+++ /dev/null
-/**
- * \file
- * <!--
- * This file is part of BeRTOS.
- *
- * Bertos is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * As a special exception, you may use this file as part of a free software
- * library without restriction. Specifically, if other files instantiate
- * templates or use macros or inline functions from this file, or you compile
- * this file and link it with other files to produce an executable, this
- * file does not by itself cause the resulting executable to be covered by
- * the GNU General Public License. This exception does not however
- * invalidate any other reasons why the executable file might be covered by
- * the GNU General Public License.
- *
- * Copyright 2005 Develer S.r.l. (http://www.develer.com/)
- *
- * -->
- *
- * \version $Id$
- *
- * \author Bernardo Innocenti <bernie@develer.com>
- * \author Francesco Sacchi <batt@develer.com>
- *
- * \brief Low-level timer module for AVR (implementation).
- */
-
-/*#*
- *#* $Log$
- *#* Revision 1.6 2007/06/07 14:35:12 batt
- *#* Merge from project_ks.
- *#*
- *#* Revision 1.5 2007/03/21 11:03:56 batt
- *#* Add missing support for ATMega1281.
- *#*
- *#* Revision 1.4 2006/07/19 12:56:26 bernie
- *#* Convert to new Doxygen style.
- *#*
- *#* Revision 1.3 2006/06/12 21:37:02 marco
- *#* implemented some commands (ver and sleep)
- *#*
- *#* Revision 1.2 2006/05/18 00:37:58 bernie
- *#* Don't include unneeded header hw.h.
- *#*
- *#* Revision 1.1 2005/07/19 07:28:36 bernie
- *#* Refactor to decouple timer ticks from milliseconds.
- *#*
- *#* Revision 1.1 2005/05/24 09:17:58 batt
- *#* Move drivers to top-level.
- *#*
- *#*/
-#include <drv/timer_avr.h>
-#include <cfg/macros.h> // BV()
-
-#include <cfg/cpu.h>
-
-#include <avr/interrupt.h>
-#include <avr/io.h>
-
-#if CPU_AVR_ATMEGA1281 || CPU_AVR_ATMEGA168
- #define REG_TIFR0 TIFR0
- #define REG_TIFR2 TIFR2
-
- #define REG_TIMSK0 TIMSK0
- #define REG_TIMSK2 TIMSK2
-
- #define REG_TCCR2A TCCR2A
- #define REG_TCCR2B TCCR2B
-
- #define REG_OCR2A OCR2A
-
- #define BIT_OCF0A OCF0A
- #define BIT_OCF2A OCF2A
-
- #define BIT_OCIE0A OCIE0A
- #define BIT_OCIE2A OCIE2A
-#else
- #define REG_TIFR0 TIFR
- #define REG_TIFR2 TIFR
-
- #define REG_TIMSK0 TIMSK
- #define REG_TIMSK2 TIMSK
-
- #define REG_TCCR2A TCCR2
- #define REG_TCCR2B TCCR2
-
- #define REG_OCR2A OCR2
-
- #define BIT_OCF0A OCF0
- #define BIT_OCF2A OCF2
-
- #define BIT_OCIE0A OCIE0
- #define BIT_OCIE2A OCIE2
-#endif
-
-
-/** HW dependent timer initialization */
-#if (CONFIG_TIMER == TIMER_ON_OUTPUT_COMPARE0)
-
- static void timer_hw_init(void)
- {
- cpuflags_t flags;
- IRQ_SAVE_DISABLE(flags);
-
- /* Reset Timer flags */
- REG_TIFR0 = BV(BIT_OCF0A) | BV(TOV0);
-
- /* Setup Timer/Counter interrupt */
- ASSR = 0x00; /* Internal system clock */
- TCCR0 = BV(WGM01) /* Clear on Compare match */
- #if TIMER_PRESCALER == 64
- | BV(CS02)
- #else
- #error Unsupported value of TIMER_PRESCALER
- #endif
- ;
- TCNT0 = 0x00; /* Initialization of Timer/Counter */
- OCR0 = OCR_DIVISOR; /* Timer/Counter Output Compare Register */
-
- /* Enable timer interrupts: Timer/Counter2 Output Compare (OCIE2) */
- REG_TIMSK0 &= ~BV(TOIE0);
- REG_TIMSK0 |= BV(OCIE0);
-
- IRQ_RESTORE(flags);
- }
-
- INLINE hptime_t timer_hw_hpread(void)
- {
- return TCNT0;
- }
-
-#elif (CONFIG_TIMER == TIMER_ON_OVERFLOW1)
