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New timing methods

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This commit is contained in:
Gordon Drogon
2012-08-17 10:16:31 +01:00
committed by Philip Howard
parent 43aa862e97
commit d24a8fc4cb
24 changed files with 2308 additions and 392 deletions
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165
gpio/COPYING.LESSER Normal file
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@@ -0,0 +1,165 @@
GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
0. Additional Definitions.
As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.
"The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.
An "Application" is any work that makes use of an interface provided
by the Library, but which is not otherwise based on the Library.
Defining a subclass of a class defined by the Library is deemed a mode
of using an interface provided by the Library.
A "Combined Work" is a work produced by combining or linking an
Application with the Library. The particular version of the Library
with which the Combined Work was made is also called the "Linked
Version".
The "Minimal Corresponding Source" for a Combined Work means the
Corresponding Source for the Combined Work, excluding any source code
for portions of the Combined Work that, considered in isolation, are
based on the Application, and not on the Linked Version.
The "Corresponding Application Code" for a Combined Work means the
object code and/or source code for the Application, including any data
and utility programs needed for reproducing the Combined Work from the
Application, but excluding the System Libraries of the Combined Work.
1. Exception to Section 3 of the GNU GPL.
You may convey a covered work under sections 3 and 4 of this License
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taken together, effectively do not restrict modification of the
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5. Combined Libraries.
You may place library facilities that are a work based on the
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6. Revised Versions of the GNU Lesser General Public License.
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6
gpio/Makefile
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@@ -9,16 +9,16 @@
# Wiring Compatable library for the Raspberry Pi
#
# wiringPi is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# it under the terms of the GNU Lesser 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.
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# You should have received a copy of the GNU Lesser General Public License
# along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
#################################################################################

76
gpio/gpio.1
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@@ -1,15 +1,23 @@
.TH "GPIO" "14 June 2012" "Command-Line access to Raspberry Pi GPIO"
.TH "GPIO" "14 June 2012" "Command-Line access to Raspberry Pi and PiFace GPIO"
.SH NAME
gpio \- Command-line access to Raspberry Pi GPIO
gpio \- Command-line access to Raspberry Pi and PiFace GPIO
.SH SYNOPSIS
.TP
.B gpio
.RB [ \-v ]
.TP
.B gpio
.RB [ \-g ]
.RB < read/write/pwm/mode ...>
.TP
.B gpio
.RB < export/unexport/exports ...>
.RB [ \-p ]
.RB < read/write/mode ...>
.TP
.B gpio
.RB < export/edge/unexport/unexportall/exports ...>
.SH DESCRIPTION
@@ -19,15 +27,23 @@ on the Raspberry Pi. It's designed for simple testing and diagnostic
purposes, but can be used in shell scripts for general if somewhat slow
control of the GPIO pins.
Additionally, it can be used to set the exports in the /sys/class/gpio
system directory to allow subsequent programs to use the /sys/class/gpio
Additionally, it can be used to set the exports in the \fI/sys/class/gpio\fR
system directory to allow subsequent programs to use the \fR/sys/class/gpio\fR
interface without needing to be run as root.
.SH OPTIONS
.TP
.B \-v
Output the current version
.TP
.B \-g
Use the BCM_GPIO pins numbers rather than WiringPi pin numbers.
Use the BCM_GPIO pins numbers rather than wiringPi pin numbers.
.TP
.B \-p
Use the PiFace interface board and its corresponding pin numbers.
.TP
.B read
@@ -44,27 +60,45 @@ Write a PWM value (0-1023) to the given pin.
.TP
.B mode
Set a pin into input, output or pwm mode. Can also use the literals up, down or tri
to set the internal pull-up, pull-down or tristate controls.
Set a pin into \fIinput\fR, \fIoutput\fR or \fIpwm\fR mode. Can also
use the literals \fIup\fR, \fIdown\fR or \fItri\fR to set the internal
pull-up, pull-down or tristate (off) controls.
.TP
.B export
Export a GPIO pin in the /sys/class/gpio directory. Use like the mode command above
however only in and out are supported at this time.
Export a GPIO pin in the \fI/sys/class/gpio\fR directory. Use like the
mode command above however only \fIin\fR and \fIout\fR are supported at
this time. Note that the pin number is the \fBBCM_GPIO\fR number and
not the wiringPi number.
Once a GPIO pin has been exported, the
.B gpio
program changes the ownership of the /sys/class/gpio/gpioX/value pseudo file to
that of the user running the
.B gpio
program. This means that you can have a small script of gpio exports to setup
the gpio pins as your program requires without the need to run anything as
root, or with the sudo command.
