LED点阵字符驱动显示实验报告

LED点阵字符驱动显示实验 郑家贵110800533陈鹤110800524一实验目的掌握用CPU控制扫描的方法实现点阵LED显示器的字符、图形的显示。掌握用单片机进行显示系统开发的方法。了解大容量显示器点阵图形显示驱动扩展的一般方法。二实验仪器单片机最小系统，电源模块，8*8点阵LED显示器四块，AT89C51单片机，74HC154N两片，HD74LSO4P一片，100排阻等。三设计思想用单片机的P1.0-P1.4和P2.0-P2.7共13个输出口来传递数据码，其中P1.0-P1.3分别接4线-16线译码器的四个数据输入端（A、B、C、D），P1.4作为片选输出信号，当P1.4为高电平时，U2工作，U3不工作；当P1.4为低电平输出，U2不工作，U3工作。信号经过74HC154N译码后输出，再接至4片点阵LED的行信号输入端，而列信号由单片机的P2口直接控制。1、系统框图：图1：16X16点阵硬件电路图2、单片机最小系统：上图是51单片机的最小系统。将程序烧写进单片机后，便可以实现对硬件系统的控制。3、LED点阵显示屏：上图即显示屏，是由4块8*8LED点阵级联，成为16*16LED点阵。由单片机控制，按照程序中的控制命令和字模数据表输出相应汉字，同时按一定速率流动，显示多个汉字。4、74HC154N工作原理：74HC154N为4线—16线译码器，可以实现地址的扩展。引脚说明：1-11，3-17：输出端（outputs）12：Gnd电源地（ground）18-19：使能输入端、低电平有效(enableinputs)20-23地址输入端(addressinputs)24：VCC电源正(positivesupplyvoltage)四设计的电路样品的照片如图下图所示五实验结论及心得：通过和同伴的一致努力，最终完成了整个电路的设计。虽然实现的功能并不多，但是在焊制整个电路时，总会出现各种问题，在解决这些问题的过程中对各模块进行调试，最终实现设计目标。16X16点阵字符显示利用人眼视觉残留效应，实现LED字符稳定显示。显示驱动原理先送行扫描一位后立即送列数据直到16位数据送完，当时钟足够快时看到的就是完整的字符了。因为采用了16X16而MCU为8位，故在送数据时应送2次。通过这次试验，让我对单片机的使用产生了更大的兴趣，也对自己的动手能力有了更大的信心。实验程序参考电子版#include<AT89X52.h>#defineucharunsignedchar#defineuintunsignedintuchartable1[]={0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,/*"_",0*/0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,/*"_",1*/};/*上移显示的字符*/ ucharcodetable[]={0x00,0x00,0xFE,0xFF,0x22,0x04,0x5A,0x08,0x86,0x07,0x08,0x20,0x88,0x11,0x68,0x0D,0x18,0x41,0x0F,0x81,0xE8,0x7F,0x08,0x01,0x08,0x05,0x08,0x09,0x08,0x30,0x00,0x00,/*"陈",0*/0x00,0x02,0x02,0x02,0x0C,0x7F,0xC0,0x00,0x00,0x10,0x20,0x08,0x20,0x06,0xE0,0x41,0x00,0x80,0xFF,0x7F,0x70,0x00,0xA0,0x01,0x10,0x06,0x08,0x08,0x00,0x10,0x00,0x00,/*"冰",1*/0x04,0x01,0x84,0x00,0xC4,0xFF,0x34,0x00,0x04,0x00,0x2F,0x1F,0x24,0x11,0x24,0x11,0x24,0x11,0x2F,0x1F,0x24,0x40,0x24,0x80,0xE4,0x7F,0x24,0x00,0x24,0x00,0x00,0x00,/*"荷",2*/0x00,0x00,0x10,0x20,0x10,0x20,0xF8,0x3F,0x00,0x20,0x00,0x20,0x00,0x00,0x00,0x00,/*"1",3*/0x00,0x00,0x10,0x20,0x10,0x20,0xF8,0x3F,0x00,0x20,0x00,0x20,0x00,0x00,0x00,0x00,/*"1",4*/0x00,0x00,0xE0,0x0F,0x10,0x10,0x08,0x20,0x08,0x20,0x10,0x10,0xE0,0x0F,0x00,0x00,/*"0",5*/0x00,0x00,0x70,0x1C,0x88,0x22,0x08,0x21,0x08,0x21,0x88,0x22,0x70,0x1C,0x00,0x00,/*"8",6*/0x00,0x00,0xE0,0x0F,0x10,0x10,0x08,0x20,0x08,0x20,0x10,0x10,0xE0,0x0F,0x00,0x00,/*"0",7*/0x00,0x00,0xE0,0x0F,0x10,0x10,0x08,0x20,0x08,0x20,0x10,0x10,0xE0,0x0F,0x00,0x00,/*"0",8*/0x00,0x00,0xF8,0x19,0x08,0x21,0x88,0x20,0x88,0x20,0x08,0x11,0x08,0x0E,0x00,0x00,/*"5",9*/0x00,0x00,0x70,0x30,0x08,0x28,0x08,0x24,0x08,0x22,0x88,0x21,0x70,0x30,0x00,0x00,/*"2",10*/0x00,0x00,0xE0,0x0F,0x10,0x10,0x08,0x20,0x08,0x20,0x10,0x10,0xE0,0x0F,0x00,0x00,/*"0",11*///至此字模插入结束0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};ucharcodetable2[]={0x40,0x00,0x42,0x00,0xCC,0x3F,0x00,0x10,0x00,0x2A,0xFC,0x13,0x56,0x4A,0x55,0x86,0xFC,0x7F,0x80,0x00,0x10,0x43,0x10,0x80,0xFF,0x7F,0x10,0x00,0x10