4 bit SDIO / SD Card / SDMMC issue on NUCLEO-H723ZG STM32H723ZG STM32H7

Hi All,

I have been breaking my head the past few weeks trying to connect an SD card to the STM32H723ZG with no success.

My setup is simple:

1. Evaluation board is NUCLEO-H723ZG.
2. SD card breakout board wired using 4 bit SDIO.
3. 47K pull up resistors
4. using CubeMX to generate the project. FW_H7 1.8.0
5. connected the wires to CN8
6. Removed SB14 SB 15 brideg resistors to the CN11
7. Generate code with cubemx - configure it with SDMMC1, 4 bit SDIO

HW configure is seen in this image:

using 1 wire SDIO with this configuration everything works well.

using 4 wire SDIO we I get an CRC fail inside the HAL_SD_ReadBlocks function .

basically before the main loop and after the peripheral are configure I am trying to run this code:

 retVal = HAL_SD_Init(&hsd1);

 if(retVal == HAL_OK) printf("HAL_SD_Init OK\r\n");

 retVal = HAL_SD_ReadBlocks(&hsd1, buff, 0, 1, HAL_MAX_DELAY);

 if(retVal == HAL_OK) printf("HAL_SD_ReadBlocks OK\r\n");

but the read function fails on a CRC internally.

Also tried to play with SDMMC clock from clock configuration screen

Also tried to play with the clock div.

Also forced clock to at and run in 400Kbit/s like seen in the initCard fucntion.

Any ideas what to do now?

thanks!

Dan