两片74HC595级联驱动8个数码管.doc

两片74HC595级联动态驱动8位数码管51单片机#include sbit SCK = P11; / 数据输入时钟线，脉冲sbit SI = P10; / 数据线sbit RCK = P12; / 锁存unsigned char code SMG10 = 0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90; / 段码unsigned char code Wei8 = 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80; / 位选unsigned char Val8 = 0; / 要显示的数据* 函数声明 *void interrupt_init(void);void timer_init(void);控制74HC595输出数据void Output(void) RCK = 0; RCK = 1;向74HC595中写入一字节数据void Write_Byte(unsigned char dat) unsigned char i = 0; for(i=0; i8; i+) SCK = 0; SI = dat & 0x80; SCK = 1; dat = 1; 显示函数void Display(unsigned char * p) unsigned char * pt = Wei; Write_Byte(*(pt+0); Write_Byte(SMG*(p+7); Output(); Write_Byte(*(pt+1); Write_Byte(SMG*(p+6); 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); Output(); Write_Byte(*(pt+6); Write_Byte(SMG*(p+1); Output(); Write_Byte(*(pt+7); Write_Byte(SMG*(p+0); Output();int main(void) timer_init(); interrupt_init(); while(1) Display(Val); return 0;void interrupt_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void timer_init(void)TMOD = TMOD | 0x01;/定时器0工作方式1TMOD = TMOD & 0xFD;TH0 = 0x4B;/装初值，50ms计数TL0 = 0xFF;TR0 = 1;/开启定时器0void timer0() interrupt 1 static unsigned char counter0 = 0;counter0+;TH0 = 0x4B;/重新装入初值，定时器0从头开始计数，计数50msTL0 = 0xFF;if(2 = counter0)/2*50 ms = 100ms = 0.1scounter0 = 0;/counter0置零，定时器0从头开始计数 Val0+; if(10=Val0) Val0 = 0; Val1+; if(10=Val1) Val1 = 0; Val2+; if(10=Val2) Val2 = 0; Val3+; if(10=Val3) Val3 = 0; Val4+; if(10=Val4) Val4 = 0; Va