problem writting 2d arrays into SD card

[arunkumar1989]

Hey guys,

I am having some problem writing 2D arrays into SD card.

Please consider the following example:

[code]

int16 Ringbuf[5][2] = { {0,0}, {1,2}, {2,4}, {3,6},{4,8}};

FAT1_f_printf(&fs,"%d,",Ringbuf[0,0);     //random garbage is being written to file here.

[/code]

Any idea why this is happening?

I am using MK60MOVLQF15 CPU

Thanks,

Arun

[BlackNight]

Hi Arun,

I think I have not really used that printf() function.

printf() uses a lot of stack, make sure you have plenty stack space allocated.

Then, %d is for integer, probably 32bit on your microcontroller.

Use %hd instead (see printf - C++ Reference ).

Maybe this explains what is happening.

I hope this helps,

Erich

[arunkumar1989]

no luck so far ,single dimensional arrays are working correctly,my problem is with 2D arrays,the manual also has no examples with 2D examples are given,is there any way around this?

FatFs - f_printf

[BlackNight]

if the array is one or two (or more) dimensional, really should not matter.

Anway, what you have pasted will not compile anyway, I think you wanted to have this:

FAT1_f_printf(&fs,"%d,",Ringbuf[0][0]);     //random garbage is being written to file here.

The other thing to check: is your code warning-free?

Make sure you have included "Fat1.h" before using any function of it, especially functions with open argument lists.

Erich

[arunkumar1989]

The warning at that line is this:

Description    Resource    Path    Location    Type

left-hand operand of comma expression has no effect [-Wunused-value] passing argument 1 of 'f_printf' from incompatible pointer type [enabled by default]    sdcard.c    /sdcard_150_v2/Sources    line 55    C/C++ Problem

[BlackNight]

So is fs really of type FIL?

[arunkumar1989]

Yes sir it is.

I am attaching the .c file for your reference.

This is what i am getting in the file:

536805384,

[BlackNight · Accepted solution]

Change

FAT1_f_printf(&fs,"%d,",Ring[0,1]);

to

FAT1_f_printf(&fs,"%hd,",Ring[0][1]);

[arunkumar1989]

Yes ,a silly typo from me ,thanks that did the trick.

Thanks a lot.

AK