上海电机学院单片机实验程序汇总

实验二 报警与流水灯控制 #include"reg51.h" #include"intrins.h" sbit P3_7=P3^7; sbit P3_2=P3^2; void dely() //using 0 //延迟n秒 //void dely(unsigned int t) //using 0 //延迟n秒 { unsigned int i,j; for(i=0;i<4;i++) for(j=0;j<50000;j++);//0.01s } void int1_warning() interrupt 0 //using 0 { unsigned int i; for(i=0;i<3;i++) { P3_7=1; dely(); P3_7=0; } } void main() { unsigned char a[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}; unsigned int i,j,LED; EA=1;//CPU中断开 EX0=1;//INT0中断允许 IT0=0;//中断触发方式 0:低电平触发; 1:下降沿触发 P3_7=0; while(1) { P3_2=1; LED=0x01; for(i=0;i<8;i++) { P1=a[i]; dely();//延迟 } } }实验三 3-8译码器 #include main() { void delay(); unsigned char a[ ]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}; unsigned int c; sbit P2_0=P2^0; sbit P2_1=P2^1; sbit P2_2=P2^2; c=(P2_2)*4+(P2_1)*2+(P2_0)*1; while(1) { switch(c) { case 0: P1=a[0];break; case 1: P1=a[1];break; case 2: P1=a[2];break; case 3: P1=a[3];break; case 4: P1=a[4];break; case 5: P1=a[5];break; case 6: P1=a[6];break; case 7: P1=a[7];break; } } } void delay() { unsigned int i,j; for(i=0;i<10;i++) { for(j=0;j<5000;j++); } } 实验四 交通灯控制 #include int n,count,flag,P3_2; void main() { P3_2=P3^2; TMOD=0x01; TH0=0xD8; TL0=0xf0; EA=1;ET0=1; EX0=1; if(P3_2==0) {IT0=1;} n=0; TR0=1; flag=0; while(1) { if (flag==0) { switch(n) { case 0:{P1=0xf3;count=1000;break;} case 1:{P1=0xdc;count=300;break;} case 2:{P1=0xcd;count=1000;break;} case 3:{P1=0xdc;count=300;break;}} } } } } void int0_fun(void) interrupt 0 { P1=0x76; } void time0_int(void) interrupt 1 { { flag=1; TH0=0xD8; TL0=0Xf0; count--; if(count==0) {flag=0; n++; if(n>3)n=0; } } }实验五 时钟秒表技术 #include #define uchar unsigned char unsigned int delay,i,j; sbit com4=P3^5; sbit com3=P3^4; code uchar a[]={0x10,0xf9,0xc4,0xb0,0x99,0x82,0xf8,0x80,0x90}; code uchar b[]={0xf9,0xc4,0xb0,0x99,0x82,0xf8}; void main() { TMOD=0X01; TL0=(65536-50000)%256; TH0=(65536-50000)/256; ET0=1; EA=1; delay=0; i=0;j=0; TR0=1; while(1) { com4=1; com3=0; P0=a[i]; } } void timer0() interrupt 1 { TL0=(65536-50000)%256; TH0=(65536-50000)/256; delay++; if(delay==19){i++;delay=0;} if(i==9) { P0=b[j];com4=0;com3=1; i=0;j++; } if(j==6) j=0; } 实验六 键盘接口技术 #include #define uchar unsigned char #define uint unsigned int sbit P3_4=P3^4; sbit P3_5=P3^5; code uchar Table1[12]={0xb7,0xbb,0xbd,0xbe,0xd7,0xdb,0xdd,0xde,0xe7,0xeb,0xed,0xee}; code uchar Table2[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; int fastfound( ) { uchar keyin,n; P2=0x0f; keyin=P2; keyin=keyin&0x0f; if(keyin!=0x0f) for(n=0;n<200;n++); if(keyin!=0x0f) return(1); else return(0); } int keyfound( ) { uchar keyvalue,keyin_i,keyin_j,keyin; uchar k; P2=0x0f; keyin_j=P2; keyin_j=keyin_j&0x0f; P2=0xf0; keyin_i=P2; keyin_i=keyin_i&0xf0;