How to convert hex two's complement to integer (e.g hex 810 to int -2032)

I would like to convert hex values which are defined in twos complement into int.For instance hex 810 convert in -2032. My first approach was to do it step by step. Convert to binary, Check msb for sign and then convert data accordingly. However I guess there might be a function available which can handle this issue easily??

Answer 1

[Walter Roberson]

Current versions can have hex constants

 0xF810s16

If you happen to have the hex as a variable

s = 'f810' 
typecast(uint16(sscanf(s, '%x')), 'int16') 

Using sscanf is not the fastest possible way for larger arrays, but typecast is faster than if statement checking the range. I posted a number of timing tests about 2 weeks ago in discussions with Robert.

[bernout breyer]

Thanks for fast response