594 lines
13 KiB
C
594 lines
13 KiB
C
/*
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* gpio.c:
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* Set-UID command-line interface to the Raspberry Pi's GPIO
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* Copyright (c) 2012 Gordon Henderson
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***********************************************************************
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* This file is part of wiringPi:
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* https://projects.drogon.net/raspberry-pi/wiringpi/
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*
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* wiringPi is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* wiringPi is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
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***********************************************************************
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*/
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#include <wiringPi.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#define VERSION "1.0"
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static int wpMode ;
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char *usage = "Usage: gpio -v\n"
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" gpio [-g] <read/write/pwm/mode> ...\n"
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" gpio [-p] <read/write/mode> ...\n"
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" gpio <export/edge/unexport/unexportall/exports> ..." ;
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/*
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* doExports:
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* List all GPIO exports
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*********************************************************************************
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*/
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void doExports (void)
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{
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int fd ;
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int i, l, first ;
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char fName [128] ;
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char buf [16] ;
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// Rather crude, but who knows what others are up to...
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for (first = 0, i = 0 ; i < 64 ; ++i)
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{
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// Try to read the direction
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sprintf (fName, "/sys/class/gpio/gpio%d/direction", i) ;
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if ((fd = open (fName, O_RDONLY)) == -1)
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continue ;
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if (first == 0)
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{
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++first ;
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printf ("GPIO Pins exported:\n") ;
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}
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printf ("%4d: ", i) ;
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if ((l = read (fd, buf, 16)) == 0)
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sprintf (buf, "%s", "?") ;
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buf [l] = 0 ;
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if ((buf [strlen (buf) - 1]) == '\n')
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buf [strlen (buf) - 1] = 0 ;
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printf ("%-3s", buf) ;
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close (fd) ;
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// Try to Read the value
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sprintf (fName, "/sys/class/gpio/gpio%d/value", i) ;
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if ((fd = open (fName, O_RDONLY)) == -1)
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{
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printf ("No Value file (huh?)\n") ;
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continue ;
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}
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if ((l = read (fd, buf, 16)) == 0)
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sprintf (buf, "%s", "?") ;
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buf [l] = 0 ;
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if ((buf [strlen (buf) - 1]) == '\n')
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buf [strlen (buf) - 1] = 0 ;
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printf (" %s", buf) ;
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// Read any edge trigger file
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sprintf (fName, "/sys/class/gpio/gpio%d/edge", i) ;
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if ((fd = open (fName, O_RDONLY)) == -1)
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{
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printf ("\n") ;
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continue ;
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}
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if ((l = read (fd, buf, 16)) == 0)
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sprintf (buf, "%s", "?") ;
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buf [l] = 0 ;
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if ((buf [strlen (buf) - 1]) == '\n')
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buf [strlen (buf) - 1] = 0 ;
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printf (" %-8s\n", buf) ;
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close (fd) ;
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}
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}
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/*
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* doExport:
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* gpio export pin mode
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* This uses the /sys/class/gpio device interface.
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*********************************************************************************
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*/
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void doExport (int argc, char *argv [])
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{
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FILE *fd ;
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int pin ;
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char *mode ;
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char fName [128] ;
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uid_t uid ;
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gid_t gid ;
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if (argc != 4)
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{
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fprintf (stderr, "Usage: %s export pin mode\n", argv [0]) ;
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exit (1) ;
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}
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pin = atoi (argv [2]) ;
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mode = argv [3] ;
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if ((fd = fopen ("/sys/class/gpio/export", "w")) == NULL)
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{
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fprintf (stderr, "%s: Unable to open GPIO export interface: %s\n", argv [0], strerror (errno)) ;
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exit (1) ;
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}
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fprintf (fd, "%d\n", pin) ;
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fclose (fd) ;
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sprintf (fName, "/sys/class/gpio/gpio%d/direction", pin) ;
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if ((fd = fopen (fName, "w")) == NULL)
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{
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fprintf (stderr, "%s: Unable to open GPIO direction interface for pin %d: %s\n", argv [0], pin, strerror (errno)) ;
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exit (1) ;
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}
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/**/ if ((strcasecmp (mode, "in") == 0) || (strcasecmp (mode, "input") == 0))
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fprintf (fd, "in\n") ;
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else if ((strcasecmp (mode, "out") == 0) || (strcasecmp (mode, "output") == 0))
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fprintf (fd, "out\n") ;
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else
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{
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fprintf (stderr, "%s: Invalid mode: %s. Should be in or out\n", argv [1], mode) ;
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exit (1) ;
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}
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fclose (fd) ;
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// Change ownership so the current user can actually use it!
