Convert binary file from hex little endian to decimal

Hi- my first post so go easy.

I get data from a sensor via a RockBlock Iridium Modem. The data come in 50 byte messages. I get an email with the data in Hex (little endian) - here is an example

85cd0a0084a7f6ff884027000b27e5cc0a0031a6f6ff885026000d427acc0a0096a4f6ff886026000c322900605a0002003c

I also get a binary file with the data.

I would like to read the binary file and decode it in matlab. I tried to attach my binary data file but it was not a supported file format so I've included a link to it here

For example, the first 8 bytes correspond to the latitude. I need to convert from little endian to big endian and then to decimal.

[dpb]

"I tried to attach my binary data file but it was not a supported file format..."

What possessed TMW to do this for a programming forum is beyond comprehension...but you can get around it by simply renaming the file to use an allowed extension; it looks only at the file name, not the content.

What's the corresponding result for the above?

There's 100 characters in the above; that isn't divisible by 8. I presume that's just artifact of how much you pasted in and there are 12*8=96 "real" values plus 4 bytes from subsequent?

[Daniel Carlson]

What I pasted is the entire data string. The first 8 bytes are lat, the next 8 bytes are lon, next 4 bytes are time, next 4 bytes are water temp and so on. The total number is 100. I just listed the first 8 bytes as an example.

I changed the file extension, as you suggested so the data should be attached

[Stephen23]

@Daniel Carlson : changing the file extension to .txt is preferred, not everyone wishes to download binary files with MS Office (i.e. trojan and virus-carrying) file extensions, which can trigger all sorts of responses from the OS, virus blockers, etc.

[dpb]

"changing the file extension to .txt is preferred, not everyone wishes to download binary files "

OK, so choose to download or not or have the same content with (purposely) misleading name? It's not like coders don't write stream files as the case here...

Answer 1

[Daniel Carlson]

So, I think I figured it out.

fname = '300434063383360-608.bin';

fid = fopen(fname);

A = fread(fid);

H = lower(dec2hex(A));

hxstr = [];

for i = 1:length(H)

hxstr = [hxstr H(i,:)];

end

fclose(fid);

Answer 2

[Steven Lord]

The fopen function allows you to specify a machine format when you open the file for reading. Then you can read the data in using the low-level file I/O functions.

If you've already read your data into MATLAB, the swapbytes, typecast, and hex2dec functions may be of use to you.

[Daniel Carlson]

Yes, familiar with fopen, but not getting the results that I need. I have this excel worksheet, but having trouble replicating it in Matlab.