基于51单片机的三角波信号发生器设计

#include <reg51.h> #include<string.h> #define uchar unsigned char #define uint unsigned int //--LCD控制引脚 sbit RS=P3^0; sbit RW=P3^1; sbit EN=P3^3; //--按键 sbit K1=P2^0; sbit K2=P2^1; sbit K3=P2^2; sbit K4=P2^3; sbit K5=P2^4; uchar WaveChoice=1; uchar ys=30; uchar i,a=0; uchar sqar_num=128; uint freq; //uchar code Sin[]={"Sine "}; //uchar code exp[]={"Exp "}; //uchar code Squ[]={"Square "} ; uchar code Tri[]={"Triangle "}; //uchar code Saw[]={"Sawtooth "} ; uchar code No[]={"No Signal out "}; uchar code Wave[]={"Wave :"}; uchar code Fre[]={"Freq :"}; uchar code tosin[256]= {0x80,0x83,0x86,0x89,0x8d,0x90,0x93,0x96,0x99,0x9c,0x9f,0xa2,0xa5,0xa8,0xab, 0xae,0xb1,0xb4,0xb7,0xba,0xbc,0xbf,0xc2,0xc5,0xc7,0xca,0xcc,0xcf,0xd1,0xd4,0xd6,0xd8, 0xda,0xdd,0xdf,0xe1,0xe3,0xe5,0xe7,0xe9,0xea,0xec,0xee,0xef,0xf1,0xf2,0xf4, 0xf5,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfd,0xfe,0xff,0xff,0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff,0xff,0xff,0xfe,0xfd,0xfd,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5, 0xf4,0xf2,0xf1,0xef,0xee,0xec,0xea,0xe9,0xe7,0xe5,0xe3,0xe1,0xde,0xdd,0xda,0xd8, 0xd6,0xd4,0xd1,0xcf,0xcc,0xca,0xc7,0xc5,0xc2,0xbf,0xbc,0xba,0xb7,0xb4,0xb1,0xae,0xab, 0xa8,0xa5,0xa2,0x9f,0x9c,0x99,0x96,0x93,0x90,0x8d,0x89,0x86,0x83,0x80, 0x80,0x7c,0x79,0x76,0x72,0x6f,0x6c,0x69,0x66,0x63,0x60,0x5d,0x5a,0x57,0x55, 0x51,0x4e,0x4c,0x48,0x45,0x43,0x40,0x3d,0x3a,0x38,0x35,0x33,0x30,0x2e,0x2b, 0x29,0x27,0x25,0x22,0x20,0x1e,0x1c,0x1a,0x18,0x16,0x15,0x13,0x11,0x10,0x0e, 0x0d,0x0b,0x0a,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02 ,0x02,0x03,0x04, 0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0d,0x0e,0x10,0x11,0x13,0x15,0x16,0x18, 0x1a,0x1c,0x1e,0x20,0x22,0x25,0x27,0x29,0x2b,0x2e,0x30,0x33,0x35,0x38,0x3a, 0x3d,0x40,0x43,0x45,0x48,0x4c,0x4e ,0x51,0x55,0x57,0x5a,0x5d,0x60,0x63,0x66 , 0x69,0x6c,0x6f,0x72,0x76,0x79,0x7c,0x80 }; //正弦波码 //--延时MS void DelayMS(uchar ms) { uchar i; while(ms--) for(i=0;i<120;i++); } //--延时y*9us void Delay1(uint y) { uint i; for(i=y;i>0;i--); } //------------- //忙检查 //----------------------------- uchar Busy_Check() { uchar LCD_Status; RS=0; // 寄存器选择 RW=1; //读状态寄存器 EN=1; // 开始读 DelayMS(1); LCD_Status=P1; EN=0; return LCD_Status; } //---------------------------- //写LCD命令 //--------------------------------- void Write_LCD_Command(uchar cmd) { while((Busy_Check()&0x80)==0x80); //忙等待 RS=0; //选择命令寄存器 RW=0; //写 EN=0; P1=cmd;EN=1;DelayMS(1);EN=0; } //-------------------------------------- //发送数据 //--------------------------------------- void