STM32F429 DMA with SDIO

[MobileWill]

Hi,

I am running into DMA conflicts with SDIO and SPI5 on stream ID 2,3. I am not using SPI6 but SDIO still won't let me use Stream id 2,6. With SPI6 set to false shouldn't I be able to use 2,6 for SDIO?

Thanks.

[MobileWill]

I changed SPI5 RX to 2,5 same as SPI6 TX. And then I could leave SDC to 2,3. Strange it doesn't work the other way around. Am I missing something?

[Giovanni]

Hi,

Not all channels can be assigned to any peripheral, read the Reference Manual in the DMA section and see if SDIO has alternate channels.

Giovanni

[MobileWill]

Forgot to ask if we can use SDIO in 1-bit mode and if so how do you set it? 4-bit is default?

[Giovanni]

The driver uses 4 bits mode, I am not sure about the required changes right now.

You could use an SPI port and the MMC_SPI driver.

Giovanni

[MobileWill]

Hi,

Not all channels can be assigned to any peripheral, read the Reference Manual in the DMA section and see if SDIO has alternate channels.

Giovanni

I know, its 2,3 and 2,6. But I was asking why it is conflicting with SPI6 when it is not enabled. But setting SPI5 to conflict with SPI6 is okay.

[MobileWill]

The driver uses 4 bits mode, I am not sure about the required changes right now.

You could use an SPI port and the MMC_SPI driver.

Giovanni

Thanks that was my backup. Really wanted to give SDIO a try.

How does card detect work for the insert handler? Does it use the CD pin or some other way? If it uses CD where do you define the pin used?

[MobileWill]

I figured out how the card detect stuff works.