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) 2014-2017, 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