개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

ppi(4)

PPI(4)                   BSD Kernel Interfaces Manual                   PPI(4)

NAME
     ppi — user-space interface to ppbus parallel 'geek' port

SYNOPSIS
     device ppi

     Minor numbering: unit numbers correspond directly to ppbus numbers.

     #include <dev/ppbus/ppi.h>
     #include <dev/ppbus/ppbconf.h>

DESCRIPTION
     The ppi driver provides a convenient means for user applications to
     manipulate the state of the parallel port, enabling easy low-speed I/O
     operations without the security problems inherent with the use of the
     /dev/io interface.

PROGRAMMING INTERFACE
     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);


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.

BSD                             January 2, 1998                            BSD