Hi,
I have a mass storage that format a fat_fs volume and create a file when I plug the device by USB. Here is how I create a file :
int lErr;
char lPath[MAX_PATH_LEN];
snprintf(lPath, MAX_PATH_LEN, "/NAND:/%s", aDstFileName);
struct fs_file_t lFile;
fs_file_t_init(&lFile);
lErr = fs_open(&lFile, lPath, FS_O_CREATE | FS_O_RDWR);
if (lErr < 0) {
LOG_ERROR("Failed to open %s: %d", lPath, lErr);
return E_UNEXPECTED_RESULT;
}
lErr = fs_seek(&lFile, 0, FS_SEEK_SET);
if (lErr < 0) {
LOG_ERROR("Failed to seek %s: %d", lPath, lErr);
return E_UNEXPECTED_RESULT;
}
lErr = fs_write(&lFile, aBuffer, aBufferSize);
if (lErr < 0) {
LOG_ERROR("Failed to write %s: %d", lPath, lErr);
return E_UNEXPECTED_RESULT;
}
lErr= fs_close(&lFile);
if (lErr< 0) {
LOG_ERROR("Failed to close %s: %d", lPath, lErr);
return E_UNEXPECTED_RESULT;
}
return SUCCESS;
}
It works fine, and I can see my file is present when I plug the USB. Even if I remove it, it is re-created when I unplug/replug the USB.
I would like to be able to read a file I would drag and drop in the mass storage. In windows, I create a TEST.TXT and I drag and drop in in the mass storage. Then, when I unplug the USB, and before unmounting the volume, here is what I do :
int lErr;
char lPath[MAX_PATH_LEN];
char lPath2[MAX_PATH_LEN];
char lPath3[MAX_PATH_LEN];
snprintf(lPath, MAX_PATH_LEN, "/NAND:/%s", aFileName);
snprintf(lPath2, MAX_PATH_LEN, "NAND:/%s", aFileName);
snprintf(lPath3, MAX_PATH_LEN, "/%s", aFileName);
struct fs_file_t lFile;
fs_file_t_init(&lFile);
lErr = fs_open(&lFile, lPath, FS_O_READ);
if (lErr < 0) {
LOG_ERROR("Failed to open %s: %d", lPath, lErr);
// return E_UNEXPECTED_RESULT;
}
lErr = fs_open(&lFile, lPath2, FS_O_READ);
if (lErr < 0) {
LOG_ERROR("Failed to open %s: %d", lPath2, lErr);
// return E_UNEXPECTED_RESULT;
}
lErr = fs_open(&lFile, lPath3, FS_O_READ);
if (lErr < 0) {
LOG_ERROR("Failed to open %s: %d", lPath3, lErr);
return E_UNEXPECTED_RESULT;
}
lErr = fs_read(&lFile, aBuffer, aBufferSize);
if (lErr < 0) {
LOG_ERROR("Failed to read %s: %d", lPath, lErr);
return E_UNEXPECTED_RESULT;
}
lErr = fs_close(&lFile);
if (lErr < 0) {
LOG_ERROR("Failed to close %s: %d", lPath, lErr);
return E_UNEXPECTED_RESULT;
}
return SUCCESS;
But here, the fs_open() fails with error -2 (no such file or directory) :
EDIT : when I try the same code with the file I create each time I plug the USB, it works.
What am I missing?
2nd question : is there a way to list files present in the drive?
Thank you very much
