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Diffstat (limited to 'apps/examples/touchscreen/tc_main.c')
-rw-r--r-- | apps/examples/touchscreen/tc_main.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/apps/examples/touchscreen/tc_main.c b/apps/examples/touchscreen/tc_main.c new file mode 100644 index 000000000..79b6b65a3 --- /dev/null +++ b/apps/examples/touchscreen/tc_main.c @@ -0,0 +1,208 @@ +/**************************************************************************** + * examples/touchscreen/tc_main.c + * + * Copyright (C) 2011 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/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; +} |