前言

LED点阵屏通过LED(发光二极管）组成，以灯珠亮灭来显示文字、图片、动画、视频等，是各部分组件都模块化的显示期间，通常由显示模块、控制和电源组成。led点阵显示屏制作简单，安装方便，被广泛应用于各种公共场合，如汽车报站器、广告屏以及公告牌等。

一、74hc595

说到点阵就必须说起74hc595，一个8位串行输入并行输出的移位寄存器

二、使用步骤

1.点阵心形

#include <REG51.h>  //51专属头文件
#include <public.h>	//延时函数头文件
#include "intrins.h"
#define led P0		//数码管io

sbit STCP =P3^5;
sbit SHCP =P3^6;
sbit DS = P3^4;


unsigned int arr1[8]={0x30,0x78,0x7C,0x3E,0x3E,0x7C,0x78,0x30,};   //74hc595列控制
unsigned int arr2[8]={0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe,};   //P0行控制
                                       

int hc595(unsigned char dat)            //1字节8bit输入
{
 unsigned int i;
  for(i=0;i<8;i++)
   {
   	DS=dat>>7;
	dat=dat<<1;						//74hc595输出传输与存储
	SHCP=0x00;
	delay_10us(1);
	SHCP=0x01;
   }
   STCP=0x00;
   delay_10us(1);				   //存贮
   STCP=0x01;
}
int main()
{
   unsigned int i=0;
   while(1)
   {
   for(i=0;i<8;i++)
   {
   led=arr2[i];
   hc595(arr1[i]);		   //行列扫描
   delay_ms(1);
   hc595(0x00);   		   //消影
   }
   }
return 0;
}

流动心形

#include <REG51.h>  //51专属头文件
#include <public.h>	//延时函数头文件
#include "intrins.h"
#define led P0		//数码管io

sbit STCP =P3^5;
sbit SHCP =P3^6;
sbit DS = P3^4;


unsigned int arr1[8]={0x30,0x78,0x7C,0x3E,0x3E,0x7C,0x78,0x30,};   //74hc595列控制
//unsigned int arr2[8]={0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe,};   //P0行控制
                                       

int hc595(unsigned char dat)            //1字节8bit输入
{
 unsigned int i;
  for(i=0;i<8;i++)
   {
   	DS=dat>>7;
	dat=dat<<1;						//74hc595输出传输与存储
	SHCP=0x00;
	delay_10us(1);
	SHCP=0x01;
   }
   STCP=0x00;
   delay_10us(1);				   //存贮
   STCP=0x01;
}
int main()
{
   unsigned int i=0;
   unsigned int z=0;

   while(1)
   for(z=0;z<8;z++)
   {
   for(i=0;i<8;i++)
   {
   led=_cror_(0x7f,i+z);
   hc595(arr1[i]);		   //行列扫描
   delay_ms(1);
   hc595(0x00);   		   //消影
   }
    delay_ms(100);
   }
return 0;
}