127 lines
4.5 KiB
C
127 lines
4.5 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 2005, 2010 Develer S.r.l. (http://www.develer.com/)
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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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* \author Onno <developer@gorgoz.org>
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*
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* \brief Low-level timer module for AVR XMEGA (implementation).
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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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* This module is automatically included so no need to include
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* in test list.
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* notest: all
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*/
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#include <drv/timer_xmega.h>
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#include <cfg/macros.h> // BV()
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#include <cpu/types.h>
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#include <cpu/irq.h>
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#include <avr/io.h>
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/* Helper MACROS taken from the Atmel examples and altered
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*
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* The AVR XMEGA has different structures for TC0 and TC1,
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* however these only differ in the amount of compare/capture
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* channels, so for this purpose they can be used exactly the same
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*/
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//check if the bitvalues of the TC0 and TC1 Timer/Counters are really the same
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#if TC0_CLKSEL_gm != TC1_CLKSEL_gm || TC0_WGMODE_gm != TC1_WGMODE_gm || TC0_OVFINTLVL_gm != TC1_OVFINTLVL_gm
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#error TC0 and TC1 Timer/Counters cannot be configured with the same bitvalues
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#endif
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#define TIMER_CONFIG_CLOCK_SOURCE(_clkSel)\
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((TIMERCOUNTER).CTRLA = ((TIMERCOUNTER).CTRLA & ~TC0_CLKSEL_gm) | _clkSel)
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#define TIMER_CLEAR_FLAGS() ((TIMERCOUNTER).INTFLAGS = 0xFF)
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#define TIMER_SET_PERIOD( _period ) ( (TIMERCOUNTER).PER = (_period) )
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#define TIMER_SET_OVERFLOW_INTERRUPT_LEVEL( _interruptLevel )\
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((TIMERCOUNTER).INTCTRLA = ( (TIMERCOUNTER).INTCTRLA & ~TC0_OVFINTLVL_gm ) | _interruptLevel)
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#define TIMER_CONFIG_WGM(_wgm)\
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((TIMERCOUNTER).CTRLB = ( (TIMERCOUNTER).CTRLB & ~TC0_WGMODE_gm ) | _wgm)
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#define TIMER_RESET() ( (TIMERCOUNTER).CTRLFSET = TC_CMD_RESET_gc )
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//Define TIMER_PRESCALE_REG_VALUE bases on the provided
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//TIMER_PRESCALER value
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#if TIMER_PRESCALER == 0
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#define TIMER_CLKSEL_gc TC_CLKSEL_OFF_gc
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#elif TIMER_PRESCALER == 1
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#define TIMER_CLKSEL_gc TC_CLKSEL_DIV1_gc
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#elif TIMER_PRESCALER == 2
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#define TIMER_CLKSEL_gc TC_CLKSEL_DIV2_gc
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#elif TIMER_PRESCALER == 4
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#define TIMER_CLKSEL_gc TC_CLKSEL_DIV4_gc
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#elif TIMER_PRESCALER == 16
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#define TIMER_CLKSEL_gc TC_CLKSEL_DIV16_gc
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#elif TIMER_PRESCALER == 64
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#define TIMER_CLKSEL_gc TC_CLKSEL_DIV64_gc
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#elif TIMER_PRESCALER == 256
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#define TIMER_CLKSEL_gc TC_CLKSEL_DIV256_gc
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#elif TIMER_PRESCALER == 1024
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#define TIMER_CLKSEL_gc TC_CLKSEL_DIV1024_gc
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#else
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#error Invalid value for TIMER_PRESCALER has been defined! Using default of 1
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#define TIMER_CLKSEL_gc TC_CLKSEL_DIV1_gc
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#endif
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void timer_hw_init(void)
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{
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//Save and disable IRQ
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cpu_flags_t flags;
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IRQ_SAVE_DISABLE(flags);
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//disable the timer
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TIMER_CONFIG_CLOCK_SOURCE(TC_CLKSEL_OFF_gc);
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//clear all flags
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TIMER_CLEAR_FLAGS();
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//setup the Periode register value
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//CNT register will be reset to 0 when CNT == PER
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TIMER_SET_PERIOD(TIMER_PERIOD_VALUE);
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//set the Waveform Generation Mode to Normal
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TIMER_CONFIG_WGM(TC_WGMODE_NORMAL_gc);
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//enable the overflow interrupt
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//use the highest priority
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TIMER_SET_OVERFLOW_INTERRUPT_LEVEL(TC_OVFINTLVL_HI_gc);
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//enable timer by setting the correct prescaler/clock
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TIMER_CONFIG_CLOCK_SOURCE(TIMER_CLKSEL_gc);
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//Restore IRQ
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IRQ_RESTORE(flags);
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}
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