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wiz 2004-01-23 19:50:43 +00:00
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36
share/man/man9/ppi.9
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@ -1,3 +1,5 @@
.\" $NetBSD: ppi.9,v 1.3 2004/01/23 19:50:43 wiz Exp $
.\"
.\" Copyright (c) 1997
.\" Michael Smith
.\"
@ -36,15 +38,15 @@
.In dev/ppbus/ppi.h
.In dev/ppbus/ppbus_conf.h
.Sh DESCRIPTION
.Pp
All I/O on the
.Nm
interface is performed using
.Fn ioctl
calls. Each command takes a single
calls.
Each command takes a single
.Ft u_int8_t
argument, transferring one byte of data. The following commands are
available:
argument, transferring one byte of data.
The following commands are available:
.Bl -tag -width indent
.It Dv PPIGDATA , PPISDATA
Get and set the contents of the data register.
@ -52,8 +54,9 @@ Get and set the contents of the data register.
Get and set the contents of the status register.
.It Dv PPIGCTRL , PPISCTRL
Get and set the contents of the control register.
The following defines correspond to bits in this register. Setting
a bit in the control register drives the corresponding output low.
The following defines correspond to bits in this register.
Setting a bit in the control register drives the corresponding
output low.
.Bl -tag -width indent -compact
.It Dv STROBE
.It Dv AUTOFEED
@ -69,20 +72,19 @@ Get and set the contents of the ECP control register.
Read and write the ECP FIFO (8-bit operations only).
.El
.Sh EXAMPLES
To present the value 0x5a to the data port, drive STROBE low and then high
again, the following code fragment can be used:
To present the value 0x5a to the data port, drive STROBE low and
then high again, the following code fragment can be used:
.Bd -literal -compact
int fd;
u_int8_t val;
val = 0x5a;
ioctl(fd, PPISDATA, &val);
ioctl(fd, PPIGCTRL, &val);
ioctl(fd, PPISDATA, \*[Am]val);
ioctl(fd, PPIGCTRL, \*[Am]val);
val |= STROBE;
ioctl(fd, PPISCTRL, &val);
val &= ~STROBE;
ioctl(fd, PPISCTRL, &val);
ioctl(fd, PPISCTRL, \*[Am]val);
val \*[Am]= ~STROBE;
ioctl(fd, PPISCTRL, \*[Am]val);
.Ed
.Sh SEE ALSO
@ -98,8 +100,10 @@ originally appeared in
.Sh AUTHORS
This manual page is based on the
.Fx
.Xr ppi 4
manual page and was updated for NetBSD's port by
.Nm ppi
manual page and was updated for the
.Nx
port by
.An Gary Thorpe .
.Sh BUGS
The inverse sense of signals is confusing.