//晶振:11.0592MHz //收数据 #include <AT89X52.h> sbit TSCLK=P3^3; sbit TSDAT=P1^6; sbit LED1=P2^0; sbit LED2=P2^1; sbit LED3=P2^2; sbit LED4=P2^3; sbit LED5=P2^4; sbit LED6=P2^5; sbit LED7=P2^6; sbit LED8=P2^7; sbit fmq=P3^6; //这是蜂鸣器 unsigned char num[4]={0,0,0,0}; unsigned char code DIS_SEG7[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e}; unsigned int lowtime,hightime; //延迟n毫秒 void delay(unsigned int n) { while (n--) { TH0=0xfc; TL0=0x66; //11.0592MHz TF0=0; TR0=1; while (TF0==0); TF0=0; } } void superdelay(unsigned char h, unsigned char l) { TH0=h; TL0=l; TF0=0; TR0=1; while (TF0==0); TR0=0; } //延迟半毫秒 void delay500us() { superdelay(0xfe,0x33); } //蜂鸣器 void beep() { unsigned char i; for (i=0;i<150;i++) { fmq=0; delay500us(); fmq=1; delay500us(); } } void receivebyte(unsigned char* Data) { unsigned char i; unsigned int time; for (i=0;i<8;i++) { *Data<<=1; //不应该在for循环的最后执行此操作,否则第一位会丢失 TH0=TL0=0; while (TSDAT==0); //跳过低电平 TR0=1; while (TSDAT==1 && TF0==0); //根据高电平长度判断是0还是1 TR0=0; time=TH0*256+TL0; if (time>950) *Data|=0x01; //读1 else *Data&=0xfe; //读0 } } void Display() { P0=0xff; LED1=0; P0=DIS_SEG7[num[0]/10]; delay(1); LED1=1; P0=0xff; LED2=0; P0=DIS_SEG7[num[0]%10]; delay(1); LED2=1; P0=0xff; LED3=0; P0=DIS_SEG7[num[1]/10]; delay(1); LED3=1; P0=0xff; LED4=0; P0=DIS_SEG7[num[1]%10]; delay(1); LED4=1; P0=0xff; LED5=0; P0=DIS_SEG7[num[2]/10]; delay(1); LED5=1; P0=0xff; LED6=0; P0=DIS_SEG7[num[2]%10]; delay(1); LED6=1; P0=0xff; LED7=0; P0=DIS_SEG7[num[3]/10]; delay(1); LED7=1; P0=0xff; LED8=0; P0=DIS_SEG7[num[3]%10]; delay(1); LED8=1; } void main() { TMOD=0x01; //定时器2工作于16位查询工作方式 TR0=0; EA=1; EX1=1; IT1=1; while (1) { P1_7=0; Display(); P1_7=1; } } void int1() interrupt 2 { EX1=0; //检测引导码 //数据线1ms低电平和2.5ms高电平 TH0=TL0=0; TR0=1; while (TSDAT==0); TR0=0; lowtime=TH0*256+TL0; TH0=TL0=0; TR0=1; while (TSDAT==1); TR0=0; hightime=TH0*256+TL0; //对于低电平:1000us/1.085=921,实际值通常为934 //对于高电平:2500/1.085=2304,实际值通常为2365或2367 if (lowtime>880 && lowtime<980 && hightime>2300 && hightime<2400) { receivebyte(&num[0]); receivebyte(&num[1]); receivebyte(&num[2]); receivebyte(&num[3]); delay500us(); //全部数据接收完毕后,等待时钟线拉高,防止再次进入本中断 } else beep(); //引导码不合法 EX1=1; }
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