SDCARD does not work with 4bits wide bus

[JBond.1]

Hi I have STM32F407 and after updating STM32CubeMX 6.6.1 -> 6.9.2 I faced the same issue with SD card:
https://community.st.com/t5/stm32cubemx-mcus/sdcard-does-not-work-fr-not-ready-when-migrating-from-fw-f4-v1/m-p/115499#M3876

It seems that with previous version we were working with 1bit wide bus even if we set 4bit wide bus. Although GPIOS were set for 4bits (SDIO_D0, SDIO_D1, SDIO_D2, SDIO_D3).

So after upgrading it changed to 4bits wide bus, but now we get `FR_NOT_READY`, `HAL_SD_ERROR_REQUEST_NOT_APPLICABLE`

/* If requested card supports wide bus operation */
 if((scr[1U] & SDMMC_WIDE_BUS_SUPPORT) != SDMMC_ALLZERO)
 {
 //...
 return HAL_SD_ERROR_NONE;
 }
 else
 {
 return HAL_SD_ERROR_REQUEST_NOT_APPLICABLE;
 }

 

How do I fix this and make SD card work with 4bits wide bus?

[JBond.1]

I think STM32CubeMX has introduced a bug?

Initialization needs to be done with 1B and after that it should switch to 4B mode?

 

static void MX_SDIO_SD_Init(void)
{

 /* USER CODE BEGIN SDIO_Init 0 */

 /* USER CODE END SDIO_Init 0 */

 /* USER CODE BEGIN SDIO_Init 1 */

 /* USER CODE END SDIO_Init 1 */
 hsd.Instance = SDIO;
 hsd.Init.ClockEdge = SDIO_CLOCK_EDGE_RISING;
 hsd.Init.ClockBypass = SDIO_CLOCK_BYPASS_DISABLE;
 hsd.Init.ClockPowerSave = SDIO_CLOCK_POWER_SAVE_DISABLE;
 hsd.Init.BusWide = SDIO_BUS_WIDE_4B; // Initialization needs to be done with 1B?
 hsd.Init.HardwareFlowControl = SDIO_HARDWARE_FLOW_CONTROL_DISABLE;
 hsd.Init.ClockDiv = 12;
 /* USER CODE BEGIN SDIO_Init 2 */
 hsd.Init.BusWide = SDIO_BUS_WIDE_1B; // FIX?
 /* USER CODE END SDIO_Init 2 */

}

 

Now we need to override `hsd.Init.BusWide = SDIO_BUS_WIDE_1B;` for initialization to use 1bit and after initialization it switches to 4bit, no?

 

__weak uint8_t BSP_SD_Init(void)
{
 uint8_t sd_state = MSD_OK;
 /* Check if the SD card is plugged in the slot */
 if (BSP_SD_IsDetected() != SD_PRESENT)
 {
 return MSD_ERROR;
 }
 /* HAL SD initialization */
 sd_state = HAL_SD_Init(&hsd);
 /* Configure SD Bus width (4 bits mode selected) */
 if (sd_state == MSD_OK)
 {
 /* Enable wide operation */
 if (HAL_SD_ConfigWideBusOperation(&hsd, SDIO_BUS_WIDE_4B) != HAL_OK)
 {
 sd_state = MSD_ERROR;
 }
 }

 return sd_state;
}

 

Can STM32CubeMX team comment on this?

So STM32CubeMX 6.6.1 was correct and new versions have introduced a bug?

[AScha.3]

just search here in forum - see discussion + solution .

[TDK]

There is this thread:

https://community.st.com/t5/stm32cubemx-mcus/sdcard-does-not-work-fr-not-ready-when-migrating-from-fw-f4-v1/td-p/115499

But it looks like the ST member who responded doesn't realize how SD works and thinks the change was a fix, rather than a bug/regression. So good luck with that.

[Ghofrane GSOURI]

Hello @JBond.1 @TDK @AScha.3 

Thank you all  for your detailed explanation , and it's thanks to your contribution  that we're going to have a more mature version of MX.

An internal ticket is raised to dev team in order to fix this issue asap .

Internal ticket number: 155983 

 

Ghofrane

 

[Marcelo Jimenez]

Hi,

After some debugging, I found that there is a parameter called SDMMC clock divide factor that defaults to zero. The path to it is Connectivity -> SDMMC1 -> Configuration -> Parameter Settings -> SDMMC clock divide factor. I have set it to 1, which means one half of the kernel clock frequency, and now everything works, even with the triple initialization. I had 200 MHz in the original frequency, so I think this means the controller will operate at 100 MHz.

 

I suggest anyone with a similar problem to test increasing this parameter until the device works, maybe to a binary search, should take less than 10 attempts.

 

By the way, I am using 4 bit mode, so I still hope I can get a good speed from the card. Still, without a level converter circuit to 1.8 Volts, I know it is not possible to go full speed.

 

I did some changes to the original code, which I got from a tutorial video from ST. If anyone is interested, here is the code:

/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_MDMA_Init();
MX_ADC3_Init();
MX_TIM1_Init();
MX_USART1_UART_Init();
MX_SDMMC1_SD_Init();
MX_FATFS_Init();
/* USER CODE BEGIN 2 */
...
res = f_mkfs((TCHAR const *)"", FM_ANY, 0, rtext, sizeof rtext);
if (res != FR_OK) {
 Error_Handler();
}
res = f_mount(&SDFatFS, (TCHAR const *)"", 1);
if (res != FR_OK) {
 Error_Handler();
}
// Open file for writing (Create)
res = f_open(&SDFile, "STM32.TXT", FA_CREATE_ALWAYS | FA_WRITE);
if (res != FR_OK) {
 Error_Handler();
}
// Write to the text file
res = f_write(&SDFile, wtext, strlen((char *)wtext), (void *)&bytes_written);
if ((bytes_written == 0) || (res != FR_OK)) {
 Error_Handler();
}
f_close(&SDFile);
/* FS == NULL -> umount */
res = f_mount(NULL, "", 0);
/* USER CODE END 2 */

 

[AScha.3]

btw

i wrote, you should set a max. clk of 50MHz...

>3. clock smmc with 50MHz , or lower until its working.