135 lines
4.8 KiB
C
135 lines
4.8 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 2003, 2004, 2005, 2010 Develer S.r.l. (http://www.develer.com/)
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* Copyright 2000 Bernie Innocenti <bernie@codewiz.org>
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* Copyright 2011 Onno <developer@gorgoz.org>
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*
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* -->
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*
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* \brief Low-level timer module for AVR XMEGA (interface).
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*
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* This file is heavily inspired by the AVR implementation for BeRTOS,
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* but uses a different approach for implementing the different debug
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* ports, by using the timer structs.
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*
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* \author Onno <developer@gorgoz.org>
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*
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*/
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#ifndef DRV_TIMER_XMEGA_H
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#define DRV_TIMER_XMEGA_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> /* DIV_ROUND */
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#include <avr/io.h>
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#include <avr/interrupt.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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* $WIZ$ timer_select = "TIMER_USE_TCC0", "TIMER_USE_TCC1", "TIMER_USE_TCD0", "TIMER_USE_TCE0", "TIMER_USE_TCD1", "TIMER_DEFAULT"
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*/
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#define TIMER_USE_TCC0 1
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#define TIMER_USE_TCC1 2
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#define TIMER_USE_TCD0 3
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#define TIMER_USE_TCE0 4
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// The XMEGA A Family has one extra timer
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#ifdef CPU_AVR_XMEGA_A
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#define TIMER_USE_TCD1 5
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#endif
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#define TIMER_DEFAULT TIMER_USE_TCC1 ///< 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 == TIMER_USE_TCC0)
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#define TIMER_OVF_VECT TCC0_OVF_vect
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#define TIMERCOUNTER TCC0
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#elif (CONFIG_TIMER == TIMER_USE_TCC1)
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#define TIMER_OVF_VECT TCC1_OVF_vect
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#define TIMERCOUNTER TCC1
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#elif (CONFIG_TIMER == TIMER_USE_TCD0)
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#define TIMER_OVF_VECT TCD0_OVF_vect
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#define TIMERCOUNTER TCD0
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#elif (CONFIG_TIMER == TIMER_USE_TCE0)
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#define TIMER_OVF_VECT TCE0_OVF_vect
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#define TIMERCOUNTER TCE0
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#elif (CONFIG_TIMER == TIMER_USE_TCD1)
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#define TIMER_OVF_VECT TCD1_OVF_vect
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#define TIMERCOUNTER TCD1
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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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//define the Interrupt Service Routine for this Timer Mode
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#define DEFINE_TIMER_ISR DECLARE_ISR_CONTEXT_SWITCH(TIMER_OVF_VECT)
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//define the Ticks per second we want
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#define TIMER_TICKS_PER_SEC 1000
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//define the Prescaler to use, which is dependend on the amount
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//of ticks per second, the maximum value for the TOP value of the
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//timer (0xFFFF) and the clock frequency.
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//The maximum clock frequency is 32Mhz, so as long as the TIMER_TICKS_PER_SEC
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//is larger then (about) 500 no prescaler is required.
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#define TIMER_PRESCALER 1
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//define the TOP/PERIOD value
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#define TIMER_PERIOD_VALUE DIV_ROUND(DIV_ROUND(CPU_FREQ, TIMER_PRESCALER), TIMER_TICKS_PER_SEC)
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//check if the TIMER_PRESCALER is large enough to accomate for the TIMER_TICKS_PER_SEC
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#if TIMER_PERIOD_VALUE > 0xFFFF
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#error Timer cannot generate the required Ticks per second, please adjust TIMER_PRESCALER
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#endif
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//define TIMER_HW_CNT it is used by the timer.c module to determine the 'edge' of the hardware counter
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#define TIMER_HW_CNT TIMER_PERIOD_VALUE
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/** Frequency of the hardware high precision timer. */
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#define TIMER_HW_HPTICKS_PER_SEC DIV_ROUND(CPU_FREQ, TIMER_PRESCALER)
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// Type of time expressed in ticks of the hardware high-precision timer
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typedef uint16_t hptime_t;
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#define SIZEOF_HPTIME_T 2
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INLINE hptime_t timer_hw_hpread(void)
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{
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return (TIMERCOUNTER).CNT;
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}
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/* Not needed, IRQ timer flag cleared automatically */
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#define timer_hw_irq() do {} while (0)
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/* Not needed, timer IRQ handler called only for timer source */
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#define timer_hw_triggered() (true)
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void timer_hw_init(void);
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#endif /* DRV_TIMER_XMEGA_H */
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