单片机20道复习题参考答案doc.docx

1、单片机20道复习题参考答案doc1.用P0 口驱动LED灯，要求循环左移，从右向左每次两个LED灯亮，程序重复执行。【一个排线。排1（PO-LED）#include DelaylOms(SO);(include LED = LED 2;unsigned char a, b;void DelaylOms(unsigned int c);if (P0 = OxCO)for (;cO;c-)main()LED = 0x03;for (b=38;b0;b-)unsigned char LED;(LED = 0x03;)for (a=130;a0;a);while (1)P0 = LED;void De

2、laylOm$(unsigned int c)2.用P0 口驱动LED灯做左右跑马灯程序，先向左侧跑马，每次左移2位，初始 时是2位LED灯亮，以后每次2个灯亮。待4次过后，再向右侧跑马，每次 右移1位，初始时是1位LED灯亮，以后每次1个灯亮，执行8次。程序重复执行。【一个排线。排 1 (PO-LED)】存include LED = LED 2;P0 = LED;(ftinclude unsigned char a, b;void DelaylOms(unsigned int c); 延时Delayl0ms(50);for (;c0;c)10msLED = 0x80;P0 = LED;(ma

3、in。for(i=0;i0;b-)(Delayl0ms(50);(unsigned char LED;LED = LED l;P0 = LED; for (a=130;a0;a);unsigned char i;/Oxfe = llll 1110LED = 0x03;Delayl0ms(50);while (1)/LED = OxO3;PO = LED;P0= LED;for(i=0;i0;a-);DelaylOms(l);GPIO_LED = ledValue;if (K3=0)void DelaylOms(unsigned int c)unsigned char a, b;keyValue

4、 = 3;4.单个静态数码管流动显示HELLO-LACo【一个排线。排1(PO-JP3(右上角)】unsigned char a, b;for (;c0;c)(for (b=38;b0;b-)(for (a=130;a0;a-);#lncludeWdefine GPIO_DIG POvoid DelaylOms(unsigned int c);unsigned char codeDIG_CODE10)=0x76,0x79,0x38,0x38,0x3f,0x40,0x38,0x77,0x39;void main(void)(unsigned char i = 0;while(l)GPIO_DIG

5、 = DIG_CODEi;i+；if(i = 10)i = 0;Delayl0ms(50);void Delayl0m$(unsigned int c)5.8位动态数码管显示BAD-FOODo【两个排线。排1 (P0-LED)排2(P1-J16)ttinclude#define GPIO_DIG P0define GPIO.PLACE Plunsigned char code DIG_PLACE8 = 0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f;unsigned char code DIG_CODE80x7c,0x77,0x5e,0x40,0x7L0x3f,

6、0x3f,0x5e;unsigned char Display Data (8);void DigDisplayO;void main(void)(unsigned char i;for(i=0; i8; i+)(DisplayData(i) = DIG_CODE(i;while(l)(DigDisplayO;void DigDisplay()unsigned chari;unsigned int j;for(i=0; i8; i+)(GPIO_PLACE = DIG_PLACEiGPIO_DIG = DisplayDatai;j = 10;whlle(j-);GPIO_DIG = 0x00;

7、6.矩阵键盘，按键移位，按键8次，显示“8765ABCD”。void DigDisplayO(unsigned char i;unsigned int j;for(i=0;i8;i+)(switch(i)case(O):LSA=O;LSB=O;LSC=O; break;case(l):LSA=l;LSB=O;LSC=O; break;case(2):LSA=0;LSB=l;LSC=0; break;case(3):LSA=l;LSB=l;LSC=0; break;case(4):LSA=0;LSB=0;LSC=l; break;case(5):LSA=l;LSB=0;LSC=l; break;

8、case(6):LSA=0;LSB=l;LSC=l; break;case(7):LSA=l;LSB=l;LSC=l; break;GPIO_DIG=DisplayDatai;j=10;while(j-);GPIO_DIG=OxOO;void KeyDown(void)(unsigned int a=0;GPIO_KEY=OxOf;if(GPIO_KEY!=OxOf)(DelaylOms(l);a=0;if(GPIO_KEY!=OxOf)KeyState=l;GPIO_KEY=OXOF;#includedefine GPIO_DIG POWdefineGPIO_KEYPlsbit LSA=P2

9、A2;sbit LSB=P2A3;Sbit LSC=P2A4;unsigned char code DIG_CODE17=(0x5e,0x39,0x7c,0x00,0x77,0x6d,0x7d,0x00,0x07,0x7f；unsigned char Key Value;unsigned char KeyState;unsigned char DlsplayData8;void DelaylOms(unsigned int c);void KeyDownf);void DigDisplay();void main(void)KeyState=O;while(l)KeyDown();if(Key

