基于C51芯片的DDS跳频器C程序

/********************************************************** //10.6.8// AD9850并行驱动： ***********************************************************/ #include <reg52.h> #include <absacc.h> #include <intrins.h> #define uchar unsigned char #define uint unsigned int #define ulong unsigned long /****************51并行驱动接口****************/ #define dat P1 //数据口 #define set P2 //控制口 sbit fq_ud =P2^5; //上升沿将输入寄存器中40位控制字送入DDS内核 sbit rst =P2^6; //高电平复位 sbit clk =P2^7; //上升沿锁存控制字入40位输入寄存器 sbit flag1=P2^0; //设置跳频图案 sbit flag2=P2^1; sbit flag3=P2^2; sbit spd1=P2^3; //设置跳速 sbit spd2=P2^4; uint Z,Y,g_count=0; // 定义全局变量 uchar S,Q,phase_word=0x00,d[15][5]; //相位控制字，使用低5位 //uchar power_down=0x00; //低功耗模式 //uchar work_way=0x00; //uchar ww[5]={0x00,0x02,0x8F,0x5C,0x29}; ulong freq; /****************短延时**************************/ void delay_us(uint i) { while(i--); } /***************AD9850初始化********************/ //在此之前请确认D0,D1和D2的电平状态,并行工作方式000,串行工作方式需注意，为110，但需外接上下拉电阻； void init_dds(void) { rst=1; //高电平复位 delay_us(10000); //延时10mS rst=0; delay_us(10000); //延时10mS } /***************往,AD9850写数据**********************/ void write_dds(uint g_count) { uchar i; //ww[4]=dds&0xFF; //频率字最低字节 //ww[3]=(dds>>8)&0xFF; //ww[2]=(dds>>16)&0xFF; //ww[1]=dds>>24; //频率字最高字节 //ww[0]=phase_word; //控制字 //fq_ud=0; //FQ_UD置低 //clk=0; //CLK置低 for(i=0;i<5;i++) //送入5个字节的控制字 { dat=d[g_count][i]; delay_us(1); clk=1; delay_us(1); clk=0; delay_us(1); } fq_ud=1; //使能信号 delay_us(2); fq_ud=0; } /*************跳频图案******************/ void dds_flag(int i,int k) { int x,w; uchar idata a[3][5]={0x00,0x00,0x00,0x1E,0x32, //180 0X00,0x00,0x00,0x03,0x5A, //20 0x00,0x00,0x00,0x10,0xC6}; //100 uchar idata b[7][5]={0x00,0x11,0xEB,0x85,0x1E, //7M 0x00,0x07,0xAE,0x14,0x7A, //3M 0x00,0x0C,0xCC,0xCC,0xCC, //5M 0x00,0x05,0x1E,0xB8,0x51, //2M 0x00,0x02,0x8F,0x5C,0x28, //1M 0x00,0x0A,0x3D,0x70,0xA3, //4M 0x00,0x0F,0x5C,0x28,0xF5}; //6M uchar idata c[15][5]={0x00,0x00,0x0E,0xBE,0xDF, //22.5K 0x00,0x00,0x06,0xE1,0x9B, //10.5K 0x00,0x00,0x02,0xF2,0xF9, //4.5K 0x00,0x00,0x00,0xFB,0xA8, //1.5K 0x00,0x00,0x07,0xDD,0x44, //12K 0x00,0x00,0x03,0xEE,0xA2, //6K 0x00,0x00,0x01,0xF7,0x51, //3K 0x00,0x00,0x08,0xD8,0xEC, //13.5K 0x00,0x00,0x0B,0xCB,0xE6, //18K 0x00,0x00,0x05,0xE5,0xF3, //9K 0x00,0x00,0x0A,0xD0,0x3D, //16.5K 0x00,0x00,0x04,0xEA,0x4A, //7.5K 0x00,0x00,0x09,0xD4,0x95, //15K 0x00,0x00,0x0C,0xC7,0x8E, //19.5K 0x00,0x00,0x0D,0xC3,0x37}; //21K uchar xdata e[3][5]={0x00,0x00,0x00,0xA7,0xC5, //1000 0x00,0x00,0x00,0x21,0x8D, //200 0x00,0x00,0x00,0x64,0xA9}; //600 uchar xdata f[3][5]={0x00,0x00,0x09,0xD4,0x95, //15K 0x00,0x00,0x01,0xF7,0x51, //3K 0x00,0x00,0x05,0xE5,0xF3}; //9K if(k==1) {for(x=0;x<i;x++) { for(w=0;w<5;w++) { d[x][w]=a[x][w]; } } } if(k==2) {for(x=0;x<i;x++) { for(w=0;w<5;w++) { d[x][w]=b[x][w]; } } } if(k==3) {for(x=0;x<i;x++) { for(w=0;w<5;w++) { d[x][w]=c[x][w]; } } } if(k==4) {for(x=0;x<i;x++) { for(w=0;w<5;w++) { d[x][w]=e[x][w]; } } } if(k==5) {for(x=0;x<i;x++) { for(w=0;w<5;w++) { d[x][w]=f[x][w]; } } } } /*默认输出波形*/ void normal_start(void) { uchar ww[5]={0x00,0x02,0x8F,0x5C,0x29}; int i; fq_ud=0; //FQ_UD置低 clk=0; //CLK置低 for(i=0;i<5;i++) //送入5个字节的控制字 { dat=ww[i]; delay_us(2); clk=1; delay_us(2); clk=0; delay_us(2); } fq_ud=1; //使能信号 delay_us(3); fq_ud=0; } /*T1溢出中断处理函数*/ void timer1_int()interrupt 3 using 2 { /*时钟振荡频率为12MHZ*/ TH1=S; TL1=Q; write_dds(g_count); //Z=Z+1; g_count++; //if(g_count==Y) g_count=0; } void main() { uint i,j,k; uchar m,n ; //ulong dds; init_dds(); /*定时，中断初始化*/ TMOD=0x10; TH1=0x3C; TL1=0xB0; TR1=1; ET1=1; EA=1; while(1) { if((!flag1)&&(!flag2)&&(!flag3)) { normal_start(); while((!flag1)&&(!flag2)&&(!flag3)); } delay_us(50); m=set&0x07; n=set&0x18; switch(m) { case (0x01):Y=i=3;k=1;break; //case (0x03):Y=i=3;k=1;goto normal; //case (0x05):Y=i=3;k=1;goto normal; case (0x02):Y=i=7;k=2;break; //case (0x06):Y=i=7;k=2;goto normal; case (0x03):Y=i=3;k=4;break; case (0x04):Y=i=15;k=3;break; case (0x07):Y=i=3;k=5;break; default:normal_start();while(1); } dds_flag(i,k); switch(n) { case(0x08):S=0x3C;Q=0xB0;break; case(0x10):S=0xEC;Q=0x78;break; case(0x18):S=0xFD;Q=0x66;break; default:normal_start();while(1); } //if(spd1==1) {S=0x3C;Q=0xB0;} //每秒20跳 //else if(spd2==1) {S=0xFD;Q=0x66;} //else if((!spd1)&&(!spd2)){S=0xD8;Q=0xF0;} //默认跳速每秒100跳 while(1) { for(j=0;j<i;j++) { //x=j+1;//Z=j; while((j+1-g_count)!=0); if(g_count==Y) g_count=0; } } } }