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我ad9850的程序图，求高人指点，我把不会的部分用红色字...

时间：10-02 整理：3721RD 点击：

求高手加q2293859733，求助！非常着急...

ad9850函数信号发生器


#include  <reg52.h>

#define  uchar unsigned char

#define  uint unsigned int

sbit  LCD_RS = P1^0;

sbit  LCD_RW = P1^1;

sbit  LCD_E  = P1^2;

#define  LCD_DATA  P0  //液晶1602管脚设置

sbit w_clk =  P1^3; // ad9850 w_clk;

sbit fq_ud  =  P1^4; //ad9850 fqud;

sbit reset  = P1^5; //ad9850 reset

sbit  s01=P1^6;  

sbit  s02=P1^7 ; //波形转换使能

unsigned  char code Lcdtab1[]= {"Freq:        Hz"};

unsigned  char code Lcdtab2[]= {"AD9850 Sine -->"};

unsigned  char code Lcdtab3[]= {"AD9850 Tria -->"};

unsigned  char code Lcdtab4[]= {"AD9850 Squa -->"};

unsigned  char code Lcdtab5[]= {"CXL Grad design"};

unsigned  char code Lcdtab6[]= {"DDS WELCOME ！"};

unsigned  char code Lcdtab7[]= {"AD9850 GND  -->"};//1602预读字体

double Con_Word_1 = 0x00;

double Con_Word_2 = 0x00;

long uint ConTrol_Word = 0x00;//根据设置的频率换算成将要送入AD9850中的整数量；

long uint Frequency_Out;

uchar a,b,c,d,e,f,g,h,wav;

uchar AnJianCiShuBiangLiang = 0x00;

long uint SheZhiZhongYaoXianShiDeShuJu = 0x00;

uchar dingshiqilideshijianbianliang = 0x00;（定时器的时间变量）

uchar lianjiabiaozhi = 0x00;lianjianbiaozhi = 0x00;

long uint Out_Signal_Max = 30000000;//设置子程序中的上限值，设30MHz

uint Light_Bian_Liang = 0x00;

sbit  P3_3 = P3^3;

sbit  P3_4 = P3^4;

sbit  P3_5 = P3^5;

sbit  P3_6 = P3^6;

sbit  P3_7 = P3^7;//矩阵键盘设置

uchar j = 0,dat = 0;

uchar keyzhi = 0x00;

void  lcd_init(void);

void  display_string(unsigned  char x,unsigned  char y,unsigned  char *s);

Qu_Chu_Shu_Ma_Ge_Wei();

void time0(void)interrupt 1 using 1     //Interruption

{

  EA=0;

  dingshiqilideshijianbianliang++;  

  TH0=0xa6;                 //shi de sha ping

  TL0=0x66;

  ET0 =1 ;

  TR0 = 1;

  EA=1;

}

void delay(long unsigned int h)

{

  while(h--);    //0.01MS

}

void  WriteDataLcd(unsigned  char wdata)

{   

   LCD_RS=1;

   LCD_RW=0;

   LCD_E=0;

   LCD_E=1;

   LCD_DATA=wdata;

   delay(100);     //短暂延时，代替检测忙状态

   LCD_E=0;

   //LCD_RW = 1;

   //LCD_E=1;

}

void  WriteCommandLcd(unsigned char wdata)

{

   LCD_RS=0;

   LCD_RW=0;

   LCD_E=0;

   LCD_E=1;

   LCD_DATA=wdata;

   delay(100);     //短暂延时，代替检测忙状态

   LCD_E=0;

}

//LCD初始化

void  lcd_init(void)

{

     LCD_DATA = 0;

delay(1000);

     WriteCommandLcd(0x38);

     delay(500);

     WriteCommandLcd(0x38); //显示模式设置

delay(500);

WriteCommandLcd(0x38); //显示模式设置

delay(500);

     WriteCommandLcd(0x01); //关闭显示

     WriteCommandLcd(0x38); //显示清屏

     WriteCommandLcd(0x0c); //显示光标移动设置

     WriteCommandLcd(0x06); //显示开及光标移动设置

//WriteCommandLcd(0x0f);

