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nuttx-apps/examples/chrono/chrono_main.c

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/****************************************************************************
* examples/chrono/chrono_main.c
*
* Copyright (C) 2008, 2011-2012 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <time.h>
#include <sys/time.h>
#include <nuttx/input/buttons.h>
#include <nuttx/lcd/slcd_ioctl.h>
#include <nuttx/lcd/slcd_codec.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define BUTTON_SIGNO 13
#define BUTTON_STACKSIZE 2048
#define BUTTON_PRIORITY 100
#define BUTTON_DEVPATH "/dev/buttons"
#define SLCD_DEVNAME "/dev/slcd0"
#define SLCD_BUFSIZE 8
/****************************************************************************
* Private Types
****************************************************************************/
/* What is the current chronometer status? */
enum chronostate_e
{
CHRONO_RESETED = 0,
CHRONO_RUNNING,
CHRONO_STOPPED,
};
/* All state information for this test is kept within the following structure
* in order create a namespace and to minimize the possibility of name
* collisions.
*
* NOTE: stream must be the first element of struct slcd_chrono_s to support
* casting between these two types.
*/
struct slcd_chrono_s
{
struct lib_outstream_s stream; /* Stream to use for all output */
struct slcd_attributes_s attr; /* Size of the SLCD (rows x columns) */
int fd; /* File descriptor or the open SLCD device */
bool initialized; /* TRUE: Initialized */
struct timespec ts_start; /* Store the initial time */
struct timespec ts_end; /* Store the final time */
int state;
/* The I/O buffer */
uint8_t buffer[SLCD_BUFSIZE];
};
/****************************************************************************
* Private Data
****************************************************************************/
static struct slcd_chrono_s g_slcd;
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: button_daemon
****************************************************************************/
static int button_daemon(int argc, char *argv[])
{
FAR struct slcd_chrono_s *priv = &g_slcd;
struct btn_notify_s btnevents;
btn_buttonset_t supported;
int ret;
int fd;
int i;
UNUSED(i);
printf("button_daemon: Running\n");
/* Open the BUTTON driver */
printf("button_daemon: Opening %s\n", BUTTON_DEVPATH);
fd = open(BUTTON_DEVPATH, O_RDONLY | O_NONBLOCK);
if (fd < 0)
{
int errcode = errno;
printf("button_daemon: ERROR: Failed to open %s: %d\n",
BUTTON_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);
/* Define the notifications events */
btnevents.bn_press = supported;
btnevents.bn_release = supported;
btnevents.bn_event.sigev_notify = SIGEV_SIGNAL;
btnevents.bn_event.sigev_signo = BUTTON_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;
}
/* Now loop forever, waiting BUTTONs events */
for (; ; )
{
struct siginfo value;
sigset_t set;
/* Wait for a signal */
(void)sigemptyset(&set);
(void)sigaddset(&set, BUTTON_SIGNO);
ret = sigwaitinfo(&set, &value);
if (ret < 0)
{
int errcode = errno;
printf("button_daemon: ERROR: sigwaitinfo() failed: %d\n", errcode);
goto errout_with_fd;
}
if (priv->state == CHRONO_STOPPED)
{
(void)clock_gettime(CLOCK_MONOTONIC, &priv->ts_start);
priv->state = CHRONO_RUNNING;
}
else
{
priv->state = CHRONO_STOPPED;
}
/* Make sure that everything is displayed */
fflush(stdout);
usleep(1000);
}
errout_with_fd:
(void)close(fd);
errout:
printf("button_daemon: Terminating\n");
return EXIT_FAILURE;
}
/****************************************************************************
* Name: slcd_flush
****************************************************************************/
static int slcd_flush(FAR struct lib_outstream_s *stream)
{
FAR struct slcd_chrono_s *priv = (FAR struct slcd_chrono_s *)stream;
FAR const uint8_t *buffer;
ssize_t nwritten;
ssize_t remaining;
/* Loop until all bytes were written (handling both partial and interrupted
* writes).
