DIPAK GARASIYA

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7 years, 5 months ago.

I cannot write to sd card means can't open file for writing

when i flash bin file to my MKL25Z128VLK4 following error show:

Hello World!
++ MbedOS Error Info ++
    Error Status: 0x80040103
    Error Code: 256
    Error Module: 255
    Error Message: FATAL  Run -time error
    Error Location: 0x74D3
    Error Value: 0x00005566
    Current Thread: Id: 0x200024A8 EntryFn: 0x0000FB0D StackSize: 0x00001000 StackMem: 0x200014A8 SP: 0x2002FFD8
    -- MbedOS Error Info --
Could not open file for write

i am using eclipse oxygen ide and writing to sd card with mbed-os

here i am inseted my code below:

#include "mbed.h"
#include "SDBlockDevice.h"
#include "FATFileSystem.h"
#include "stdio.h"
#define SD_MOUNT_PATH           "sd"

SDBlockDevice sd(PTD6, PTD7, PTD5, PTE31);
FATFileSystem fs(SD_MOUNT_PATH);

int main()
{
    sd.init();
    fs.mount(&sd);
    
    printf("Hello World!\n");

    FILE *fp = fopen("/sd/mydir/myfile.txt", "a");
    if (fp == NULL) {
        error("Could not open file for write\n");
        }
    fprintf(fp, "SD card is running successfully,Thank you");
    fclose(fp); 
 
    printf("Goodbye World!\n");

    fs.unmount();
    sd.deinit();
}

1 Answer

Karen Yen
7 years, 4 months ago.

Hello Dipak,

Can you try running this program here?:

https://github.com/ARMmbed/mbed-os-example-sd-driver

If you look at the mbed_lib.json file, it has the pins for SDBlockDevice(PinName mosi, PinName miso, PinName sclk, PinName cs) configured for the FRDM-KL25Z as:

        "KL25Z": {
             "SPI_MOSI": "PTD2",
             "SPI_MISO": "PTD3",
             "SPI_CLK":  "PTD1",
             "SPI_CS":   "PTD0"
        },

If you want, you can try changing those pin configurations within your own program to see if that will also run. Hope this helps!

-Karen, team Mbed

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