/*
* FreeModbus Libary: BARE Port
* Copyright (C) 2006 Christian Walter <wolti@sil.at>
*
* 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 <stm32f10x.h>
#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();
}
}
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