/****************************************************************************
* examples/gpio/gpio_main.c
*
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/ioctl.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <signal.h>
#include <errno.h>
#include <nuttx/ioexpander/gpio.h>
/****************************************************************************
* Private Functions
****************************************************************************/
static void show_usage(FAR const char *progname)
{
fprintf(stderr, "USAGE: %s [-w <signo>] [-o <value>] <driver-path>\n",
progname);
fprintf(stderr, " %s -h\n", progname);
fprintf(stderr, "Where:\n");
fprintf(stderr, "\t<driver-path>: The full path to the GPIO pin "
"driver.\n");
fprintf(stderr,
"\t-w <signo>: Wait for an signal if this is an interrupt pin.\n");
fprintf(stderr,
"\t-o <value>: Write this value (0 or 1) if this is an output "
"pin.\n");
fprintf(stderr, "\t-h: Print this usage information and exit.\n");
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* gpio_main
****************************************************************************/
int main(int argc, FAR char *argv[])
{
FAR char *devpath = NULL;
enum gpio_pintype_e pintype;
bool havesigno = false;
bool invalue;
bool outvalue = false;
bool haveout = false;
int signo = 0;
int ndx;
int ret;
int fd;
/* Parse command line */
if (argc < 2)
{
fprintf(stderr, "ERROR: Missing required arguments\n");
show_usage(argv[0]);
return EXIT_FAILURE;
}
ndx = 1;
if (strcmp(argv[ndx], "-h") == 0)
{
show_usage(argv[0]);
return EXIT_FAILURE;
}
if (strcmp(argv[ndx], "-w") == 0)
{
havesigno = true;
if (++ndx >= argc)
{
fprintf(stderr, "ERROR: Missing argument to -o\n");
show_usage(argv[0]);
return EXIT_FAILURE;
}
signo = atoi(argv[ndx]);
if (++ndx >= argc)
{
fprintf(stderr, "ERROR: Missing required <driver-path>\n");
show_usage(argv[0]);
return EXIT_FAILURE;
}
}
if (ndx < argc && strcmp(argv[ndx], "-o") == 0)
{
if (++ndx >= argc)
{
fprintf(stderr, "ERROR: Missing argument to -o\n");
show_usage(argv[0]);
return EXIT_FAILURE;
}
if (strcmp(argv[ndx], "0") == 0)
{
outvalue = false;
haveout = true;
}
else if (strcmp(argv[ndx], "1") == 0)
{
outvalue = true;
haveout = true;
}
else
{
fprintf(stderr, "ERROR: Invalid argument to -o\n");
show_usage(argv[0]);
return EXIT_FAILURE;
}
if (++ndx >= argc)
{
fprintf(stderr, "ERROR: Missing required <driver-path>\n");
show_usage(argv[0]);
return EXIT_FAILURE;
}
}
devpath = argv[ndx];
printf("Driver: %s\n", devpath);
/* Open the pin driver */
fd = open(devpath, O_RDWR);
if (fd < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: Failed to open %s: %d\n", devpath, errcode);
return EXIT_FAILURE;
}
/* Get the pin type */
ret = ioctl(fd, GPIOC_PINTYPE, (unsigned long)((uintptr_t)&pintype));
if (ret < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: Failed to read pintype from %s: %d\n",
devpath, errcode);
close(fd);
return EXIT_FAILURE;
}
/* Read the pin value */
ret = ioctl(fd, GPIOC_READ, (unsigned long)((uintptr_t)&invalue));
if (ret < 0)
{
int errcode = errno;
fprintf(stderr, "ERROR: Failed to read value from %s: %d\n",
devpath, errcode);
close(fd);
return EXIT_FAILURE;
}
/* Perform the test based on the pintype and on command line options */
switch (pintype)
{
case GPIO_INPUT_PIN:
{
printf(" Input pin: Value=%u\n",
(unsigned int)invalue);
}
break;
case GPIO_INPUT_PIN_PULLUP:
{
printf(" Input pin (pull-up): Value=%u\n",
(unsigned int)invalue);
}
break;
case GPIO_INPUT_PIN_PULLDOWN:
{
printf(" Input pin (pull-down): Value=%u\n",
(unsigned int)invalue);
}
break;
case GPIO_OUTPUT_PIN:
case GPIO_OUTPUT_PIN_OPENDRAIN:
{
printf(" Output pin: Value=%u\n", (unsigned int)invalue);
if (haveout)
{
printf(" Writing: Value=%u\n", (unsigned int)outvalue);
/* Write the pin value */
ret = ioctl(fd, GPIOC_WRITE, (unsigned long)outvalue);
if (ret < 0)
{
int errcode = errno;
fprintf(stderr,
"ERROR: Failed to write value %u from %s: %d\n",
(unsigned int)outvalue, devpath, errcode);
close(fd);
return EXIT_FAILURE;
}
/* Re-read the pin value */
ret = ioctl(fd, GPIOC_READ,
(unsigned long)((uintptr_t)&invalue));
if (ret < 0)
{
int errcode = errno;
fprintf(stderr,
"ERROR: Failed to re-read value from %s: %d\n",
devpath, errcode);
close(fd);
return EXIT_FAILURE;
}
printf(" Verify: Value=%u\n", (unsigned int)invalue);
}
}
break;
case GPIO_INTERRUPT_PIN:
{
printf(" Interrupt pin: Value=%u\n", invalue);
if (havesigno)
{
struct sigevent notify;
struct timespec ts;
sigset_t set;
notify.sigev_notify = SIGEV_SIGNAL;
notify.sigev_signo = signo;
/* Set up to receive signal */
ret = ioctl(fd, GPIOC_REGISTER, (unsigned long)¬ify);
if (ret < 0)
{
int errcode = errno;
fprintf(stderr,
"ERROR: Failed to setup for signal from %s: %d\n",
devpath, errcode);
close(fd);
return EXIT_FAILURE;
}
/* Wait up to 5 seconds for the signal */
sigemptyset(&set);
sigaddset(&set, signo);
ts.tv_sec = 5;
ts.tv_nsec = 0;
ret = sigtimedwait(&set, NULL, &ts);
ioctl(fd, GPIOC_UNREGISTER, 0);
if (ret < 0)
{
int errcode = errno;
if (errcode == EAGAIN)
{
printf(" [Five second timeout with no signal]\n");
close(fd);
return EXIT_SUCCESS;
}
else
{
fprintf(stderr, "ERROR: Failed to wait signal %d "
"from %s: %d\n", signo, devpath, errcode);
close(fd);
return EXIT_FAILURE;
}
}
/* Re-read the pin value */
ret = ioctl(fd, GPIOC_READ,
(unsigned long)((uintptr_t)&invalue));
if (ret < 0)
{
int errcode = errno;
fprintf(stderr,
"ERROR: Failed to re-read value from %s: %d\n",
devpath, errcode);
close(fd);
return EXIT_FAILURE;
}
printf(" Verify: Value=%u\n", (unsigned int)invalue);
}
}
break;
default:
fprintf(stderr, "ERROR: Unrecognized pintype: %d\n", (int)pintype);
close(fd);
return EXIT_FAILURE;
}
close(fd);
return EXIT_SUCCESS;
}