//WriteCommandLcd(0x80);

//WriteDataLcd(0x30);

//WriteDataLcd(0x31);

//WriteDataLcd(0x32);

//WriteDataLcd(0x33);

}

void  display_xy(unsigned  char x,unsigned  char y)

{

    if(y==0x01)

{

     x = x + 0x40 + 0x80;     

}

else

{

    x = x+0x80;

}

  WriteCommandLcd(x);

}

void  display_char(unsigned  char x,unsigned  char y,unsigned  char dat)

{

  display_xy(x,y);

  WriteDataLcd(dat);

}

void  display_string(unsigned  char x,unsigned  char y,unsigned  char *s)  （这段是不是申明?*s是什么意思?while（*s）用法）

{

  display_xy(x,y);

  while(*s)

  {

   WriteDataLcd(*s);

   s++;

  }

}

Qu_Chu_Shu_Ma_Ge_Wei()

{

  a = Frequency_Out  % 10;

  b = (Frequency_Out % 100)/10;

  c = (Frequency_Out % 1000)/100;

  d = (Frequency_Out % 10000)/1000;

e = (Frequency_Out % 100000)/10000;

f = (Frequency_Out % 1000000)/100000;

g = (Frequency_Out % 10000000)/1000000;

h = (Frequency_Out % 100000000)/10000000;

}

  scan_KEY(void)         //The subprogram is used to scan key

{

uchar key = 0;

key = P3;           //Eliminate themost high bit and low three bits

key = key & 0xf8;

  switch(key)

       {

       case 0xb0:

          keyzhi = 3 ;break;

   case 0xa8:

          keyzhi = 2 ;break;

   case 0x98:

          keyzhi = 1 ;break;

   case 0x70:

          keyzhi = 6 ;break;

   case 0x68:

          keyzhi = 5 ;break;

       case 0x58:

          keyzhi = 4 ;break;

       default:   

              keyzhi=0;

      }

      return(keyzhi);

}

keychuli()

      {

P3_3 = 0x01;P3_4 = 0x01;P3_5 = 0x01;

P3_6 = 0x00;P3_7 = 0x00;

delay(100);

    if((P3_3&P3_4&P3_5) == 0x00)

{

//delay(1000);

if((P3_3&P3_4&P3_5) == 0x00)

  {

  P3_6 = 0x00;P3_7 = 0x01;

  dat = scan_KEY();

  if(dat == 0x00)  

  {

  P3_6 = 0x01;P3_7 = 0x00;

  dat = scan_KEY();   

  }

  }

  else

  {

  dat = 0x00;  

  goto down;//无键按下

   }

}

down:return(dat);

     }

display_data()

{

Qu_Chu_Shu_Ma_Ge_Wei();

display_string(0,0,Lcdtab1);  //显示第一行，从第2个位置开始

WriteCommandLcd(0x85);//显示数值的话，用其真实的地址，如0x83等，

WriteDataLcd(0x30+h);

WriteDataLcd(0x30+g);

WriteDataLcd(0x30+f);

WriteDataLcd(0x30+e);

WriteDataLcd(0x30+d);

WriteDataLcd(0x30+c);

WriteDataLcd(0x30+b);

WriteDataLcd(0x30+a);

}

Calculate_Control_Word(long uint Frequency_Out)

{

  //Con_Word_1 = Frequency_Out * 85;

  //Con_Word_2 = Frequency_Out * 0.88526071724;

  Con_Word_1 = Frequency_Out * 34;

  Con_Word_2 = Frequency_Out * 0.3537898195;//125M晶振

  Con_Word_2 = Con_Word_2 + 0.5;

  Con_Word_1 = Con_Word_1 + Con_Word_2; //根据设定的频率以浮点形式计算控制字

  ConTrol_Word = Con_Word_1 / 1;//将控制字换算成整数形式  

}

   Send_Control_Word(long uint ConTrol_Word)

