項(xiàng)目4任務(wù)2技能點(diǎn)：編程實(shí)現(xiàn)點(diǎn)陣字符移動(dòng)顯示講解

單片機(jī)原理及應(yīng)用技術(shù)項(xiàng)目四點(diǎn)陣顯示的電流表設(shè)計(jì)學(xué)校名稱(chēng)：平頂山工業(yè)職業(yè)技術(shù)學(xué)院主講人：高同輝任務(wù)28×8點(diǎn)陣動(dòng)態(tài)顯示設(shè)計(jì)技能點(diǎn)編程實(shí)現(xiàn)點(diǎn)陣字符移動(dòng)顯示任務(wù)實(shí)施四授課內(nèi)容1.硬件電路接線(xiàn)2.軟件程序編寫(xiě)3.編譯、下載、驗(yàn)證4.結(jié)果分析評(píng)價(jià)與反饋五四、任務(wù)實(shí)施

1.硬件電路接線(xiàn)根據(jù)點(diǎn)陣屏管腳定義，點(diǎn)陣屏的引腳[9,14,8,12,1,7,2,5]分別連接Arduino開(kāi)發(fā)板的[2,3,4,5,6,7,8,9]口，8個(gè)引腳為L(zhǎng)ED的正極；點(diǎn)陣屏的引腳[13,3,4,10,6,11,15,16]分別連接Arduino開(kāi)發(fā)板的[10,11,12,13,14,15,16,17]，8個(gè)引腳為L(zhǎng)ED的負(fù)極。注意：UnoR3開(kāi)發(fā)板的A0~A5可以做普通GPIO使用，編號(hào)分別為14~19。四、任務(wù)實(shí)施

2.軟件程序編寫(xiě)intleds[8]={2,3,4,5,6,7,8,9};//點(diǎn)陣屏正極引腳intgnds[8]={10,11,12,13,14,15,16,17};//點(diǎn)陣屏負(fù)極引腳chartest[]={//字庫(kù)

0x00,0x7C,0x8A,0x92,0xA2,0x7C,0x00,0x00,//-0-0x00,0x00,0x42,0xFE,0x02,0x00,0x00,0x00,//-1-0x00,0x46,0x8A,0x92,0x92,0x62,0x00,0x00,//-2-0x00,0x84,0x82,0x92,0xB2,0xCC,0x00,0x00,//-3-0x00,0x18,0x28,0x48,0xFE,0x08,0x00,0x00,//-4-0x00,0xE4,0xA2,0xA2,0xA2,0x9C,0x00,0x00,//-5-0x00,0x3C,0x52,0x92,0x92,0x8C,0x00,0x00,//-6-0x00,0x80,0x8E,0x90,0xA0,0xC0,0x00,0x00,//-7-0x00,0x6C,0x92,0x92,0x92,0x6C,0x00,0x00,//-8-0x00,0x62,0x92,0x92,0x94,0x78,0x00,0x00,//-9-0x00,0x3E,0x48,0x88,0x48,0x3E,0x00,0x00,//-A-0x00,0xFE,0x92,0x92,0x92,0x6C,0x00,0x00,//-B-0x00,0x7C,0x82,0x82,0x82,0x44,0x00,0x00,//-C-0x00,0xFE,0x82,0x82,0x82,0x7C,0x00,0x00,//-D-0x00,0xFE,0x92,0x92,0x92,0x82,0x00,0x00,//-E-0x00,0xFE,0x90,0x90,0x90,0x80,0x00,0x00,//-F-};四、任務(wù)實(shí)施

2.軟件程序編寫(xiě)voidsetup(){for(inti=0;i<8;i++){pinMode(leds[i],OUTPUT);pinMode(gnds[i],OUTPUT);digitalWrite(gnds[i],HIGH);//負(fù)極引腳拉高，熄滅所有LED}}voidledclean(){for(inti=0;i<8;i++)//將點(diǎn)陣屏正極拉低，負(fù)極拉高，關(guān)斷顯示

{digitalWrite(leds[i],LOW);digitalWrite(gnds[i],HIGH);}}//字符顯示voidledShow(charnum,chardat{digitalWrite(gnds[num],LOW);for(inti=0;i<8;i++){digitalWrite(leds[i],dat&0x80);//10000000dat<<=1;}delayMicroseconds(100);digitalWrite(gnds[num],HIGH);ledclean();}四、任務(wù)實(shí)施

2.軟件程序編寫(xiě)voidloop(){for(inta=0;a<120;a++)//控制流動(dòng)顯示內(nèi)容

{for(inti=0;i<200;i++)//循環(huán)顯示達(dá)到延時(shí)效果

{for(intc=0;c<8;c++)//8列循環(huán)掃描，達(dá)到點(diǎn)陣屏驅(qū)動(dòng)效果

{ledShow(c,test[c+a]);}}}}四、任務(wù)實(shí)施3.編譯、下載、驗(yàn)證4.結(jié)果分析觀(guān)察現(xiàn)象：數(shù)字和字母依次從點(diǎn)陣右側(cè)到左側(cè)流動(dòng)顯示，如此往復(fù)顯示。從滾動(dòng)顯示效果看，

程序中關(guān)鍵是調(diào)用函數(shù)ledShow(c,test[c+a]);實(shí)現(xiàn)一個(gè)字符顯示依次移動(dòng)1列

。五、評(píng)價(jià)與反饋點(diǎn)陣顯示采用逐行掃描的方式：用一個(gè)I/O口輸出行碼決定哪一行能亮，用另一個(gè)I/O口輸出列數(shù)據(jù)，決定該行上哪個(gè)LED亮。能亮的行從上到下掃描完8行，即顯示出一個(gè)完整的圖像。

逐列掃描方式：此時(shí)用一個(gè)I/O