canshu.c

单片机控制max261/max260/max262的C语言程序

//2. MAX261参数f0,Q写入程序：
#include <REG51.H>       /* special function register declarations   */
                    /* for the intended AT89C2051 derivative         */

#include <stdio.h>       /* prototype declarations for I/O functions */

sbit P1_0=P1^0;                       /* /RESET connect to P1^0 */
sbit P1_2=P1^2;                             /* D1 connect to P1^2 */
sbit P1_3=P1^3;                             /* D0 connect to P1^3 */
sbit P1_4=P1^4;                             /* A3 connect to P1^4 */
sbit P1_5=P1^5;                             /* A2 connect to P1^5 */
sbit P1_6=P1^6;                             /* A1 connect to P1^6 */
sbit P1_7=P1^7;                             /* A0 connect to P1^7 */
sbit P3_7=P3^7;                             /*  /WR connect to P3^7 */
/*------------------------------------------------
The main C function.  Program execution starts
here after stack initialization.
------------------------------------------------*/
void main (void) {
int i;
int a[8];
for(i=0;i<8;i++)
a[i]=i;
printf("please enter number 0 to 8 by order to set MAX261: ");
for(i=0;i<8;i++)
scanf("%d",&a[i]);
P1_0=1;                                                       //  /RESET=1 to make 7555 oscillator work normally
P3_7=1;
/*------------------------------------------------
The following program section realize the function of setting f0A=1125.4HZ,
QA=90.5 of MAX261.
------------------------------------------------*/
  switch (a[i]) {

/*------------------------------------------------
The following program section realize the function of selecting  mode2 to the filter A of MAX261 
and setting F5aF4aF3aF2aF1aF0a=001000B,Q6aQ5aQ4aQ3aQ2aQ1aQ0a=1111111B
------------------------------------------------*/
case '0':  
P3_7=0;                                  //  the falling edge of /WR 
//p1=0x08;
P1_2=0;                                //select mode 2,set M1a=0
P1_3=1;                                           //set M0a=1             
P1_4=0; 
P1_5=0; 
P1_6=0; 
P1_7=0;                               //address A3 A2 A1 A0=0x0
P3_7=1;                                                          
case '1':  
P3_7=0;                            //the falling edge of /WR 
P1_2=0;                                       //set F1a=0                                                    
P1_3=0;                                 //set F0a=0 
P1_4=0; 
P1_5=0; 
P1_6=0; 
P1_7=1;                  //address A3 A2 A1 A0=0x1
P3_7=1;

case '2':  
P3_7=0;                             //the falling edge of /WR 
P1_2=1;                    //set F3a=1   
P1_3=0;                                   //set F2a=0   
P1_4=0; 
P1_5=0; 
P1_6=1; 
P1_7=0;                           //address A3 A2 A1 A0=0x2
P3_7=1;

case '3':  
P3_7=0;                           //the falling edge of /WR 
P1_2=0;                           //set F5a=0   
P1_3=0;                                   //set F4a=0  
P1_4=0; 
P1_5=0; 
P1_6=1; 
P1_7=1;                           //address A3 A2 A1 A0=0x3
P3_7=1;

case '4': 
P3_7=0;                           //the falling edge of /WR 
P1_2=1;                           //set Q1a=1 
P1_3=1;                                    //set Q0a=1 
P1_4=0; 
P1_5=1; 
P1_6=0; 
P1_7=0;                    //address A3 A2 A1 A0=0x4
P3_7=1;

case '5': 
P3_7=0;                          //the falling edge of /WR 
P1_2=1;                            //set Q3a=1  
P1_3=1;                               //set Q2a=1 
P1_4=0; 
P1_5=1; 
P1_6=0; 
P1_7=1;           //address A3 A2 A1 A0=0x5
P3_7=1;


case '6': 
P3_7=0;            //the falling edge of /WR 
P1_2=1;                      //set Q5a=1  
P1_3=1;                     //set Q4a=1 
P1_4=0; 
P1_5=1; 
P1_6=1; 
P1_7=0;                  //address A3 A2 A1 A0=0x6
P3_7=1;


case '7': 
P3_7=0;                    //the falling edge of /WR 
P1_2=0;  
P1_3=1;                       //set Q6a=1
P1_4=1; 
P1_5=0; 
P1_6=0; 
P1_7=0;               //address A3 A2 A1 A0=0x7
P3_7=1;
}
}