/****************************************************************************
* examples/buttons/buttons_main.c
*
* Copyright (C) 2016-2017 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 <string.h>
#include <stdio.h>
#include <poll.h>
#include <fcntl.h>
#include <sched.h>
#include <errno.h>
#include <nuttx/input/buttons.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef CONFIG_BUTTONS
# error "CONFIG_BUTTONS is not defined in the configuration"
#endif
#if defined(CONFIG_DISABLE_SIGNALS) && defined(CONFIG_DISABLE_POLL)
# error "You need at least SIGNALS or POLL support to read buttons"
#endif
#if !defined(CONFIG_DISABLE_SIGNALS) && !defined(CONFIG_DISABLE_POLL)
# define USE_NOTIFY_SIGNAL 1
#else
# define USE_NOTIFY_POLL 1
#endif
#ifndef CONFIG_BUTTONS_NPOLLWAITERS
# define CONFIG_BUTTONS_NPOLLWAITERS 2
#endif
#ifndef CONFIG_EXAMPLES_BUTTONS_SIGNO
# define CONFIG_EXAMPLES_BUTTONS_SIGNO 13
#endif
#ifndef CONFIG_BUTTONS_POLL_DELAY
# define CONFIG_BUTTONS_POLL_DELAY 1000
#endif
#ifndef CONFIG_EXAMPLES_BUTTONS_NAME0
# define CONFIG_EXAMPLES_BUTTONS_NAME0 "BUTTON0"
#endif
#ifndef CONFIG_EXAMPLES_BUTTONS_NAME1
# define CONFIG_EXAMPLES_BUTTONS_NAME1 "BUTTON1"
#endif
#ifndef CONFIG_EXAMPLES_BUTTONS_NAME2
# define CONFIG_EXAMPLES_BUTTONS_NAME2 "BUTTON2"
#endif
#ifndef CONFIG_EXAMPLES_BUTTONS_NAME3
# define CONFIG_EXAMPLES_BUTTONS_NAME3 "BUTTON3"
#endif
#ifndef CONFIG_EXAMPLES_BUTTONS_NAME4
# define CONFIG_EXAMPLES_BUTTONS_NAME4 "BUTTON4"
#endif
#ifndef CONFIG_EXAMPLES_BUTTONS_NAME5
# define CONFIG_EXAMPLES_BUTTONS_NAME5 "BUTTON5"
#endif
#ifndef CONFIG_EXAMPLES_BUTTONS_NAME6
# define CONFIG_EXAMPLES_BUTTONS_NAME6 "BUTTON6"
#endif
#ifndef CONFIG_EXAMPLES_BUTTONS_NAME7
# define CONFIG_EXAMPLES_BUTTONS_NAME7 "BUTTON7"
#endif
#define BUTTON_MAX 8
#ifndef CONFIG_EXAMPLES_BUTTONS_QTD
# define CONFIG_EXAMPLES_BUTTONS_QTD BUTTON_MAX
#endif
#if CONFIG_EXAMPLES_BUTTONS_QTD > 8
# error "CONFIG_EXAMPLES_BUTTONS_QTD > 8"
#endif
/****************************************************************************
* Private Data
****************************************************************************/
#ifdef CONFIG_EXAMPLES_BUTTONS_NAMES
static const char button_name[CONFIG_EXAMPLES_BUTTONS_QTD][16] =
{
CONFIG_EXAMPLES_BUTTONS_NAME0
#if CONFIG_EXAMPLES_BUTTONS_QTD > 1
, CONFIG_EXAMPLES_BUTTONS_NAME1
#endif
#if CONFIG_EXAMPLES_BUTTONS_QTD > 2
, CONFIG_EXAMPLES_BUTTONS_NAME2
#endif
#if CONFIG_EXAMPLES_BUTTONS_QTD > 3
, CONFIG_EXAMPLES_BUTTONS_NAME3
#endif
#if CONFIG_EXAMPLES_BUTTONS_QTD > 4
, CONFIG_EXAMPLES_BUTTONS_NAME4
#endif
#if CONFIG_EXAMPLES_BUTTONS_QTD > 5
, CONFIG_EXAMPLES_BUTTONS_NAME5
#endif
#if CONFIG_EXAMPLES_BUTTONS_QTD > 6
, CONFIG_EXAMPLES_BUTTONS_NAME6
#endif
#if CONFIG_EXAMPLES_BUTTONS_QTD > 7
, CONFIG_EXAMPLES_BUTTONS_NAME7
#endif
};
#endif
static bool g_button_daemon_started;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: button_daemon
****************************************************************************/
static int button_daemon(int argc, char *argv[])
{
#ifdef USE_NOTIFY_POLL
struct pollfd fds[CONFIG_BUTTONS_NPOLLWAITERS];
#endif
#ifdef USE_NOTIFY_SIGNAL
struct btn_notify_s btnevents;
#endif
btn_buttonset_t supported;
btn_buttonset_t sample = 0;
#ifdef CONFIG_EXAMPLES_BUTTONS_NAMES
btn_buttonset_t oldsample = 0;
#endif
int ret;
int fd;
int i;
UNUSED(i);
/* Indicate that we are running */
g_button_daemon_started = true;
printf("button_daemon: Running\n");
/* Open the BUTTON driver */
printf("button_daemon: Opening %s\n", CONFIG_EXAMPLES_BUTTONS_DEVPATH);
fd = open(CONFIG_EXAMPLES_BUTTONS_DEVPATH, O_RDONLY|O_NONBLOCK);
if (fd < 0)
{
int errcode = errno;
printf("button_daemon: ERROR: Failed to open %s: %d\n",
CONFIG_EXAMPLES_BUTTONS_DEVPATH, errcode);
goto errout;
}
/* Get the set of BUTTONs supported */
ret = ioctl(fd, BTNIOC_SUPPORTED,
(unsigned long)((uintptr_t)&supported));
if (ret < 0)
{
int errcode = errno;
