STM32 Nucleo expansion boards for working with digital audio. Free Technical Library News

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STM32 Nucleo Digital Audio Expansion Boards

03.07.2020

The new X-NUCLEO-CCA01M1 Expansion Board is an expansion board based on the STA2.1BW Sound Terminal 350-channel high performance audio terminal with digital audio output system. It can be paired with the STM32 Nucleo board and allows you to output a digital audio stream to a pair of speakers connected directly to it. The STM32 MCU controls the STA350BW by I2C, and the I2S bus is used to transmit audio data.

The high performance of STM32 microcontrollers allows you to create low-cost digital audio processing devices, from a digital MEMS microphone to transmitting audio to a PC via USB or local playback using external speakers. With the FP-AUD-SMARTMIC1 software and the X-NUCLEO-CCA01M1 and X-NUCLEO-CCA02M2 expansion boards, a developer can launch their first digital audio application in just hours.

X-NUCLEO-CCA02M2 expansion board contains two MP34DT06J digital MEMS microphones. Up to 4 miniature microphone modules STEVAL-MIC001V1, STEVAL-MIC002V1 and STEVAL-MIC003V1 can be additionally installed on this board. The board allows you to organize the transfer of digital audio from microphones to STM32 through I2S, DFSDM, SPI or SAI peripheral modules (selected by jumpers). Additionally, the board has a USB connector through which you can connect the USB port of the MCU directly to a PC for audio input/output.

FP-AUD-SMARTMIC1 is a dedicated STM32Cube software package for digital audio. This software package implements the functions of input and conversion of data from MEMS microphones, echo cancellation and localization of the direction to the sound source. The processed audio is transferred to a USB host (PC) and a loudspeaker connected to the appropriate expansion boards. Ready-made examples from the FP-AUD-SMARTMIC1 package can be run on the STM32 NUCLEO-F446RE microcontroller board, to which the X-NUCLEO-CCA01M1 and X-NUCLEO-CCA02M2 expansion boards are additionally connected.

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