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¶
/**
* @file main.c
*
* @section License
* Copyright (C) 2015-2016, Erik Moqvist
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* 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