mirror of
https://github.com/clockworkpi/WiringPi.git
synced 2025-12-13 00:08:51 +01:00
419 lines
8.9 KiB
C
419 lines
8.9 KiB
C
/*
|
|
* gpio.c:
|
|
* Set-UID command-line interface to the Raspberry Pi's GPIO
|
|
* Copyright (c) 2012 Gordon Henderson
|
|
***********************************************************************
|
|
* This file is part of wiringPi:
|
|
* https://projects.drogon.net/raspberry-pi/wiringpi/
|
|
*
|
|
* wiringPi is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* wiringPi is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
|
|
***********************************************************************
|
|
*/
|
|
|
|
#include <wiringPi.h>
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <sys/types.h>
|
|
//#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
|
|
|
|
static int wpMode ;
|
|
|
|
|
|
char *usage = "Usage: gpio [-g] <read/write/pwm/mode/export/unexport/exports> ..." ;
|
|
|
|
|
|
/*
|
|
* doExports:
|
|
* List all GPIO exports
|
|
*********************************************************************************
|
|
*/
|
|
|
|
void doExports (void)
|
|
{
|
|
int fd ;
|
|
int i, l, first ;
|
|
char fName [128] ;
|
|
char dir, val ;
|
|
|
|
// Rather crude, but who knows what others are up to...
|
|
|
|
for (first = 0, i = 0 ; i < 64 ; ++i)
|
|
{
|
|
|
|
// Try to read the direction
|
|
|
|
sprintf (fName, "/sys/class/gpio/gpio%d/direction", i) ;
|
|
if ((fd = open (fName, O_RDONLY)) == -1)
|
|
continue ;
|
|
|
|
if (first == 0)
|
|
{
|
|
++first ;
|
|
printf ("GPIO Pins exported:\n") ;
|
|
}
|
|
|
|
printf ("%4d: ", i) ;
|
|
|
|
if ((l = read (fd, &dir, 1)) == 0)
|
|
{
|
|
printf ("Empty direction file (why?)\n") ;
|
|
close (fd) ;
|
|
continue ;
|
|
}
|
|
|
|
/**/ if (dir == 'o')
|
|
printf ("Output ") ;
|
|
else if (dir == 'i')
|
|
printf ("Input ") ;
|
|
else
|
|
printf ("Wrong ") ;
|
|
|
|
close (fd) ;
|
|
|
|
// Try to Read the value
|
|
|
|
sprintf (fName, "/sys/class/gpio/gpio%d/value", i) ;
|
|
if ((fd = open (fName, O_RDONLY)) == -1)
|
|
{
|
|
printf ("No Value file (huh?)\n") ;
|
|
continue ;
|
|
}
|
|
|
|
if ((l = read (fd, &val, 1)) == 0)
|
|
{
|
|
printf ("Empty Value file (why?)\n") ;
|
|
close (fd) ;
|
|
continue ;
|
|
}
|
|
|
|
/**/ if (val == '0' )
|
|
printf ("(0)\n") ;
|
|
else if (val == '1')
|
|
printf ("(1)\n") ;
|
|
else
|
|
printf ("(?)\n") ;
|
|
|
|
close (fd) ;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* doExport:
|
|
* gpio export pin mode
|
|
* This uses the /sys/class/gpio device interface.
