hpa.c

第二届飞思卡尔杯智能车大赛

/*
 * Copyright (c) 1998, Xiongfei Guo, Shanghai Second Polytechnic University 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Shanghai Second Polytechnic University nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/******************************************************************************
  hPA.c
  脉冲累加计数器
******************************************************************************/
#include "includes.h"

// 当检测到上升或下降边的时候执行的函数
void (*PAI_FUNC)(void) = NULL;

// 当PACN3溢出的时候执行的函数
void (*PAOVI_FUNC)(void) = NULL;

#pragma CODE_SEG __NEAR_SEG NON_BANKED
ISR PAI_ISR(void) {
    if (PAI_FUNC != NULL) {
        PAI_FUNC();
    }

    // 注意:要清楚标志位
    PAFLG_PAIF = 1;
}


#pragma CODE_SEG __NEAR_SEG NON_BANKED
ISR PAOVI_ISR(void) {
    if (PAOVI_FUNC != NULL) {
        PAOVI_FUNC();
    }
    PAFLG_PAIF = 1;
}


#pragma CODE_SEG DEFAULT
/* 初始化脉冲累加计数器 */
void InitPA() {
    EnableInterrupts;

    // 打开默认设置的中断
    PACTL = PACTL_DEFAULT;
}