104 lines
4.1 KiB
C
104 lines
4.1 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2014 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file AVR/hal_lld.c
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* @brief AVR HAL subsystem low level driver code.
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*
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* @addtogroup HAL
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* @{
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*/
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#include "hal.h"
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/**
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* @brief Timer0 interrupt handler.
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*/
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OSAL_IRQ_HANDLER(AVR_TIMER_VECT) {
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OSAL_IRQ_PROLOGUE();
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osalSysLockFromISR();
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osalOsTimerHandlerI();
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osalSysUnlockFromISR();
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OSAL_IRQ_EPILOGUE();
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}
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level HAL driver initialization.
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*
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* @notapi
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*/
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void hal_lld_init(void) {
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/*
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* Timer 0 setup.
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*/
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#if defined(TCCR0B) /* Timer has multiple output comparators */
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TCCR0A = (1 << WGM01) | (0 << WGM00) | /* CTC mode. */
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(0 << COM0A1) | (0 << COM0A0) | /* OC0A disabled. */
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(0 << COM0B1) | (0 << COM0B0); /* OC0B disabled. */
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TCCR0B = (0 << WGM02) | AVR_TIMER_PRESCALER_BITS; /* CTC mode. */
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OCR0A = AVR_TIMER_COUNTER - 1;
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TCNT0 = 0; /* Reset counter. */
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TIFR0 = (1 << OCF0A); /* Reset pending. */
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TIMSK0 = (1 << OCIE0A); /* IRQ on compare. */
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#elif defined(TCCR0A) /* AT90CAN doesn't have TCCR0B and slightly different TCCR0A */
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TCCR0A = (1 << WGM01) | (0 << WGM00) | /* CTC mode. */
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(0 << COM0A1) | (0 << COM0A0); /* OC0A disabled. */
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OCR0A = AVR_TIMER_COUNTER - 1;
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TCNT0 = 0; /* Reset counter. */
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TIFR0 = (1 << OCF0A); /* Reset pending. */
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TIMSK0 = (1 << OCIE0A); /* IRQ on compare. */
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#elif defined(TCCR0) /* Timer has single output comparator */
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TCCR0 = (1 << WGM01) | (0 << WGM00) | /* CTC mode. */
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(0 << COM01) | (0 << COM00) | /* OC0A disabled. */
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AVR_TIMER_PRESCALER_BITS;
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OCR0 = AVR_TIMER_COUNTER - 1;
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TCNT0 = 0; /* Reset counter. */
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TIFR = (1 << OCF0); /* Reset pending. */
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TIMSK = (1 << OCIE0); /* IRQ on compare. */
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#else
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#error "Neither TCCR0A nor TCCR0 registers are defined"
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#endif
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}
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/** @} */
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