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81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2007 Develer S.r.l. (http://www.develer.com/)
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*
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* -->
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*
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* \author Francesco Sacchi <batt@develer.com>
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*
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* \brief Low-level timer module for Atmel AT91 (inplementation).
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*/
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#include "timer_at91.h"
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#include <io/arm.h>
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#include "sysirq_at91.h"
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#include <cfg/macros.h> // BV()
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#include <cfg/module.h>
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#include <cpu/irq.h>
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#include <cpu/types.h>
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/** HW dependent timer initialization */
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#if (CONFIG_TIMER == TIMER_ON_PIT)
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ISR_PROTO_CONTEXT_SWITCH(timer_handler);
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void timer_hw_init(void)
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{
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sysirq_init();
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cpu_flags_t flags;
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MOD_CHECK(sysirq);
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IRQ_SAVE_DISABLE(flags);
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PIT_MR = TIMER_HW_CNT;
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/* Register system interrupt handler. */
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sysirq_setHandler(SYSIRQ_PIT, timer_handler);
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/* Enable interval timer and interval timer interrupts */
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PIT_MR |= BV(PITEN);
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sysirq_setEnable(SYSIRQ_PIT, true);
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/* Reset counters, this is needed to start timer and interrupt flags */
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uint32_t dummy = PIVR;
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(void) dummy;
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IRQ_RESTORE(flags);
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}
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#else
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#error Unimplemented value for CONFIG_TIMER
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#endif /* CONFIG_TIMER */
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