4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
25 * the GNU General Public License. This exception does not however
26 * invalidate any other reasons why the executable file might be covered by
27 * the GNU General Public License.
29 * Copyright 2005 Develer S.r.l. (http://www.develer.com/)
35 * \author Bernardo Innocenti <bernie@develer.com>
37 * \brief Low-level timer module for Qt emulator (implementation).
42 *#* Revision 1.6 2006/07/19 12:56:26 bernie
43 *#* Convert to new Doxygen style.
45 *#* Revision 1.5 2006/02/21 21:28:02 bernie
46 *#* New time handling based on TIMER_TICKS_PER_SEC to support slow timers with ticks longer than 1ms.
48 *#* Revision 1.4 2006/02/17 22:24:21 bernie
49 *#* Update POSIX timer emulator.
51 *#* Revision 1.3 2006/02/10 12:34:52 bernie
52 *#* Remove spurious EXTERN_C.
54 *#* Revision 1.2 2006/01/16 03:30:21 bernie
55 *#* Make header C++ friendly.
57 *#* Revision 1.1 2005/11/27 03:58:18 bernie
58 *#* Add POSIX timer emulator.
60 *#* Revision 1.1 2005/11/27 03:06:36 bernie
61 *#* Qt timer emulation.
65 #include <cfg/compiler.h> // hptime.t
66 #include <os/hptime.h>
68 #include <signal.h> // sigaction()
69 #include <sys/time.h> // setitimer()
70 #include <string.h> // memset()
73 // Forward declaration for the user interrupt server routine.
76 /// HW dependent timer initialization.
77 static void timer_hw_init(void)
80 memset(&sa, 0, sizeof(sa));
82 // Setup interrupt callback
83 sa.sa_handler = timer_isr;
84 sigemptyset(&sa.sa_mask);
85 sigaddset(&sa.sa_mask, SIGALRM);
86 sa.sa_flags = SA_RESTART;
87 sigaction(SIGALRM, &sa, NULL);
89 // Setup POSIX realtime timer to interrupt every 1/TIMER_TICKS_PER_SEC.
90 static struct itimerval itv =
92 { 0, 1000000 / TIMER_TICKS_PER_SEC }, /* it_interval */
93 { 0, 1000000 / TIMER_TICKS_PER_SEC } /* it_value */
95 setitimer(ITIMER_REAL, &itv, NULL);
98 INLINE hptime_t timer_hw_hpread(void)