{

  long uint ConTrol_Word_Temporary ;

  uchar data_word ;

  w_clk = 0x00; //根据时序图

  fq_ud = 0x00;  //根据时序图

  data_word = 0x00;  //相位、掉电等相关控制字

P0 = data_word;

  w_clk=1;

  delay(50);

  w_clk=0;

  ConTrol_Word_Temporary = ConTrol_Word;  

  ConTrol_Word = ConTrol_Word >> 24;

  data_word = ConTrol_Word % 256;//取出W1，频率控制字中的最高字节；

  P0 = data_word;//AD9850并口接P0；

  w_clk=1;

  delay(50);

  w_clk=0;

  ConTrol_Word = ConTrol_Word_Temporary;

  ConTrol_Word = ConTrol_Word >> 16;

  data_word = ConTrol_Word % 256;//取出W2，频率控制字中的次高字节；

  P0 = data_word;

  w_clk=1;

  delay(50);

  w_clk=0;

  ConTrol_Word = ConTrol_Word_Temporary;

  ConTrol_Word = ConTrol_Word >> 8;

  data_word = ConTrol_Word % 256;//取出W3，频率控制字中的第三字节；  

  P0 = data_word;

  w_clk=1;

  delay(50);

  w_clk=0;

  ConTrol_Word = ConTrol_Word_Temporary;

  data_word = ConTrol_Word % 256;//取出W4，频率控制字中的最后一个字节；  

  P0= data_word;

  w_clk=1;

  delay(50);

  w_clk=0;    //根据时序图

  fq_ud=1;    //根据时序图

}

main()

{

  unsigned char i = 0x00;

  long uint shiyanshuju = 0x00;

  reset  =  1;    //复位AD9850；

  delay(10000);  

  reset  =  0;    //AD9850恢复工作模式；  

  lcd_init();  

    TMOD=0x01;                //用来实现时间设置

TH0=0xa6;               

    TL0=0x66;

    ET0 = 1;

    TR0 = 1;

EA = 0x00;

  Frequency_Out =1000;//开机默认的频率输出值；

  Calculate_Control_Word(Frequency_Out);//根据设置的频率换算成将要送入AD9850中的整数值；

  Send_Control_Word(ConTrol_Word);      //向AD9850送出频率控制字；  

  display_data();

  display_string(0,1,Lcdtab6);

  AnJianCiShuBiangLiang = 0x00;

  //WriteCommandLcd(0xc5);

  //WriteDataLcd(0x30+(Step_Data/1000));

  //WriteDataLcd(0x30+(Step_Data/100)%10);

  //WriteDataLcd(0x30+(Step_Data/10)%10);

  //WriteDataLcd(0x30+(Step_Data%10));

  //display_string(9,1,"Hz");

while(1)

{

if(dingshiqilideshijianbianliang == 10)

   {

   WriteCommandLcd(0x85+AnJianCiShuBiangLiang);//显示数值的话，用其真实的地址，如0x83等，拼音是定时器计数器的时间变量

WriteDataLcd(0x20); //空格

dingshiqilideshijianbianliang = 11;

   }

if(dingshiqilideshijianbianliang == 20)

   {

WriteCommandLcd(0x85+AnJianCiShuBiangLiang);//显示数值的话，用其真实的地址，如0x83等，

WriteDataLcd(0x30+shiyanshuju);

dingshiqilideshijianbianliang = 0x00;

   }

  keychuli(); //键盘配置；

  if(dat == 0x02)

   {

    dat = 0x00;delay(5000); //升频键；

    if(AnJianCiShuBiangLiang == 7)

{

    if((Frequency_Out+1) <= 30000000)

        {

     Frequency_Out = Frequency_Out+1;

    }

}

if(AnJianCiShuBiangLiang == 6)

{

  if((Frequency_Out+10) <= 30000000)

        {

     Frequency_Out = Frequency_Out+10;

    }

}

    if(AnJianCiShuBiangLiang == 5)

