I am using STM32H7A3 board. I am trying to integrate SD Card using SPI. I am getting FR_DISK_ERR when I try to do f_mount. Attached source code.

[JJoy.1]

When i tried to give Pull ups for SPI pins except SPI1_SCK, i am getting FR_NOT_READY error.

I am completely stuck in this issue.

Please have a look into this and provide a solution for me.

Thanks in advance.

Jestina

[Tesla DeLorean]

One could easily sink hours into this.

Any strong reason for not using the SDMMC interface and the working code available for that?

[devtty]

You should take a look at this:

https://01001000.xyz/2020-08-09-Tutorial-STM32CubeIDE-SD-card/

And use the drivers that are linked in that post with the fatfs middleware. I got it successfully working on an stm32l476rg-nucleo with an SD card break out board from adafruit.

[Tesla DeLorean]

Yes, the AdaFruit SPI implementation (see BSP) for NUCLEO is also a good starting point but the NUCLEO-L476RG also supports SDMMC and will be significantly faster.

[JJoy.1]

Hi,

First i tried to implement using SDMMC interface. But 9 pin SD break out board is not available in our country. So i tried with SPI.

[JJoy.1]

Hi,

Thanks for the reply.

I have created new code as per the below link and used the driver files mentioned there.

https://01001000.xyz/2020-08-09-Tutorial-STM32CubeIDE-SD-card/

Entire source code is attached here.

In user_diskio_spi.c file - line no. 337 - (send_cmd(CMD0, 0) is returning 0xFF.

I am using SDHC SanDisk card of size 16GB.

I tried with FCLK_FAST(); and FCLK_SLOW(); - Both are giving the same result.

I am using STM32H7A3 board.

[JJoy.1]

A small update..

static

int spiselect (void) /* 1:OK, 0:Timeout */

{

CS_LOW(); /* Set CS# low */

xchg_spi(0xFF); /* Dummy clock (force DO enabled) */

if (wait_ready(500)) return 1; /* Wait for card ready */

despiselect();

return 0; /* Timeout */

}

This is returning 0 (Timeout) every time..

[JJoy.1]

Please ignore the above update..

spiselect() is returning 1.

But

do {

res = xchg_spi(0xFF);

} while ((res & 0x80) && --n);

return res;

res is having value 0xFF.

[Tesla DeLorean]

Unfortunately there's probably not a lot of debugging support, try the library author for consultancy

Could be something electrical, so pull-ups, or how the chip-select transition before/after the transaction, or basic connectivity.

A scope or logic analyzer might help in this regard, as well as an understanding of the protocol for the SD/MMC cards.

STM32Cube_FW_H7_V1.8.0\Drivers\BSP\Adafruit_Shield\adafruit_802_sd.c

STM32Cube_FW_H7_V1.8.0\Projects\NUCLEO-H743ZI\Applications\FatFS\FatFS_uSD_Standalone\Src\stm32h7xx_nucleo_bus.c

[JJoy.1]

@devtty

I tried the SD card integration as per the link you mentioned. Do you have any idea on why i am getting send_cmd(CMD0, 0) is returning 0xFF.(user_diskio_spi.c line no.337)

Jestina