How can I convert a hexadecimal string from two's complement to a signed int?

Hello,

In a CCS code that i have produced, my data comes in two's complement, wich is stored as a hexadecimal number.

Than i send it to matlab by serial port, and it's read as a string (example: 'FFDF').

I know that FFDF is equal to -33, but how do i make that convertion in matlab?

Thank you,

Josué Jones

[Jan]

In opposite to some other binary/hex conversion questions in this forum, you provided an example value, which unequivocally defines, what you want. Therefore I've voted this question - and it is my personal question of the week!

Answer 1

[Jan]

Similar to Walter's method, but the builtin function hex2dec is slow, while sscanf converts hexadecimal values very fast:

typecast(uint16(sscanf('FFDF', '%x')), 'int16')

[Jonathon]

This was tremendously useful for converting my fixed-point coefficients from fixed-point matlab objects to standard integers. Exactly what I needed. Thanks so much!

[manoj hanu]

Is there a possibility of using the same on a complete column of 16bit Hex values in a table ?? DataType being 'cell array of character vectors'

[Walter Roberson]

typecast(uint16(cellfun(@(S) sscanf(S, '%x'), YourCell)), 'int16')

Answer 2

[Walter Roberson]

typecast( uint16( hex2dec(TheString) ), 'int16')

[Taha Zand]

Thank you.(دمت گرم. بوس بوس)