printf("button_daemon: ERROR: ioctl(BTNIOC_SUPPORTED) failed: %d\n",
errcode);
goto errout_with_fd;
}
printf("button_daemon: Supported BUTTONs 0x%02x\n", (unsigned int)supported);
#ifdef USE_NOTIFY_SIGNAL
/* Define the notifications events */
btnevents.bn_press = supported;
btnevents.bn_release = supported;
btnevents.bn_signo = CONFIG_EXAMPLES_BUTTONS_SIGNO;
/* Register to receive a signal when buttons are pressed/released */
ret = ioctl(fd, BTNIOC_REGISTER,
(unsigned long)((uintptr_t)&btnevents));
if (ret < 0)
{
int errcode = errno;
printf("button_daemon: ERROR: ioctl(BTNIOC_SUPPORTED) failed: %d\n",
errcode);
goto errout_with_fd;
}
#endif
/* Now loop forever, waiting BUTTONs events */
for (; ; )
{
#ifdef USE_NOTIFY_SIGNAL
struct siginfo value;
sigset_t set;
#endif
#ifdef USE_NOTIFY_POLL
bool timeout;
bool pollin;
int nbytes;
#endif
#ifdef USE_NOTIFY_SIGNAL
/* Wait for a signal */
(void)sigemptyset(&set);
(void)sigaddset(&set, CONFIG_EXAMPLES_BUTTONS_SIGNO);
ret = sigwaitinfo(&set, &value);
if (ret < 0)
{
int errcode = errno;
printf("button_daemon: ERROR: sigwaitinfo() failed: %d\n", errcode);
goto errout_with_fd;
}
sample = (btn_buttonset_t)value.si_value.sival_int;
#endif
#ifdef USE_NOTIFY_POLL
/* Prepare the File Descriptor for poll */
memset(fds, 0, sizeof(struct pollfd)*CONFIG_BUTTONS_NPOLLWAITERS);
fds[0].fd = fd;
fds[0].events = POLLIN;
timeout = false;
pollin = false;
ret = poll(fds, CONFIG_BUTTONS_NPOLLWAITERS, CONFIG_BUTTONS_POLL_DELAY);
printf("\nbutton_daemon: poll returned: %d\n", ret);
if (ret < 0)
{
int errcode = errno;
printf("button_daemon: ERROR poll failed: %d\n", errcode);
}
else if (ret == 0)
{
printf("button_daemon: Timeout\n");
timeout = true;
}
else if (ret > CONFIG_BUTTONS_NPOLLWAITERS)
{
printf("button_daemon: ERROR poll reported: %d\n", errno);
}
else
{
pollin = true;
}
/* In any event, read until the pipe is empty */
for (i = 0; i < CONFIG_BUTTONS_NPOLLWAITERS; i++)
{
do
{
nbytes = read(fds[i].fd, (void *)&sample,
sizeof(btn_buttonset_t));
if (nbytes <= 0)
{
if (nbytes == 0 || errno == EAGAIN)
{
if ((fds[i].revents & POLLIN) != 0)
{
printf("button_daemon: ERROR no read data[%d]\n", i);
}
}
else if (errno != EINTR)
{
printf("button_daemon: read[%d] failed: %d\n", i, errno);
}
nbytes = 0;
}
else
{
if (timeout)
{
printf("button_daemon: ERROR? Poll timeout, but data read[%d]\n", i);
printf(" (might just be a race condition)\n");
}
}
/* Suppress error report if no read data on the next time through */
fds[i].revents = 0;
}
while (nbytes > 0);
}
#endif
#ifdef CONFIG_EXAMPLES_BUTTONS_NAMES
/* Print name of all pressed/release button */
for (i = 0; i < CONFIG_EXAMPLES_BUTTONS_QTD; i++)
{
if ((sample & (1 << i)) && !(oldsample & (1 << i)))
{
printf("%s was pressed\n", button_name[i]);
}
if (!(sample & (1 << i)) && (oldsample & (1 << i)))
{
printf("%s was released\n", button_name[i]);
}
}
oldsample = sample;
#else
printf("Sample = %d\n", sample);
#endif
/* Make sure that everything is displayed */
fflush(stdout);
usleep(1000);
}
errout_with_fd:
(void)close(fd);
errout:
g_button_daemon_started = false;
printf("button_daemon: Terminating\n");
return EXIT_FAILURE;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* buttons_main
****************************************************************************/
#ifdef BUILD_MODULE
int main(int argc, FAR char *argv[])
#else
int buttons_main(int argc, FAR char *argv[])
#endif
{
int ret;
printf("buttons_main: Starting the button_daemon\n");
if (g_button_daemon_started)
{
printf("buttons_main: button_daemon already running\n");
return EXIT_SUCCESS;
}
ret = task_create("button_daemon", CONFIG_EXAMPLES_BUTTONS_PRIORITY,
CONFIG_EXAMPLES_BUTTONS_STACKSIZE, button_daemon,
NULL);
if (ret < 0)
{
int errcode = errno;
printf("buttons_main: ERROR: Failed to start button_daemon: %d\n",
errcode);
return EXIT_FAILURE;
}
printf("buttons_main: button_daemon started\n");
return EXIT_SUCCESS;
}