/*
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* FreeModbus Libary: BARE Port
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* Copyright (C) 2006 Christian Walter <wolti@sil.at>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; 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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* File: $Id: porttimer.c,v 1.1 2006/08/22 21:35:13 wolti Exp $
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*/
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/* ----------------------- Platform includes --------------------------------*/
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#include "port.h"
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/* ----------------------- Modbus includes ----------------------------------*/
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#include "mb.h"
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#include "mbport.h"
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/* ----------------------- static functions ---------------------------------*/
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static void prvvTIMERExpiredISR(void);
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/* ----------------------- Start implementation -----------------------------*/
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/**
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* @brief TIM4³õʼ»¯
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* @param ÎÞ
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* @retval ״̬±êÖ¾
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*/
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BOOL xMBPortTimersInit( USHORT usTim1Timerout50us )
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{
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u16 PrescalerValue;
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TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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NVIC_InitTypeDef NVIC_InitStructure;
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//´ò¿ªTIM4ʱÖÓ
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
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//TIM4·ÖƵϵÊýΪ3599,ʱ»ùƵÂÊΪ72 / (1 + Prescaler) = 20KHz,»ù׼Ϊ50us
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PrescalerValue = (u16) (SystemCoreClock / 20000) - 1;
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//TIM4³õʼ»¯
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TIM_TimeBaseStructure.TIM_Period = (u16) usTim1Timerout50us;
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TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
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TIM_TimeBaseStructure.TIM_ClockDivision = 0;
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TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
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TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
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//ʹÄÜTIM4ԤװÔØ
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TIM_ARRPreloadConfig(TIM4, ENABLE);
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//TIM4ÖжÏÅäÖÃ
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
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NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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//Çå³ý¸üÐÂÖжϱêÖ¾
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TIM_ClearITPendingBit(TIM4,TIM_IT_Update);
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//ʧÄÜTIM4¸üÐÂÖжÏ
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TIM_ITConfig(TIM4, TIM_IT_Update, DISABLE);
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//¹Ø±ÕTIM4¶¨Ê±Æ÷
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TIM_Cmd(TIM4, DISABLE);
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return TRUE;
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}
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/**
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* @brief ¿ªÆôTIM4
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* @param ÎÞ
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* @retval ÎÞ
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*/
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void vMBPortTimersEnable(void)
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{
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/* Enable the timer with the timeout passed to xMBPortTimersInit( ) */
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//Çå³ý¸üÐÂÖжϱêÖ¾
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TIM_ClearITPendingBit(TIM4,TIM_IT_Update);
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//ÔÊÐíTIM4¸üÐÂÖжÏ
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TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE);
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//½«TIM4¼ÆÊýÖµÇåÁã
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TIM_SetCounter(TIM4,0);
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//¿ªÆôTIM4¶¨Ê±Æ÷
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TIM_Cmd(TIM4,ENABLE);
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}
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/**
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* @brief ¹Ø±ÕTIM4
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* @param ÎÞ
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* @retval ÎÞ
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*/
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void vMBPortTimersDisable(void)
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{
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/* Disable any pending timers. */
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//Çå³ý¸üÐÂÖжϱêÖ¾
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TIM_ClearITPendingBit(TIM4,TIM_IT_Update);
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//½ûÖ¹TIM4¸üÐÂÖжÏ
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TIM_ITConfig(TIM4,TIM_IT_Update,DISABLE);
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//½«TIM4¼ÆÊýÖµÇåÁã
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TIM_SetCounter(TIM4,0);
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//¹Ø±ÕTIM4¶¨Ê±Æ÷
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TIM_Cmd(TIM4,DISABLE);
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}
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/* Create an ISR which is called whenever the timer has expired. This function
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* must then call pxMBPortCBTimerExpired( ) to notify the protocol stack that
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* the timer has expired.
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*/
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static void prvvTIMERExpiredISR(void)
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{
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(void)pxMBPortCBTimerExpired();
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}
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/**
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* @brief TIM4ÖжϺ¯Êý
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* @param ÎÞ
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* @retval ÎÞ
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*/
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void TIM4_IRQHandler(void)
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{
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//ÊÇ·ñ·¢ËÍTIM4¸üÐÂÖжÏ
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if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)
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{
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//Çå³ýTIM4¸üÐÂÖжϱêÖ¾
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TIM_ClearITPendingBit(TIM4, TIM_IT_Update);
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prvvTIMERExpiredISR( );
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}
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}
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