Work of doesn´t of reading binary file on MCB2400 in LV2009 ARM embedded

Hello

I try to read a binary file from SD card on my MCB2400 with LV2009 Board built for the ARMS.

But the result is always 0, if I use my VI on the MCB2400. If use the same VI on the PC, it works very well with the binary file.

The
access to the SD card on the works of MCB2400 in the other end, if I
try to read a text file - it works without any problem.

Y thre constraints for "reading a binary file" - node in Embedded in comparison to the same node on PC?

I noticed that there is also a problem
with the reading of the textfiles. If the sice of the file is approximately 100 bytes
It doesn´t works, too. I understand can´t, because I read
always one byte. And even if the implementation in Labview is so
bad that it reads the total allways of the file in ram it sould work. The
MCB2400 has 32 MB of RAM, so 100 bytes or even a few megabytes should
work.

But this doesn´t seems to be the problem for binary-problem. Because even a work of 50 bytes binary file doesn´t.

Bye & thanks

Amin

I know that you have already solved this problem with a workaround, but I did some digging around in the source code to find the source of the problem and found the following:

Currently, binary read/write primitives do not support the entry of "byte order".  Thus, you should always let this entry by default (or 0), which will use the native boutien of the target (or little endian for the target ARM).  If wire you one value other than the default, the primitive will be returns an error and does not perform a read/write.

So, theoretically... If you return to the VI very original as your shift and delete the entry "byte order" on the binary file read, he must run a binary read little endian.

This also brings up another point:

If a primitive type is not what you expect, check the error output.

Tags: NI Products

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