porttimer.c
3.64 KB
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/*
* FreeModbus Libary: LPC214X Port
* Copyright (C) 2007 Tiago Prado Lone <tiago@maxwellbohr.com.br>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* File: $Id: porttimer.c,v 1.1 2007/04/24 23:15:18 wolti Exp $
*/
/* ----------------------- Platform includes --------------------------------*/
#include "port.h"
/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbport.h"
/* ----------------------- static functions ---------------------------------*/
void prvvTIMERExpiredISR( void );
/* ----------------------- Start implementation -----------------------------*/
_BOOL
xMBPortTimersInit( USHORT usTim1Timerout50us )
{
// return FALSE;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
uint16_t PrescalerValue = 0;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
//
//HCLK为72MHz
//时基频率72 / （1 + Prescaler) = 20KHz
//
PrescalerValue = (uint16_t)((SystemCoreClock / 20000) - 1);
//
//初始化定时器参数
//
TIM_TimeBaseStructure.TIM_Period = (uint16_t)usTim1Timerout50us;
TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
//
//使能预装
//
TIM_ARRPreloadConfig(TIM3, ENABLE);
//
//初始化中断优先级
//
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
TIM_ITConfig(TIM3, TIM_IT_Update, DISABLE);
TIM_Cmd(TIM3, DISABLE);
return TRUE;
}
void
vMBPortTimersEnable( )
{
/* Enable the timer with the timeout passed to xMBPortTimersInit( ) */
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
TIM_SetCounter(TIM3, 0x00000000);
TIM_Cmd(TIM3, ENABLE);
}
void
vMBPortTimersDisable( )
{
/* Disable any pending timers. */
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
TIM_ITConfig(TIM3, TIM_IT_Update, DISABLE);
TIM_SetCounter(TIM3, 0x00000000);
TIM_Cmd(TIM3, DISABLE);
}
/* Create an ISR which is called whenever the timer has expired. This function
* must then call pxMBPortCBTimerExpired( ) to notify the protocol stack that
* the timer has expired.
*/
void prvvTIMERExpiredISR( void )
{
( void )pxMBPortCBTimerExpired( );
}
/**
*****************************************************************************
* @Name : 定时器4中断服务函数
*
* @Brief : none
*
* @Input : none
*
* @Output : none
*
* @Return : none
*****************************************************************************
**/
void TIM3_IRQHandler(void)
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
prvvTIMERExpiredISR();
}
}