10、State=l)(DisplayData7=DisplayData6);Di$playData(6)=Di$playData(5);DisplayData5=DisplayData(4);DisplayData4=DisplayData3;DisplayData3=DisplayData2;DisplayData2=DisplayDatal);DisplayDatal=DisplayData(O);DisplayDataOj=DIG_CODEKeyValue;KeyState=O;)DigDisplay();switch(GPIO_KEY)case(0X07):Key Va I u e=0;

11、b rea k;case(0X0b):KevValue=4;break;case(OXOd)： KeyValue=8;break;ca$e(0X0e):KeyValue=12;break;GPIO_KEY=OXFO;switch(GPIO_KEY)(ca$e(0X70):KeyValue=KeyValue+3;break;case(OXbO):KeyValue=KeyValue+2;break;case(OXdO): KeyValue=KeyValue+l；break;case(OXeO): break;while(aO;c)for (b=38;b0;b)(for (a二 130;a0;a)；

12、)7. RS232串口发送试验，通过串口发送“好好学习天天向上”到 电脑，上位机用串口调试助手一直接收“好好学习天天向上” OTH1=OXF3;unsigned char a, b;8.用TO定时器（P3.4端子）做计数器中断实验，计数器端（P3.4）来的脉冲取自端子Pl.7。P1.7端子产生方波信号。P0.0SHUCHUPulse = 0;case 2:LS138A=0; LS138B=1; LS138C=0; break;case 3:LS138A=1; LS138B=1; LS138C=0; break;case 4:LS138A=0; LS138B=0; LS138C=1; break

13、;case 5:IS138A=1; LS138B=0; LS138C=1; break;case 6:LS138A=0; LS138B= 1; LS138C=1; break;case 7:LS138A=1; LS138B=1; LS138C=1; break;delay(150);void main(void)(PO=Oxff;Pl=Oxff;P2=0xff;IT0=l;EA=1;EXO=1;while(l)(display。；void counter(void) interrupt 0(EXO=O;LedNumVal+；9.4位数码管上显示外部中断计数，用单片机通过译码器控制数 码管和外部

14、中断使用，P0 口接显示，中断来自于独立按键控制, 每当按下一次按键，中断里的某个作为计数的变量加lo P3.2- 按键。P2.2、3、4-ABCo PO-LEDinclude include sbit LS138A=P2A2;sbit LS138B=P2A3;sbit LS138C=P2A4;unsigned int LedNumVal = 0 ,LedOut8;unsigned char code Disp_Tab = 0xC0,0xF9广0xA4广OxBO广0x99广0x92广0x82广0xF8广0x80尸0x90,0x88广0x83,0xC6广OxAl广0x86广0xbf,0xc7广0

15、x8c广Oxcl, Oxff, 0xf7void delay(unsigned int i)(charj;for(i; i 0; i)for(j = 200; j 0; j)；display unsigned char i;LedOut(0)=Disp_Tab(LedNumVal%10000/1000;LedOutl)sDisp_Tab(LedNumVal%1000/100&0x7f;LedOut2=Disp_TabLedNumVal%100/10;LedOut3=Disp_TabLedNumVal%10;for( i=0; i8; i+) P0 = LedOutfi);switch(i)ca

16、se 0:LS138A=0; LS138B=0; LS138C=0; break;case1:LS138A=1; LS138B=0; LS138C=0; break;EXO=1;void UsartConfiguration()SCON=0X50;TMOD=0X20;PCON 二 0X80;TH1=OXF3;TL1=OXF3；TR1=1;void DigDisplayO(unsigned char i;unsigned int j;for(i=0;l8;iw)switch(i)case(O)：LSA=O;LSB=O;LSC=O; break;case(l):LSA=1;LSB=O;LSC=O;

17、 break;case(2):LSA=O;LSB=1;LSC=O; break;case ：LSA=1;LSB=1;LSC=O; break;case(4):LSA=O;LSB=O;LSC=1; break;case(5):LSA=1;LSB=O;LSC=1; break;case(6):LSA=O;LSB=1;LSC=1; break;case(7):10.单片机将串口接收到的数据以10进制显示在数码管上。（用单片机通过译码器控制数码管的位选端子。）【P2.2、3、4.译码器的 A、B、Co PO-LED#include#define GPIO_DIG P0sbit LSA=P2A2;sbi

