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=falsestm32l4xx_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=falsebsp_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.

[Dmitry Kochubey]

Posted on May 03, 2018 at 17:24

Dear Evgeny,

Thanks a lot for your support. I did a corrections according to your screen shots.

I found out that freezed program start was caused by error in timer configuration. I changed the input for sd card clock to PLLQ with 40MHz and it partially works now (I am able to blink a led in freertos:)).

Another thing is that my f_mount function with mount later option 

f_mount(&SDFatFS, (TCHAR const*)SDPath, 0) returns FR_OK and it is a good sign,

however if I select f_mount(&SDFatFS, (TCHAR const*)SDPath, 1)

it returns FR_DISK_ERR.

Below you could see a code that generates an error:

    fmt = check_fs(fs, bsect);            /* Load sector 0 and check if it is an FAT-VBR as SFD */

    if (fmt == 2 || (fmt < 2 && LD2PT(vol) != 0)) {    /* Not an FAT-VBR or forced partition number */        for (i = 0; i < 4; i++) {        /* Get partition offset */            pt = fs->win + (MBR_Table + i * SZ_PTE);            br[i] = pt[PTE_System] ? ld_dword(pt + PTE_StLba) : 0;        }        i = LD2PT(vol);                    /* Partition number: 0:auto, 1-4:forced */        if

:)

i--;        do {                            /* Find an FAT volume */            bsect = br[i];            fmt = bsect ? check_fs(fs, bsect) : 3;    /* Check the partition */        } while (LD2PT(vol) == 0 && fmt >= 2 && ++i < 4);    }    if (fmt == 4) return FR_DISK_ERR;        /* An error occured in the disk I/O layer */

Today evening I will try to debug it and write you back with my results tomorrow. If you have any suggestions, please write me back. I appreciate your help.

Best regards,

Dmitry.

[Dmitry Kochubey]

Posted on May 10, 2018 at 23:11

Dear Evgeny,

I am sorry for the delay in response.

I rewrite the bsp_driver_sd.c according to FatFs_uSD_DMA_RTOS for l476g-eval. I downgrade my CubeMX from 4.25 to 4.24 and change my CubeMX settings according to your screen shots, but I still did not solve the issue.

I created project on GitHub:

https://github.com/uid17/uSD_DMA_RTOS_STM32l476RG

I appreciate any suggestions and commits of you and community.

Thank you in advance.

Best regards,

Dmitry.

P.S.

I also found the recommendation of

Vasiliev.Alexander

in the topic

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

I will try it today.‌

[Dmitry Kochubey · Accepted solution]

Posted on May 11, 2018 at 09:20

Finally, I get it worked with CubeMX 4.25 and MCU pack 1.0!

The list of issues:

1) Missing line in time configuration

RCC_OscInitStruct.PLL.PLLM = 1; //Missed line

2) Change according to

Kirshin.Evgeny

‌

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

3) Change according to

Vasiliev.Alexander

‌

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

4) I suggest to use short filenames written in lower case letters.

I will update the git repository I mentioned behind.

Thanks a lot to

Kirshin.Evgeny

‌ and

Vasiliev.Alexander

‌. You help deserves a beer;)

Best regards,

Dmitry.

[Evgeny Kirshin]

Posted on May 11, 2018 at 16:36

I am glad you solved your problem.

Was the issue only in one line to set the PLLM? 

Which toolchain/compiler are you using?

Long file names with capitals work for me (there is a setting in FatFs configuration to enable long file name support).

[Imen.D]

Posted on May 11, 2018 at 17:26

Hello

dmitry.kochubey

,

About the missing PLLM code generation for STM32L4 Series, this issue is fixed with the new version 4.1.

Best Regards,

Imen

[Dmitry Kochubey]

Posted on May 11, 2018 at 21:45

Dear Evgeny,

I am using SW4STM32 + GCC. Regarding to the issues in the beginning I had to fix time config, then I modify bsp according to your advice and finally I also had the same issue as

Vasiliev.Alexander

‌ and I fixed it according his suggestions. Long file names with capitals work for me as well but I write this recommendation for beginners in order to reduce effect of file names on sd reading process.

Best regards,

Dmitry.