How can i write and read on SD using FREERTOS e FATFS?

[JTLGE]

Hello,

I am using STEVAL-STWINKT1B development board and I can write and read sd card using setting to SD 4 bits Wide Bus and FATFS.

If I add on STM32CUBEMX as middleware FREERTOS I can't read the SD in fact I get back FR_NOT_READY when I execute the f_open method.

How can I solve this problem?

[SofLit]

Hello,

I suggest to refer to one of examples provided in a CubeFx. For example the one provided in STM32F7 under the path: Projects\STM32F769I_EVAL\Applications\FatFs\FatFs_uSD_RTOS

[Slh · Accepted solution]

Did you adjust the heap-size and task-size enough?

For using RTOS with SDCARD, you better active DMA for SDCARD.

[JTLGE]

In my project on the STM cube MX I modified the following parameters:

Freertos - config parameters- minimal stack 256

Project manage - linker settings Minimum Heap Size 0x400

Project manage - linker settings Maximum Heap Size 0x800

Moreover FatFS has the setting use dma enabled and on the SDMMC1 interface I don't have the tab to select the DMA settings (I think it's set by default but I'm not sure).

this is the task where i use FatFs:

void StartDefaultTask(void *argument)

{

/* USER CODE BEGIN 5 */

FRESULT fres;

uint32_t byteswritten, bytesread; /* File write/read counts */

uint8_t wtext[] = "STM32 FATFS works great!"; /* File write buffer */

fres = f_mount(&SDFatFS, (TCHAR const*)SDPath, 1);

fres = f_open(&SDFile, "TEST.csv", FA_CREATE_ALWAYS | FA_WRITE);

fres = f_write(&SDFile, wtext, strlen((char *)wtext), (void *)&byteswritten);

fres = f_close(&SDFile);

HAL_GPIO_WritePin(GPIOE, GPIO_PIN_1, GPIO_PIN_SET);

/* USER CODE END 5 */

}

[Slh]

Test it once with 1-Bit mode and in RTOS:

change your Stack size of your task to minimum 4KB.

Minimal Stack size 128 word

Total heap size 16000

[JTLGE]

thanks a lot for the help now is working properly writing to sd even in 4 bit mode

[Bsm]

I created implementation with general operations for fatsfs & freertos with CubeMX u can test this code

github.com/Bsm-B/Stm32-FatFs-FreeRTOS/