基于单片机的点阵广告屏AT89S52单片机为核心，由键盘、驱动电路、LED屏幕显示等功能模块组成。

/*************************************************/ #include<reg51.h> #include <intrins.h> #define uchar unsigned char #define uint unsigned int /*************************************************/ sbit hc595_ds=P2^0; sbit hc595_shcp=P2^1; sbit hc595_stcp=P2^2; sbit P2_4=P2^4; sbit P2_5=P2^5; sbit P2_6=P2^6; sbit P2_7=P2^7; sbit OE =P3^3; sbit LE =P3^7; uchar flag_left,flag_right,flag_up,flag_down; uchar dispram[8]; uchar code table[]={ 0xFF,0xFF,0xFF,0xE7,0xDB,0xBD,0xBD,0xBD, 0xBD,0xBD,0xBD,0xBD,0xDB,0xE7,0xFF,0xFF,/*"0",0*/ 0xFF,0xFF,0xFF,0xE7,0xDB,0xBD,0xBD,0xBD, 0xBD,0xBD,0xBD,0xBD,0xDB,0xE7,0xFF,0xFF,/*"0",1*/ 0x00,0x00,0x00,0x00,0x00,0x00,0x18,0x18,0x24,0x24, 0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42, 0x42,0x24,0x24,0x18,0x18,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x18,0x18,0x24,0x24, 0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42, 0x42,0x42,0x42,0x42,0x24,0x24,0x18,0x18,0x00,0x00,0x00,0x00,//00 }; /*************************************************/ void hc595_write_data(uchar data_ds);// void hc595_display(); void delay(uint n); void key_scan(); void shift_L(); void shift_R(); /*************************************************/ void main() { uchar i,j,k,num_l,num_r,n=0; while(1) { char a1; a1=0; for(i=0;i<16;i++) { for(j=0;j<6;j++) { P1=0xfe; P0=0xfe ; for(k=0;k<16;k++) { key_scan(); dispram[0]=table[2*k+1]; dispram[1]=table[2*k]; dispram[2]=table[2*k+33]; dispram[3]=table[2*k+32]; if(k<8) P0=_crol_(P1,1); else P1=_crol_(P1,1); if(flag_left==1) {num_l=n;for(;num_l>0;num_l--)shift_L();} if(flag_right==1) {num_r=n;for(;num_r>0;num_r--)shift_R();} hc595_write_data(dispram[0]); hc595_write_data(dispram[1]); hc595_write_data(dispram[2]); hc595_write_data(dispram[3]); if(flag_up==1) {LE=1; if(k<8) P0=_crol_(P1,1); if(k>7) P1=_crol_(P1,1);} else if(flag_down==1) { LE=1; if(k<8) P0=_crol_(P1,1); if(k>7) P1=_crol_(P1,1);} hc595_display(); } } n++; if(n==32)n=0; } } } /*************************************************/ void hc595_write_data(uchar data_ds) { uchar n_bit; for(n_bit=0;n_bit<8;n_bit++) { hc595_shcp=0;//禁止列数据输出 hc595_ds=data_ds&(1<<n_bit); hc595_shcp=1; } } /*************************************************/ void hc595_display() { hc595_stcp=0; delay(1); hc595_stcp=1; } /*************************************************/ void delay(uint n) { while(n--); } /*************************************************/ void key_scan() { if(P2_4==0)delay(10); if(P2_4==0){flag_left=1;flag_right=0;flag_up=0;flag_down=0;} if(P2_5==0)delay(10); if(P2_5==0){flag_right=1;flag_left=0,flag_up=0;flag_down=0;} if(P2_6==0)delay(10); if(P2_6==0){flag_up=1;flag_left=0,flag_right=0;flag_down=0;} if(P2_7==0)delay(10); if(P2_7==0){flag_down=1;flag_left=0;flag_right=0;flag_up=0;} } /*************************************************/ void shift_L() //循环左移 { bit hbit; uchar i; hbit=dispram[0]&0x80; for(i=0;i<3;i++) { dispram[i]=dispram[i]<<1; dispram[i]+=dispram[i+1]>>7; } dispram[3]=dispram[3]<<1; if(hbit)dispram[3]+=0x01; } /*************************************************/ void shift_R() //右移函数 { bit lbit; uchar i; lbit=dispram[3]&0x01; //保存最低位 for(i=3;i>0;i--) { dispram[i]=dispram[i]>>1; //右移一位 dispram[i]+=dispram[i-1]<<7; } dispram[0]=dispram[0]>>1; if(lbit)dispram[0]+=0x80; } /*************************************************/