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Conversion of ascii and hex

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Loheswari
Loheswari 2011-5-13
I hav hex data that to be sent through rs232 as ascii. In the same way, received ascii data in rs232 has to be converted into hex. But in matlab,no hex to ascii and ascii to hex conversion is available. Pls help me to do so......

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回答（4 个）

Mark Shore
Mark Shore 2011-5-13
dec2hex(uint8('a'))
char(hex2dec('61'))
Also consult the documentation on character arrays.
Jan
Jan 2011-5-13
Much faster than HEX2DEC:
sscanf('61', '%x') % 97
sscanf('abcd', '%x') % 43981
sscanf('abcd', '%2x') % [171;205]
And if you recieve the values from the serial port, FSCANF can convert from HEX directly.
EDITED: (Consider Walter's and my comments) For a direct conversion of the ASCII character to a HEX number and backwards:
sprintf('%x', 'M'); % '4d'
char(sscanf('%x', '4d')); % 'M'
Works with FPRINTF directly also.
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Mark Shore
Mark Shore 2011-5-14
Those work nicely. For longer ascii strings you'd have to break up the multicharacter hex string into two character increments to go back to ascii, but that shouldn't be much of a problem.
It's a little odd that there's no direct conversion available and that all of the suggestions so far have been workarounds.
Walter Roberson
Walter Roberson 2011-5-14
Mark, a minor variation on my earlier solution solves the break-up issue:
char(sscanf(String,'%2X').')
The original poster has not been back to clarify what they were looking for, so I would hesitate to say the suggestions are "workarounds".

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Titus Edelhofer
Titus Edelhofer 2011-5-13
Hi,
what about dec2hex and hex2dec/hex2num?
Titus
Walter Roberson
Walter Roberson 2011-5-13
How is your hex data represented? If it is a vector of numbers each of which has an integer value 0 to 15, then
fprintf(s,'%X', YourVector)
and you would read it with
fscanf(s,'%1X')
Or, more likely,
sscanf(fgetl(s),'%1X')
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Walter Roberson
Walter Roberson 2011-5-15
If you are working with a string that is an even number of bytes, you could use
char(hex2dec(reshape(String,2,[]).').')
I would expect, though, that char(sscanf(String,'%2X').') would be faster.

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