Posted on October 20, 2016 at 18:05
Hi.
I'm using the STM32F769I-DISCO board. I'm trying to manage the SD card in FAT FS. I've merged a new project created in CubeMX and the 'FatFs_uSD' example from
STM32F769I_EVAL example.
In Cube I've changed:
- MiddleWares -> FATFS -> SD Card
- Peripherals -> SDMMC2 -> Mode -> SD 4 bits Wide bus
In the main.c I've added:
/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/
extern char SD_Path[4];
/* USER CODE END PV */
(...)
/* USER CODE BEGIN 2 */
FRESULT res; /* FatFs function common result code */
uint32_t byteswritten, bytesread; /* File write/read counts */
uint8_t wtext[] = ''This is STM32 working with FatFs''; /* File write buffer */
uint8_t rtext[100]; /* File read buffer */
FATFS SDFatFs; /* File system object for SD disk logical drive */
FIL MyFile; /* File object */
/*##-1- Link the SD disk I/O driver ########################################*/
res = 0; // FATFS_LinkDriver(&SD_Driver, SD_Path); // It's done in FS init
if (res == 0) {
/*##-2- Register the file system object to the FatFs module ##############*/
res = f_mount(&SDFatFs, (TCHAR const*) SD_Path, 0);
if (res != FR_OK) {
/* FatFs Initialization Error */
//BSP_LED_On(LED_RED);
Error_Handler();
} else {
/*##-3- Create a FAT file system (format) on the logical drive #########*/
res = f_mkfs((TCHAR const*) SD_Path, 0, 0);
if (res != FR_OK) {
//BSP_LED_On(LED_RED);
Error_Handler();
} else {
/*##-4- Create and Open a new text file object with write access #####*/
res = f_open(&MyFile, ''STMTXT'', FA_CREATE_ALWAYS | FA_WRITE);
if (res != FR_OK) {
/* 'STMTXT' file Open for write Error */
//BSP_LED_On(LED_RED);
Error_Handler();
} else {
/*##-5- Write data to the text file ################################*/
res = f_write(&MyFile, wtext, sizeof(wtext),
(void *) &byteswritten);
if ((byteswritten == 0) || (res != FR_OK)) {
/* 'STMTXT' file Write or EOF Error */
//BSP_LED_On(LED_RED);
Error_Handler();
} else {
/*##-6- Close the open text file #################################*/
f_close(&MyFile);
/*##-7- Open the text file object with read access ###############*/
if (f_open(&MyFile, ''STMTXT'', FA_READ) != FR_OK) {
/* 'STMTXT' file Open for read Error */
//BSP_LED_On(LED_RED);
Error_Handler();
} else {
/*##-8- Read data from the text file ###########################*/
res = f_read(&MyFile, rtext, sizeof(rtext),
(UINT*) &bytesread);
if ((bytesread == 0) || (res != FR_OK)) /* EOF or Error */
{
/* 'STMTXT' file Read or EOF Error */
//BSP_LED_On(LED_RED);
Error_Handler();
} else {
/*##-9- Close the open text file #############################*/
f_close(&MyFile);
/*##-10- Compare read data with the expected data ############*/
if ((bytesread != byteswritten)) {
/* Read data is different from the expected data */
//BSP_LED_On(LED_RED);
Error_Handler();
} else {
/* Success of the demo: no error occurrence */
//BSP_LED_On(LED_GREEN);
}
}
}
}
}
}
}
}
/*##-11- Unlink the SD disk I/O driver ####################################*/
FATFS_UnLinkDriver(SD_Path);
/* USER CODE END 2 */
But the HAL_SD_ReadBlocks returns SD_RX_OVERRUN. I allways run in debug.
Where's the problem?
Thanks.
#fatfs #sd #stm32f769i-disco
