PPUI(9) NetBSD Kernel Manual PPUI(9)

NAME

ppui

user-space parallel port interface

SYNOPSIS

#include <sys/ioctl.h>
#include <dev/ppbus/ppui.h>
#include <dev/ppbus/ppbus_conf.h>

DESCRIPTION

All I/O on the ppui interface is performed using ioctl() calls. Each command takes a single u_int8_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;
	u_int8_t val;
	val = 0x5a;
	ioctl(fd, PPISDATA, &val);
	ioctl(fd, PPIGCTRL, &val);
	val |= STROBE;
	ioctl(fd, PPISCTRL, &val);
	val &= ~STROBE;
	ioctl(fd, PPISCTRL, &val);

FILES

None: see BUGS.

SEE ALSO

ioctl(2), atppc(4), io(4), ppbus(4), ppui(4)

HISTORY

ppui originally appeared in FreeBSD as ppi(4).

AUTHORS

This manual page is based on the FreeBSD ppi(4) manual page and was updated for NetBSD's 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 multiple operations together.
• ppui needs to be assigned a major device number manually. The device special file also needs to be created manually.

February 16, 2003