-
- static void timer_hw_init(void)
- {
- cpuflags_t flags;
- IRQ_SAVE_DISABLE(flags);
-
- /* Reset Timer overflow flag */
- TIFR |= BV(TOV1);
-
- /* Fast PWM mode, 9 bit, 24 kHz, no prescaling. */
- #if (TIMER_PRESCALER == 1) && (TIMER_HW_BITS == 9)
- TCCR1A |= BV(WGM11);
- TCCR1A &= ~BV(WGM10);
- TCCR1B |= BV(WGM12) | BV(CS10);
- TCCR1B &= ~(BV(WGM13) | BV(CS11) | BV(CS12));
- /* Fast PWM mode, 8 bit, 24 kHz, no prescaling. */
- #elif (TIMER_PRESCALER == 1) && (TIMER_HW_BITS == 8)
- TCCR1A |= BV(WGM10);
- TCCR1A &= ~BV(WGM11);
- TCCR1B |= BV(WGM12) | BV(CS10);
- TCCR1B &= ~(BV(WGM13) | BV(CS11) | BV(CS12));
- #else
- #error Unsupported value of TIMER_PRESCALER or TIMER_HW_BITS
- #endif
-
- TCNT1 = 0x00; /* initialization of Timer/Counter */
-
- /* Enable timer interrupt: Timer/Counter1 Overflow */
- TIMSK |= BV(TOIE1);
-
- IRQ_RESTORE(flags);
- }
-
- INLINE hptime_t timer_hw_hpread(void)
- {
- return TCNT1;
- }
-
-#elif (CONFIG_TIMER == TIMER_ON_OUTPUT_COMPARE2)
- static void timer_hw_init(void)
- {
- cpuflags_t flags;
- IRQ_SAVE_DISABLE(flags);
-
- /* Reset Timer flags */
- REG_TIFR2 = BV(BIT_OCF2A) | BV(TOV2);
-
- /* Setup Timer/Counter interrupt */
- REG_TCCR2A = 0; // TCCR2 reg could be separate or a unique register with both A & B values, this is needed to
- REG_TCCR2B = 0; // ensure correct initialization.
-
- REG_TCCR2A = BV(WGM21);
- #if TIMER_PRESCALER == 64
- #if CPU_AVR_ATMEGA1281 || CPU_AVR_ATMEGA168
- // ATMega1281 & ATMega168 have undocumented differences in timer2 prescaler!
- REG_TCCR2B |= BV(CS22);
- #else
- REG_TCCR2B |= BV(CS21) | BV(CS20);
- #endif
- #else
- #error Unsupported value of TIMER_PRESCALER
- #endif
-
- /* Clear on Compare match & prescaler = 64, internal sys clock.
- When changing prescaler change TIMER_HW_HPTICKS_PER_SEC too */
- TCNT2 = 0x00; /* initialization of Timer/Counter */
- REG_OCR2A = OCR_DIVISOR; /* Timer/Counter Output Compare Register */
-
- /* Enable timer interrupts: Timer/Counter2 Output Compare (OCIE2) */
- REG_TIMSK2 &= ~BV(TOIE2);
- REG_TIMSK2 |= BV(BIT_OCIE2A);
-
- IRQ_RESTORE(flags);
- }
-
- INLINE hptime_t timer_hw_hpread(void)
- {
- return TCNT2;
- }
-#elif (CONFIG_TIMER == TIMER_ON_OVERFLOW3)
-
- static void timer_hw_init(void)
- {
- cpuflags_t flags;
- IRQ_SAVE_DISABLE(flags);
-
- /* Reset Timer overflow flag */
- TIFR |= BV(TOV3);
-
- /* Fast PWM mode, 9 bit, 24 kHz, no prescaling. */
- #if (TIMER_PRESCALER == 1) && (TIMER_HW_BITS == 9)
- TCCR3A |= BV(WGM31);
- TCCR3A &= ~BV(WGM30);
- TCCR3B |= BV(WGM32) | BV(CS30);
- TCCR3B &= ~(BV(WGM33) | BV(CS31) | BV(CS32));
- /* Fast PWM mode, 8 bit, 24 kHz, no prescaling. */
- #elif (TIMER_PRESCALER == 1) && (TIMER_HW_BITS == 8)
- TCCR3A |= BV(WGM30);
- TCCR3A &= ~BV(WGM31);
- TCCR3B |= BV(WGM32) | BV(CS30);
- TCCR3B &= ~(BV(WGM33) | BV(CS31) | BV(CS32));
- #else
- #error Unsupported value of TIMER_PRESCALER or TIMER_HW_BITS
- #endif
-
- TCNT3 = 0x00; /* initialization of Timer/Counter */
-
- /* Enable timer interrupt: Timer/Counter3 Overflow */
- /* ATTENTION! TOIE3 is only on ETIMSK, not TIMSK */
- ETIMSK |= BV(TOIE3);
-
- IRQ_RESTORE(flags);
- }
-
- INLINE hptime_t timer_hw_hpread(void)
- {
- return TCNT3;
- }
-
-#else
- #error Unimplemented value for CONFIG_TIMER
-#endif /* CONFIG_TIMER */
-
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