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diff --git a/man4/mouse.4 b/man4/mouse.4 new file mode 100644 index 0000000..69278a0 --- /dev/null +++ b/man4/mouse.4 @@ -0,0 +1,171 @@ +'\" t +.\" This manpage is Copyright (C) 1996 Michael Haardt. +.\" Updates Nov 1998, Andries Brouwer +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.TH mouse 4 2023-02-05 "Linux man-pages 6.05.01" +.SH NAME +mouse \- serial mouse interface +.SH CONFIGURATION +Serial mice are connected to a serial RS232/V24 dialout line, see +.BR ttyS (4) +for a description. +.SH DESCRIPTION +.SS Introduction +The pinout of the usual 9 pin plug as used for serial mice is: +.PP +.TS +center; +r c l. +pin name used for +2 RX Data +3 TX \-12 V, Imax = 10 mA +4 DTR +12 V, Imax = 10 mA +7 RTS +12 V, Imax = 10 mA +5 GND Ground +.TE +.PP +This is the specification, in fact 9 V suffices with most mice. +.PP +The mouse driver can recognize a mouse by dropping RTS to low and raising +it again. +About 14 ms later the mouse will send 0x4D (\[aq]M\[aq]) on the data line. +After a further 63 ms, a Microsoft-compatible 3-button mouse will send +0x33 (\[aq]3\[aq]). +.PP +The relative mouse movement is sent as +.I dx +(positive means right) +and +.I dy +(positive means down). +Various mice can operate at different speeds. +To select speeds, cycle through the +speeds 9600, 4800, 2400, and 1200 bit/s, each time writing the two characters +from the table below and waiting 0.1 seconds. +The following table shows available speeds and the strings that select them: +.PP +.TS +center; +l l. +bit/s string +9600 *q +4800 *p +2400 *o +1200 *n +.TE +.PP +The first byte of a data packet can be used for synchronization purposes. +.SS Microsoft protocol +The +.B Microsoft +protocol uses 1 start bit, 7 data bits, no parity +and one stop bit at the speed of 1200 bits/sec. +Data is sent to RxD in 3-byte packets. +The +.I dx +and +.I dy +movements are sent as +two's-complement, +.I lb +.RI ( rb ) +are set when the left (right) +button is pressed: +.PP +.TS +center; +r c c c c c c c. +byte d6 d5 d4 d3 d2 d1 d0 +1 1 lb rb dy7 dy6 dx7 dx6 +2 0 dx5 dx4 dx3 dx2 dx1 dx0 +3 0 dy5 dy4 dy3 dy2 dy1 dy0 +.TE +.SS 3-button Microsoft protocol +Original Microsoft mice only have two buttons. +However, there are some +three button mice which also use the Microsoft protocol. +Pressing or +releasing the middle button is reported by sending a packet with zero +movement and no buttons pressed. +(Thus, unlike for the other two buttons, the status of the middle +button is not reported in each packet.) +.SS Logitech protocol +Logitech serial 3-button mice use a different extension of the +Microsoft protocol: when the middle button is up, the above 3-byte +packet is sent. +When the middle button is down a 4-byte packet is +sent, where the 4th byte has value 0x20 (or at least has the 0x20 +bit set). +In particular, a press of the middle button is reported +as 0,0,0,0x20 when no other buttons are down. +.SS Mousesystems protocol +The +.B Mousesystems +protocol uses 1 start bit, 8 data bits, no parity, +and two stop bits at the speed of 1200 bits/sec. +Data is sent to RxD in +5-byte packets. +.I dx +is sent as the sum of the two two's-complement +values, +.I dy +is send as negated sum of the two two's-complement +values. +.I lb +.RI ( mb , +.IR rb ) +are cleared when the left (middle, +right) button is pressed: +.PP +.TS +center; +r c c c c c c c c. +byte d7 d6 d5 d4 d3 d2 d1 d0 +1 1 0 0 0 0 lb mb rb +2 0 dxa6 dxa5 dxa4 dxa3 dxa2 dxa1 dxa0 +3 0 dya6 dya5 dya4 dya3 dya2 dya1 dya0 +4 0 dxb6 dxb5 dxb4 dxb3 dxb2 dxb1 dxb0 +5 0 dyb6 dyb5 dyb4 dyb3 dyb2 dyb1 dyb0 +.TE +.PP +Bytes 4 and 5 describe the change that occurred since bytes 2 and 3 +were transmitted. +.SS Sun protocol +The +.B Sun +protocol is the 3-byte version of the above 5-byte +Mousesystems protocol: the last two bytes are not sent. +.SS MM protocol +The +.B MM +protocol uses 1 start bit, 8 data bits, odd parity, and one +stop bit at the speed of 1200 bits/sec. +Data is sent to RxD in 3-byte +packets. +.I dx +and +.I dy +are sent as single signed values, the +sign bit indicating a negative value. +.I lb +.RI ( mb , +.IR rb ) +are +set when the left (middle, right) button is pressed: +.PP +.TS +center; +r c c c c c c c c. +byte d7 d6 d5 d4 d3 d2 d1 d0 +1 1 0 0 dxs dys lb mb rb +2 0 dx6 dx5 dx4 dx3 dx2 dx1 dx0 +3 0 dy6 dy5 dy4 dy3 dy2 dy1 dy0 +.TE +.SH FILES +.TP +.I /dev/mouse +A commonly used symbolic link pointing to a mouse device. +.SH SEE ALSO +.BR ttyS (4), +.BR gpm (8) |