dsp28_ev.c

实现基于TMSF2812的SPWM波形合成的程序

//
//      TMDX ALPHA RELEASE
//      Intended for product evaluation purposes
//
//###########################################################################
//
// FILE:	DSP28_Ev.c
//
// TITLE:	DSP28 Event Manager Initialization & Support Functions.
//
//###########################################################################
//
//  Ver | dd mmm yyyy | Who  | Description of changes
// =====|=============|======|===============================================
//  0.55| 06 May 2002 | L.H. | EzDSP Alpha Release
//  0.56| 20 May 2002 | L.H. | No change
//  0.57| 27 May 2002 | L.H. | No change
//###########################################################################

#include "DSP28_Device.h"

//---------------------------------------------------------------------------
// InitEv: 
//---------------------------------------------------------------------------
// This function initializes to a known state.
//
void InitEv(void)
{   
/* EvaRegs.ACTRA.bit.CMP1ACT=2;//比较输出引脚1上的动作,低有效
   EvaRegs.ACTRA.bit.CMP2ACT=2;//比较输出引脚1上的动作,低有效
   EvaRegs.ACTRA.bit.CMP3ACT=2;//比较输出引脚1上的动作,低有效 */
   
   EvaRegs.ACTR.all=0x0666;
   EvaRegs.DBTCONA.all = 0x0000;  // Disable deadband
   EvaRegs.COMCONA.all = 0xa600;  //使能比较操作

   EvaRegs.EVAIMRA.all=0x0200; //EVAIMRA(EVA的中断屏蔽寄存器A).T1PINT(通用定时器1的周期中断使能)
   EvaRegs.EVAIMRB.all=0x0000;
   EvaRegs.EVAIMRC.all=0x0000;
   EvaRegs.EVAIFRA.all=0xffff;//EVAIFRA(EVA的中断标志寄存器.T1PINT(通用定时器1的周期中断标志)
   EvaRegs.EVAIFRB.all=0xffff;//写1清除定时器1的周期中断标志
   EvaRegs.EVAIFRC.all=0xffff;                             
   EvaRegs.CMPR1=0;
   EvaRegs.CMPR2=0;
   EvaRegs.CMPR3=0;

/* EvaRegs.GPTCONA.bit.TCOMPOE = 1;  
   EvaRegs.GPTCONA.bit.T1PIN = 1;
   EvaRegs.GPTCONA.bit.T2PIN = 2;
*/
   EvaRegs.GPTCONA.all=0x0041;
    //周期必须大于最大的正弦表格值
/*   EvaRegs.T1PR = 3750;       // Timer1 period PWM载波周期为 65536个定标的定时器时钟周期 
   EvaRegs.T1CNT = 937;
 //EvaRegs.T1CON.all = 0x0b4e;  // 选择模式产生PWM波10
 */
 EvaRegs.T1PR = 1250;  // Timer1 period PWM载波周期为 65536个定标的定时器时钟周期 
   EvaRegs.T1CNT = 1250*0.25;
 //EvaRegs.T1CON.all = 0x0b4e;
 EvaRegs.T1CON.all = 0x094e;
   EINT;

   return;
}	
	
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// No more.
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