ramtest.c

本程序通过F2812实现SPWM,开发平台CCS

#include "DSP281x_Device.h"     // DSP281x Headerfile Include File
#include "DSP281x_Examples.h"   // DSP281x Examples Include File
#include "float.h"
#include "math.h"	
volatile Uint16 angel_step,*Dataram=(Uint16*)0x100000;//RAM 起始地址为0X100000
volatile float sindata,angel;   /*k代表角度*/
//Gpio 初始化
void InitGpio(void)
{
}
//EVA 初始化
void InitEVA(void)
{
}
void main(void)
{
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP281x_SysCtrl.c file.
   InitSysCtrl();

// Step 2. Initalize GPIO: 
// This example function is found in the DSP281x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
   InitGpio();  // Skipped for this example  

// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts 
   DINT;

// Initialize PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.  
// This function is found in the DSP281x_PieCtrl.c file.
   InitPieCtrl();
   
// Disable CPU interrupts and clear all CPU interrupt flags:
   IER = 0x0000;
   IFR = 0x0000;

// Initialize the PIE vector table with pointers to the shell Interrupt 
// Service Routines (ISR).  
// This will populate the entire table, even if the interrupt
// is not used in this example.  This is useful for debug purposes.
// The shell ISR routines are found in DSP281x_DefaultIsr.c.
// This function is found in DSP281x_PieVect.c.
   InitPieVectTable();
   InitEVA();
   angel_step=0;
   while(1)
   {if(Dataram<(Uint16*)0x107a13)//256K
    {angel=180.0/31250*angel_step;
     angel=3.1415926*angel;
     angel=angel/180;/*数据类型优先级,sin弧度计算*/
     sindata=sin(angel);
     sindata=sindata*1024;
     sindata=sindata+1024;
     sindata=sindata*32;
     if(sindata>=65536)
       {*Dataram++=65535;
        angel_step++;
       }
     else 
       {*Dataram++=sindata;
        angel_step++;
       }
    }
    else
    asm(" nop");
   }
}
         *(int *)MCRA=0X0fb;        /*PB=I/O PA2(int1)=oka=I/O*/
         *(int *)MCRB=0X0fec3;      /*PC2,3,4,5=spi to i/o,PD0=okb=I/O*/
         *(int *)MCRC=0X000ff;      /*PF=I/O PE=FUNC*/
         *(int *)PADATDIR=0X0404;   /*PA2=oka=Out value=1*/
         *(int *)PBDATDIR=0X0ff09;  /*PB=Out value=0*/
         *(int *)PCDATDIR=0X03420;  /*PC3=IN,PC2,4,5=Out PC5value=1,PC4=0*/
         *(int *)PDDATDIR=0X0101;   /*PD0=okb=Out value=1*/
         *(int *)PFDATDIR=0X0f000;  /*PF=IN ,value=0*/
         asm("   clrc intm");	
        /*pwm*/
        *(int *)GPTCONA=0Xe065;  /*B0000,0000,0100,0010*/
        *(int *)T1CNT=0x0;  /*USE?*/
        *(int *)T1PR=2048;    
        *(int *)ACTRA=0X0555; /*B0000,0101,0101,0101*/
        *(int *)CMPR1=1024;
        *(int *)CMPR2=0;
        *(int *)CMPR3=0;     
        *(int *)COMCONA=0x04b00; /*B0100,1010,0000,0000*/
        *(int *)COMCONA=0X0Cb00; /*B1100,1010,0000,0000*/
        *(int *)T1CON=0X1048;   /*B0001,0000,0100,1010*/           
        /*T4 time*/
        *(int *)GPTCONB=0X0005;  /*B0000,0000,0000,0101*/
        *(int *)T4PR=159;        /*40000000/640=62500*/
        *(int *)T4CNT=0;
        *(int *)EVBIFRB=0x0ff;
        *(int *)T4CON=0X1042;    /*B1001,0111,0100,0000*/     

WAITRUN: 
        dotadd1=0x8000; 
        dotval1=32768; 
        periodno=1; 
 
        currfreq=50;
    
        currampl=1024;

        currdcval=0;

        currdcfx=0;

CALVIB:
        dotval1=*(int *)dotadd1;
        dotval1=dotval1>>5;
        if(dotval1<0x400)
            dotval1=0x400;	
        dotval1=dotval1-0x400;
        numdiv=currampl*dotval1;
        dotval1=numdiv>>10;
        if(dotval1>0x3ff)
            dotval1=0x3ff;
        dotval1=dotval1+0x400;				
        if(periodno!=1)
        {   dotval1=0x800-dotval1;
            dotval1++;
    	}
WAITT4:   
        *(int *)WDKEY=0X5555;
        *(int *)WDKEY=0X0AAAA;
        if(!(*(int *)EVBIFRB&0x1))
            goto WAITT4; 		
        *(int *)CMPR1=dotval1;
        dotadd1=dotadd1+currfreq;		 
        *(int *)EVBIFRB=0x0ff;
        *(int *)IMR=0x0; 
        if(dotadd1>=0x0FA12)
        {   dotadd1=dotadd1-31250;
            if(periodno==2) 
                periodno=1;             	
            else
                periodno=2;
        }   
ONEEND:

        *(int *)IMR=0x1; 
        goto CALVIB;

//===========================================================================
// No more.
//=====