ppi(9)
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PPI(9) NetBSD Kernel Developer's Manual PPI(9)
NAME
ppi -- user-space interface to ppbus parallel port
SYNOPSIS
#include <sys/ioctl.h>
#include <dev/ppbus/ppi.h>
#include <dev/ppbus/ppbus_conf.h>
DESCRIPTION
All I/O on the ppi interface is performed using ioctl() calls. Each com-
mand takes a single uint8_t argument, transferring one byte of data. The
following commands are available:
PPIGDATA, PPISDATA
Get and set the contents of the data register.
PPIGSTATUS, PPISSTATUS
Get and set the contents of the status register.
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.
STROBE
AUTOFEED
nINIT
SELECTIN
PCD
PPIGEPP, PPISEPP
Get and set the contents of the EPP control register.
PPIGECR, PPISECR
Get and set the contents of the ECP control register.
PPIGFIFO, PPISFIFO
Read and write the ECP FIFO (8-bit operations only).
EXAMPLES
To present the value 0x5a to the data port, drive STROBE low and then
high again, the following code fragment can be used:
int fd;
uint8_t val;
val = 0x5a;
ioctl(fd, PPISDATA, &val);
ioctl(fd, PPIGCTRL, &val);
val |= STROBE;
ioctl(fd, PPISCTRL, &val);
val &= ~STROBE;
ioctl(fd, PPISCTRL, &val);
SEE ALSO
ioctl(2), atppc(4), io(4), ppbus(4), ppi(4)
HISTORY
ppi originally appeared in FreeBSD.
AUTHORS
This manual page is based on the FreeBSD ppi manual page and was updated
for the NetBSD port by Gary Thorpe.
BUGS
The inverse sense of signals is confusing.
The ioctl() interface is slow, and there is no way (yet) to chain multi-
ple operations together.
The headers required for user applications are not installed as part of
the standard system.
NetBSD 7.1.1 December 29, 2003 NetBSD 7.1.1
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