108 lines
3.6 KiB
C
108 lines
3.6 KiB
C
/*
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* FreeModbus Libary: STM32 Port
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* Copyright (C) 2013 Armink <armink.ztl@gmail.com>
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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 1.60 2013/08/13 15:07:05 Armink $
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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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BOOL xMBPortTimersInit(USHORT usTim1Timerout50us)
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{
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uint16_t PrescalerValue = 0;
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TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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NVIC_InitTypeDef NVIC_InitStructure;
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//====================================时钟初始化===========================
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//使能定时器3时钟
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
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//====================================定时器初始化===========================
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//定时器时间基配置说明
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//HCLK为72MHz，APB1经过2分频为36MHz
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//TIM3的时钟倍频后为72MHz（硬件自动倍频,达到最大）
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//TIM3的分频系数为3599，时间基频率为72 / (1 + Prescaler) = 20KHz,基准为50us
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//TIM最大计数值为usTim1Timerout50u
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PrescalerValue = (uint16_t) (SystemCoreClock / 20000) - 1;
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//定时器1初始化
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TIM_TimeBaseStructure.TIM_Period = (uint16_t) 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(TIM3, &TIM_TimeBaseStructure);
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//预装载使能
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TIM_ARRPreloadConfig(TIM3, ENABLE);
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//====================================中断初始化===========================
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//设置NVIC优先级分组为Group2：0-3抢占式优先级，0-3的响应式优先级
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
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NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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//清除溢出中断标志位
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TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
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//定时器3溢出中断关闭
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TIM_ITConfig(TIM3, TIM_IT_Update, DISABLE);
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//定时器3禁能
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TIM_Cmd(TIM3, DISABLE);
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return TRUE;
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}
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void vMBPortTimersEnable()
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{
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TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
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TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
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TIM_SetCounter(TIM3, 0);
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TIM_Cmd(TIM3, ENABLE);
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}
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void vMBPortTimersDisable()
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{
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TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
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TIM_ITConfig(TIM3, TIM_IT_Update, DISABLE);
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TIM_SetCounter(TIM3, 0);
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TIM_Cmd(TIM3, DISABLE);
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}
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void prvvTIMERExpiredISR(void)
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{
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(void) pxMBPortCBTimerExpired();
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}
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void TIM3_IRQHandler(void)
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{
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rt_interrupt_enter();
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if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
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{
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TIM_ClearFlag(TIM3, TIM_FLAG_Update); //清中断标记
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TIM_ClearITPendingBit(TIM3, TIM_IT_Update); //清除定时器T3溢出中断标志位
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prvvTIMERExpiredISR();
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}
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rt_interrupt_leave();
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}
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