FreeRTOS+FreeModbus+STM32F107VC

代码说明：

/*  * FreeModbus Libary: BARE Port  * Copyright (C) 2006 Christian Walter  *  * 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 2006/08/22 21:35:13 wolti Exp $  */ /* ----------------------- Platform includes --------------------------------*/ #include #include "port.h" /* ----------------------- Modbus includes ----------------------------------*/ #include "mb.h" #include "mbport.h" /* ----------------------- static functions ---------------------------------*/ static void prvvTIMERExpiredISR( void ); /* ----------------------- Start implementation -----------------------------*/ BOOL xMBPortTimersInit( USHORT usTim1Timerout50us ) { NVIC_InitTypeDef NVIC_InitStructure; TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure; USHORT PrescalerValue = 0;     NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);     /* Enable the TIM5 gloabal Interrupt */     NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;     NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;     NVIC_Init(&NVIC_InitStructure);     /* TIM5 clock enable */     RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); PrescalerValue = (USHORT) (SystemCoreClock / 20000) - 1;      TIM_TimeBaseStructure.TIM_Period = usTim1Timerout50us;     TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;     TIM_TimeBaseStructure.TIM_ClockDivision = 0;     TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;     TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure);     TIM_ClearITPendingBit(TIM5, TIM_IT_Update);     //TIM_ITConfig(TIM5, TIM_IT_Update, DISABLE);     //TIM_Cmd(TIM5, ENABLE);      return TRUE; } void vMBPortTimersEnable( void ) {     /* Enable the timer with the timeout passed to xMBPortTimersInit( ) */     ENTER_CRITICAL_SECTION(); TIM_ClearITPendingBit(TIM5, TIM_IT_Update);     TIM_ITConfig(TIM5, TIM_IT_Update, ENABLE); TIM_SetCounter(TIM5, 0x0000);     TIM_Cmd(TIM5, ENABLE); EXIT_CRITICAL_SECTION(); } void vMBPortTimersDisable( void ) {     /* Disable any pending timers. */     ENTER_CRITICAL_SECTION(); TIM_ClearITPendingBit(TIM5, TIM_IT_Update);     TIM_ITConfig(TIM5, TIM_IT_Update, DISABLE); TIM_SetCounter(TIM5, 0x0000);     TIM_Cmd(TIM5, DISABLE); EXIT_CRITICAL_SECTION(); } /* 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.  */ static void prvvTIMERExpiredISR( void ) {     ( void )pxMBPortCBTimerExpired(  ); } void TIM5_IRQHandler(void) { if (TIM_GetITStatus(TIM5, TIM_IT_Update) == SET) { TIM_ClearITPendingBit(TIM5, TIM_IT_Update); prvvTIMERExpiredISR(); } }