Timer

About

Start a periodic timer that writes an event to the main thread. The main thread reads the event and prints “timeout” to the standard output.

See the Timer Library Reference for more details.

Source code

/**
 * @section License
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2018, Erik Moqvist
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * This file is part of the Simba project.
 */

#include "simba.h"

#define TIMEOUT_EVENT    0x1

static struct event_t event;
static struct timer_t timer;

static void timer_cb(void *arg_p)
{
    uint32_t mask;

    mask = TIMEOUT_EVENT;
    event_write_isr(&event, &mask, sizeof(mask));
}

int main()
{
    uint32_t mask;
    struct time_t timeout;

    sys_start();
    event_init(&event);

    /* Initialize and start a periodic timer. */
    timeout.seconds = 1;
    timeout.nanoseconds = 0;
    timer_init(&timer, &timeout, timer_cb, NULL, TIMER_PERIODIC);
    timer_start(&timer);

    while (1) {
        mask = TIMEOUT_EVENT;
        event_read(&event, &mask, sizeof(mask));

        std_printf(FSTR("timeout\r\n"));
    }

    return (0);
}

The source code can also be found on Github in the examples/timer folder.

Build and run

Build and upload the application.

$ cd examples/timer
$ make -s BOARD=<board> run
timeout
timeout
timeout