*/
remaining = stream->nput;
buffer = priv->buffer;
while (remaining > 0)
{
nwritten = write(priv->fd, buffer, remaining);
if (nwritten < 0)
{
int errcode = errno;
printf("write failed: %d\n", errcode);
if (errcode != EINTR)
{
exit(EXIT_FAILURE);
}
}
else
{
remaining -= nwritten;
buffer += nwritten;
}
}
/* Reset the stream */
stream->nput = 0;
return OK;
}
/****************************************************************************
* Name: slcd_putc
****************************************************************************/
static void slcd_putc(FAR struct lib_outstream_s *stream, int ch)
{
FAR struct slcd_chrono_s *priv = (FAR struct slcd_chrono_s *)stream;
/* Write the character to the buffer */
priv->buffer[stream->nput] = ch;
stream->nput++;
priv->buffer[stream->nput] = '\0';
/* If the buffer is full, flush it */
if (stream->nput >= CONFIG_EXAMPLES_SLCD_BUFSIZE)
{
(void)slcd_flush(stream);
}
}
/****************************************************************************
* Name: slcd_puts
****************************************************************************/
static void slcd_puts(FAR struct lib_outstream_s *outstream,
FAR const char *str)
{
for (; *str; str++)
{
slcd_put((int)*str, outstream);
}
}
/****************************************************************************
* chrono_main
****************************************************************************/
int main(int argc, FAR char *argv[])
{
FAR struct slcd_chrono_s *priv = &g_slcd;
FAR char str[8] = "00:00.0";
int fd;
int ret;
long sec;
long min;
/* Create a thread to wait for the button events */
ret = task_create("button_daemon", BUTTON_PRIORITY,
BUTTON_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;
}
/* Open the SLCD device */
printf("Opening %s for read/write access\n", SLCD_DEVNAME);
fd = open(SLCD_DEVNAME, O_RDWR);
if (fd < 0)
{
printf("Failed to open %s: %d\n", CONFIG_EXAMPLES_SLCD_DEVNAME, errno);
goto errout;
}
/* Get the attributes of the SCLD device */
ret = ioctl(fd, SLCDIOC_GETATTRIBUTES, (unsigned long)&priv->attr);
if (ret < 0)
{
printf("ioctl(SLCDIOC_GETATTRIBUTES) failed: %d\n", errno);
goto errout_with_fd;
}
/* Are we already initialized? */
if (!priv->initialized)
{
/* Initialize the output stream */
memset(priv, 0, sizeof(struct slcd_chrono_s));
priv->stream.put = slcd_putc;
#ifdef CONFIG_STDIO_LINEBUFFER
priv->stream.flush = slcd_flush;
#endif
/* Get the attributes of the SCLD device */
ret = ioctl(fd, SLCDIOC_GETATTRIBUTES, (unsigned long)&priv->attr);
if (ret < 0)
{
printf("ioctl(SLCDIOC_GETATTRIBUTES) failed: %d\n", errno);
goto errout_with_fd;
}
printf("Attributes:\n");
printf(" rows: %d columns: %d nbars: %d\n",
priv->attr.nrows, priv->attr.ncolumns, priv->attr.nbars);
printf(" max contrast: %d max brightness: %d\n",
priv->attr.maxcontrast, priv->attr.maxbrightness);
/* Home the cursor and clear the display */
printf("Clear screen\n");
slcd_encode(SLCDCODE_CLEAR, 0, &priv->stream);
slcd_flush(&priv->stream);
priv->initialized = true;
}
/* Save the file descriptor in a place where slcd_flush can find it */
priv->fd = fd;
/* Set the cursor to the beginning of the current row by homing the cursor
* then going down as necessary, and erase to the end of the line.
*/
slcd_encode(SLCDCODE_HOME, 0, &priv->stream);
slcd_encode(SLCDCODE_ERASEEOL, 0, &priv->stream);
priv->state = CHRONO_RESETED;
for (; ; )
{
/* If the device is reseted, show 00.. and assume it is initial time */
if (priv->state == CHRONO_RESETED)
{
/* Copy the initial value */
strncpy(str, "00:00.0", 7);
/* Print the initial reset value */
slcd_puts(&priv->stream, str);
slcd_flush(&priv->stream);
/* Move to stopped state to avoid wasting time here */
priv->state = CHRONO_STOPPED;
}
/* If the device is stopped nothing to do here */
if (priv->state == CHRONO_STOPPED)
{
}
/* If the chronometer is running, get the elapsed time and how it */
if (priv->state == CHRONO_RUNNING)
{
/* Get the current time */
(void)clock_gettime(CLOCK_MONOTONIC, &priv->ts_end);
/* How many seconds passed from initial time? */
sec = priv->ts_end.tv_sec - priv->ts_start.tv_sec;
/* Get the amount of minutes */
min = sec / 60;
/* Get the remaining seconds */
sec = sec % 60;
sprintf(str, "%02d:%02d:%01d", min, sec,
(priv->ts_end.tv_nsec / 100000000));
/* Print it into LCD */
slcd_encode(SLCDCODE_HOME, 0, &priv->stream);
slcd_puts(&priv->stream, str);
slcd_flush(&priv->stream);
}
/* usleep(1000); */
}
/* Normal exit */
close(fd);
return 0;
errout_with_fd:
close(priv->fd);
errout:
priv->initialized = false;
exit(EXIT_FAILURE);
}
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