Communications Protocols from J.E. Davis posted by Peter Tiang
Serial UART: 1200 baud, data=8,start=1,parity=none
Mouse Protocol of Transmission
bit: 7 6 5 4 3 2 1 0
byte 1 (sync) 1 0 0 0 0 L M R (0=depressed button)
byte 2 (dX) x7 x6 x5 x4 x3 x2 x1 x0 (bit 7 -> 0=pos,1=neg)
byte 3 (dY) y7 y6 y5 y4 y3 y2 y1 y0
byte 4 (dX') x7 x6 x5 x4 x3 x2 x1 x0
byte 5 (dY') y7 y6 y5 y4 y3 y2 y1 y0
Notes: - all bytes are two's complement binary
- dX, dY = relative moves after last transmission
- dX',dY' = relative moves since dX, dY were transmitted
Serial UART: 1200 baud, data=7,stop=1,parity=none
Mouse Protocol of Transmission (normal mode)
bit: 7 6 5 4 3 2 1 0
byte 1 (sync) 0 1 L R y7 y6 x7 x6 (1=depressed button)
byte 2 (dX) 0 0 x5 x4 x3 x2 x1 x0 (MSB-> 0=pos,1=neg)
byte 3 (dY) 0 0 y5 y4 y3 y2 y1 y0
Notes: - all moves bytes are two's complement binary
(you must collect all bits together)
See also: