SD card writing in polling mode without DMA nor FreeRTOS

[KhalieAli]

I am trying to write in the SD card in polling mode and it works successfully first two time and when i try to open the same file and write to it is fails and stuck at function " HAL_SD_ReadBlocks " at file stm32h7xx_hal_sd.c at the following condition:

if(((HAL_GetTick()-tickstart) >= Timeout) || (Timeout == 0U))

[Walid ZRELLI]

Hello @KhalieAli​ ,

Welcome to our ST Community :smiling_face_with_smiling_eyes:

In order to allow a better analysis of your problem, could you please share the project file to reproduce this issue, so that we can give you an answer.

Thanks in advance.

BeST Regards,

Walid

[KhalieAli]

Hello @Walid ZRELLI​ 

using generated APIs at "sdmmc.h" and "fatfs.h" i call MX_SDMMC1_SD_Init(); MX_FATFS_Init(); in the initialization

• then at run time i made the following code in polling mode and i am not using DMA

if(f_mount(&FatFsSystem, (TCHAR const *)SYSTEM_PARTITION, 0) == FR_OK)

{

// Open file HelloWorld

if(f_open(&elffile, "LogFile.txt", (FA_CREATE_ALWAYS | FA_WRITE )) == FR_OK)

{

char myData[] = "Hello Bent, It is Workking now \nthanks, it is me khalid";

f_puts(myData,&elffile);

f_close(&elffile);

}

}

it success first time but when i call this code at the second time it stuck waiting time out which is very large number and when i decreased it the SD card read write operation never worked

thanks in advance

[Walid ZRELLI]

Hello @KhalieAli​ ,

You can refer to the following example provided in the H7 firmware package:

• Projects\STM32H743I-EVAL\Applications\FatFs\FatFs_uSD_Standalone

This may help you.

BeST Regards,

Walid