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NUCLEO-F429ZI - SDIO - FatFs Problem

Question asked by Nello Cris on Jun 11, 2018
Latest reply on Jun 12, 2018 by Nello Cris

Dear All,
I’m new to this forum and to stm32 board. I’m trying to connect an SD Card to my board NUCLEO-F429ZI but I’m having some problems with it.
I use STM32CUBEMX to create the project using the standard peripherals settings.
I put SDIO in SD 4 bit interfacing mode. I do not change anything in clock configuration.
I connect the SD Card directly to SDIO PIN without any resistors as in picture SD Card   Nucleo F429ZI Connection
Board PIN    SD Pin
PD2             2 (CMD)
PC8             7 (Dat0)
PC9             8 (Dat1)
PC10            9 (Dat2)
PC11            1 (Dat3)
PC12             5 (CLK)

3.3V             VCC

GND            GND


this is the piece of code:

HAL_UART_Transmit(&huart3, “Start\r\n”, strlen(“Start\r\n”), 0xFFFF);
uint32_t wbytes;
uint8_t wtext[] = “text to write logical disk”;
FATFS_LinkDriver(&SD_Driver, SDPath);
if(f_mount(&SDFatFS, (TCHAR const*)SDPath, 0) == FR_OK)
HAL_UART_Transmit(&huart3, “Mounted\r\n”, strlen(“Mounted\r\n”), 0xFFFF);
res = f_open(&SDFile, “STM32.TXT”, FA_CREATE_ALWAYS | FA_WRITE);
if (res == FR_OK)
HAL_UART_Transmit(&huart3, “Opened\r\n”, strlen(“Opened\r\n”), 0xFFFF);
if(f_write(&SDFile, wtext, sizeof(wtext), (void *)&wbytes) == FR_OK)
HAL_UART_Transmit(&huart3, “Written\r\n”, strlen(“Written\r\n”), 0xFFFF);
HAL_UART_Transmit(&huart3, “Closed\r\n”, strlen(“Closed\r\n”), 0xFFFF);
} else {
char msg15;
sprintf(msg, “Error open: %d\r\n”, res);
HAL_UART_Transmit(&huart3, (uint8_t *)msg, strlen(msg), 0xFFFF);

The function F_MOUNT return FR_OK but the program stops there. Sometimes the f_open function return Error 3: Device not ready. Any suggestion?
Thank you for your time.