fatfs 自动检测是否有文件系统

FRESULT scan_files (char* path){ FRESULT resFILINFO fnoDIR dirint ichar *fn#if _USE_LFN static char lfn[_MAX_LFN * (_DF1S ? 2 : 1) + 1]fno.lfname = lfnfno.lfsize = sizeof(lfn)#endif res = f_opendir(&dir, path)if...

f_open的返回不为零的可能性有很多种，可以李斗绝根据具体哪姿的返回销侍值，找到错误类型。

下面是具体的错误类型：

typedef enum {

FR_OK = 0, /* (0) Succeeded */

FR_DISK_ERR, /* (1) A hard error occurred in the low level disk I/O layer */

FR_INT_ERR, /* (2) Assertion failed */

FR_NOT_READY, /* (3) The physical drive cannot work */

FR_NO_FILE, /* (4) Could not find the file */

FR_NO_PATH, /* (5) Could not find the path */

FR_INVALID_NAME, /* (6) The path name format is invalid */

FR_DENIED, /* (7) Access denied due to prohibited access or directory full */

FR_EXIST, /* (8) Access denied due to prohibited access */

FR_WRITE_PROTECTED, /* (10) The physical drive is write protected */

FR_INVALID_DRIVE, /* (11) The logical drive number is invalid */

FR_NOT_ENABLED, /* (12) The volume has no work area */

FR_NO_FILESYSTEM, /* (13) There is no valid FAT volume */

FR_MKFS_ABORTED, /* (14) The f_mkfs() aborted due to any parameter error */

FR_TIMEOUT, /* (15) Could not get a grant to access the volume within defined period */

FR_LOCKED, /* (16) The operation is rejected according to the file sharing policy */

FR_NOT_ENOUGH_CORE, /* (17) LFN working buffer could not be allocated */

FR_TOO_MANY_OPEN_FILES, /* (18) Number of open files >_FS_SHARE */

FR_INVALID_PARAMETER /* (19) Given parameter is invalid */

} FRESULT

还有f_mount也有返回值，你应该看看是否mount成功。

最有可能是念判正写文件没有成功

另冲樱外一个可能是你不仔悔小心设置了文件为隐藏,不过可能性很小,除非你调用文件系统函数主动更改过文件属性

FatFS写文件的一般步骤是:

使用f_open函数打开文件,f_lseek函数将文件指针移动到文件尾(可选),f_write文件进行写,f_close关闭并将缓存数据(如果有的话)写入SD卡

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