max262.c

滤波器芯片MAX262的单片机C语言驱动程序

#define  __MAX262_LIB__
#include "max262.h"

void delays(uint16 i)
 {
  while(i--);
 }

void MAX262_Initial(void)
   {Wr=1;}   

void MAX262_Update(uchar ch,uchar mode,uchar f,uchar q)
{
 uchar add,i,x;
 if (ch==0) add=0; else add=32;									 //ch=0 for channel A, =1 for B
 //Wr=0;
 setport(add+mode-1);
 //Wr=1;
 dataup();
 add=add+4;
 for (i=0;i<3;i++)
 {
 	x=add+(f-4*(f/4));
	//Wr=0;
	setport(x);
	//Wr=1;
	dataup();
	f=f/4;
	add=add+4;	
 }
 for (i=0;i<4;i++)
 {
 	x=add+(q-4*(q/4));
	//Wr=0;
	setport(x);
	//Wr=1;
	dataup();
	q=q/4;
	add=add+4;
 }
 setport(0xff);
}

uchar convf(uint32 fclk,uint32 f0)
{
return (uchar)((double)(fclk*2.0)/(double)f0/3.14-26);
} 

uchar convq(float q)
{
return (uchar)(128.0-64.0/q);
}

void MAX262_Lowpass(uint32 fo)
 {
  AD9954_RESET();
  AD9954_Initial(SingleToneMode);//LinearSweepMode,RamMode.SingleToneMode 
  AD9954_SETFRE(fo*160);
  MAX262_Update(0,2,63,64);//Filter A,MOD2,Qmax=90
  MAX262_Update(1,3,63,64);//Filter B,MOD3,Qmax=64
  //Send9851(fo,0);

  }

  
void MAX262_Highpass(uint32 fo)
{
  AD9954_RESET();
  AD9954_Initial(SingleToneMode);//LinearSweepMode,RamMode.SingleToneMode 
  AD9954_SETFRE(fo*160);
  MAX262_Update(0,3,63,64);
  MAX262_Update(1,3,63,64);
   //Send9851(fo,0);

}