/******************************************************
**描述:用CAP2對脈沖的上升沿進(jìn)行捕獲，再計(jì)算脈沖寬度**
******************************************************/
#include "DSP28_Device.h"
Uint16 temp;

void CAP2init()
{
     EvaRegs.GPTCONA.all=0x0000;
     EvaRegs.CAP2FBOT=0x0000;
     EvaRegs.CAP2FIFO=0x0000;
     EvaRegs.CAPFIFO.all=0x0000;
     EvaRegs.T1PR=0xffff;
     EvaRegs.T1CNT=0x0000;
     EvaRegs.CAPCON.all=0x0210;  //捕獲單元2為檢測上升沿，選擇Timer1為時鐘
     EvaRegs.T1CON.all = 0xf74c;   //Timer1 為連續(xù)增,預(yù)分頻系數(shù)為128 
}   
void IOinit()
{
   	 EALLOW;		
   	 GpioMuxRegs.GPAMUX.bit.CAP2Q2_GPIOA9 =1; //使能 CAP2 引腳
   	 EDIS;
}

main(void) 
{
    InitSysCtrl();              //系統(tǒng)初始化
   	DINT;                   //禁止和清除所有CPU中斷
	IER = 0x0000;
	IFR = 0x0000;
    IOinit();
	CAP2init();
	EvaRegs.T1CNT=0x0000;
	EvaRegs.CAPCON.bit.CAPQEPN=1;
    while (1)
    {
	 if((EvaRegs.CAPFIFO.bit.CAP2FIFO)==2)
        temp=EvaRegs.CAP2FBOT-EvaRegs.CAP2FIFO;
	}
}