I am but a lowly intern, cast into the unforgiving fires of firmware development. I have been tasked with implementing a file system onto an STM32 chip, using a w25qxx through SPI. I have been able to successfully read and write to the w25q through SPI, and have a class created to handle the basic i/o with the chip.
I have decided on using FatFS as it is partially built into STM32CubeID, and it seemed to be the best for what our needs are. I have seen quite a few people implement FatFS through on SD cards, but an SD card would be more complexity that we need. In all of the tutorials I saw you need to edit the methods of user_diskio.c to be consistent with the storage you are using. However, when I do this I find that my code never actually uses user_diskio.c, nor does it use diskio.c. I have a line of code set up in these to set an LED to tell if the program ever actually reaches these points in the code, and it appears that it does not.
Method from my user_diskio.cpp
DRESULT USER_read (
BYTE pdrv, /* Physical drive nmuber to identify the drive */
BYTE *buff, /* Data buffer to store read data */
DWORD sector, /* Sector address in LBA */
UINT count /* Number of sectors to read */
)
{
/* USER CODE BEGIN READ */
HAL_GPIO_WritePin(GPIOE, GPIO_PIN_10, GPIO_PIN_SET); //
w25->sectorRead(sector, (char*)buff, count);
return RES_OK;
/* USER CODE END READ */
}
In my main.cpp, I am trying to create a file, write a string to it, close it, and then open it again to read the string.
f_getfree("", &fre_clust, &pfs);
total = (uint32_t)((pfs->n_fatent - 2) * pfs->csize * 0.5);
free_space = (uint32_t)(fre_clust * pfs->csize * 0.5);
fresult = f_open(&fil, "file67.txt", FA_OPEN_ALWAYS | FA_READ | FA_WRITE);
f_puts("This data is from the FILE1.txt. And it was written using ...f_puts... ", &fil);
fresult = f_close(&fil);
fresult = f_open(&fil, "file67.txt", FA_READ);
f_gets(buffer, f_size(&fil), &fil);
f_close(&fil);
fresult returns FR_NOT_ENABLED when I go to open the file, and returns FR_INVALID_OBJECT when I got to close. Attempting to read the file into buffer results in the first byte in the buffer being read as a null char. Is there any additional information I should add?