Once a GPIO pin has been exported, the \fBgpio\fR program changes the
ownership of the \fI/sys/class/gpio/gpioX/value\fR and if present in
later kernels, the \fI/sys/class/gpio/gpioX/edge\fR pseudo files to
that of the user running the \fBgpio\fR program. This means that you
can have a small script of gpio exports to setup the gpio pins as your
program requires without the need to run anything as root, or with the
sudo command.
.TP
.B edge
This exports a GPIO pin in the \fI/sys/class/gpio\fR directory, set
the direction to input and set the edge interrupt method to \fInone\fR,
\fIrising\fR, \fIfalling\fR or \fIboth\fR. Use like the export command
above and note that \fBBCM_GPIO\fR pin number is used not not wiringPi pin
numbering.
Like the export commands abovem ownership is set to that of the
calling user, allowing subsequent access from user programs without
requiring root/sudo.
.TP
.B unexport
Un-Export a GPIO pin in the /sys/class/gpio directory.
.TP
.B unexportall
Un-Export all the GPIO pins in the /sys/class/gpio directory.
.TP
.B exports
Print a list (if any) of all the exported GPIO pins and their current values.
@@ -119,9 +153,9 @@ gpio -g read 0 # Read GPIO Pin 0 (SDA0)
.SH "NOTES"
When using the export or unexport commands, the pin numbers are
.B always
native GPIO numbers and never wiringPi pin numbers.
When using the \fIexport\fR, \fIedge\fR or \fIunexport\fR commands, the
pin numbers are \fBalways\fR native BCM_GPIO numbers and never wiringPi
pin numbers.
.SH "SEE ALSO"

232
gpio/gpio.c
View File

@@ -7,16 +7,16 @@
* 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
* it under the terms of the GNU Lesser 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.
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* You should have received a copy of the GNU Lesser General Public License
* along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
***********************************************************************
*/
@@ -37,10 +37,10 @@
static int wpMode ;
char *usage = "Usage: gpio -v\n"
" gpio [-g] <read/write/pwm/mode/> ...\n"
" gpio <export/unexport/exports> ..." ;
" gpio [-g] <read/write/pwm/mode> ...\n"
" gpio [-p] <read/write/mode> ...\n"
" gpio <export/edge/unexport/unexportall/exports> ..." ;
/*
@@ -54,7 +54,7 @@ void doExports (void)
int fd ;
int i, l, first ;
char fName [128] ;
char dir, val ;
char buf [16] ;
// Rather crude, but who knows what others are up to...
@@ -75,19 +75,14 @@ void doExports (void)
printf ("%4d: ", i) ;
if ((l = read (fd, &dir, 1)) == 0)
{
printf ("Empty direction file (why?)\n") ;
close (fd) ;
continue ;
}
if ((l = read (fd, buf, 16)) == 0)
sprintf (buf, "%s", "?") ;
buf [l] = 0 ;
if ((buf [strlen (buf) - 1]) == '\n')
buf [strlen (buf) - 1] = 0 ;
/**/ if (dir == 'o')
printf ("Output ") ;
else if (dir == 'i')
printf ("Input ") ;
else
printf ("Wrong ") ;
printf ("%-3s", buf) ;
close (fd) ;
@@ -100,19 +95,32 @@ void doExports (void)
continue ;
}
if ((l = read (fd, &val, 1)) == 0)
if ((l = read (fd, buf, 16)) == 0)
sprintf (buf, "%s", "?") ;
buf [l] = 0 ;
if ((buf [strlen (buf) - 1]) == '\n')
buf [strlen (buf) - 1] = 0 ;
printf (" %s", buf) ;
// Read any edge trigger file
sprintf (fName, "/sys/class/gpio/gpio%d/edge", i) ;
if ((fd = open (fName, O_RDONLY)) == -1)
{
printf ("Empty Value file (why?)\n") ;
close (fd) ;
printf ("\n") ;
continue ;
}
/**/ if (val == '0' )
printf ("(0)\n") ;
else if (val == '1')
printf ("(1)\n") ;
else
printf ("(?)\n") ;
if ((l = read (fd, buf, 16)) == 0)
sprintf (buf, "%s", "?") ;
buf [l] = 0 ;
if ((buf [strlen (buf) - 1]) == '\n')
buf [strlen (buf) - 1] = 0 ;
printf (" %-8s\n", buf) ;
close (fd) ;
}
@@ -161,9 +169,9 @@ void doExport (int argc, char *argv [])
exit (1) ;
}
/**/ if (strcasecmp (mode, "in") == 0)
/**/ if ((strcasecmp (mode, "in") == 0) || (strcasecmp (mode, "input") == 0))
fprintf (fd, "in\n") ;
else if (strcasecmp (mode, "out") == 0)
else if ((strcasecmp (mode, "out") == 0) || (strcasecmp (mode, "output") == 0))
fprintf (fd, "out\n") ;
else
{
@@ -184,7 +192,113 @@ void doExport (int argc, char *argv [])
fprintf (stderr, "%s: Unable to change ownership of the value file: %s\n", argv [1], strerror (errno)) ;
exit (1) ;
}
// Also change ownership of the edge file - if it exists
sprintf (fName, "/sys/class/gpio/gpio%d/edge", pin) ;
if (chown (fName, uid, gid) != 0)
{
if (errno != ENOENT) // Silently ignore File not found - older kernel
{
fprintf (stderr, "%s: Unable to change ownership of the value file: %s\n", argv [1], strerror (errno)) ;
exit (1) ;
}
}
}
/*
* doEdge:
* gpio edge pin mode
* Easy access to changing the edge trigger on a GPIO pin
* This uses the /sys/class/gpio device interface.
