stm32f446re microSD SDIO

The screenshots are super interesting, but what's going to determine if this works or not is the code generated, and pins configured/wired up suitably.

Provide a clear and accurate diagram of the microSD card socket, link to parts used.

Make sure no pins conflict or require solder bridges.

I tried doing your same sd card adapter mod too. Works fine with SPI  (like arduino uses). But after 3-4 different adapters, i couldnt get any reliable SDIO going. I gave up and bought a couple different breakouts.

I tried this one,

https://www.waveshare.com/micro-sd-storage-board.htm

I ended up, removing all the 10k pullups. I added a 47k resistor network on the backside at the pins, and only pulled up D0-D3 and CMD to 3.3V, and did not pullup the CLK. It works fine now.

Have you already configured the SDIO_CardDetect pin?

I have made a new project using the SDIO without DMA as I showed on my original post just to keep everything simple. I have connected all the SD signals to a breadboard with jumper wires, on the breadboard I have place six 47k pull-up resistors on each signal and from there with jumper wires I am connecting all the signals on the corresponding pins of the Nucleo. The think is that I changed the breadboard with a newer one and the SD card now works (so the problem must been a dodgy connection). I also tried the SDIO interface on 48 MHz and it works. I made an simple program for writing 10 MB of data on the SD card.

for(uint32_t i=0; i<10485760; i++)

The problem here was that some  times I got an error on closing and the other times not all the data was written on the SD card. So I thought maybe I need to occasionally save the data before closing so I did with that code.

for(uint32_t i=0; i<10485760; i++)

{

      {

}

Now I have achieved to write all the 10 MB most of the time but not always. Is there something else that it maybe wrong or is just the jumper wires acting as an antenna and interfering the the signals causing errors?

hi,

G..Mario

I am not sure what's the adapter you are using, I just happened to have similar problem recently.

Here is an extension board for F446 Nucleo I made recently.

(Guess it's not well routed....:P)

I use F446 EVAL board schematic as referencefor those pull-up resistors values.

In the end, I found that my tracks are not well routed, and huge power noise is generated.

(Currently working on how to improve it)

Once I lower done the CLK to few MHz ( CLK = SDIO clk/(divide factor + 2) ), then everything works just fine.

Here are some of my experience, hope it helps:

1.Firstly disable file system so that Ican focus on low level driver parts.

2. Disable DMA for the momentand make sure polling mode can work.

3. Lower the clock speed, down to 1MHz or even few hundred kHz.

4. Make sureMX_SDIO_SD_Init() really initialize the sd card from 1 bit mode to 4 bit mode.

5. If initialized ok, try to callGetCardInfo orGetCardStatus.

Good luck!