Write_LCD_Data(uchar dat) { while((Busy_Check()&0x80)==0x80); //忙等待 RS=1; RW=0; EN=0; P1=dat;EN=1;DelayMS(1);EN=0; } //------------------------------------ //LCD初始化 //----------------------------------------- void Init_LCD() { Write_LCD_Command(0x38); DelayMS(1); Write_LCD_Command(0x01); //清屏 DelayMS(1); Write_LCD_Command(0x06); //字符进入模式：屏幕不动，字符后移 DelayMS(1); Write_LCD_Command(0x0C); //显示开、关光标 DelayMS(1); } //--向LCD写频率值 void Write_freq(uint k) { uchar qian,bai,shi,ge; qian=k/1000; bai=k/100%10; shi=k/10%10; ge=k%10; Write_LCD_Command(0x86+0x40); Write_LCD_Data(0x30+qian); Write_LCD_Data(0x30+bai); Write_LCD_Data(0x30+shi); Write_LCD_Data(0x30+ge); Write_LCD_Data(0x48); Write_LCD_Data(0x5a); } //--LCD上显示不同波形频率 void Xianshi_f() { if(WaveChoice==1) { freq=(10000000/(100000+2860*ys)); Write_freq(freq); } // if(WaveChoice==2) // { // freq=(10000000/(800000+2300*ys)); // Write_freq(freq); // } if(WaveChoice==2) { freq=(10000000/(14000+2300*ys)); Write_freq(freq); } // if(WaveChoice==4) // { // freq=(10000000/(15000+2300*ys)); // Write_freq(freq); // } } //--LCD上写波形类型 void Write_wave(uchar t ) { switch(t) { case 0: //-- 无输出 Write_LCD_Command(0x86); DelayMS(5); for (i=0;i<sizeof(No)-1;i++) { Write_LCD_Data(No[i]); DelayMS(5); } break; case 1: //---三角波 ys=30; Write_LCD_Command(0x86); DelayMS(5); for (i=0;i<sizeof(Tri)-1;i++) { Write_LCD_Data(Tri[i]); DelayMS(5); } break; } } //---输出波形 void Out_Wave(uchar i) { uchar j; switch(i) { case 0: P0=0x00;break; case 1: //----三角波 { if(a<128) { P0=a; Delay1(ys); } else { P0=255-a; Delay1(ys); } a++; } break; } } //----按键扫描 void keyscanf() { if(K2==0) { DelayMS(5); if(K2==0) { while(!K2); ys--; if(ys==0) ys=20; } } if(K3==0) { DelayMS(5); if(K3==0) { while(!K3); ys++; if(ys>22) ys=20; } } if(K4==0) { DelayMS(5); if(K4==0) { while(!K4); if(WaveChoice==2) sqar_num=sqar_num+2; if(sqar_num==238) sqar_num=128; } } if(K5==0) { DelayMS(5); if(K5==0) { while(!K5); if(WaveChoice==2) sqar_num=sqar_num-2; if(sqar_num==18) sqar_num=128; } } } //----主程序--- void main() { Init_LCD(); IE=0X81; IT0=1; Write_LCD_Command(0x80);//--显示wave: DelayMS(5); for (i=0;i<sizeof(Wave)-1;i++) { Write_LCD_Data(Wave[i]); DelayMS(5); } Write_LCD_Command(0x80+0X40);//----显示freq: DelayMS(5); for (i=0;i<sizeof(Fre)-1;i++) { Write_LCD_Data(Fre[i]); DelayMS(5); } Write_wave(WaveChoice); while (1) { keyscanf(); Out_Wave(WaveChoice); if(!(K1&K2&K3)) Xianshi_f(); } } //---INT0中断 void EX_INT0() interrupt 0 { WaveChoice++; if(WaveChoice==5) WaveChoice=1; Write_wave(WaveChoice); }