porttimer.c
3.37 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
/*
* 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 "port.h"
/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbport.h"
#include "mbconfig.h"
#if MB_SLAVE_RTU_ENABLED > 0
/* ----------------------- static functions ---------------------------------*/
void prvvTIMERExpiredISR( void );
/* ----------------------- Start implementation -----------------------------*/
//首先移植定时器的初始化，给其50um计时一次
BOOL
xMBPortTimersInit( USHORT usTim1Timerout50us )
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
TIM_TimeBaseStructure.TIM_Period = 20;
//50um计时一次
TIM_TimeBaseStructure.TIM_Prescaler = 2100 - 1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure);
TIM_ARRPreloadConfig(TIM5, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 11; //优先级要比串口低
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_ClearITPendingBit(TIM5, TIM_IT_Update);
TIM_ITConfig(TIM5, TIM_IT_Update, DISABLE);
TIM_Cmd(TIM5, ENABLE);
return TRUE;
}
//使能定时器中断
void
vMBPortTimersEnable( )
{
/* Enable the timer with the timeout passed to xMBPortTimersInit( ) */
TIM_ClearITPendingBit(TIM5, TIM_IT_Update);
TIM_SetCounter(TIM5, 0);
//TIM_Cmd(TIM2, ENABLE);
TIM_ITConfig(TIM5, TIM_IT_Update, ENABLE);
}
//失能定时器
void
vMBPortTimersDisable( )
{
/* Disable any pending timers. */
TIM_SetCounter(TIM5, 0);
//TIM_Cmd(TIM2, DISABLE);
TIM_ITConfig(TIM5, TIM_IT_Update, 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( );
}
//定时器2 中断函数
void TIM5_IRQHandler(void)
{
CPU_SR_ALLOC();
CPU_CRITICAL_ENTER();
OSIntEnter();
CPU_CRITICAL_EXIT();
if (TIM_GetITStatus(TIM5, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM5, TIM_IT_Update);
prvvTIMERExpiredISR();
}
OSIntExit();
}
#endif