boxingfashengqi.zip_基于51正弦波_波形发生器

#include<reg52.h> #include<intrins.h> #define PCF8591 0x90 //#define frequency unsigned int sbit SDA=P3^7; sbit SCL=P3^6; bit ack; #include<i2c.h> #include<biao.h> sbit P20 = P2^0; //信号选择 sbit P21 = P2^1; //模式选择 sbit P22 = P2^2; //数字加 sbit P32 = P3^2; //数字减 sbit P10 = P1^0; void keyscan(); void Delay(); unsigned int frequency = 1000; //频率 unsigned char flag = 0; //对信号的选择，0为fangbo，1位正弦，2位三角波，3位锯齿波 bit mode = 0; //0为对频率的操作，1为对幅值的操作 unsigned char K_count = 0; //发送数据的顺序 unsigned char M_flag = 3; //幅值的选择 float code multiple[4]={0.2,0.5,0.7,1}; unsigned char *dadata ; //发送信号的选择 //bit DACconversion() unsigned char DACconversion(unsigned char sla,unsigned char c, unsigned char Val) { Start_I2c(); SendByte(sla);//dizhi // Ack_I2c(); if(ack==0) return 0; SendByte(c); //控制字 // Start_I2c(); // SendByte(0x91); // Ack_I2c(); if(ack==0) return 0; // RcvByte(); // Val=RcvByte(); // Ack_I2c(1); //发送非就答位 SendByte(Val); Stop_I2c(); return Val; } void main() { TMOD=0x11; //设置定时器0工作模式,16位计数模式 TH0 = (65535 - frequency)/256; TL0 = (65535 - frequency)%256; TR0=1; //启动定时器 ET0=1; //使能定时器中断 EA=1; //开总中断 dadata = fangbo_Table; while(1) { keyscan(); } } void timer0() interrupt 1 //频率控制 { TH0 = (65535 - frequency)/256; TL0 = (65535 - frequency)%256; DACconversion(0x90,0x40,(unsigned char)(multiple[M_flag]*dadata[K_count++])); if(K_count>=64) K_count=0; } void keyscan() { if(P20==0||P21==0||P22==0||P32==0) { Delay(); //软件消抖 if(P20 == 0) { flag++; if(flag >=4) flag = 0; switch(flag) //波形选择，0方波，1正弦波，2三角波，3锯齿波 { case 0:dadata = fangbo_Table;break; case 1:dadata = sin_Table;break; case 2:dadata = sanjiao_Table;break; case 3:dadata = jvchi_Table;break; default:break; } } if(P21 == 0) { P10 = ~P10; mode = ~mode; //两个模式，对频率，对幅值。 } if(P22==0||P32==0) { if(mode == 1) //1对幅值进行操作 { if(P22==0) { M_flag++; if(M_flag >=4) M_flag = 0; } } else if(mode == 0) //0对频率进行操作 { if(P22==0) { frequency+=1000; if(frequency>10000) frequency = 1000; } if(P32==0) { frequency-=1000; if(frequency<1000) frequency = 1000; } } } } } void Delay() { unsigned int i; for(i=0; i<10; i++); }