項(xiàng)目3任務(wù)2技能點(diǎn)：編程實(shí)現(xiàn)多位共陰極數(shù)碼管動(dòng)態(tài)顯示講解

單片機(jī)原理及應(yīng)用技術(shù)項(xiàng)目三數(shù)碼管顯示的溫度計(jì)設(shè)計(jì)任務(wù)2多位LED數(shù)碼管顯示設(shè)計(jì)學(xué)校名稱：平頂山工業(yè)職業(yè)技術(shù)學(xué)院主講人：高同輝技能點(diǎn)編程實(shí)現(xiàn)多位共陰極數(shù)碼管動(dòng)態(tài)顯示任務(wù)實(shí)施四授課內(nèi)容1.硬件電路接線2.軟件程序編寫3.編譯、下載、驗(yàn)證4.結(jié)果分析評價(jià)與反饋五四、任務(wù)實(shí)施

1.硬件電路接線

數(shù)碼管的A,B,C,D,E,F,G,DP引腳分別接入開發(fā)板的數(shù)字管腳2，3，4，5，6，7，8，9。數(shù)碼管公共端1，2，3，4引腳通過串聯(lián)220Ω限流電阻依次接數(shù)字管腳10,

11,

12,

13。四、任務(wù)實(shí)施

2.軟件程序編寫#defineSEG_A2#defineSEG_B3#defineSEG_C4#defineSEG_D5#defineSEG_E6#defineSEG_F7#defineSEG_G8#defineSEG_H9#defineCOM110#defineCOM211#defineCOM312#defineCOM413unsignedchartable[10][8]={{0,0,1,1,1,1,1,1},//0{0,0,0,0,0,1,1,0},//1{0,1,0,1,1,0,1,1},//2{0,1,0,0,1,1,1,1},//3{0,1,1,0,0,1,1,0},//4{0,1,1,0,1,1,0,1},//5{0,1,1,1,1,1,0,1},//6{0,0,0,0,0,1,1,1},//7{0,1,1,1,1,1,1,1},//8{0,1,1,0,1,1,1,1}//9};voidsetup(){for(inti=2;i<14;i++){pinMode(i,OUTPUT);}}四、任務(wù)實(shí)施

2.軟件程序編寫case4:digitalWrite(COM1,HIGH);digitalWrite(COM2,HIGH);digitalWrite(COM3,HIGH);digitalWrite(COM4,LOW);//選擇位4break;default:break;}//a查詢碼值表digitalWrite(SEG_A,table[num][7]);digitalWrite(SEG_B,table[num][6]);digitalWrite(SEG_C,table[num][5]);digitalWrite(SEG_D,table[num][4]);digitalWrite(SEG_E,table[num][3]);digitalWrite(SEG_F,table[num][2]);digitalWrite(SEG_G,table[num][1]);digitalWrite(SEG_H,table[num][0]);}voidloop(){

Display(1,1);//第1位顯示1delay(500);Display(2,2);//第2位顯示2delay(500);Display(3,3);//第3位顯示3delay(500);Display(4,4);//第4位顯示4delay(500);}switch(com)//選通位選{case1:digitalWrite(COM1,LOW);//選擇位1digitalWrite(COM2,HIGH);digitalWrite(COM3,HIGH);digitalWrite(COM4,HIGH);break;case2:digitalWrite(COM1,HIGH);digitalWrite(COM2,LOW);//選擇位2digitalWrite(COM3,HIGH);digitalWrite(COM4,HIGH);break;case3:digitalWrite(COM1,HIGH);digitalWrite(COM2,HIGH);digitalWrite(COM3,LOW);//選擇位3digitalWrite(COM4,HIGH);break;voidDisplay(unsignedcharcom,unsignedcharnum){for(intj=2;j<10;j++){digitalWrite(j,LOW);}四、任務(wù)實(shí)施3.編譯、下載、驗(yàn)證觀察現(xiàn)象：數(shù)碼管從0開始累加顯示數(shù)據(jù)。

程序中根據(jù)實(shí)驗(yàn)原理圖，通過數(shù)碼管庫函數(shù)進(jìn)行數(shù)碼管初始化，不斷對numToShow變量進(jìn)行累加，然后對數(shù)碼管進(jìn)行設(shè)置數(shù)據(jù)、刷新顯示的操作。程序中沒有使用delay()函數(shù)進(jìn)行延時(shí)，而是通過不斷累加delaycount變量，在其達(dá)到理想閾值時(shí)對numToShow變量進(jìn)行累加。因?yàn)閿?shù)碼管需要不斷重復(fù)刷新數(shù)據(jù)才能保持顯示，若使用delay()進(jìn)行延時(shí)，則程序?qū)⑼Ｖ惯M(jìn)行等待，這段時(shí)間數(shù)碼管得不到刷新，顯示就會受到影響，數(shù)碼管會變暗、閃爍甚至熄滅。更加理想的做法是通過定時(shí)器來對數(shù)碼管進(jìn)行刷新。4.結(jié)果分析五、評價(jià)與反饋多位數(shù)碼管顯示編程思路：打開