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uid = getuid () ;
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gid = getgid () ;
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sprintf (fName, "/sys/class/gpio/gpio%d/value", pin) ;
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if (chown (fName, uid, gid) != 0)
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{
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fprintf (stderr, "%s: Unable to change ownership of the value file: %s\n", argv [1], strerror (errno)) ;
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exit (1) ;
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}
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// Also change ownership of the edge file - if it exists
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sprintf (fName, "/sys/class/gpio/gpio%d/edge", pin) ;
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if (chown (fName, uid, gid) != 0)
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{
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if (errno != ENOENT) // Silently ignore File not found - older kernel
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{
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fprintf (stderr, "%s: Unable to change ownership of the value file: %s\n", argv [1], strerror (errno)) ;
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exit (1) ;
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}
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}
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}
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/*
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* doEdge:
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* gpio edge pin mode
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* Easy access to changing the edge trigger on a GPIO pin
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* This uses the /sys/class/gpio device interface.
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*********************************************************************************
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*/
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void doEdge (int argc, char *argv [])
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{
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FILE *fd ;
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int pin ;
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char *mode ;
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char fName [128] ;
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uid_t uid ;
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gid_t gid ;
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if (argc != 4)
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{
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fprintf (stderr, "Usage: %s edge pin mode\n", argv [0]) ;
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exit (1) ;
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}
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pin = atoi (argv [2]) ;
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mode = argv [3] ;
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// Export the pin and set direction to input
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if ((fd = fopen ("/sys/class/gpio/export", "w")) == NULL)
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{
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fprintf (stderr, "%s: Unable to open GPIO export interface: %s\n", argv [0], strerror (errno)) ;
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exit (1) ;
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}
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fprintf (fd, "%d\n", pin) ;
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fclose (fd) ;
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sprintf (fName, "/sys/class/gpio/gpio%d/direction", pin) ;
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if ((fd = fopen (fName, "w")) == NULL)
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{
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fprintf (stderr, "%s: Unable to open GPIO direction interface for pin %d: %s\n", argv [0], pin, strerror (errno)) ;
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exit (1) ;
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}
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fprintf (fd, "in\n") ;
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fclose (fd) ;
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sprintf (fName, "/sys/class/gpio/gpio%d/edge", pin) ;
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if ((fd = fopen (fName, "w")) == NULL)
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{
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fprintf (stderr, "%s: Unable to open GPIO edge interface for pin %d: %s\n", argv [0], pin, strerror (errno)) ;
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exit (1) ;
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}
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/**/ if (strcasecmp (mode, "none") == 0)
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fprintf (fd, "none\n") ;
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else if (strcasecmp (mode, "rising") == 0)
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fprintf (fd, "rising\n") ;
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else if (strcasecmp (mode, "falling") == 0)
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fprintf (fd, "falling\n") ;
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else if (strcasecmp (mode, "both") == 0)
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fprintf (fd, "both\n") ;
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else
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{
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fprintf (stderr, "%s: Invalid mode: %s. Should be none, rising, falling or both\n", argv [1], mode) ;
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exit (1) ;
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}
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// Change ownership so the current user can actually use it!
