两片74HC595级联驱动8个数码管.doc

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1、两片74HC595级联动态驱动8位数码管 51单片机#includesbitSCK=P1^1;   //数据输入时钟线，脉冲sbitSI =P1^0;   //数据线sbitRCK=P1^2;   //锁存unsignedcharcodeSMG[10]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90}; //段码unsignedcharcodeWei[8]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};   //位选

2、unsignedcharVal[8] ={0};   //要显示的数据 ************************函数声明************************voidinterrupt_init(void);voidtimer_init(void);  控制74HC595输出数据voidOutput(void){   RCK=0;   RCK=1;} 向74HC595中写入一字节数据voidWrite_Byte(unsignedchardat){   unsignedchari=0;      for(i=

3、0;i<8;i++)   {       SCK=0;       SI =dat&0x80;       SCK=1;              dat<<=1;         }} 显示函数voidDisplay(unsignedchar*p){   unsignedchar*pt=Wei;      Write_Byte(*(pt+0));   Write_Byte(SMG[*(p+7)]);   Output();      Write_Byte(*(pt+1));   Write_Byte(SMG[*(p+6)]

4、);   Output();      Write_Byte(*(pt+2));   Write_Byte(SMG[*(p+5)]);   Output();      Write_Byte(*(pt+3));   Write_Byte(SMG[*(p+4)]);   Output();       Write_Byte(*(pt+4));   Write_Byte(SMG[*(p+3)]);   Output();      Write_Byte(*(pt+5));   Write_Byte(SMG[*(p+2)]);  

5、 Output();      Write_Byte(*(pt+6));   Write_Byte(SMG[*(p+1)]);   Output();      Write_Byte(*(pt+7));   Write_Byte(SMG[*(p+0)]);   Output();   } intmain(void){      timer_init();   interrupt_init();      while(1)   {       Display(Val);   }      return0;}voidinterr

6、upt_init(void){ EA =1;  //开总中断 ET0=1;  //开定时器0中断 ET1=1;  //开定时器1中断}voidtimer_init(void){ TMOD=TMOD

7、0x01;  //定时器0工作方式1 TMOD=TMOD&0xFD;    TH0 =0x4B;   //装初值，50ms计数 TL0 =0xFF; TR0 =1;    //开启定时器0}voidtimer0()interrupt1{   staticunsignedcharcounter0=0; counter0++; TH0

8、 =0x4B;   //重新装入初值，定时器0从头开始计数，计数50ms   TL0 =0xFF;  if(2==counter0)  //2*50ms=100ms=0.1s {  counter0=0;  //counter0置零，定时器0从头开始计数              Val[0]++;       if(10==Val[0])       {           Val[0]=0;           Val[1]++;                      if(10==Val[1])          

9、 {               Val[1]=0;               Val[2]++;                              if(10==Val[2])               {                   Val[2]=0;