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.

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