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 2007 Develer S.r.l. (http://www.develer.com/)
35 * \author Francesco Sacchi <batt@develer.com>
37 * \brief Low-level timer module for Atmel AT91 (inplementation).
40 #include "timer_at91.h"
42 #include "sysirq_at91.h"
44 #include <cfg/macros.h> // BV()
45 #include <cfg/module.h>
49 /** HW dependent timer initialization */
50 #if (CONFIG_TIMER == TIMER_ON_PIT)
51 INLINE void timer_hw_irq(void)
53 /* Reset counters, this is needed to reset timer and interrupt flags */
54 uint32_t dummy = PIVR;
58 INLINE bool timer_hw_triggered(void)
60 return PIT_SR & BV(PITS);
63 INLINE void timer_hw_init(void)
69 IRQ_SAVE_DISABLE(flags);
71 PIT_MR = TIMER_HW_CNT;
72 /* Register system interrupt handler. */
73 sysirq_setHandler(SYSIRQ_PIT, timer_handler);
75 /* Enable interval timer and interval timer interrupts */
77 sysirq_setEnable(SYSIRQ_PIT, true);
79 /* Reset counters, this is needed to start timer and interrupt flags */
80 uint32_t dummy = PIVR;
86 INLINE hptime_t timer_hw_hpread(void)
88 /* In the upper part of PIT_PIIR there is unused data */
89 return PIIR & CPIV_MASK;
93 #error Unimplemented value for CONFIG_TIMER
94 #endif /* CONFIG_TIMER */