pwm_m.c

TMS320F2812的SPWM原程序,通过本程序直接在6路PWM输出口输出波形。

//
//      TMDX ALPHA RELEASE
//      Intended for product evaluation purposes
//
//###########################################################################
//
// FILE:	DSP28_Example.c
//
// TITLE:	DSP28 CPU_Timer example program.
//
//###########################################################################
//
//  Ver | dd mmm yyyy | Who  | Description of changes
// =====|=============|======|===============================================
//  0.55| 06 May 2002 | S.S. | EzDSP Alpha Release
//  0.57| 27 May 2002 | L.H. | No change
//###########################################################################

// Step 0.  Include required header files
         // DSP28_Device.h: device specific definitions #include statements for
         // all of the peripheral .h definition files.
         // DSP28_Example.h is specific for the given example.  

//#include "DSP28_Device.h"


//void main(void)
//{
	/*初始化系统*/
//	InitSysCtrl();

	/*关中断*/
//	DINT;
//	IER = 0x0000;
//	IFR = 0x0000;
	
	/*初始化PIE控制寄存器*/
//	InitPieCtrl();
	
	/*初始化PIE矢量表*/
//	InitPieVectTable();	
	
	/*初始化EV*/
//	InitEv();
	
//	EINT;
//	ERTM;

//	for(;;)
//	{
//		KickDog();
//	}

//} 	

       //实现了SPWM的输出
//      #include "DSP281x_Device.h"
	  #include "DSP28_Device.h"
      #include "stdio.h"
      #include "math.h"
      #include "float.h"
      #define NX 404
      #define PI 3.1415925
      float M=0.8;
      int k0=0,h1=0;
      double a[NX];
      void zkb();
      interrupt void eva_T1UFINT_ISR(void);
       unsigned int n=0; 
        float q,l,j;
      void main(void)
      {
          InitSysCtrl(); //系统初始化
          DINT;         //禁止全局中断
          IER=0x0000;
          IFR=0x0000;
          
          EALLOW;     
          GpioMuxRegs.GPAMUX.all = 0x00FF; // EVA PWM 1-6  pins
          EDIS;
         
          InitPieCtrl();     
          InitPieVectTable();
          
          EALLOW;        //使能定时器1下益中断
          PieVectTable.T1UFINT=&eva_T1UFINT_ISR;
          EDIS;
          
          IER|=M_INT2;  //开中断2
//          PieCtrlRegs.PIEIER2.bit.INTx6=1; //开下益中断
          PieCtrl.PIEIER2.bit.INTx6=1;   //by  jjun
//		  PieCtrl.PIEIER2.all = M_INT4;
      ////////////////////
       
        while (n<=NX)  
        {
          q=(n+0.75);    //为消除偶次偕波，减少谐波角度出发，选择从A相3/4周期进行采样
          q=q*2*PI;      
          q/=405; 
          j=sin(q);     
          l=1875*(1+M*j);//M为振幅调制比     //计算占空比表达式
          //if(l>=187&l<=1687)(此处网友设置为错误的）
         if(l>=375&l<=3375)
           a[n]=l;  
          else
              {
              if(l>3375)
               a[n]=3375;
              else
               a[n]=375;
              }  
           
         n=n+1;
        }
      //////////////////////////////
        
          
        ///init_eva
      ///////////////////////////////
       EvaRegs.ACTRA.all=0x0666;      //比较方式控制器,
//       EvaRegs.DBTCONA.all = 0x0000;  // Disable deadband
       EvaRegs.DBTCONA.all = 0x0FBC;    //by jjun
       EvaRegs.COMCONA.all = 0xa600;  //使能比较操作,选择禁止SVPWM模式
//       EvaRegs.COMCONA.all = 0x8200;    //by jjun 
//       EvaRegs.COMCONA.all = 0x8600;  //by jjun         
       EvaRegs.EVAIMRA.all=0x0200; 
//EVAIMRA(EVA的中断屏蔽寄存器A).T1UIINT(通用定时器1的下溢中断使能)
       EvaRegs.EVAIMRB.all=0x0000;
       EvaRegs.EVAIMRC.all=0x0000;
       EvaRegs.EVAIFRA.all=0xffff;//EVAIFRA(EVA的中断标志寄存器.T1UIINT(通用定时器1的下溢中断标志)
       EvaRegs.EVAIFRB.all=0xffff;//写1清除定时器1的下溢中断标志
       EvaRegs.EVAIFRC.all=0xffff;                             
       EvaRegs.CMPR1=0;           //初始化寄存器的值
       EvaRegs.CMPR2=0;
       EvaRegs.CMPR3=0;        
       
       EvaRegs.GPTCONA.all=0x0041;//通用定时控制器。各定时器独立出发逻辑，输出低有效
          //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.T1PR = 0xffff;
       //EvaRegs.T1CNT = 937;      // Timer1 counter 
       EvaRegs.T1CNT = 937;
       //EvaRegs.T1CON.all = 0x0b4e;  // 选择模式产生PWM波10
       
       EvaRegs.T1CON.all = 0x0b4e;
       EINT;
       
       
       
//       return;
      ///////////////////////////
        EvaRegs.T1CON.all=EvaRegs.T1CON.all|0x0040;  //启动定时器1
        
            
                 for(;;);  
      } 
       
      interrupt void eva_T1UFINT_ISR(void)    // EV-A
      {
        int h2;
        int flag;
        flag=(EvaRegs.EVAIFRA.all)&0x0200;  //T1UFINT中下益中断标志位置1 
          if(flag!=0x0200) 
            {
             EINT;
             return;
            } 
          else
           {
            if(k0<=NX)
             {
             h1=k0+135;      //B相表达式
             if(h1>=404)
             h1=h1-404;
             h2=k0+270;      //C相表达式
             if(h2>=404)
             h2=h2-404;
             EvaRegs.CMPR1=a[k0];
             EvaRegs.CMPR2=a[h1];  //更新比较寄存器2的值   
             EvaRegs.CMPR3=a[h2];  //更新比较寄存器3的值
             k0=k0+1;
             }
            else       
             {
              k0=0; 
             }
            }
        
          EvaRegs.EVAIMRA.bit.T1UFINT=1; //清除中断屏蔽标志
          EvaRegs.EVAIFRA.bit.T1UFINT=1; //清楚中断使能标志
//          PieCtrlRegs.PIEACK.all=0x0002;     //响应同组中断
		  PieCtrl.PIEACK.all=0x0002;
          EINT;                          //开全局中断
      }  
//===========================================================================
// No more.
//===========================================================================