/* USER CODE BEGIN 2 */
printf("\r\n ****** FatFs Example ******\r\n\r\n");
/*##-1- Register the file system object to the FatFs module ##############*/
retSD = f_mount(&fs, "", 0);
if(retSD)
{
printf(" mount error : %d \r\n",retSD);
Error_Handler();
}
else
printf(" mount sucess!!! \r\n");
/*##-2- Create and Open new text file objects with write access ######*/
retSD = f_open(&fil, filename, FA_CREATE_ALWAYS | FA_WRITE);
if(retSD)
printf(" open file error : %d\r\n",retSD);
else
printf(" open file sucess!!! \r\n");
/*##-3- Write data to the text files ###############################*/
retSD = f_write(&fil, wtext, sizeof(wtext), (void *)&byteswritten);
if(retSD)
printf(" write file error : %d\r\n",retSD);
else
{
printf(" write file sucess!!! \r\n");
printf(" write Data : %s\r\n",wtext);
}
/*##-4- Close the open text files ################################*/
retSD = f_close(&fil);
if(retSD)
printf(" close error : %d\r\n",retSD);
else
printf(" close sucess!!! \r\n");
/*##-5- Open the text files object with read access ##############*/
retSD = f_open(&fil, filename, FA_READ);
if(retSD)
printf(" open file error : %d\r\n",retSD);
else
printf(" open file sucess!!! \r\n");
/*##-6- Read data from the text files ##########################*/
retSD = f_read(&fil, rtext, sizeof(rtext), (UINT*)&bytesread);
if(retSD)
printf(" read error!!! %d\r\n",retSD);
else
{
printf(" read sucess!!! \r\n");
printf(" read Data : %s\r\n",rtext);
}
/*##-7- Close the open text files ############################*/
retSD = f_close(&fil);
if(retSD)
printf(" close error!!! %d\r\n",retSD);
else
printf(" close sucess!!! \r\n");
/*##-8- Compare read data with the expected data ############*/
if(bytesread == byteswritten)
{
printf(" FatFs is working well!!!\r\n");
}
/* USER CODE END 2 */
/* USER CODE BEGIN 4 */
static void Error_Handler(void)
{
printf("something wrong ....\r\n");
/* User may add here some code to deal with this error */
while(1)
{
}
}
/* USER CODE END 4 */
/* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*/
static void Error_Handler(void);
/* USER CODE END PFP */
FRESULT f_mount (
FATFS* fs, /* Pointer to the file system object (NULL:unmount)*/
const TCHAR* path, /* Logical drive number to be mounted/unmounted */
BYTE opt /* 0:Do not mount (delayed mount), 1:Mount immediately */
)
4.f_read
从一个打开的文件中读取数据
1
FRESULT f_read (
2
FIL* fp, /* Pointer to the file object */
3
void* buff, /* Pointer to data buffer */
4
UINT btr, /* Number of bytes to read */
5
UINT* br /* Pointer to number of bytes read */
6
)
5.f_write
写入数据到一个已打开的文件
1
FRESULT f_write (
2
FIL* fp, /* Pointer to the file object */
3
const void *buff, /* Pointer to the data to be written */
4
UINT btw, /* Number of bytes to write */
5
UINT* bw /* Pointer to number of bytes written */
6
)
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