Hello, How would you go about storing the PCM data on an SD card, instead of via USB on the X-NUCLEO-AMICAM1 expansion board? I'm trying to modify the sample code that was provided. Thanks,

[DOyad.1]

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[SimonePradolini]

Hello @DOyad.1​ 

It should be feasible, but there is no X-NUCLEO from ST that is natively supporting SD card.

SD card pinout changes in base of the HW provider and depends also from the NUCLEO used; there is no a unique standard to support SD for X-NUCLEO-AMICAM1.

Best regards

Simone

[DOyad.1]

Hi Simone @SPRAD.1​ ,

I'm using the STM32L476RG board and a MicroSD breakout board for the SD card. I'm using SPI to communicate with the SD card, which works fine.

My issue is saving the PCM data into an SD card. The sample code provided uses the USB interface. I thought it would be straightforward since a function transmits the data over USB. I could just take the PCM data and store it on an SD Card instead of over USB.

When I play back the audio, I get a lot of noise.

W_002 is the data stored on the SD card, and Audio Track is audio transmitted over USB.

I've been trying to store the data in the PCM buffer on the SD card. 

Is it possible to store the PCM data on the SD Card, or must something else be done before I can save it onto the SD card?

Thanks,

Daniel

[SimonePradolini]

Hello @DOyad.1​ 

AudioProcess is the right callback, where 1ms of audio samples are ready to be used in your application.

How are you saving the files? If it is a .wav, have you added the proper header and description in the file before opening it and start saving data?

Look at the example Datalog_Audio available here: https://www.st.com/en/embedded-software/stsw-stlkt01.html

It has been developed on another ST platform, but it is still based on an STM32L4, so porting should be feasible.

Let me know if this can help you

Best regards

Simone

[DOyad.1]

Hi Simone,

I'm using the STM32L476RG board and a MicroSD breakout board for the SD card. I'm using SPI to communicate with the SD card, which works fine.

My issue is saving the PCM data into an SD card. The sample code provided uses the USB interface. I thought it would be straightforward since a function transmits the data over USB. I could just take the PCM data and store it on an SD Card instead of over USB.

When I play back the audio, I get a lot of noise.

W_002 is the data stored on the SD card, and Audio Track is audio transmitted over USB.

I've been trying to store the data in the PCM buffer on the SD card.

Is it possible to store the PCM data on the SD Card, or must something else be done before I can save it onto the SD card?

Thanks,

Daniel