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/****************************************************************************
* examples/touchscreen/tc_main.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/input/touchscreen.h>
#include "tc.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: tc_main
****************************************************************************/
int tc_main(int argc, char *argv[])
{
struct touch_sample_s sample;
ssize_t nbytes;
#if defined(CONFIG_EXAMPLES_TOUCHSCREEN_BUILTIN) || defined(CONFIG_EXAMPLES_TOUCHSCREEN_NSAMPLES)
long nsamples;
#endif
int fd;
int errval = 0;
int ret;
/* If this example is configured as an NX add-on, then limit the number of
* samples that we collect before returning. Otherwise, we never return
*/
#if defined(CONFIG_EXAMPLES_TOUCHSCREEN_BUILTIN)
nsamples = 1;
if (argc > 1)
{
nsamples = strtol(argv[1], NULL, 10);
}
message("tc_main: nsamples: %d\n", nsamples);
#elif defined(CONFIG_EXAMPLES_TOUCHSCREEN_NSAMPLES)
message("tc_main: nsamples: %d\n", CONFIG_EXAMPLES_TOUCHSCREEN_NSAMPLES);
#endif
/* Initialization of the touchscreen hardware is performed by logic
* external to this test.
*/
message("tc_main: Initializing external touchscreen device\n");
ret = arch_tcinitialize(CONFIG_EXAMPLES_TOUCHSCREEN_MINOR);
if (ret != OK)
{
message("tc_main: arch_tcinitialize failed: %d\n", ret);
errval = 1;
goto errout;
}
/* Open the touchscreen device for reading */
message("tc_main: Opening %s\n", CONFIG_EXAMPLES_TOUCHSCREEN_DEVPATH);
fd = open(CONFIG_EXAMPLES_TOUCHSCREEN_DEVPATH, O_RDONLY);
if (fd < 0)
{
message("tc_main: open %s failed: %d\n",
CONFIG_EXAMPLES_TOUCHSCREEN_DEVPATH, errno);
errval = 2;
goto errout_with_tc;
}
/* Now loop the appropriate number of times, displaying the collected
* touchscreen samples.
*/
#if defined(CONFIG_EXAMPLES_TOUCHSCREEN_BUILTIN)
for (; nsamples > 0; nsamples--)
#elif defined(CONFIG_EXAMPLES_TOUCHSCREEN_NSAMPLES)
for (nsamples = 0; nsamples < CONFIG_EXAMPLES_TOUCHSCREEN_NSAMPLES; nsamples++)
#else
for (;;)
#endif
{
/* Flush any output before the loop entered or from the previous pass
* through the loop.
*/
msgflush();
/* Read one sample */
ivdbg("Reading...\n");
nbytes = read(fd, &sample, sizeof(struct touch_sample_s));
ivdbg("Bytes read: %d\n", nbytes);
/* Handle unexpected return values */
if (nbytes < 0)
{
errval = errno;
if (errval != EINTR)
{
message("tc_main: read %s failed: %d\n",
CONFIG_EXAMPLES_TOUCHSCREEN_DEVPATH, errval);
errval = 3;
goto errout_with_dev;
}
message("tc_main: Interrupted read...\n");
}
else if (nbytes != sizeof(struct touch_sample_s))
{
message("tc_main: Unexpected read size=%d, expected=%d, Ignoring\n",
nbytes, sizeof(struct touch_sample_s));
}
/* Print the sample data on successful return */
else
{
message("Sample :\n");
message(" npoints : %d\n", sample.npoints);
message("Point 1 :\n");
message(" id : %d\n", sample.point[0].id);
message(" flags : %02x\n", sample.point[0].flags);
message(" x : %d\n", sample.point[0].x);
message(" y : %d\n", sample.point[0].y);
message(" h : %d\n", sample.point[0].h);
message(" w : %d\n", sample.point[0].w);
message(" pressure : %d\n", sample.point[0].pressure);
}
}
errout_with_dev:
close(fd);
errout_with_tc:
arch_tcuninitialize();
errout:
message("Terminating!\n");
msgflush();
return errval;
}
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