104 lines
3.0 KiB
C
104 lines
3.0 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 2010 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 NXP LPC2xxx (interface).
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*/
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#ifndef DRV_LPC2_TIMER_H
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#define DRV_LPC2_TIMER_H
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#include <hw/hw_cpufreq.h> /* CPU_FREQ */
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#include "cfg/cfg_timer.h" /* CONFIG_TIMER */
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#include <cfg/compiler.h> /* uint8_t */
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#include <cfg/macros.h> /* BV */
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#include <io/lpc23xx.h>
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/**
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* \name Values for CONFIG_TIMER.
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*
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* Select which hardware timer interrupt to use for system clock and softtimers.
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*
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* $WIZ$ timer_select = "TIMER0_COMPARE0", "TIMER_DEFAULT"
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*/
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#define TIMER0_COMPARE0 0 ///< System timer on Timer0 Compare match0
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#define TIMER_DEFAULT TIMER0_COMPARE0 ///< Default system timer
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/*
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* Hardware dependent timer initialization.
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*/
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#if (CONFIG_TIMER == TIMER0_COMPARE0)
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ISR_PROTO_CONTEXT_SWITCH(timer_handler);
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#define DEFINE_TIMER_ISR DECLARE_ISR_CONTEXT_SWITCH(timer_handler)
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#define TIMER_TICKS_PER_SEC 1000
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#define TIMER_HW_CNT (CPU_FREQ / TIMER_TICKS_PER_SEC - 1)
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/** Frequency of the hardware high-precision timer. */
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#define TIMER_HW_HPTICKS_PER_SEC (CPU_FREQ)
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/** Type of time expressed in ticks of the hardware high-precision timer */
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typedef uint32_t hptime_t;
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#define SIZEOF_HPTIME_T 4
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INLINE void timer_hw_irq(void)
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{
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/* Reset The match0 irq flag */
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T0IR = 0x01;
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/* Signal the VIC we have completed the ISR */
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VICVectAddr = 0;
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}
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INLINE bool timer_hw_triggered(void)
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{
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return true;
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}
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INLINE hptime_t timer_hw_hpread(void)
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{
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return T0TC;
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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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void timer_hw_init(void);
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#endif /* DRV_LPC2_TIMER_H */
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