Martin Heine

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10 years, 1 month ago.

USBMSD with SDFilesystem and FATFilesystem

I am trying to access a SD card via USB with the LPC11U24. When I use all the latest mbed official libraries SDFilesystem and FATFilesystem, I can't get beyond the compiler error message:

Error: Identifier "_is_initialized" is undefined in "USBMSD_SD/USBMSD_SD.h", Line: 58, Col: 40

Anybody any idea?

Thanks a lot!!!

Could you explain more what you did, and perhaps publish your code? USBMSD_SD does not use FATFileSystem/SDFileSystem. Also make sure all your libs are updated (click on them, and there is an update button).

posted by Erik - 03 Apr 2014

Here is the simple 'Hello World' SD example code I am trying to compile: All libs are updated! But still get:

Error: Identifier "_is_initialized" is undefined in "USBMSD_SD/USBMSD_SD.h", Line: 58, Col: 40

posted by Martin Heine 04 Apr 2014

USBMSD

#include "mbed.h"
#include "USBMSD_SD.h"
 
USBMSD_SD sd(p5, p6, p7, p8, "sd"); // the pinout on the LPC11U24
 
int main()
{ 
    printf("Hello World!\n");   
    mkdir("/sd/mydir", 0777);
    FILE *fp = fopen("/sd/mydir/sdtest.txt", "w");
    if(fp == NULL) {
        error("Could not open file for write\n");
    }
    fprintf(fp, "Hello fun SD Card World!");
    fclose(fp); 
 
    printf("Goodbye World!\n");
    while(1);
}
posted by Martin Heine 04 Apr 2014
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