dds.rar_9850_AD98_ad9850_ad9850 interface

//----------------------------------------- // //2007年全国电子设计大赛培训专用 // 基于DDS的信号发生器 // Design By BoBo&ShuiJian //------------------------------------------ #include<reg51.h> #include<absacc.h> #include<stdio.h> #include"LCD.h" //----------每位的控制字----------------- #define FF7 357913941//858993459 //50M //2147483648 20M //357913941 120M //385136686 111MHz晶振 #define FF6 35791394//85899346 //214748365 //35791394 //38513669 #define FF5 3579139//8589935 //21474836 //3579139 //3851367 #define FF4 357914//858993 //2147484 //357914 //385137 #define FF3 35791//85899 //214748 //35791 //38514 #define FF2 3579//8590 //21475 //3579 //3851 #define FF1 358//859 //2148 //358 //385 #define FF0 36//86 //215 //36 //--------------8279端口定义-------------- #define com XBYTE[0X0001] //命令字地址 #define dat XBYTE[0X0000] //数据口地址 //--------------DDS控制-------------------- #define data_OUT XBYTE[0x1C00] //采用总线方式CE7 #define data_OUT1 XBYTE[0x1400] //采用总线方式CE5 //--------------AD7524端口定义------------- #define AD7524 XBYTE[0x0C00] //程控衰减地址 unsigned long data temp_r ; //频率值预存 sfr AUXR = 0x8e; bit int_flag=0; /*中断标志位*/ sbit clflag=ACC^7; unsigned char LCD_string[]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,'\0'}; //LCD显示字符串变量 unsigned char LCD_step[]={0x00,'\0'}; unsigned char step_i=0; //ma步进值下标 unsigned char step[]={0x00,0x19,0x32,0x4B,0x64,0x7D,0x96,0xAF,0xC8,0xE1,0xFA}; //ma步进控制值 unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; //数码管段码 unsigned char freq[]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}; //8位数码管频率值 unsigned char con_word[5]; //频率控制字 unsigned char i,temp; //temp用于存放临时命令状态字 unsigned char key_value; //按键值 //-----------------------主要函数-------------------------- void IntToStr(void); //LCD显示字符转换 void longtoword(unsigned long num); //长整型转频率控制字 void write_ad9850(void); //控制字写入ad9850 void write_ad98501(void); unsigned long jisuan(unsigned char data *fno); //频率值产生 unsigned char keyin(void); //按键函数 void setup_8279(void); //8279初始化 void display_led(void); //数码管显示 void delay(unsigned char i); //延时 //------------------频率步进设置---------------------- void f10Mhz(void); //S1 void f1Mhz(void); //S2 void f100Khz(void); //S3 void f10Khz(void); //S4 void f1Khz(void); //S5 void f100Hz(void); //S6 void f10Hz(void); //S7 void f1Hz(void); //S8 //----------------------------------------------------- void carry_sin(void); //载波正弦波发生 S9 void mod_sin(void); //调制信号正弦波发生S10 void ma_step(void); //调制度10%步进 void mode(void); unsigned char a,b,k; //-------------------------主函数-------------------------------- void main(void) { Init_LCD(); Clear_Screen(); Write_Nopara_Command(0x98); AUXR = 0x02; /*STC单片机关内部RAM和开ALE*/ EA=1; EX0=1; //开外部中断 IT0=1; //-----------延时(必须加)------------- for(a=0;a<5;a++) { for(b=0;b<50;b++) { for(k=0;k<50;k++); } } //------------------------------------ setup_8279(); //初始化8279 