Using both I2S and SDIO

I want to play audio on STM32F4 Discovery board. Audio is stored in SD card which connected by SDIO.

On discovery board, I see below connections.

I2S3_SCK -- PC10 -- (SCLK) CS43L22

I2S3_SD -- PC12 -- (SDIN) CS43L22

but PC10 & PC12 are also connected to SDIO_D2 and SDIO_CK. SDIO has no alternate pins.

Any suggestion on how to move I2S3_SCK and I2S3_SD to PB3 & PB5 alternate pins on discovery board.

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Best answer by STTwo-32

If you are looking to use the CS43L22, you should use the PC10 for I2S3_SCK and PC12 I2S3_SD. I think you will need to move to SPI for your SD card.

Best Regards.

STTwo-32

Technical Moderator

You can use PB5 for I2S3_SCK and the PB3 for I2S3_SCK.

Best Regards.

STTwo-32

Nico3Author

Graduate II

but audio codec CS43L22 is connected to PC10 and P12 as per schematic of discovery board.

Super User

So you have to cut the trace PC12 to CS43L22 (DIN) and solder a wire to PB5 .

Then SDIO in 1-bit mode is possible. (1-bit mode is fast enough for audio and more easy to get it running than 4-bit)

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Or try using the spi-mode to access sd-card, dont need the sdio-pins then.

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Other way to play audio: use the USB -> MSC host , play from usb-stick then .

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