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9 years, 4 months ago.
LocalFileSystem
Hi,
i know there are many many posts on localfilesystem problems and how tos, but i did not find an answer...
system: mbed lpc1768
my problem: i wanted to read a file from the mbed space that shows up when connected via usb (where the .bin goes ant the mbed.htm is).
following code ends in error:
LocalFileSystem local("local"); printf("File Parsing:\r\n"); FILE *fp2 = fopen( "/local/registers.txt", "r"); printf("Loading file:\r\n"); if ( fp2 == NULL ) { error("Could not open file for read operation.\r\n"); }
so i tried to start at the beginning and implemented the example from the localfilesystem: localfilesystem example copied to compiler:
#include "mbed.h" LocalFileSystem local("local"); // Create the local filesystem under the name "local" int main() { FILE *fp = fopen("/local/out.txt", "w"); // Open "out.txt" on the local file system for writing fprintf(fp, "Hello World!"); fclose(fp); }
i am connected to the mbed via usb, i see the device and the bin but the out.txt never shows up.
i also tried another example:
LocalFileSystem local("local"); FILE *fp = fopen("/local/test.txt", "w"); fprintf(fp, "Hello file system!\n"); if ( fp == NULL ) { error("Could not open file for write operation.\r\n"); } fclose(fp);
which throwed no error but showed no file. after some restarts and refreshes i saw test.txt and TEST.TXT but neither file was accessibl. windows throwed an access error message. When i deleted it and loaded blinky demo with only led blinking the files always reappeared.
i flashed the newest firmware again to the mbed and now the files are gone but i still cannot read or write to files.
what am i missing?
1 Answer
9 years, 4 months ago.
Hi Jörn,
You are using long file name for reading file. It could be fine if you use "8.3" format file name. The name should be 8 characters or less and suffix should be 3 chars or less
If you try "registrs.txt" instead of "registers.txt", it will be fine ;)