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.TH MOUSE 4 "13 agosto 2020" Linux "Manuale del programmatore di Linux"
.SH NOME
mouse \- interfaccia del mouse seriale
.SH CONFIGURAZIONE
I mouse seriali sono connessi a una linea seriale RS232/V24 dialout; si veda
\fBttyS\fP(4)  per la descrizione.
.SH DESCRIZIONE
.SS Introduzione
The pinout of the usual 9 pin plug as used for serial mice is:
.PP
.TS
center;
r c l.
pin	nome	usato per
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
Questa è la specifica; in effetti 9 V sono sufficienti per la maggior parte
dei mouse.
.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 (\(aqM\(aq) on the data
line.  After a further 63 ms, a Microsoft\-compatible 3\-button mouse will
send 0x33 (\(aq3\(aq).
.PP
The relative mouse movement is sent as \fIdx\fP (positive means right)  and
\fIdy\fP (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 "Protocollo Microsoft"
The \fBMicrosoft\fP 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 \fIdx\fP and \fIdy\fP movements are sent as two's\-complement, \fIlb\fP
(\fIrb\fP)  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 "Protocollo Microsoft per 3 tasti"
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 "Protocollo Logitech"
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 "Protocollo Mousesystems"
The \fBMousesystems\fP 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.  \fIdx\fP is sent as the sum of the two two's\-complement values, \fIdy\fP
is send as negated sum of the two two's\-complement values.  \fIlb\fP (\fImb\fP,
\fIrb\fP)  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 "Protocollo Sun"
The \fBSun\fP protocol is the 3\-byte version of the above 5\-byte Mousesystems
protocol: the last two bytes are not sent.
.SS "Protocollo MM"
The \fBMM\fP 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.
\fIdx\fP and \fIdy\fP are sent as single signed values, the sign bit indicating a
negative value.  \fIlb\fP (\fImb\fP, \fIrb\fP)  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 FILE
.TP 
\fI/dev/mouse\fP
Un collegamento simbolico comunemente usato che punta a un dispositivo di
mouse.
.SH "VEDERE ANCHE"
\fBttyS\fP(4), \fBgpm\fP(8)
.SH COLOPHON
Questa pagina fa parte del rilascio 5.10 del progetto Linux
\fIman\-pages\fP. Una descrizione del progetto, le istruzioni per la
segnalazione degli errori, e l'ultima versione di questa pagina si trovano
su \%https://www.kernel.org/doc/man\-pages/.

.SH TRADUZIONE
La traduzione italiana di questa pagina di manuale è stata creata da

.

Questa traduzione è documentazione libera; leggere la
.UR https://www.gnu.org/licenses/gpl-3.0.html
GNU General Public License Versione 3
.UE
o successiva per le condizioni di
copyright.
Non ci assumiamo alcuna responsabilità.

Per segnalare errori nella traduzione di questa pagina di
manuale inviare un messaggio a
.MT
pluto-ildp@lists.pluto.it
.ME .