SDIO+DMA+FATFS for STM32L476RG (CubeMX 4.25.0+MCU pack 1.11.0)

[Dmitry Kochubey]

Posted on May 01, 2018 at 08:23

Dear friends,

I have an issue with uSD reading and writing in DMA mode (How ever I am able to read and write data on SD card when dma template is off). I used CubeMX to configure

♯

but it did not work for me ''out of the box''.

My CubeMX version is 4.25.0 and L4 MCU package is 1.11.0.

Could you point out what I am doing wrong in configuration or in my code or if it is CubeMX issue, could you please advice me how to solve it?

I found some topics related to SDIO and DMA configuration and tried to implement them :

https://community.st.com/0D50X00009XkVtKSAV

?

https://community.st.com/0D50X00009Xkf5gSAB

?

https://community.st.com/0D50X00009XkYIGSA3

?

Below you find screen shots with my settings and my SW4STM32 project including CubeMX file.

My MCU setup:

My CubeMX configuration:

1) Clock

2)Clock factor

3)NVIC

4)DMA

5)Pin configuration

6)FatFS (sector size)

7)DMA template enabled

#fatfs-sdio #stm32l476 #sdio-dma #sd-card #sdio+dma+fatfs #stm32l4-sdio

[Evgeny Kirshin]

Posted on May 01, 2018 at 16:48

Hi Dmitry,

What exactly is not working?

Are you using RTOS? I have my code running on top of the FREERTOS, generated by CubeMX (same project).

I do not have a separate demo-project, but I can share the files I modified (attached). The fatfs.c is modified to use RTC time for files.

My initialization procedure is as follows:

SD_Initialize();   if(BSP_SD_IsDetected()) {  if(f_mount(&SDFatFs, (TCHAR const*)SDPath, 0) == FR_OK)  {  sd_mounted = 1;      } }�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?

Where:

static void SD_Initialize(void) {  if (isInitialized == 0)  {  BSP_SD_Init();  BSP_SD_ITConfig();   if(BSP_SD_IsDetected())  {  isInitialized = 1;  }  } }�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?

I also attached some screenshots, where I found differences between yours and my project configuration in CubeMX.

As you can see, I have SDMMC1 48MHz clock and SDMMCCCLK clock divider is set to 0. The DMA priority is Very High, but I don't think this should be an issue. Also, I don't use internal pull-ups since I have them externally. Finally, I enabled long filenames support in FatFs.

I hope this helps.

________________

Attachments :

fatfs.c.zip : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006Hxey&d=%2Fa%2F0X0000000b0h%2FyMkSYkSe_W_2WqOT_wnYOkxueK4JxgIZ8ReXGAzJfak&asPdf=false

stm32l4xx_it.c.zip : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006Hxet&d=%2Fa%2F0X0000000b0c%2FhpgKXCq_kBop4KsnaEqnD_4KNP63To1lsk21BCsiXE0&asPdf=false

bsp_driver_sd.c.zip : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006Hxf3&d=%2Fa%2F0X0000000b0g%2F6EaBfDqo7rAttRKkcZtW54xDBML2v566cm2Ttm6xJ3U&asPdf=false

[Dmitry Kochubey]

Posted on May 02, 2018 at 00:23

 ,

 ,

Dear Evgeny,

Thank you very much for such quick and informative reply.

I corrected all my settings according to yours, but I still have the problem with sd card reading.

Regarding to your questions:

1) First, I am able to access an sd card (read/write) with switch off dma template option.

2) In the beginning, I did not use freertos and made a corrections according to your advice in the topic

https://community.st.com/0D70X000006SiUGSA0

 , and the problem was a dma read or write timeout, because I did not receive a callbacks (HAL_SD_RxCpltCallback or HAL_SD_TxCpltCallback).

3) Now, I am trying to run sd card reading in rtos, but the program does not start. I thought that it could be lack of ram memory for task. I changed the task stack size from 128 to 256 and even to 512, but it did not help.

Do you know what could be the problem?

My task is just:

 ,[CODE]

void StartDefaultTask(void const * argument)

 ,

{

 ,

 , /* init code for FATFS */

 ,

 , MX_FATFS_Init(),

 , /* USER CODE BEGIN 5 */

 ,

 , /* Infinite loop */

 ,

 , for(,,)

 ,

 , {

 ,

 , ,  ,HAL_GPIO_TogglePin(LED_GPIO_Port,LED_Pin),

 ,

 , , , osDelay(100),

 ,

 , }

 ,

}

[/CODE]

Could I ask you to share your freertos settings and nvic related to sd card reading?

Thank you in advance for your response.

Best regards,

Dmitry.

[Evgeny Kirshin]

Posted on May 02, 2018 at 16:12

Hi Dmitry,

If you set a breakpoint in your task, does it stop there? If not, it might be an issue with task priorities (although, you have only one task?) Also, have a look at heap size.

Here are the screenshots of the settings from my project.