基于51单片机 正弦波信号发生器及回测

#include<public.h> #define dac0832 XBYTE[0x7fff] sbit P3_0=P3^0; sfr16 RCAP2 = 0xCA; //T2捕获寄存器 sfr T2MOD = 0xC9; float freq_test=99; uint freq_test1=50,Now=20000; uint freq=50,time_0=0,freq_10,freq_50,freq_100; char th0,tl0,vaule=0; uchar sin_point=0,sin_count=0,flag=0; uchar code sin[]={0x7F,0x8B,0x98,0xA4,0xB0,0xBB,0xC6,0xD0,0xD9,0xE2,0xE9,0xEF,0xF5,0xF9,0xFC,0xFE ,0xFE,0xFE,0xFC,0xF9,0xF5,0xEF,0xE9,0xE2,0xD9,0xD0,0xC6,0xBB,0xB0,0xA4,0x98,0x8B ,0x7F,0x73,0x66,0x5A,0x4E,0x43,0x38,0x2E,0x25,0x1C,0x15,0x0F,0x09,0x05,0x02,0x00 ,0x00,0x00,0x02,0x05,0x09,0x0F,0x15,0x1C,0x25,0x2E,0x38,0x43,0x4E,0x5A,0x66,0x73 ,0x7F}; uchar code sin_256[]={ 0x7F,0x82,0x85,0x88,0x8B,0x8F,0x92,0x95,0x98,0x9B,0x9E,0xA1,0xA4,0xA7,0xAA,0xAD ,0xB0,0xB3,0xB6,0xB8,0xBB,0xBE,0xC1,0xC3,0xC6,0xC8,0xCB,0xCD,0xD0,0xD2,0xD5,0xD7 ,0xD9,0xDB,0xDD,0xE0,0xE2,0xE4,0xE5,0xE7,0xE9,0xEB,0xEC,0xEE,0xEF,0xF1,0xF2,0xF4 ,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFB,0xFC,0xFD,0xFD,0xFE,0xFE,0xFE,0xFE,0xFE ,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFD,0xFD,0xFC,0xFB,0xFB,0xFA,0xF9,0xF8,0xF7,0xF6 ,0xF5,0xF4,0xF2,0xF1,0xEF,0xEE,0xEC,0xEB,0xE9,0xE7,0xE5,0xE4,0xE2,0xE0,0xDD,0xDB ,0xD9,0xD7,0xD5,0xD2,0xD0,0xCD,0xCB,0xC8,0xC6,0xC3,0xC1,0xBE,0xBB,0xB8,0xB6,0xB3 ,0xB0,0xAD,0xAA,0xA7,0xA4,0xA1,0x9E,0x9B,0x98,0x95,0x92,0x8F,0x8B,0x88,0x85,0x82 ,0x7F,0x7C,0x79,0x76,0x73,0x6F,0x6C,0x69,0x66,0x63,0x60,0x5D,0x5A,0x57,0x54,0x51 ,0x4E,0x4B,0x48,0x46,0x43,0x40,0x3D,0x3B,0x38,0x36,0x33,0x31,0x2E,0x2C,0x29,0x27 ,0x25,0x23,0x21,0x1E,0x1C,0x1A,0x19,0x17,0x15,0x13,0x12,0x10,0x0F,0x0D,0x0C,0x0A ,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x03,0x02,0x01,0x01,0x00,0x00,0x00,0x00,0x00 ,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x02,0x03,0x03,0x04,0x05,0x06,0x07,0x08 ,0x09,0x0A,0x0C,0x0D,0x0F,0x10,0x12,0x13,0x15,0x17,0x19,0x1A,0x1C,0x1E,0x21,0x23 ,0x25,0x27,0x29,0x2C,0x2E,0x31,0x33,0x36,0x38,0x3B,0x3D,0x40,0x43,0x46,0x48,0x4B ,0x4E,0x51,0x54,0x57,0x5A,0x5D,0x60,0x63,0x66,0x69,0x6C,0x6F,0x73,0x76,0x79,0x7C}; void time_2() interrupt 5 { if(EXF2) { if(vaule==2) { EXF2=0;//外部标志位需要软件清零； Now=RCAP2; vaule=0; } else { EXF2=0; vaule++; TH2=0; TL2=0; } } else { TF2=0; } } void time0() interrupt 1 { TH0=th0; TL0=tl0; switch(flag) { case 0:if(sin_point>64)sin_point=0;dac0832=sin[sin_point++];break; case 1:if(sin_point>255)sin_point=0;dac0832=sin_256[sin_point];sin_point+=freq_10;break; case 2:if(sin_point>255)sin_point=0;dac0832=sin_256[sin_point];sin_point+=freq_50;break; // case 3:if(sin_point>255)sin_point=0;dac0832=sin_256[sin_point];sin_point+=freq_100;break; } } void main() { uint j=0; system_init(); while(1) { if(freq<123) flag=0; else if(freq<227) flag=1; else flag=2; switch(flag) { case 0: if(freq<53) { th0=(65536-time_0+10)/256; tl0=(65536-time_0+10)%256; } else if(freq>=53&&freq<123) { th0=(65536-time_0+40)/256; tl0=(65536-time_0+40)%256; } break; case 1: time_0=390; //10hz理论值390.6 th0=(65536-time_0+50)/256; tl0=(65536-time_0+50)%256; break; case 2: time_0=78;//50hz理论值78 th0=(65536-time_0+30)/256; tl0=(65536-time_0+30)%256; break; } freq_10=freq/10; freq_50=freq/50-1; freq_100=freq/100-1; keycode_return(); } } void system_init() { //************显示初始化***********// display_init(); //************设置频率输出**************// //************定时器0初始化*************// time_0=13604/freq; //理论值15624 th0=(65536-time_0+15)/256; tl0=(65536-time_0+15)%256; TH0=th0; TL0=tl0; ET0=1; TMOD=0x01; EA=1; TR0=1; //************频率测量T2初始化**********// ET2=1;//开T2中断 T2MOD=0X00; T2CON=0x0d;//16位捕获模式,定时，外部使能 TH2=0; TL2=0; }