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nuttx-apps/examples/slcd/slcd_main.c

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/****************************************************************************
* examples/clcd/slcd_main.c
*
* Copyright (C) 2013 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 <nuttx/lcd/slcd_ioctl.h>
#include <nuttx/lcd/slcd_codec.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef CONFIG_EXAMPLES_SLCD_DEVNAME
# define CONFIG_EXAMPLES_SLCD_DEVNAME "/dev/slcd"
#endif
/****************************************************************************
* Private Typs
****************************************************************************/
/* 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_test_s to support
* casting between these two types.
*/
struct slcd_test_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 */
uint8_t currow; /* Next row to display */
/* The I/O buffer */
uint8_t buffer[CONFIG_EXAMPLES_SLCD_BUFSIZE];
};
/****************************************************************************
* Private Data
****************************************************************************/
static struct slcd_test_s g_slcdtest;
static const char g_slcdhello[] = "Hello";
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: slcd_dumpbuffer
*
* Description:
* Do a pretty buffer dump
*
****************************************************************************/
void slcd_dumpbuffer(FAR const char *msg, FAR const uint8_t *buffer, unsigned int buflen)
{
int i;
int j;
int k;
printf("%s:\n", msg);
for (i = 0; i < buflen; i += 32)
{
printf("%04x: ", i);
for (j = 0; j < 32; j++)
{
k = i + j;
if (j == 16)
{
printf(" ");
}
if (k < buflen)
{
printf("%02x", buffer[k]);
}
else
{
printf(" ");
}
}
printf(" ");
for (j = 0; j < 32; j++)
{
k = i + j;
if (j == 16)
{
printf(" ");
}
if (k < buflen)
{
if (buffer[k] >= 0x20 && buffer[k] < 0x7f)
{
printf("%c", buffer[k]);
}
else
{
printf(".");
}
}
}
printf("\n");
}
}
/****************************************************************************
* Name: slcd_flush
****************************************************************************/
static int slcd_flush(FAR struct lib_outstream_s *stream)
{
FAR struct slcd_test_s *priv = (FAR struct slcd_test_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;
slcd_dumpbuffer("WRITING", buffer, remaining);
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_test_s *priv = (FAR struct slcd_test_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);
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* slcd_main
****************************************************************************/
#ifdef CONFIG_BUILD_KERNEL
int main(int argc, FAR char *argv[])
#else
int slcd_main(int argc, char *argv[])
#endif
{
FAR struct slcd_test_s *priv = &g_slcdtest;
FAR const char *str = g_slcdhello;
int fd;
int ret;
/* Parse the command line. For now, only a single optional string argument
* is supported.
*/
#if defined(CONFIG_NSH_BUILTIN_APPS)
if (argc > 1)
{
str = argv[1];
}
#endif
/* Open the SLCD device */
printf("Opening %s for read/write access\n", CONFIG_EXAMPLES_SLCD_DEVNAME);
fd = open(CONFIG_EXAMPLES_SLCD_DEVNAME, O_RDWR);
if (priv->fd < 0)
{
printf("Failed to open %s: %d\n", CONFIG_EXAMPLES_SLCD_DEVNAME, errno);
goto errout;
}
/* Are we already initialized? */
if (!priv->initialized)
{
unsigned long brightness;
/* Initialize the output stream */
memset(priv, 0, sizeof(struct slcd_test_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);
/* Set the brightness to the mid value */
brightness = ((unsigned long)priv->attr.maxbrightness + 1) >> 1;
printf("Set brightness to %lu\n", brightness);
ret = ioctl(fd, SLCDIOC_SETBRIGHTNESS, brightness);
if (ret < 0)
{
/* Report the ioctl failure, but do not error out. Some SLCDs
* do not support brightness settings.
*/
printf("ioctl(SLCDIOC_GETATTRIBUTES) failed: %d\n", errno);
}
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_DOWN, priv->currow, &priv->stream);
slcd_encode(SLCDCODE_ERASEEOL, 0, &priv->stream);
/* Increment to the next row, wrapping back to first if necessary. */
if (++priv->currow >= priv->attr.nrows)
{
priv->currow = 0;
}
/* Say hello */
printf("Print [%s]\n", str);
slcd_puts(&priv->stream, str);
slcd_flush(&priv->stream);
/* Normal exit */
printf("Test complete\n");
close(fd);
return 0;
errout_with_fd:
close(priv->fd);
errout:
priv->initialized = false;
exit(EXIT_FAILURE);
}
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