STM32CubeIDE : SDMMC Mode unable to set SD 4-Bit Mode (Bug Report ?)

[Karan 123]

Hi,

I am working on STMCubeIDE 1.3.0 with STM32722VE LQFP-100 Package .

SD 1-Bit mode is working Fine for me .

When I am trying to set SD 4-bit the code always generate SD 1-Bit mode .

Is there any Bug ?

hsd2.Init.BusWide = SDMMC_BUS_WIDE_1B;

Also , By changing to SDMMC_BUS_WIDE_4B with DMA SDMMC_TX, SDMMC_RX and

SDMMC Interrupt .

SDMMC Card is not working .

--

Karan

[TDK]

It is initialized in stages. First it's initialized as 1bit, then it switches to 4bit.

[Tesla DeLorean]

Agreed, usually it is brought up in one mode and then switched if successful.

ST has been a bit inconsistent about how they do this across lines and HAL releases, some have similar code in HAL_SD_Init() whilst other pop it out a level in the BSP side initialization code.

If 1-bit mode doesn't work 4-bit surely won't. And 4-bit mode is a lot less tolerant of wiring, loading/drive and skewing issues. Real easy to get it to not work.

[Karan 123]

Hi,

Thanks... Both of you...

1-bit is working as my end . I am using SDMMC2 .

But HAL_SD_ConfigWideBusOperation() is not generated at my setup as per below setting..

Any thing I am missing..

--

Karan

[TDK]

> Any thing I am missing..

I don't see anything wrong in your setup.

I generated a project and initialized SD as 4-bit and pasted the screenshot of what it generated. I don't see why it would behave any differently for you.

You can always edit the CubeMX generated code.

[Karan 123]

Ok..

Are you using STM32CubeIDE ​1.3.0.

Please share your generated .c file from your setup.

--

Karan​

[Karan 123]

Hi,

Thanks​

I have succeeded to work with

SD ​4-Bit Mode by manually adding in CubeMX generated Code. Able to Create txt file.

How to be sure that 4-bit Mode Configure and Worked properly..?

--

Karan​

[TDK]

> How to be sure that 4-bit Mode Configure and Worked properly..?

I would examine the traces on a scope, or time a particularly long transaction and ensure it completes faster than would be possible in 1-bit mode.