328 lines
9.6 KiB
C
328 lines
9.6 KiB
C
/****************************************************************************
|
|
* 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
|
|
****************************************************************************/
|
|
|
|
#ifdef BUILD_MODULE
|
|
int main(int argc, FAR char *argv[])
|
|
#else
|
|
int gpio_main(int argc, char *argv[])
|
|
#endif
|
|
{
|
|
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_OUTPUT_PIN:
|
|
{
|
|
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",
|
|
devpath, (unsigned int)outvalue, 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 */
|
|
|
|
(void)sigemptyset(&set);
|
|
(void)sigaddset(&set, signo);
|
|
|
|
ts.tv_sec = 5;
|
|
ts.tv_nsec = 0;
|
|
|
|
ret = sigtimedwait(&set, NULL, &ts);
|
|
(void)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;
|
|
}
|