fab.rar_FAB

#include "reg52.h" unsigned char code Duan[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f, 0x6f,0X76,0X3e,0x55,0x37,0x77,0x5e,0x72}; unsigned char Data_Buffer[4]={1,2,0,0}; unsigned char PinLV_Out=10;//范围:10-90hz unsigned char PinLV_In=0; unsigned char th0,tl0; sbit P10=P1^0; sbit P11=P1^1; sbit P12=P1^2; sbit P13=P1^3; sbit P23=P2^3; sbit P32=P3^2; sbit DOWN=P2^2; sbit UP=P2^1; bit flag=0; unsigned char temp_th1,temp_tl1; unsigned char count_t1=0,temp_count=0; void Comute_pinlv() { float t; unsigned int x; t=1000/PinLV_Out/2;//计算高\低宽度时间ms为单位 t=t*921.6; t=65535-t; x=t; th0=x/256; tl0=x%256; Data_Buffer[0]=PinLV_Out/10; Data_Buffer[1]=PinLV_Out%10; } void main() { unsigned char Bit=0; unsigned int xx; float t; bit x=1,y=1; Comute_pinlv(); TMOD=0x11; TH0=th0; TL0=tl0; TR0=1; ET0=1; EA=1; IT0=1; EX0=1; TR1=1; ET1=1; while(1) { if(UP==1)x=1;//频率增加 else if(x==1) { x=0; PinLV_Out+=5; if(PinLV_Out>90)PinLV_Out=90; Comute_pinlv(); //计算输出频率的定时器值 } if(DOWN==1)y=1;//频率减小 else if(y==1) { y=0; if(PinLV_Out>10) PinLV_Out-=5; Comute_pinlv(); } if(flag)//重新计算频率 { flag=0; xx=temp_th1*256+temp_tl1; t=xx+temp_count*65536; t=t/921.6;//921.6代码对应1ms t=1000/t; PinLV_In=t; Data_Buffer[2]=PinLV_In/10;//计算的频率在后两位数码管显示 Data_Buffer[3]=PinLV_In%10; } Bit++;//数码管扫描 if(Bit>=4)Bit=0; P1|=0x0f; P0=Duan[Data_Buffer[Bit]]; switch(Bit) { case 0: P10=0;break; case 1: P11=0;break; case 2: P12=0;break; case 3: P13=0;break; } } } void timer0() interrupt 1 //方波发生定时器 { TH0=th0; TL0=tl0; P23=!P23;//方波输出 P32=P23;//实际当中应用线连接 } void int0() interrupt 0 //外部中断，P32作测频。 { flag=1; //需要更新频率，即重新计算频率值 temp_th1=TH1;//临时存储计频数据 temp_tl1=TL1; temp_count=count_t1; TH1=0; //重新置0,重新启动方波宽度时间计时 TL1=0; count_t1=0; } void timer1() interrupt 3 { count_t1++; }