FatFs f_open() hard fault

[meco54]

int main(void)
{
FATFS FatFs;

FIL fil;

FRESULT fr;

UINT bw;

fr = f_mount(&FatFs, "", 0);

if (fr != FR_OK) {

return (int)fr;

}

fr = f_open(&fil, "example.txt", FA_WRITE | FA_CREATE_ALWAYS);

if (fr != FR_OK) {

f_mount(NULL, "", 0);

return (int)fr;

}

f_close(&fil);

}
This is the main.c file. While running the code I get a hard fault issue at f_open. 

I use SDIO mode SD 1 bit

Kindly help

[Tesla DeLorean]

Whatever is happening, it's not in this top-level code. No idea of STM32 or board involved.

Establish where the hard fault is actually occurring. Do this with a suitably instrumented HardFault_Handler() rather than a while(1) loop

Would suggest moving FATFS structure off the stack, and clearing the other structures.

Returning from main() will fail and potentially fault the MCU, where would it return too?

[AScha.3]

First you have to mount - successful ! -> check return , ok or not.

And do mount with "1" parameter, = now. 

And WHAT you mount ? an empty string ??

see :

fresult = f_mount(&SDfs, (TCHAR const*)SDPath, 1);			// SD card mount NOW

Then only if fresult = ok , can do any open or read ; NOT write, until this working fine !!!