{

   if((Frequency_Out+100) <= 30000000)

        {

     Frequency_Out = Frequency_Out+100;

    }

  }

if(AnJianCiShuBiangLiang == 4)

{

  if((Frequency_Out+1000) <= 30000000)

        {

     Frequency_Out = Frequency_Out+1000;

    }

}

if(AnJianCiShuBiangLiang == 3)

{

  if((Frequency_Out+10000) <= 30000000)

        {

     Frequency_Out = Frequency_Out+10000;

    }

}

if(AnJianCiShuBiangLiang == 2)

{

  if((Frequency_Out+100000) <= 30000000)

        {

Frequency_Out = Frequency_Out+100000;

    }

}

    if(AnJianCiShuBiangLiang == 1)

{

if((Frequency_Out+1000000) <= 30000000)

        {

Frequency_Out = Frequency_Out+1000000;

    }

}

if(AnJianCiShuBiangLiang == 0)

{

if((Frequency_Out+10000000) <= 30000000)

        {

Frequency_Out = Frequency_Out+10000000;

    }

}

display_data();//刷新显示；；

     if(AnJianCiShuBiangLiang == 7)

{

shiyanshuju = a;

}

if(AnJianCiShuBiangLiang == 6)

{

shiyanshuju = b;

}

if(AnJianCiShuBiangLiang == 5)

{

shiyanshuju = c;

}

if(AnJianCiShuBiangLiang == 4)

{

shiyanshuju = d;

}

if(AnJianCiShuBiangLiang == 3)

{

shiyanshuju = e;

}

if(AnJianCiShuBiangLiang == 2)

{

shiyanshuju = f;

}

if(AnJianCiShuBiangLiang == 1)

{

shiyanshuju = g;

}

if(AnJianCiShuBiangLiang == 0)

{

shiyanshuju = h;

}

dingshiqilideshijianbianliang = 18;

   }

    if(dat == 0x05)

   {

    dat = 0x00;delay(5000); //降频键；  

if(AnJianCiShuBiangLiang == 7)

{

if(Frequency_Out >= 1)

  {

  Frequency_Out = Frequency_Out-1;

  }

}

if(AnJianCiShuBiangLiang == 6)

{

if(Frequency_Out >= 10)

  {

  Frequency_Out = Frequency_Out-10;

  }

  }

    if(AnJianCiShuBiangLiang == 5)

{

if(Frequency_Out >= 100)

  {

Frequency_Out = Frequency_Out-100;

}

}

if(AnJianCiShuBiangLiang == 4)

{

if(Frequency_Out >= 1000)

  {

Frequency_Out = Frequency_Out-1000;

}  

}

if(AnJianCiShuBiangLiang == 3)

{

if(Frequency_Out >= 10000)

  {

Frequency_Out = Frequency_Out-10000;

}   

}

if(AnJianCiShuBiangLiang == 2)

{

if(Frequency_Out >= 100000)

  {

Frequency_Out = Frequency_Out-100000;

}   

}

    if(AnJianCiShuBiangLiang == 1)

{

  if(Frequency_Out >= 1000000)

  {

Frequency_Out = Frequency_Out-1000000;

}   

}

if(AnJianCiShuBiangLiang == 0)

{

if(Frequency_Out >= 10000000 & Frequency_Out <= 30000000)

  {

Frequency_Out = Frequency_Out - 10000000;

}  

}

display_data();//刷新显示；；

     if(AnJianCiShuBiangLiang == 7)

{

shiyanshuju = a;

}

if(AnJianCiShuBiangLiang == 6)

{

shiyanshuju = b;

}

if(AnJianCiShuBiangLiang == 5)

{

shiyanshuju = c;

}

if(AnJianCiShuBiangLiang == 4)

{

shiyanshuju = d;

}

if(AnJianCiShuBiangLiang == 3)

{

shiyanshuju = e;

}

if(AnJianCiShuBiangLiang == 2)

{

shiyanshuju = f;

}

if(AnJianCiShuBiangLiang == 1)