|
|
*********************************************************************************
|
|
*/
|
|
|
|
void doExport (int argc, char *argv [])
|
|
{
|
|
FILE *fd ;
|
|
int pin ;
|
|
char *mode ;
|
|
char fName [128] ;
|
|
uid_t uid ;
|
|
gid_t gid ;
|
|
|
|
if (argc != 4)
|
|
{
|
|
fprintf (stderr, "Usage: %s export pin mode\n", argv [0]) ;
|
|
exit (1) ;
|
|
}
|
|
|
|
pin = atoi (argv [2]) ;
|
|
|
|
mode = argv [3] ;
|
|
|
|
if ((fd = fopen ("/sys/class/gpio/export", "w")) == NULL)
|
|
{
|
|
fprintf (stderr, "%s: Unable to open GPIO export interface: %s\n", argv [0], strerror (errno)) ;
|
|
exit (1) ;
|
|
}
|
|
|
|
fprintf (fd, "%d\n", pin) ;
|
|
fclose (fd) ;
|
|
|
|
sprintf (fName, "/sys/class/gpio/gpio%d/direction", pin) ;
|
|
if ((fd = fopen (fName, "w")) == NULL)
|
|
{
|
|
fprintf (stderr, "%s: Unable to open GPIO direction interface for pin %d: %s\n", argv [0], pin, strerror (errno)) ;
|
|
exit (1) ;
|
|
}
|
|
|
|
/**/ if (strcasecmp (mode, "in") == 0)
|
|
fprintf (fd, "in\n") ;
|
|
else if (strcasecmp (mode, "out") == 0)
|
|
fprintf (fd, "out\n") ;
|
|
else
|
|
{
|
|
fprintf (stderr, "%s: Invalid mode: %s. Should be in or out\n", argv [1], mode) ;
|
|
exit (1) ;
|
|
}
|
|
|
|
fclose (fd) ;
|
|
|
|
// Change ownership so the current user can actually use it!
|
|
|
|
uid = getuid () ;
|
|
gid = getgid () ;
|
|
|
|
sprintf (fName, "/sys/class/gpio/gpio%d/value", pin) ;
|
|
if (chown (fName, uid, gid) != 0)
|
|
{
|
|
fprintf (stderr, "%s: Unable to change ownership of the value file: %s\n", argv [1], strerror (errno)) ;
|
|
exit (1) ;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
/*
|
|
* doUnexport:
|
|
* gpio unexport pin
|
|
* This uses the /sys/class/gpio device interface.
|
|
*********************************************************************************
|
|
*/
|
|
|
|
void doUnexport (int argc, char *argv [])
|
|
{
|
|
FILE *fd ;
|
|
int pin ;
|
|
|
|
if (argc != 3)
|
|
{
|
|
fprintf (stderr, "Usage: %s unexport pin\n", argv [0]) ;
|
|
exit (1) ;
|
|
}
|
|
|
|
pin = atoi (argv [2]) ;
|
|
|
|
if ((fd = fopen ("/sys/class/gpio/unexport", "w")) == NULL)
|
|
{
|
|
fprintf (stderr, "%s: Unable to open GPIO export interface\n", argv [0]) ;
|
|
exit (1) ;
|
|
}
|
|
|
|
fprintf (fd, "%d\n", pin) ;
|
|
fclose (fd) ;
|
|
}
|
|
|
|
/*
|
|
* doMode:
|
|
* gpio mode pin mode ...
|
|
*********************************************************************************
|
|
*/
|
|
|
|
void doMode (int argc, char *argv [])
|
|
{
|
|
int pin ;
|
|
char *mode ;
|
|
|
|
if (argc != 4)
|
|
{
|
|
fprintf (stderr, "Usage: %s mode pin mode\n", argv [0]) ;
|
|
exit (1) ;
|
|
}
|
|
|
|
pin = atoi (argv [2]) ;
|
|
|
|
if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
|
|
return ;
|
|
|
|
mode = argv [3] ;
|
|
|
|
/**/ if (strcasecmp (mode, "in") == 0)
|
|
pinMode (pin, INPUT) ;
|
|
else if (strcasecmp (mode, "out") == 0)
|
|
pinMode (pin, OUTPUT) ;
|
|
else if (strcasecmp (mode, "pwm") == 0)
|
|
pinMode (pin, PWM_OUTPUT) ;
|
|
else if (strcasecmp (mode, "up") == 0)
|
|
pullUpDnControl (pin, PUD_UP) ;
|
|
else if (strcasecmp (mode, "down") == 0)
|
|
pullUpDnControl (pin, PUD_DOWN) ;
|
|
else if (strcasecmp (mode, "tri") == 0)
