74HC595控制8位数码管 51单片机

// 注意 此代码没有什么技术含量，也没有按规范些，旨在说明595怎么控制，大家不要模仿。

// 此代码刷新速度有点慢，注意想办法优化，time变量用定时器中断处理，主函数不断地刷新显示函数，这样就不会有闪屏，当然在STM32平台毫无压力

#include

sbit SCK = P3^2; // 数据输入时钟线，脉冲

sbit SI = P3^3; // 数据线

sbit RCK = P3^4; // 锁存

unsigned char code SMG[10] = {0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90};

unsigned char Wei[8] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};//位选

unsigned char Val[8] = {0};

void Output(void)

{

RCK = 0;

RCK = 1;

}

void Write_Byte(unsigned char dat)

{

unsigned char i = 0;

//每次发送一位数据，8次发送完毕，先发送高位（切记）

for(i=0; i<8; i++)

{

SCK = 0;

SI = dat & 0x80;

SCK = 1;

dat <<= 1;

}

}

void Display(unsigned char * p)

{

unsigned char * pt = Wei;

//注意，先发送位选，因为控制位选的595芯片在控制段选的595芯片下一级

Write_Byte(*(pt+0));//位选，

Write_Byte(SMG[*(p+0)]);//段选

Output();//发送到595 输出

Write_Byte(*(pt+1));

Write_Byte(SMG[*(p+1)]);

Output();

Write_Byte(*(pt+2));

Write_Byte(SMG[*(p+2)]);

Output();

Write_Byte(*(pt+3));

Write_Byte(SMG[*(p+3)]);

Output();

Write_Byte(*(pt+4));

Write_Byte(SMG[*(p+4)]);

Output();

Write_Byte(*(pt+5));

Write_Byte(SMG[*(p+5)]);

Output();

Write_Byte(*(pt+6));

Write_Byte(SMG[*(p+6)]);

Output();

Write_Byte(*(pt+7));

Write_Byte(SMG[*(p+7)]);

Output();

}

int main(void)

{

unsigned long int time = 0;

unsigned int t = 0;

while(1)

{

t++;

if(100==t)

{

t= 0;

time++;

Val[0] = time / 10000000 % 10;

Val[1] = time / 1000000 % 10;

Val[2] = time / 100000 % 10;

Val[3] = time / 10000 % 10;

Val[4] = time / 1000 % 10;

Val[5] = time / 100 % 10;

Val[6] = time / 10 % 10;

Val[7] = time % 10;

}

Display(Val);

}

return 0;

}