dsp281x_ev.c

来自「TI TMS320F2812 ecap 例程」· C语言 代码 · 共 50 行

// TI File $Revision: /main/2 $
// Checkin $Date: April 29, 2005   11:10:23 $
//###########################################################################
//
// FILE:	DSP281x_Ev.c
//
// TITLE:	DSP281x Event Manager Initialization & Support Functions.
//
//###########################################################################
// $TI Release: DSP281x Header Files V1.11 $
// $Release Date: September 26, 2007 $
//###########################################################################

#include "DSP281x_Device.h"     // DSP281x Headerfile Include File
#include "DSP281x_Examples.h"   // DSP281x Examples Include File

//---------------------------------------------------------------------------
// InitEv: 
//---------------------------------------------------------------------------
// This function initializes to a known state.
//
void InitEv(void)
{
   //初始化 EVA 定时器2：
 
   EvaRegs.T2PR = 0xFFFF;
   EvaRegs.T2CMPR = 0x3D09;
   EvaRegs.T2CNT = 0x0000;
   EvaRegs.T2CON.all = 0x1242;      // 递增计数模式，内核时钟 4 分频得 6.25MHz
   EvaRegs.CAPCONA.all = 0x3044;    // 使能捕获单元 1,3，使用定时器 2，检测上升沿


   EvaRegs.CAPFIFOA.bit.CAP1FIFO = 0;  //写CAP1和CAP3的状态寄存器，指示FIFO中为空
   EvaRegs.CAPFIFOA.bit.CAP3FIFO = 0;

   EvaRegs.EVAIFRB.bit.T2OFINT = 1;    //清定时器2溢出中断标志并使能中断
   EvaRegs.EVAIMRB.bit.T2OFINT = 1;
      
   EvaRegs.EVAIFRC.bit.CAP1INT = 1;    //清CAP1和CAP3中断标志
   EvaRegs.EVAIFRC.bit.CAP3INT = 1;
   
   EvaRegs.EVAIMRC.bit.CAP1INT = 1;    //使能CAP1中断和CAP3中断
   EvaRegs.EVAIMRC.bit.CAP3INT = 1;

}	
	
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