max262.c

纯C编写

#include <REG52.H>    
 #include <MATH.H>    
 #include  <INTRINS.H>    
   
 typedef  unsigned char  uchar ;   
 typedef unsigned int  uint;   
   
 #define P_262 P1   //口线连线(从高到低):A3,A2,A1,A0,D1,D0,Wr,_    
  sbit P_wr = P_262^1;   
  sbit Fclk_S2=P2^2; //CPLD选择Fclk控制线    
  sbit Fclk_S1=P2^1;   
  sbit Fclk_S0=P2^0;   
   
 sbit PFS0=P2^3;//工作模式工作模式选择0    
 sbit PFS1=P2^4;//工作模式工作模式选择1    
   
 long FLCK = 1000000 ; //MAX262工作频率    
 uchar Mod=2;//工作模式0,1,2,3    
 #define PI 3.1415926    
   
   
   
#define delay_262()  _nop_();_nop_();_nop_()    
   
void delay(unsigned int d)   
{unsigned char j;   
while(d!=0)   
  {   
   d--;   
   j=70;   
   do {j--;} while(j!=0);   
  }   
   
}   
   
//***************************************************************    
//写两比特的数据    
void write(uchar add,uchar dat2bit)   
{   
     P_262=(P_262&0x0f)|(add<<4);   
     P_262=(P_262&0xf3)|((dat2bit<<2)&0x0c);   
     P_wr=0;   
     delay_262();   
     P_wr=1;   
     delay_262();   
    }   
//**************************************************************    
   
//设置A通道工作模式    
void Set_AM(uchar mod)   
 {   
     write(0,mod);   
    }   
//设置A通道F值    
void Set_AF(uchar datF)   
 {   
     write(1,datF);   
     datF=datF>>2;   
     write(2,datF);   
     datF=datF>>2;   
     write(3,datF);   
    }   
//设置A通道Q值    
void Set_AQ(uchar datQ)   
 {   
     write(4,datQ);   
     datQ=datQ>>2;   
     write(5,datQ);   
     datQ=datQ>>2;   
     write(6,datQ);   
     datQ=(datQ>>2)&1;   
     write(7,datQ);   
    }   
//设置B通道工作模式    
void Set_BM(uchar mod)   
 {   
     write(8,mod);   
    }   
//设置A通道F值    
void Set_BF(uchar datF)   
 {   
     write(9,datF);   
     datF=datF>>2;   
     write(10,datF);   
     datF=datF>>2;   
     write(11,datF);   
    }   
//设置A通道Q值    
void Set_BQ(uchar datQ)   
 {   
     write(12,datQ);   
     datQ=datQ>>2;   
     write(13,datQ);   
     datQ=datQ>>2;   
     write(14,datQ);   
     datQ=(datQ>>2)&1;   
     write(15,datQ);   
    }   
   
//***************************************************************    
//基本计算    
//***************************************************************    
//根据截止频率fc计算中心频率f0    
//    
/*   
uchar CopF0(float q, float fc)   
 {   
        q  =  pow(q, 2);   
        q  =  (float)q*2;   
        q  = (float)(q-1)/q;//1-(1/q)    
        fc = (float)fc * sqrt(sqrt(1+pow(q,2))-q);   
    }   
   
float CopF0_tx(float q, float fc)   
 {   
        q  =  pow(q, 2);   
        q  =  (float)q*2;   
        q  = (float)(q-1)/q;//1-(1/q)    
        fc = fc * sqrt(sqrt(1+pow(q,2))+q);   
    }   
 */   
//根据中心频率求设定值FN    
float CopFn(uchar mod, float f0)   
{   
    if (2==mod)   
          {   
        return ((float)(FLCK/(1.11072*f0))-26);   
          }   
    else   
         {   
         return ((float)((FLCK*2/f0)/PI)-26);   
          }   
    }   
   
//根据Q求设定值QN    
uchar CopQn(uchar mod, float q)   
{   
    if (2==mod)   
      {   
            return (128-(float)(q/90.51));   
      }   
    else   
          {   
   
                 return (128-(float)(q/64));   
          }   
   
    }   
   
 //***************************************    
//功能接口函数    
   
//设定频率    
Set_F0(uchar mod,float f0 )   
{   
  if(f0>28612)   
    {   
     Fclk_S2=0;Fclk_S1=0;Fclk_S0=0;//Fclk 4M    
     FLCK=4000000;   
     }   
  else if(f0>14306)   
     {   
      Fclk_S2=0;Fclk_S1=0;Fclk_S0=1;//Fclk 2M    
      FLCK=2000000;   
     }   
  else if(f0>7153)   
    {   
     Fclk_S2=0;Fclk_S1=1;Fclk_S0=0; //Fclk 1M    
     FLCK=1000000;   
     }   
  else if(f0>3683)   
    {   
     Fclk_S2=0;Fclk_S1=1;Fclk_S0=1;//Fclk 512K    
     FLCK=512000;   
     }   
  else if(f0>1831)   
     {   
      Fclk_S2=1;Fclk_S1=0;Fclk_S0=0;//Fclk 256    
      FLCK=256000;   
      }   
  else   
     {   
      Fclk_S2=1;Fclk_S1=0;Fclk_S0=1;//Fclk 128    
      FLCK=128000;   
      }   
   
 Set_AF(CopFn(mod,f0));   
 Set_BF(CopFn(mod,f0));   
}   
   
//设置滤波器模式 , 0为底通、1为高通、2为带通    
Set_PFmod(uchar mod)   
{   
 if(mod<3)   
   {   
     switch(mod)   
      { case 0:   
              PFS1=0;PFS0=0;   
              Mod=0;   
              break;   
         case 1:   
              PFS1=0;PFS0=1;   
              Mod=2;   
              break;   
         case 2:   
              PFS1=1;PFS0=0;   
              Mod=0;   
              break;   
       }   
     Set_AM(Mod); Set_BM(Mod);   
   }   
   
}   
   
   
//uint Tx;    
   
   
 float Tx;   
void main(void)   
{   
   
   /*   
   Tx=CopFn(Mod,120048);   
   Tx=CopQn(Mod,1);   
   Tx=CopF0(0.7,60000);   
   Tx=CopF0_tx(0.7,Tx); */   
   
   delay(10000);delay(10000);delay(10000);   
   
   Set_AM(Mod);   
   Set_AQ(CopQn(Mod,1));   
   Set_BM(Mod);   
   Set_BQ(CopQn(Mod,1));   
   
  //Set_AF(CopFn(Mod,5000));    
  //Set_BF(CopFn(Mod,5000));    
   Set_PFmod(2);   
  Set_F0(Mod,8000);   
   
  for(;;);   
}