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uid = getuid () ;
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gid = getgid () ;
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sprintf (fName, "/sys/class/gpio/gpio%d/value", pin) ;
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if (chown (fName, uid, gid) != 0)
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{
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fprintf (stderr, "%s: Unable to change ownership of the value file: %s\n", argv [1], strerror (errno)) ;
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exit (1) ;
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}
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// Also change ownership of the edge file
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sprintf (fName, "/sys/class/gpio/gpio%d/edge", pin) ;
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if (chown (fName, uid, gid) != 0)
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{
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fprintf (stderr, "%s: Unable to change ownership of the value file: %s\n", argv [1], strerror (errno)) ;
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exit (1) ;
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}
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fclose (fd) ;
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}
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/*
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* doUnexport:
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* gpio unexport pin
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* This uses the /sys/class/gpio device interface.
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*********************************************************************************
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*/
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void doUnexport (int argc, char *argv [])
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{
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FILE *fd ;
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int pin ;
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if (argc != 3)
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{
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fprintf (stderr, "Usage: %s unexport pin\n", argv [0]) ;
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exit (1) ;
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}
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pin = atoi (argv [2]) ;
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if ((fd = fopen ("/sys/class/gpio/unexport", "w")) == NULL)
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{
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fprintf (stderr, "%s: Unable to open GPIO export interface\n", argv [0]) ;
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exit (1) ;
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}
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fprintf (fd, "%d\n", pin) ;
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fclose (fd) ;
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}
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/*
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* doUnexportAll:
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* gpio unexportall
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* Un-Export all the GPIO pins.
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* This uses the /sys/class/gpio device interface.
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*********************************************************************************
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*/
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void doUnexportall (int argc, char *argv [])
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{
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FILE *fd ;
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int pin ;
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for (pin = 0 ; pin < 63 ; ++pin)
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{
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if ((fd = fopen ("/sys/class/gpio/unexport", "w")) == NULL)
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{
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fprintf (stderr, "%s: Unable to open GPIO export interface\n", argv [0]) ;
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exit (1) ;
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}
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fprintf (fd, "%d\n", pin) ;
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fclose (fd) ;
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}
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}
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/*
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* doMode:
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* gpio mode pin mode ...
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*********************************************************************************
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*/
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void doMode (int argc, char *argv [])
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{
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int pin ;
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char *mode ;
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if (argc != 4)
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{
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fprintf (stderr, "Usage: %s mode pin mode\n", argv [0]) ;
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exit (1) ;
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}
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pin = atoi (argv [2]) ;
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if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
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return ;
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mode = argv [3] ;
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/**/ if (strcasecmp (mode, "in") == 0)
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pinMode (pin, INPUT) ;
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else if (strcasecmp (mode, "out") == 0)
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pinMode (pin, OUTPUT) ;
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else if (strcasecmp (mode, "pwm") == 0)
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pinMode (pin, PWM_OUTPUT) ;
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else if (strcasecmp (mode, "up") == 0)
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pullUpDnControl (pin, PUD_UP) ;
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else if (strcasecmp (mode, "down") == 0)
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pullUpDnControl (pin, PUD_DOWN) ;
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else if (strcasecmp (mode, "tri") == 0)
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pullUpDnControl (pin, PUD_OFF) ;
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else
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{
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fprintf (stderr, "%s: Invalid mode: %s. Should be in/out/pwm/up/down/tri\n", argv [1], mode) ;
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exit (1) ;
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}
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}
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/*
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* doWrite:
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* gpio write pin value
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*********************************************************************************
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*/
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void doWrite (int argc, char *argv [])
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{
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int pin, val ;
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if (argc != 4)
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{
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fprintf (stderr, "Usage: %s write pin value\n", argv [0]) ;
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exit (1) ;
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}
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pin = atoi (argv [2]) ;
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if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
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return ;
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val = atoi (argv [3]) ;
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/**/ if (val == 0)
