單片機(jī)控制8×8LED點(diǎn)陣屏顯示數(shù)字的設(shè)計(jì)

單片機(jī)控制8×8LED點(diǎn)陣屏顯示數(shù)字的設(shè)計(jì)設(shè)計(jì)要求：用單片機(jī)的P0口外接74LS245作為控制8×8LED點(diǎn)陣屏的行驅(qū)動(dòng)，列選通由P1端口控制，程序運(yùn)行時(shí)，8×8LED點(diǎn)陣屏依次循環(huán)顯示數(shù)字0～9。刷新時(shí)間由定時(shí)器T1的定時(shí)中斷來完成。方案論證：方案一：最小系統(tǒng)加74LS245驅(qū)動(dòng)芯片和成品8*8點(diǎn)陣進(jìn)行設(shè)計(jì)。優(yōu)點(diǎn)：外圍電路簡(jiǎn)單易焊，耗時(shí)少！缺點(diǎn)：成本較高。方案二：最少系統(tǒng)加三極管驅(qū)動(dòng)和手焊8*8點(diǎn)陣進(jìn)行設(shè)計(jì)。優(yōu)點(diǎn)：成本相對(duì)較低。缺點(diǎn)：點(diǎn)陣難焊，耗時(shí)長(zhǎng)。本次課設(shè)采用方案一，原因是耗時(shí)少，電路相對(duì)穩(wěn)定。理論設(shè)計(jì)：用CAD軟件繪制的硬件原理圖及工作原理的分析；軟件流程圖及帶注釋的程序清單。工作原理：P0口外芯片74LS245來驅(qū)動(dòng)行點(diǎn)亮，P1口外接點(diǎn)陣進(jìn)行列選通，以掃描方式依次顯示0-9.軟件流圖：開始↓定時(shí)器1初始化↓主循環(huán)←←↑←←↑↓無↑↑定時(shí)中斷函數(shù)→→有無中斷→→↑↑↓有↑↓↑調(diào)用顯示子函數(shù)↑↓→→→→→→完整程序：#include<reg52.h>#defineucharunsignedchar#defineuintunsignedintuinti,a,b=0,t;ucharcodedxuan0[]={0x00,0x18,0x24,0x24,0x24,0x24,0x24,0x18,}; //"0"ucharcodedxuan1[]={0x00,0x18,0x18,0x18,0x18,0x18,0x18,0x00,}; //"1"ucharcodedxuan2[]={0x00,0x3C,0x24,0x0C,0x18,0x30,0x3C,0x00,}; //"2"ucharcodedxuan3[]={0x00,0x3C,0x24,0x18,0x0C,0x24,0x38,0x00,}; //"3"ucharcodedxuan4[]={0x00,0x08,0x18,0x38,0x28,0x3C,0x08,0x00,}; //"4"ucharcodedxuan5[]={0x00,0x3C,0x20,0x3C,0x04,0x24,0x38,0x00,}; //"5"ucharcodedxuan6[]={0x00,0x18,0x24,0x20,0x38,0x24,0x24,0x18,}; //"6"ucharcodedxuan7[]={0x00,0x3C,0x04,0x08,0x08,0x10,0x10,0x10,}; //"7"ucharcodedxuan8[]={0x38,0x44,0x44,0x38,0x44,0x44,0x44,0x38,};//"8"ucharcodedxuan9[]={0x18,0x24,0x24,0x24,0x1C,0x04,0x24,0x18,}; //"9"ucharcodewxuan[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f,0xff,};//位選voiddelay(uintz) //延時(shí)函數(shù){ uintx,y; for(x=z;x>0;x--) for(y=256;y>0;y--);}//***********************顯示函數(shù)**************************//voiddisplay0(){for(a=50;a>0;a--)for(i=0;i<9;i++){P1=wxuan[i];P0=dxuan0[i];delay(1);} }voiddisplay1(){for(a=50;a>0;a--)for(i=0;i<9;i++){P1=wxuan[i];P0=dxuan1[i];delay(1);} }voiddisplay2(){for(a=50;a>0;a--)for(i=0;i<9;i++){P1=wxuan[i];P0=dxuan2[i];delay(1);} }voiddisplay3(){for(a=50;a>0;a--)for(i=0;i<9;i++){P1=wxuan[i];P0=dxuan3[i];delay(1);} }voiddisplay4(){for(a=50;a>0;a--)for(i=0;i<9;i++){P1=wxuan[i];P0=dxuan4[i];delay(1);} }voiddisplay5(){for(a=50;a>0;a--)for(i=0;i<9;i++){P1=wxuan[i];P0=dxuan5[i];delay(1);} }voiddisplay6(){for(a=50;a>0;a--)for(i=0;i<9;i++){P1=wxuan[i];P0=dxuan6[i];delay(1);} }voiddisplay7(){for(a=50;a>0;a--)for(i=0;i<9;i++){P1=wxuan[i];P0=dxuan7[i];delay(1);} }voiddisplay8(){for(a=50;a>0;a--)for(i=0;i<9;i++){P1=wxuan[i];P0=dxuan8[i];delay(1);} }voiddisplay9(){for(a=50;a>0;a--)for(i=0;i<9;i++){P1=wxuan[i];P0=dxuan9[i];delay(1);} }voidmain(void){ TMOD=0X10;//設(shè)置定時(shí)器1為工作方式1 TH1=(65536-50000)/256; TL1=(65536-50000)%256; //定時(shí)50000us EA=1;//開總中斷 ET1=1;//開定時(shí)器1中斷 TR1=1;//啟動(dòng)定時(shí)器1 while(1) { if(t==40) { t=0; switch(b) { case0:display0();break; case1:display1();break; case2:display2();break; case3:display3();break; case4:display4();break; case5:display5();break; case6:display6();break; case7:display7();break; case8:display8();break; case9:display9();break; } b++;if(b==10)b=0; } }}//*****************定時(shí)中斷函數(shù)****************//voidext1()interrupt3{ TH1=(65536-50000)/256; TL1=(65536-50000)%256; t++; }電路仿真及仿真結(jié)果分析：電路仿真結(jié)果正確，達(dá)到預(yù)期設(shè)計(jì)要求，能循環(huán)顯示0-9，刷新時(shí)間由定時(shí)器1設(shè)定。測(cè)試方案與測(cè)試結(jié)果：經(jīng)自焊硬件測(cè)試，結(jié)果與仿真效果一致，由于材料限制，點(diǎn)陣引腳與訂座子有時(shí)會(huì)接觸不良，導(dǎo)致某條LED不亮。作品功能和使用說明：接上5V電源即可循環(huán)顯示0-9.心得體會(huì)：設(shè)計(jì)過程中遇到程序設(shè)計(jì)問題，網(wǎng)上找到視頻教程學(xué)習(xí)中斷程序的編寫，以及查閱C語(yǔ)言課本得以解決。調(diào)試過程中發(fā)現(xiàn)點(diǎn)陣不亮，到處檢查電路有無短路和斷