This isn't exactly what you want, but it might have some useful code snippets.
A recent CTF contained a challenge for finding a secret key in a USB capture of mouse activity. In the following writeup, skip past the USB stuff and check out the totally hackish awk script that performs two's compliment, summing and click detection to produce a list of click coordinates relative to the starting mouse position. Next is a simple gnuplot command to visualize all of the clicks at once. https://github.com/ctfs/write-ups-2015/tree/master/boston-key-party-2015/school-bus/riverside -- Kenny -+---+++-++-++++--+------+-+-++--++--+-+-++--+++-++----+-++-+++---+----+--+----+ On Tue, 2015-04-07 at 13:07 -0700, Nathan McCorkle wrote: > Hey everyone, > I finally got back to my RS232-sniffer project... found that I swapped > the tx and rx lines on the USART (Serial3 in arduino-mega-land) and > left out the power decoupling caps. > > After some rework (http://imgur.com/ZxrTJ5V) and headbanging I > realized I forgot to flip the GPIO pins that were attached to ONLINE > and SHUTDOWN lines on the RS232-to-TTL converter chips and things seem > to be working as far as getting data from Python to the Arduino and > back again. > > So next was to try and get the serial mouse protocol working... I > found this page which seemed good enough to start: > http://paulbourke.net/dataformats/serialmouse/ > > I wrote some Python code to take in the X and Y movement amounts, and > two booleans for the mouse buttons, then do some binary masking, > shifting, etc to get the 3 bytes needed. > > The protocol says "7 bit, 1 stop bit, no parity", and when I get the > byte in Arduino and println(inByte, BIN) I see the 7 bits expected, > but when I send that byte back out of the USART, I get the last bit as > being a 1... now since I know this should only be 7 bits not 8, I > figure that's just a library glitch/anomalie (making the unused bit a > 1 instead of a 0). > > The real issue now is, how the heck do I test a serial mouse in this > day and age? The Ubuntu wiki page lists some methods, but the top-most > one required restarting which seems unnecessary... and didn't work > anyway (though now I realize I had the baud set on 9600 but that mouse > page says it should be 1200). > > TLDR; > Does anyone know of a better way to test/use a serial-mouse... or at > least print out the decoded data (with a program that I didn't write!) > by attaching to a serial-port (/dev/ttyUSB3 is where the USB to serial > converter is showing up as... this is secondary to the Arduino's USB > to Serial, which is showing up on /dev/ACM0) >
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