old
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Recording audio with the X-NUCLEO-CCA02M1 Expansion Board¶
This application provides a simple example of usage of the X-NUCLEO-CCA02M1 MEMS Microphones Expansion Board, built against mbed classic 2.x.
It shows how to record a 2-channel stereo signal as an array of PCM samples (16 bit/sample) that can be acquired through an audio SW like Audacity, for example.
Microphones configuration
Currently the configurations supported are the following:
- Stereo@48KHz
- Stereo@44.1KHz (default, CD audio quality)
- Stereo@32KHz
- Stereo@16KHz
- Stereo@8KHz
- Mono@48KHz
- Mono@44.1KHz
- Mono@32KHz
- Mono@16KHz
- Mono@8KHz
Mono configurations need a Jumper connecting PB_5 and PB_13 on the Morpho connector to properly work.
Platform compatibility¶
- This board can be currently used with the Nucleo F4 Family only, please see the ST_I2S library compatibility for further information.
- Please note that the main application makes use of the "events" library (i.e. the "ST_Events" library imported as "events" library), which is not included into the "mbed" library.
- The application built against mbed OS can be found here.
Acquiring through the USB on Windows¶
In order to acquire the recorded PCM audio channel with an audio SW on a PC, please connect the expansion board to a USB port of the PC, and the Nucleo board to a USB power supply.
On Windows, click on the speaker icon on the bottom bar, select "Recording devices", "Microphone", "Properties", then click on the "Advanced" panel, and select "1/2 channels, 16 bit, 16/32KHz" according to board configuration.
Open your preferred audio SW, like "Audacity" for example, configure it to acquire a 2-channel stereo at 16KHz (for default configuration), and record.