,0x00,0x00,0x00,/*"谢",0*/0x00,0x20,0xC2,0x10,0xBA,0x08,0x82,0x46,0x82,0x81,0xFE,0x7F,0xA2,0x00,0x90,0x00,0xFC,0xFF,0x4B,0x22,0x48,0x22,0xF9,0x3F,0x4A,0x22,0x48,0x22,0x08,0x20,0x00,0x00,/*"雅",1*/0x00,0x01,0x80,0x00,0x60,0x00,0xF8,0xFF,0x47,0x40,0x40,0x40,0x44,0x44,0x44,0x44,0x44,0x44,0x7F,0x7F,0x44,0x44,0x44,0x44,0x44,0x44,0x44,0x44,0x40,0x40,0x00,0x00,/*"佳",2*/0x00,0x00,0x10,0x20,0x10,0x20,0xF8,0x3F,0x00,0x20,0x00,0x20,0x00,0x00,0x00,0x00,/*"1",3*/0x00,0x00,0x10,0x20,0x10,0x20,0xF8,0x3F,0x00,0x20,0x00,0x20,0x00,0x00,0x00,0x00,/*"1",4*/0x00,0x00,0xE0,0x0F,0x10,0x10,0x08,0x20,0x08,0x20,0x10,0x10,0xE0,0x0F,0x00,0x00,/*"0",5*/0x00,0x00,0x70,0x1C,0x88,0x22,0x08,0x21,0x08,0x21,0x88,0x22,0x70,0x1C,0x00,0x00,/*"8",6*/0x00,0x00,0xE0,0x0F,0x10,0x10,0x08,0x20,0x08,0x20,0x10,0x10,0xE0,0x0F,0x00,0x00,/*"0",7*/0x00,0x00,0xE0,0x0F,0x10,0x10,0x08,0x20,0x08,0x20,0x10,0x10,0xE0,0x0F,0x00,0x00,/*"0",8*/0x00,0x00,0xF8,0x19,0x08,0x21,0x88,0x20,0x88,0x20,0x08,0x11,0x08,0x0E,0x00,0x00,/*"5",9*/0x00,0x00,0x00,0x07,0xC0,0x04,0x20,0x24,0x10,0x24,0xF8,0x3F,0x00,0x24,0x00,0x00,/*"4",10*/0x00,0x00,0xE0,0x0F,0x10,0x11,0x88,0x20,0x88,0x20,0x18,0x11,0x00,0x0E,0x00,0x00,/*"6",11*///至此字模插入结束0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}; /*逐屏显示字符*/ucharv,flag,temp;uchari,j,k,shuz,shub,temp1;uchara,b,c,d,e,f,numa,numb;ucharii,jj,kk;uchariii,jjj,kkk;uchara3,b3;ucharnum3,temp3;uchartemp2; intzw; /*各变量值的初始化*/voidinit(); /*主函数的初始化声名*/ voidinit1(); /*左移显示方式的初始化声名*/voidinit2(); /*上移显示方式的初始化声名*/voidinit3(); /*逐屏显示方式的初始化声名*/voiddisp1(); /*左移显示子程序声名*/ voiddisp2(); /*上移显示子程序声名*/voiddisp3(); /*逐屏显示子程序声名*/voiddelay(uintz)/*延时函数声名及定义*/{ uintx,y;for(x=z;x>0;x--) { for(y=110;y>0;y--);}} voidmain(){ init(); flag=0; P0=0xFF; P2=0XFF; P1_3=0; P1=0x00; for(zw=0;zw<2;zw++) { for(;(P1&0x07)<0x07;P1++) delay(350); P1=P1|0x07; delay(350); P1_3=~P1_3; P1=P1&0xF8; } flag=1;//选择当前显示方式为上移显示 init2(); //上移显示初始化 for(ii=0;ii<=15;ii++) //上移缓冲 { for(jj=0;jj<=v;jj++) //向上移动的速度由变量v控制 { for(kk=0;kk<=15;kk++) //显示一幕 disp2(); //若没有中断调用左移显示子程序 delay(1); } } flag=0; //选择当前显示方式为左移显示 init1(); //左移显示初始化 for(i=0;i<=a;i++) //判断左移的字符个数 for(j=0;j<=v;j++) //向左移动的速度由变量v控制 for(k=i*2;k<(i*2+32);) //显示一幕 disp1(); //若没有中断调用左移显示子程序 flag=2;//选择当前显示方式为逐屏显示 init3();//逐屏显示初始化 for(iii=0;iii<=7*32;iii=iii+32)//判断逐屏显示的字符个数 for(jjj=0;jjj<=v*10;jjj++)//逐屏显示字符的速度由变量v控制 { for(kkk=0;kkk<=15;kkk++) //显示一幕 disp3();//若没有中断调用闪烁显示子程序 num3=0; temp3=0; //显示完一幕准备下一幕的显示 } }voidinit() //主程序初始化{ EA=1; //CPU开放所有中断源的中断请求 EX0=1; //允许外部中断0中断 EX1=1; //允许外部中断1中断 IT0=1; //外部中断0采用边沿触发方式产生中断 IT1=1; //外部中断1采用边沿触发方式产生中断 v=15; //设置移动速度的初值}voidinit1() //左移显示方式各变量的初始化{ shuz=5; shub=1; a=shuz*16+shub*8+16; P0=0; P2=0; temp1=0;}voiddisp1() //左移显示子程序{ P0=table[k]; k++; P2=table[k]; k++; P1=temp1; temp1++; if(temp1==0x10) temp1=0x00; delay(1); }voidinit2() //上移