10 years, 4 months ago.

As far as I am aware only the two original mbeds (LPC1768 and LPC11u24) have the LocalFileSystem implemented.

The demand is really to put a file on it via usb mass storage? The only library I am aware of which could be used for that is: http://mbed.org/users/Sissors/code/USBFileSystem/.

Short summary: Implements a kinda like LocalFileSystem via the host microcontroller (instead of the interface microcontroller that the LocalFileSystem runs on). So you got to use the USB connector/pins of the LPC4088 itself, not the one used for programming (I assume they are also on the LPC4088 seperate ones). Aditionally the library requires you to still give it space to store stuff on, just like the USB MSD and the FATFileSystem libraries. This can be for example an SD card, but also a flash chip (they should be available on the LPC4088 Quickstart thing, but I don't know if there are already libraries to use.

An alternative is that I see it has EEPROM memory. You could also use that to store the files on. (You can also do it in a very limitted fashion on the program flash, but if you have EEPROM that should be superior). Due to the limitted storage space on the EEPROM you might need to hack it together a bit. The IAP library has EEPROM code for the LPC11u24, good chance it is at least similar for the LPC4088: http://mbed.org/users/okano/code/IAP/

Small warning: this will be quite some programming, if you aren't too familiar with it, an alternative solution might be better.

10 years, 4 months ago.

What Erik has written is correct. The LocalFileSystem can only be used with the "original" mbed boards. Boards with the new HDK doesn't have any local storage.

The LPC4088 also has an 8MB QSPI flash you can use for storage. In the EALib library we have a simple file system implementation (QSPIFileSystem)

Andreas @ Embedded Artists

#include "mbed.h"
#include "QSPIFileSystem.h"
 
QSPIFileSystem qspifs("/qspi/");
int main() {
    if (!qspifs.isFormatted()) {    //kb - s/b isformatted()
        qspifs.format();
    }
    
    FILE* fh = fopen("/qspi/hello.txt");  //kb - s/b fopen("/qspi/hello.txt", "w")
    if (fh != NULL) {
        fwrite("Hello World!", 12, 1, fh);
        fclose();                                       //kb - s/b fclose(fh);
    }
}

#include "mbed.h"
#include "QSPIFileSystem.h"
 
QSPIFileSystem qspi("qspi");
 
int main() {
    if (!qspifs.isFormatted()) {   //kb - same error as above
        qspifs.format();
    }
 
    FILE *fp = fopen("/qspi/myfile.txt", "w");
    if (fp != NULL) {
        fprintf(fp, "Hello World!\n");   //kb - fprintf is not a valid function
        fclose(fp);
    }
}

#include "mbed.h"
#include "QSPIFileSystem.h"

QSPIFileSystem qspifs("qspi");

static void cat(const char* fname)
{
    char buff[513];
    int num;
    
    FILE *fp = fopen(fname, "r");
    if (fp == NULL) {
        printf("Failed to open %s\n", fname);
        return;
    }
    
    printf("\n----- Content of %s -----\n", fname);
    while ((num = fread(buff, 1, 512, fp)) > 0)
    {
        buff[num] = '\0';
        printf(buff);
    }
    fclose(fp);
}
 
int main() {
    if (!qspifs.isformatted()) {
        qspifs.format();
    }

    FILE *fp = fopen("/qspi/myfile.txt", "a");
    if (fp != NULL) {
        fprintf(fp, "Hello World Again!\n");
        fclose(fp);
    }
    
    cat("/qspi/myfile.txt");
}

QSPIFileSystem qspifs("/qspi/");  //broken

QSPIFileSystem qspifs("qspi");  //works