pwm_m.c

：利用DSP2812发出频率为7500Hz的方波.rar

//
//      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"
  //Uint16 temp;
 int16 result[10];
 int16 k=0;
Uint16 capnum1;
Uint16 capnum2;
float32 f;
float32 pinlvf[5];
int16 fnum=0;

  interrupt void ISRCAPINT1(void);
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();



    EALLOW;
	PieVectTable.CAPINT1 = &ISRCAPINT1;
	EDIS;

	IER |= M_INT5;
	PieCtrl.PIEIER3.bit.INTx5 = 1;

  //	CAP1Init();
	
	EINT;
	ERTM;

  /*  while(1)
{
    if((EvaRegs.CAPFIFO.bit.CAP1FIFO)==2)
	   temp = EvaRegs.CAP1FBOT-EvaRegs.CAP1FIFO;
  }*/
 
} 	

  interrupt void ISRCAPINT1(void)
{
      Uint16 temp;
             EvaRegs.EVAIFRC.bit.CAP1INT=1;
             capnum1=EvaRegs.CAP1FIFO;
             capnum2=EvaRegs.CAP1FIFO;
             if(capnum2 > capnum1)
                    temp = capnum2-capnum1;
             else
                    temp = capnum2+(0xFFFF-capnum1);
             pinlvf[fnum++] =temp;
             if(fnum>4) fnum=0; 
             f= 2343750.0/(float)temp;//f= 150M/64/temp


	PieCtrl.PIEACK.all = PIEACK_GROUP3;
}
//===========================================================================
// No more.
//===========================================================================