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Shell equivalent of matlab fwrite function

 
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# 1  
Old 10-27-2015
Shell equivalent of matlab fwrite function
I have some matlab code that sends the serial port elements of an array using matlab's fwrite function, e.g.:
Code:
fwrite(s, [170 01 06 06 85], 'uchar');

What would be a unix shell equivalent? E.g., after successfully accessing the port using instructions here:

Simple terminal serial port program for Linux/MacOSX in C

this doesn't work to write to the port:
Code:
echo -e '107 01 06 06 85' > /dev/tty.PL2303-0000101D

Moderator's Comments:
Mod Comment edit by bakunin: corrected link description
Last edited by bakunin; 10-28-2015 at 12:21 PM..
# 2  
Old 10-27-2015
Are you attempting to write raw, binary characters to the serial port? You were writing the literal characters 1, 0, 7, ' ', 0, etc.

Code:
# Set serial port in raw mode, so binary passes unmangled
stty raw -F /dev/ttywhatever
# Convert decimal numbers into \xYY hexadecimal escape sequences
HEX="$(printf '\\x%02x' 107 01 06 06 85)"
# Convert escape sequences into raw binary, write to serial port
printf "$HEX" > /dev/ttywhatever

This User Gave Thanks to Corona688 For This Post:
darwin_886
# 3  
Old 10-29-2015
Perfect - thanks!
# 4  
Old 11-13-2015
Sorry - one other question. Although I can send the codes to port, it is very slow. I'm not sure why. I tried changing the baud rate but that didn't make any difference.

Not sure if this is relevant, but with the matlab serial function, I have the 'OutputBufferSize' argument set to 65535. Is there some equivalent argument for stty?
 
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