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Diffstat (limited to 'apps/examples/watchdog/watchdog_main.c')
-rw-r--r-- | apps/examples/watchdog/watchdog_main.c | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/apps/examples/watchdog/watchdog_main.c b/apps/examples/watchdog/watchdog_main.c new file mode 100644 index 000000000..c1341e0fb --- /dev/null +++ b/apps/examples/watchdog/watchdog_main.c @@ -0,0 +1,357 @@ +/**************************************************************************** + * examples/watchdog/watchdog_main.c + * + * Copyright (C) 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/types.h> +#include <sys/ioctl.h> + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <fcntl.h> +#include <errno.h> +#include <debug.h> + +#include <nuttx/watchdog.h> + +#include "watchdog.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +struct wdog_example_s +{ + uint32_t pingtime; + uint32_t pingdelay; + uint32_t timeout; +}; + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: wdog_help + ****************************************************************************/ + +static void wdog_help(void) +{ + message("Usage: wdog [-h] [-d <pingtime] [-p <pingdelay>] [-t <timeout>]\n"); + message("\nInitialize the watchdog to the <timeout>. Start the watchdog\n"); + message("timer. Ping for the watchdog for <pingtime> seconds, then let it expire.\n"); + message("\nOptions include:\n"); + message(" [-d <pingtime>] = Selects the <delay> time in milliseconds. Default: %d\n", + CONFIG_EXAMPLES_WATCHDOG_PINGTIME); + message(" [-p <pingdelay] = Time delay between pings in milliseconds. Default: %d\n", + CONFIG_EXAMPLES_WATCHDOG_PINGDELAY); + message(" [-t timeout] = Time in milliseconds that the example will ping the watchdog\n"); + message(" before letting the watchdog expire. Default: %d\n", + CONFIG_EXAMPLES_WATCHDOG_TIMEOUT); + message(" [-h] = Shows this message and exits\n"); +} + +/**************************************************************************** + * Name: arg_string + ****************************************************************************/ + +static int arg_string(FAR char **arg, FAR char **value) +{ + FAR char *ptr = *arg; + + if (ptr[2] == '\0') + { + *value = arg[1]; + return 2; + } + else + { + *value = &ptr[2]; + return 1; + } +} + +/**************************************************************************** + * Name: arg_decimal + ****************************************************************************/ + +static int arg_decimal(FAR char **arg, FAR long *value) +{ + FAR char *string; + int ret; + + ret = arg_string(arg, &string); + *value = strtol(string, NULL, 10); + return ret; +} + +/**************************************************************************** + * Name: parse_args + ****************************************************************************/ + +static void parse_args(FAR struct wdog_example_s *wdog, int argc, FAR char **argv) +{ + FAR char *ptr; + long value; + int index; + int nargs; + + wdog->pingtime = CONFIG_EXAMPLES_WATCHDOG_PINGTIME; + wdog->pingdelay = CONFIG_EXAMPLES_WATCHDOG_PINGDELAY; + wdog->timeout = CONFIG_EXAMPLES_WATCHDOG_TIMEOUT; + + for (index = 1; index < argc; ) + { + ptr = argv[index]; + if (ptr[0] != '-') + { + message("Invalid options format: %s\n", ptr); + exit(EXIT_SUCCESS); + } + + switch (ptr[1]) + { + case 'd': + nargs = arg_decimal(&argv[index], &value); + if (value < 1) + { + message("Ping delay out of range: %ld\n", value); + exit(EXIT_FAILURE); + } + + wdog->pingdelay = (uint32_t)value; + index += nargs; + break; + + case 'p': + nargs = arg_decimal(&argv[index], &value); + if (value < 1 || value > 99) + { + message("Ping time out of range: %ld\n", value); + exit(EXIT_FAILURE); + } + + wdog->pingtime = (uint8_t)value; + index += nargs; + break; + + case 't': + nargs = arg_decimal(&argv[index], &value); + if (value < 1 || value > INT_MAX) + { + message("Duration out of range: %ld\n", value); + exit(EXIT_FAILURE); + } + + wdog->timeout = (int)value; + index += nargs; + break; + + case 'h': + wdog_help(); + exit(EXIT_SUCCESS); + + default: + message("Unsupported option: %s\n", ptr); + wdog_help(); + exit(EXIT_FAILURE); + } + } +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: user_start/wdog_main + ****************************************************************************/ + +int wdog_main(int argc, char *argv[]) +{ + struct wdog_example_s wdog; +#ifdef CONFIG_DEBUG_WATCHDOG + struct watchdog_status_s status; +#endif + long elapsed; + int fd; + int ret; + + /* Parse the command line */ + + parse_args(&wdog, argc, argv); + + /* Initialization of the WATCHDOG hardware is performed by logic external to + * this test. + */ + + ret = up_wdginitialize(); + if (ret != OK) + { + message("wdog_main: up_wdginitialize failed: %d\n", ret); + goto errout; + } + + /* Open the watchdog device for reading */ + + fd = open(CONFIG_EXAMPLES_WATCHDOG_DEVPATH, O_RDONLY); + if (fd < 0) + { + message("wdog_main: open %s failed: %d\n", + CONFIG_EXAMPLES_WATCHDOG_DEVPATH, errno); + goto errout; + } + + /* Set the watchdog timeout */ + + ret = ioctl(fd, WDIOC_SETTIMEOUT, (unsigned long)wdog.timeout); + if (ret < 0) + { + message("wdog_main: ioctl(WDIOC_SETTIMEOUT) failed: %d\n", errno); + goto errout_with_dev; + } + + /* Then start the watchdog timer. */ + + ret = ioctl(fd, WDIOC_START, 0); + if (ret < 0) + { + message("wdog_main: ioctl(WDIOC_START) failed: %d\n", errno); + goto errout_with_dev; + } + + /* Then ping */ + + for (elapsed = 0; elapsed < wdog.pingtime; elapsed += wdog.pingdelay) + { + /* Sleep for the requested amount of time */ + + usleep(wdog.pingdelay * 1000); + + /* Show watchdog status. Only if debug is enabled because this + * could interfere with the timer. + */ + +#ifdef CONFIG_DEBUG_WATCHDOG + ret = ioctl(fd, WDIOC_GETSTATUS, (unsigned long)&status); + if (ret < 0) + { + message("wdog_main: ioctl(WDIOC_GETSTATUS) failed: %d\n", errno); + goto errout_with_dev; + } + message("wdog_main: flags=%08x timeout=%d timeleft=%d\n", + status.flags, status.timeout, status.timeleft); +#endif + + /* Then ping */ + + ret = ioctl(fd, WDIOC_KEEPALIVE, 0); + if (ret < 0) + { + message("wdog_main: ioctl(WDIOC_KEEPALIVE) failed: %d\n", errno); + goto errout_with_dev; + } + + message(" ping elapsed=%ld\n", elapsed); + msgflush(); + } + + /* Then stop pinging */ + + for (; ; elapsed += wdog.pingdelay) + { + /* Sleep for the requested amount of time */ + + usleep(wdog.pingdelay * 1000); + + /* Show watchdog status. Only if debug is enabled because this + * could interfere with the timer. + */ + +#ifdef CONFIG_DEBUG_WATCHDOG + ret = ioctl(fd, WDIOC_GETSTATUS, (unsigned long)&status); + if (ret < 0) + { + message("wdog_main: ioctl(WDIOC_GETSTATUS) failed: %d\n", errno); + goto errout_with_dev; + } + message("wdog_main: flags=%08x timeout=%d timeleft=%d\n", + status.flags, status.timeout, status.timeleft); +#endif + + message(" NO ping elapsed=%ld\n", elapsed); + msgflush(); + } + + /* We should not get here */ + + ret = ioctl(fd, WDIOC_STOP, 0); + if (ret < 0) + { + message("wdog_main: ioctl(WDIOC_STOP) failed: %d\n", errno); + goto errout_with_dev; + } + + close(fd); + msgflush(); + return OK; + +errout_with_dev: + close(fd); +errout: + msgflush(); + return ERROR; +} |