18、t LSB=P2A3;sbit LSC=P2A4;unsigned char code DIG_CODE17=(0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71;unsigned char DlsplayData8;void DigDisplayO;void UsartConfiguration();void main()(unsigned char receiveData;UsartConfiguration();while(l)(if(RI = 1)(receiveData = S

19、BUF;RI = 0;DisplayDatafO = 0x00；DisplayDatafl = DIG.CODE(receiveData /100;DisplayData2 = DIG_CODEreceiveData % 100/ 10;DisplayData3 = DIG_CODEreceiveData % 10;DisplayData =0x00;DisplayData(5) = DIG_CODE(receiveData /100);DisplayData =DIG_CODE (receiveData % 100/10;DisplayData7 = DIG_CODEreceiveData

20、% 10;)DigDisplay();LSA=1;LSB=1;LSC=1; break;GPIO_DIG=DisplayDatai;j=10；while(j-);GPIO_DIG 二 0x00;)11.用单片机采集8个开关的状态，然后将采集到的结果通过发光二极管显示。当某一 开关闭合时，采集到的数据为“0”，与其对应的发光二极管亮，当某一开关断开时 采集到的数据为“1”，与其对应的发光二极管不亮。include case(OxBF):include define GPIO.KEY Pl#define GPIO_LED P0void DelaylOms(unsigned int c);unsig

21、ned char Key_Scan();void main(void)(unsigned char ledValue, keyNum;ledValue = 0x01;while (1)(keyNum = Key_Scan();switch (keyNum)(case(OxFE):ledValue = 0x01;break;case(OxFD):ledValue = 0x02;break;case(OxFB):ledValue = 0x04;break;case(0xF7):ledValue = 0x08;break;case(OxEF):ledValue = 0x10;break;case(O

22、xDF):ledValue = 0x20;break;ledValue = 0x40;break;case(0x7F):ledValue = 0x80;break;default:break;GPIO_LED = ledValue;)unsigned char Key_Scan()unsigned char key Value = 0 J;if(GPIO_KEY != OxFF)(DelaylOms(l);if(GPIO_KEY != OxFF)(keyValue = GPIO.KEY;i = 0;while (i0;a-)；unsigned char az b;for (;cO;c-)(fo

23、r (b=38;b0;b-)12.用单片机控制八个发光二极管进行花样显示，显示规律为：（1）八个LED依次左移 点亮,（2）八个LED依次右移点亮，然后再从进行循环。【一个排线。排l（PO-LED） #include PO = LED;Delayl0ms(50);LED = LED 1;LED = LED | 0x80;void DelaylOms(unsigned int c);unsigned char LED;void main()(unsigned char i;“首先赋值LED-/LED = 0x01;for (d=2;d0;d-)(13.制作一个09的数秒器，并将计数值在数码上显示

24、出来。【P0JP3】#includedefine GPIO_DIG P0void Delayl0ms();unsigned char code DIG_CODE10=0x3Fr 0x06z 0x5B, 0x4F, 0x66, 0x6D, 0x7D,0x07,0x7F, Ox6F;void main(void)(unsigned char i = 0;while(l)GPIO_DIG = DIG_CODEi;for (c=200;c0;c-)for (b=10;b0;b-)for (a=124;a0;a-);14.设计一个4*4的行列式键盘，当按下某一个按键时，在LED数码管上显示该按键的键号。

25、【P0-JP3。Pl独立按键。74HC165短接帽断case(OXOb): KeyValue=4;break;15.设计一个流水花样灯。花样灯由八个发光二极管构成，正常情况下 花样灯正反向循环流水点亮，控制按钮SW按下时，花样灯中的发 光二极管交替点亮，当SW断开后花样灯恢复至正常状态。按键通过外部中断实现。【PO-LED。P3.2独立按键】for (b=38;b0;b-)#includevoid UsartConfiguration();void main()UsartConfiguration();while(l)()void U$artConfiguration()SCON=0X50;T

26、MOD=0X20;PCON=0X80;TH1=OXF3;#include#define uchar unsigned char#define uint unsigned intsbit ledl=PlA0;uchar num;void main()TMOD=0x01;TH0=(655364S872)56;TLO 二(6553645872)%256;EA=1;ETO=1;TRO=1;while(l)17.由串口调试助手发送“考生姓名和学号”给单片机，单片机接收到后返回给串口调试助手。TL1=OXF3;ES=1;EA=1;TR1=1;void Usart() interrupt 4(unsigned char receiveData;receiveData=SBUF;RI = O;SBUF=receiveData;whil