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82 lines
3.9 KiB
Text
82 lines
3.9 KiB
Text
Following information obtained from Tomi Engdahl (then@delta.hut.fi),
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http://www.hut.fi/~then/mytexts/mouse.html
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Microsoft serial mouse
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Serial data parameters:
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1200bps, 7 databits, 1 stop-bit
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Data packet format:
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Data packet is 3 byte packet. It is send to the computer every time mouse
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state changes (mouse moves or keys are pressed/released).
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D7 D6 D5 D4 D3 D2 D1 D0
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1. X 1 LB RB Y7 Y6 X7 X6
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2. X 0 X5 X4 X3 X2 X1 X0
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3. X 0 Y5 Y4 Y3 Y2 Y1 Y0
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Note: The bit marked with X is 0 if the mouse received with 7 databits
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and 2 stop bits format. It is also possible to use 8 databits and 1 stop
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bit format for receiving. In this case X gets value 1. The safest thing
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to get everything working is to use 7 databits and 1 stopbit when
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receiving mouse information (and if you are making mouse then send out
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7 databits and 2 stop bits).
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The byte marked with 1. is send first, then the others. The bit D6 in
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the first byte is used for syncronizing the software to mouse packets
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if it goes out of sync.
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LB is the state of the left button (1 means pressed down)
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RB is the state of the right button (1 means pressed down)
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X7-X0 movement in X direction since last packet (signed byte)
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Y7-Y0 movement in Y direction since last packet (signed byte)
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Mouse identification
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When DTR line is toggled, mouse should send one data byte containing
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letter 'M' (ascii 77).
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Logitech serial mouse
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Logitech uses the Microsoft serial mouse protocol in their mouses (for
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example Logitech Pilot mouse and others). The origianal protocol supports
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only two buttons, but logitech as added third button to some of their
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mouse models. To make this possible logitech has made one extension to
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the protocol.
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I have not seen any documentation about the exact documents, but here is
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what I have found out: The information of the third button state is sent
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using one extra byte which is send after the normal packet when needed.
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Value 32 (dec) is sent every time when the center button is pressed down.
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It is also sent every time with the data packet when center button is kept
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down and the mouse data packet is sent for other reasons. When center
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button is released, the mouse sends the normal data packet followed by
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data bythe which has value 0 (dec). As you can see the extra data byte
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is sent only when you mess with the center button.
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Mouse systems mouse
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Serial data parameters:
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1200bps, 8 databits, 1 stop-bit
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Data packet format:
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D7 D6 D5 D4 D3 D2 D1 D0
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1. 1 0 0 0 0 LB CB RB
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2. X7 X6 X5 X4 X3 X2 X1 X0
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3. Y7 Y6 Y5 Y4 Y3 Y4 Y1 Y0
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4. X7' X6' X5' X4' X3' X2' X1' X0'
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5. Y7' Y6' Y5' Y4' Y3' Y4' Y1' Y0'
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LB is left button state (0 = pressed, 1 = released)
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CB is center button state (0 = pressed, 1 = released)
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RB is right button state (0 = pressed, 1 = released)
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X7-X0 movement in X direction since last packet in signed byte
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format (-128..+127), positive direction right
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Y7-Y0 movement in Y direction since last packet in signed byte
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format (-128..+127), positive direction up
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X7'-X0' movement in X direction since sending of X7-X0 packet in
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signed byte format (-128..+127), positive direction right
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Y7'-Y0' movement in Y direction since sending of Y7-Y0 packet in
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signed byte format (-128..+127), positive direction up
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The last two bytes in the packet (bytes 4 and 5) contains information
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about movement data changes which have occured after data bytes 2 and 3
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have been sent.
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