*********************************************************************************
*/
void doEdge (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 edge pin mode\n", argv [0]) ;
exit (1) ;
}
pin = atoi (argv [2]) ;
mode = argv [3] ;
// Export the pin and set direction to input
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) ;
}
fprintf (fd, "in\n") ;
fclose (fd) ;
sprintf (fName, "/sys/class/gpio/gpio%d/edge", pin) ;
if ((fd = fopen (fName, "w")) == NULL)
{
fprintf (stderr, "%s: Unable to open GPIO edge interface for pin %d: %s\n", argv [0], pin, strerror (errno)) ;
exit (1) ;
}
/**/ if (strcasecmp (mode, "none") == 0)
fprintf (fd, "none\n") ;
else if (strcasecmp (mode, "rising") == 0)
fprintf (fd, "rising\n") ;
else if (strcasecmp (mode, "falling") == 0)
fprintf (fd, "falling\n") ;
else if (strcasecmp (mode, "both") == 0)
fprintf (fd, "both\n") ;
else
{
fprintf (stderr, "%s: Invalid mode: %s. Should be none, rising, falling or both\n", argv [1], mode) ;
exit (1) ;
}
// 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) ;
}
// Also change ownership of the edge file
sprintf (fName, "/sys/class/gpio/gpio%d/edge", 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) ;
}
fclose (fd) ;
}
@@ -218,6 +332,33 @@ void doUnexport (int argc, char *argv [])
fclose (fd) ;
}
/*
* doUnexportAll:
* gpio unexportall
* Un-Export all the GPIO pins.
* This uses the /sys/class/gpio device interface.
*********************************************************************************
*/
void doUnexportall (int argc, char *argv [])
{
FILE *fd ;
int pin ;
for (pin = 0 ; pin < 63 ; ++pin)
{
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 ...
@@ -381,11 +522,15 @@ int main (int argc, char *argv [])
// Initial test for /sys/class/gpio operations:
/**/ if (strcasecmp (argv [1], "exports" ) == 0)
{ doExports () ; return 0 ; }
{ doExports () ; return 0 ; }
else if (strcasecmp (argv [1], "export" ) == 0)
{ doExport (argc, argv) ; return 0 ; }
{ doExport (argc, argv) ; return 0 ; }
else if (strcasecmp (argv [1], "edge" ) == 0)
{ doEdge (argc, argv) ; return 0 ; }
else if (strcasecmp (argv [1], "unexportall") == 0)
{ doUnexportall (argc, argv) ; return 0 ; }
else if (strcasecmp (argv [1], "unexport") == 0)
{ doUnexport (argc, argv) ; return 0 ; }
{ doUnexport (argc, argv) ; return 0 ; }
// Check for -g argument
@@ -402,6 +547,25 @@ int main (int argc, char *argv [])
--argc ;
wpMode = WPI_MODE_GPIO ;
}
// Check for -p argument for PiFace
else if (strcasecmp (argv [1], "-p") == 0)
{
if (wiringPiSetupPiFaceForGpioProg () == -1)
{
fprintf (stderr, "%s: Unable to initialise PiFace.\n", argv [0]) ;
exit (1) ;
}
for (i = 2 ; i < argc ; ++i)
argv [i - 1] = argv [i] ;
--argc ;
wpMode = WPI_MODE_PIFACE ;
}
// Default to wiringPi mode
else
{
if (wiringPiSetup () == -1)