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digitalWrite (pin, LOW) ;
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else
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digitalWrite (pin, HIGH) ;
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}
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/*
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* doRead:
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* Read a pin and return the value
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*********************************************************************************
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*/
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void doRead (int argc, char *argv [])
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{
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int pin, val ;
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if (argc != 3)
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{
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fprintf (stderr, "Usage: %s read pin\n", argv [0]) ;
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exit (1) ;
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}
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pin = atoi (argv [2]) ;
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if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
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{
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printf ("0\n") ;
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return ;
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}
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val = digitalRead (pin) ;
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printf ("%s\n", val == 0 ? "0" : "1") ;
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}
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/*
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* doPwm:
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* Output a PWM value on a pin
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*********************************************************************************
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*/
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void doPwm (int argc, char *argv [])
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{
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int pin, val ;
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if (argc != 4)
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{
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fprintf (stderr, "Usage: %s pwm <pin> <value>\n", argv [0]) ;
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exit (1) ;
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}
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pin = atoi (argv [2]) ;
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if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
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return ;
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val = atoi (argv [3]) ;
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pwmWrite (pin, val) ;
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}
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/*
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* main:
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* Start here
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*********************************************************************************
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*/
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int main (int argc, char *argv [])
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{
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int i ;
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if (argc == 1)
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{
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fprintf (stderr, "%s: %s\n", argv [0], usage) ;
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return 1 ;
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}
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if (geteuid () != 0)
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{
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fprintf (stderr, "%s: Must be root to run\n", argv [0]) ;
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return 1 ;
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}
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if (strcasecmp (argv [1], "-v") == 0)
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{
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printf ("gpio version: %s\n", VERSION) ;
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printf ("Copyright (c) 2012 Gordon Henderson\n") ;
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printf ("This is free software with ABSOLUTELY NO WARRANTY.\n") ;
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return 0 ;
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}
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// Initial test for /sys/class/gpio operations:
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/**/ if (strcasecmp (argv [1], "exports" ) == 0)
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{ doExports () ; return 0 ; }
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else if (strcasecmp (argv [1], "export" ) == 0)
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{ doExport (argc, argv) ; return 0 ; }
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else if (strcasecmp (argv [1], "edge" ) == 0)
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{ doEdge (argc, argv) ; return 0 ; }
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else if (strcasecmp (argv [1], "unexportall") == 0)
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{ doUnexportall (argc, argv) ; return 0 ; }
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else if (strcasecmp (argv [1], "unexport") == 0)
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{ doUnexport (argc, argv) ; return 0 ; }
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// Check for -g argument
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if (strcasecmp (argv [1], "-g") == 0)
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{
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if (wiringPiSetupGpio () == -1)
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{
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fprintf (stderr, "%s: Unable to initialise GPIO in GPIO mode.\n", argv [0]) ;
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exit (1) ;
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}
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for (i = 2 ; i < argc ; ++i)
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argv [i - 1] = argv [i] ;
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--argc ;
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wpMode = WPI_MODE_GPIO ;
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}
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// Check for -p argument for PiFace
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else if (strcasecmp (argv [1], "-p") == 0)
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{
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if (wiringPiSetupPiFaceForGpioProg () == -1)
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{
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fprintf (stderr, "%s: Unable to initialise PiFace.\n", argv [0]) ;
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exit (1) ;
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}
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for (i = 2 ; i < argc ; ++i)
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argv [i - 1] = argv [i] ;
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--argc ;
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wpMode = WPI_MODE_PIFACE ;
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}
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// Default to wiringPi mode
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else
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|
{
|
|
if (wiringPiSetup () == -1)
|
|
{
|
|
fprintf (stderr, "%s: Unable to initialise GPIO in wiringPi mode\n", argv [0]) ;
|
|
exit (1) ;
|
|
}
|
|
wpMode = WPI_MODE_PINS ;
|
|
}
|
|
|
|
/**/ if (strcasecmp (argv [1], "write" ) == 0)
|
|
doWrite (argc, argv) ;
|
|
else if (strcasecmp (argv [1], "read" ) == 0)
|
|
doRead (argc, argv) ;
|
|
else if (strcasecmp (argv [1], "mode" ) == 0)
|
|
doMode (argc, argv) ;
|
|
else if (strcasecmp (argv [1], "pwm" ) == 0)
|
|
doPwm (argc, argv) ;
|
|
else
|
|
{
|
|
fprintf (stderr, "%s: Unknown command: %s. (read/write/pwm/mode expected)\n", argv [0], argv [1]) ;
|
|
exit (1) ;
|
|
}
|
|
return 0 ;
|
|
}
|