{

shiyanshuju = g;

}

if(AnJianCiShuBiangLiang == 0)

{

shiyanshuju = h;

}

dingshiqilideshijianbianliang = 18;

   }

   if(dat == 0x03)

   {

   dat = 0x00;delay(5000); //光标左移键；

   EA = 0x01;     

   if(AnJianCiShuBiangLiang == 0x00)

      {

      AnJianCiShuBiangLiang = 0x07;

  }

  else

           {

        AnJianCiShuBiangLiang--;

        }

     display_data();//刷新显示；；

     display_string(0,1,Lcdtab5);

     if(AnJianCiShuBiangLiang == 7)

{

shiyanshuju = a;

}

if(AnJianCiShuBiangLiang == 6)

{

shiyanshuju = b;

}

if(AnJianCiShuBiangLiang == 5)

{

shiyanshuju = c;

}

if(AnJianCiShuBiangLiang == 4)

{

shiyanshuju = d;

}

if(AnJianCiShuBiangLiang == 3)

{

shiyanshuju = e;

}

if(AnJianCiShuBiangLiang == 2)

{

shiyanshuju = f;

}

if(AnJianCiShuBiangLiang == 1)

{

shiyanshuju = g;

}

if(AnJianCiShuBiangLiang == 0)

{

shiyanshuju = h;

}

dingshiqilideshijianbianliang = 18;

   }

      if(dat == 0x01)

   {

   dat = 0x00;delay(5000); //光标右移键；

   EA = 0x01;  

   if(AnJianCiShuBiangLiang == 0x07)

      {

      AnJianCiShuBiangLiang = 0x00;

  }

  else

           {

        AnJianCiShuBiangLiang++;

        }

     display_data();//刷新显示；

     display_string(0,1,Lcdtab5);

     if(AnJianCiShuBiangLiang == 7)

{

shiyanshuju = a;

}

if(AnJianCiShuBiangLiang == 6)

{

shiyanshuju = b;

}

if(AnJianCiShuBiangLiang == 5)

{

shiyanshuju = c;

}

if(AnJianCiShuBiangLiang == 4)

{

shiyanshuju = d;

}

if(AnJianCiShuBiangLiang == 3)

{

shiyanshuju = e;

}

if(AnJianCiShuBiangLiang == 2)

{

shiyanshuju = f;

}

if(AnJianCiShuBiangLiang == 1)

{

shiyanshuju = g;

}

if(AnJianCiShuBiangLiang == 0)

{

shiyanshuju = h;

}

dingshiqilideshijianbianliang = 18;

   }

       if(dat == 0x04)

       {

       dat = 0x00;delay(1000); //确定、输出波形选择键；

   EA = 0x00; s01=0x00;s02=0x00;

   display_data();//刷新显示；

   Calculate_Control_Word(Frequency_Out);//根据设置的频率换算成将要送入AD9850中的整数值；

       Send_Control_Word(ConTrol_Word);      //向AD9850送出频率控制字；      

   AnJianCiShuBiangLiang = 0x00;

       {

   switch(wav)

   {

case 0: //波形选择；

{

s01=0;

s02=1;

display_string(0,1,Lcdta

呃，我也是做这个，可是我还没写程序。你厉害噢~~

额 void  display_string(unsigned  char x,unsigned  char y,unsigned  char *s)  （这段是不是申明?*s是什么意思?while（*s）用法）
{
  display_xy(x,y);
  while(*s)
  {
   WriteDataLcd(*s);
   s++;
  }
}
就这段程序的 函数命名分析可知 这段代码的作用是 LCD输出一个字符串 这里的 *s是一个指针 指向待输出的字符串数组的首地址
while（*s）的意思是 当 *s指向的数据返回 0 时证明已经到了数据的尽头，即显示完毕。因为循环体内有s++；这句用来指向下一个数据
我自己的个人习惯是
while( s[i]！='\0' )
{
   WriteDataLcd(s[i]);
   i++;
}
这样可能稍微好理解一些

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