File doesn't appear in explorer

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File doesn't appear in explorer

Topic last updated 11 Dec 2018, by Phillipp Steiner. 2 replies

# 09 Apr 2018

Hello, I have a program for my LP1768 wich write in a file:

LocalFileSystem    local("local");
int main() {
  FILE                *fp;
  fp = fopen("/local/data.dat", "w+");
.........
  fprintf(fp,"AXE1 x=%d y=%d z=%d\n\r",MMA1.x,MMA1.y,MMA1.z); //
   fclose(fp);
}

My problem is that this file (data.dat) is invisible in my files explorer under W10, I can see the MBED drive but my file is not visible. Thanks for your help

Michel

Phillipp Steiner

# 21 Apr 2018

Hi,

the MBED drive you see in windows 10 is from the debugger and not from the µC and you can't write a file from the µC to the debuggers drive. The MBED drive from the debugger is only there to flash the µC. If you want to play with files use a SD-Card, external Flash or an EEPROM.

From https://os.mbed.com/platforms/mbed-LPC1768/:

Quote:

The mbed NXP LPC1768 is one of a range of mbed Microcontrollers packaged as a small 40-pin DIP, 0.1-inch pitch form-factor making it convenient for prototyping with solderless breadboard, stripboard, and through-hole PCBs. It includes a built-in USB programming interface that is as simple as using a USB Flash Drive. Plug it in, drop on an ARM program binary, and its up and running!

BTW: if you want to write on a file system you need to mount the drive in your code. Search for examples i.e. Mbed-Bootloader. I hope this helps!

Philipp

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