|
|
pullUpDnControl (pin, PUD_OFF) ;
|
|
else
|
|
{
|
|
fprintf (stderr, "%s: Invalid mode: %s. Should be in/out/pwm/up/down/tri\n", argv [1], mode) ;
|
|
exit (1) ;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* doWrite:
|
|
* gpio write pin value
|
|
*********************************************************************************
|
|
*/
|
|
|
|
void doWrite (int argc, char *argv [])
|
|
{
|
|
int pin, val ;
|
|
|
|
if (argc != 4)
|
|
{
|
|
fprintf (stderr, "Usage: %s write pin value\n", argv [0]) ;
|
|
exit (1) ;
|
|
}
|
|
|
|
pin = atoi (argv [2]) ;
|
|
|
|
if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
|
|
return ;
|
|
|
|
val = atoi (argv [3]) ;
|
|
|
|
/**/ if (val == 0)
|
|
digitalWrite (pin, LOW) ;
|
|
else
|
|
digitalWrite (pin, HIGH) ;
|
|
}
|
|
|
|
|
|
/*
|
|
* doRead:
|
|
* Read a pin and return the value
|
|
*********************************************************************************
|
|
*/
|
|
|
|
void doRead (int argc, char *argv [])
|
|
{
|
|
int pin, val ;
|
|
|
|
if (argc != 3)
|
|
{
|
|
fprintf (stderr, "Usage: %s read pin\n", argv [0]) ;
|
|
exit (1) ;
|
|
}
|
|
|
|
pin = atoi (argv [2]) ;
|
|
|
|
if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
|
|
{
|
|
printf ("0\n") ;
|
|
return ;
|
|
}
|
|
|
|
val = digitalRead (pin) ;
|
|
|
|
printf ("%s\n", val == 0 ? "0" : "1") ;
|
|
}
|
|
|
|
|
|
/*
|
|
* doPwm:
|
|
* Output a PWM value on a pin
|
|
*********************************************************************************
|
|
*/
|
|
|
|
void doPwm (int argc, char *argv [])
|
|
{
|
|
int pin, val ;
|
|
|
|
if (argc != 4)
|
|
{
|
|
fprintf (stderr, "Usage: %s pwm <pin> <value>\n", argv [0]) ;
|
|
exit (1) ;
|
|
}
|
|
|
|
pin = atoi (argv [2]) ;
|
|
|
|
if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
|
|
return ;
|
|
|
|
val = atoi (argv [3]) ;
|
|
|
|
pwmWrite (pin, val) ;
|
|
}
|
|
|
|
|
|
/*
|
|
* main:
|
|
* Start here
|
|
*********************************************************************************
|
|
*/
|
|
|
|
int main (int argc, char *argv [])
|
|
{
|
|
int i ;
|
|
|
|
if (argc == 1)
|
|
{
|
|
fprintf (stderr, "%s: %s\n", argv [0], usage) ;
|
|
return 1 ;
|
|
}
|
|
|
|
if (geteuid () != 0)
|
|
{
|
|
fprintf (stderr, "%s: Must be root to run\n", argv [0]) ;
|
|
return 1 ;
|
|
}
|
|
|
|
// Initial test for /sys/class/gpio operations:
|
|
|
|
/**/ if (strcasecmp (argv [1], "exports" ) == 0)
|
|
{ doExports () ; return 0 ; }
|
|
else if (strcasecmp (argv [1], "export" ) == 0)
|
|
{ doExport (argc, argv) ; return 0 ; }
|
|
else if (strcasecmp (argv [1], "unexport") == 0)
|
|
{ doUnexport (argc, argv) ; return 0 ; }
|
|
|
|
// Check for -g argument
|
|
|
|
if (strcasecmp (argv [1], "-g") == 0)
|
|
{
|
|
if (wiringPiSetupGpio () == -1)
|
|
{
|
|
fprintf (stderr, "%s: Unable to initialise GPIO in GPIO mode.\n", argv [0]) ;
|
|
exit (1) ;
|
|
}
|
|
|
|
for (i = 2 ; i < argc ; ++i)
|
|
argv [i - 1] = argv [i] ;
|
|
--argc ;
|
|
wpMode = WPI_MODE_GPIO ;
|
|
}
|
|
else
|
|
{
|
|
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/export/unexport expected)\n", argv [0], argv [1]) ;
|
|
exit (1) ;
|
|
}
|
|
return 0 ;
|
|
}
|