Question
sector allignments in FATfs on external flash with STM32F767
I'm using FATfs file system on external flash (16MB) using STM32F767, I'm able to create/ read/ write/ close files.
I've created 4 files: sequence of handing files and sector no assigned to them are as,
Created/ Write File1 - sector 8
Created/ Write File2 - sector 9
Created/ Write File3 - sector 10
unlink File2
Created/ Write File4 - sector 11
before creating File 4 I've deleted File 2 using f_unlink("0:/FILE2.TXT"); function, now I expect if I create File4 then sector no 9 should be assigned to this file as it is free sector after File2 is deleted. Is there any way to reused the free sector after deleting files.
if(f_open(&MyFile, "0:/FILE1.TXT", FA_READ | FA_CREATE_ALWAYS | FA_WRITE) != FR_OK)//FA_CREATE_ALWAYS | FA_WRITE
{
/* 'STM32.TXT' file Open for write Error */
Error_Handler();
}
else
{
/* Write data to the text file */
res = f_write(&MyFile, wtext, sizeof(wtext), (void *)&byteswritten);
if((byteswritten == 0) || (res != FR_OK))
{
/* 'STM32.TXT' file Write or EOF Error */
Error_Handler();
}
else
{
if(f_open(&MyFile2, "0:/FILE2.TXT", FA_READ | FA_CREATE_ALWAYS | FA_WRITE) != FR_OK)//FA_CREATE_ALWAYS | FA_WRITE
{
/* 'STM32.TXT' file Open for write Error */
Error_Handler();
}
else
{
res = f_write(&MyFile2, wtext2, sizeof(wtext2), (void *)&byteswritten);
if((byteswritten == 0) || (res != FR_OK))
{
/* 'STM32.TXT' file Write or EOF Error */
Error_Handler();
}
/* Read data from the text file */
if(f_open(&MyFile3, "0:/FILE3.TXT", FA_READ | FA_CREATE_ALWAYS | FA_WRITE) != FR_OK)//FA_CREATE_ALWAYS | FA_WRITE
{
/* 'STM32.TXT' file Open for write Error */
Error_Handler();
}
else
{
/* Write data to the text file */
res = f_write(&MyFile3, wtext, sizeof(wtext), (void *)&byteswritten);
if((byteswritten == 0) || (res != FR_OK))
{
/* 'STM32.TXT' file Write or EOF Error */
Error_Handler();
}
else
{
}
}
f_unlink("0:/FILE2.TXT");
if(f_open(&MyFile4, "0:/FILE4.TXT", FA_READ | FA_CREATE_ALWAYS | FA_WRITE) != FR_OK)//FA_CREATE_ALWAYS | FA_WRITE
{
/* 'STM32.TXT' file Open for write Error */
Error_Handler();
}
else
{
/* Write data to the text file */
res = f_write(&MyFile4, wtext, sizeof(wtext), (void *)&byteswritten);
if((byteswritten == 0) || (res != FR_OK))
{
/* 'STM32.TXT' file Write or EOF Error */
Error_Handler();
}
else
{
}
}