delay(1000); Display_hz(2,0,"信号发生器"); Display_String(12,0,"(Hz)"); Display_hz(0,1,"载波"); Display_String(4,1,":"); Display_hz(0,2,"调制波"); Display_String(6,2,":"); Display_hz(0,3,"调制度"); Display_String(6,3,":"); while(1) { mode(); } } //------数码管显示---------------- void display_led(void) { for(i=0;i<8;i++) { com=0x80+i; //写显示RAM dat=dispcode[freq[7-i]]; //显示段码 delay(120); } } //-----8279初始化----------------- void setup_8279(void) { com=0x00; //键盘，显示方式 com=0x34; //20分频 com=0xd1; //1101 0001b 清除所有显示 temp=com; //读状态字 do{ACC=com;} while(clflag==1); //清除起来比较慢，所以一条指令执行的时间不足以完成所有清除，故需等待 } //---------频率值转换控制字---------- void longtoword(unsigned long num) { con_word[0]=0x00; //置工作方式选择位为00 con_word[4]=num&(0xff); num=num>>8; con_word[3]=num&(0xff); num=num>>8; con_word[2]=num&(0xff); num=num>>8; con_word[1]=num&(0xff); } /***计算控制字************/ /***入口：频率数组指针***出口，控制字*****/ unsigned long jisuan(unsigned char data *fno) { unsigned long dds_no ; dds_no= (*(fno+7))*FF7+ (*(fno+6))*FF6+ (*(fno+5))*FF5+ (*(fno+4))*FF4+ (*(fno+3))*FF3+ (*(fno+2))*FF2+ (*(fno+1))*FF1+ (*fno)*FF0 ; return(dds_no); } //---------------------进位判断------------------- unsigned char judge(unsigned char a) { unsigned char b=0; if(a>=10) { b=0; } else { b=a; } return b; } //-------------------步进按键or模式选择--------------- void mode(void) { if(int_flag==1) { int_flag=0; switch(key_value) { case 0x40:f10Mhz();break; case 0x41:f1Mhz();break; case 0x42:f100Khz();break; case 0x43:f10Khz();break; case 0x48:f1Khz();break; case 0x49:f100Hz();break; case 0x4a:f10Hz();break; case 0x4b:f1Hz();break; case 0x50:carry_sin();break; case 0x51:mod_sin();break; case 0x52:ma_step();break; default:break; } } } /*步进按键函数*/ void f10Mhz(void) //10Mhz步进 { freq[7]=freq[7]+1; freq[7]=judge(freq[7]); display_led(); } void f1Mhz(void) //1Mhz步进 { freq[6]=freq[6]+1; freq[6]=judge(freq[6]); display_led(); } void f100Khz(void) //100Khz步进 { freq[5]=freq[5]+1; freq[5]=judge(freq[5]); display_led(); } void f10Khz(void) //10Khz步进 { freq[4]=freq[4]+1; freq[4]=judge(freq[4]); display_led(); } void f1Khz(void) //1Khz步进 { freq[3]=freq[3]+1; freq[3]=judge(freq[3]); display_led(); } void f100Hz(void) //100hz步进 { freq[2]=freq[2]+1; if(freq[2]>=10) { freq[2]=0; freq[3]=freq[3]+1; } display_led(); } void f10Hz(void) //10hz步进 { freq[1]=freq[1]+1; freq[1]=judge(freq[1]); display_led(); } void f1Hz(void) //1hz步进 { freq[0]=freq[0]+1; freq[0]=judge(freq[0]); display_led(); } //-----------功能模式--------------------------- void carry_sin(void) //产生载波正弦波 { temp_r=jisuan(freq); longtoword(temp_r); write_ad9850(); //发送频率控制字 IntToStr(); Display_String(5,1,LCD_string); } void mod_sin(void) //产生调制信号正弦波 { temp_r=jisuan(freq); longtoword(temp_r); write_ad98501(); IntToStr(); Display_String(7,2,LCD_string); } void ma_step(void) { step_i++; if(step_i==10) { step_i=0; } AD7524=step[step_i]; LCD_step[0]=step_i+'0'; Display_String(7,3,LCD_step); Display_String(8,3,"0"); Display_String(9,3,"%"); } //--------------------------------------------------------------------------------------------------