第一步喝口汤
个人理解：首先，这个LED点阵屏类似于数码的段选操作，这个LED点阵屏第一步就是利用595芯片来扩充IO，单片595就是能够把一个字节数据通过串行输入（一个IO输入），并行输出（8个IO输出），将我们想要的断码（2位16进制）一次性输入到点阵LED的高电平输入端，简单的说就是595通过把我们需要的列/行置为1，然后再通过我们单片机P0口，给出相对应的低电平，就会把某行中的某列点亮，更简单的说就是，就是利用行列式的下标来锁定对应的LED，只不过595需要一次性给出一行或一列的高电平（我们可以取反看需求硬件电路），给出高电平之后，只要检测到对应的行或列出现低电平，就会将该行列定位的坐标的LED点亮，可以说是控制变量法思想
静态显示（一个笑脸）
需要点亮有一的地方
main.c
#include <REGX52.H>
#include "Delay.h"sbit SER = P3^4; //不能使用P3_4
sbit RCK = P3^5;
sbit SCK = P3^6;void _74HC595_WriteByte(unsigned char Byte)
{unsigned char i ;SCK = 0; //移位寄存器的起始信号RCK = 0; //数据从移位寄存器转存到存储寄存器的起始信号for(i=0; i<8; i++){SER = Byte&(0X80>>i); //数据放到移位寄存器SER，每来一个上升沿SCK=1，就会把数据移送到移位寄存器中SCK = 1;SCK = 0;}//把数据送到QA-QH，RCK高电平移送RCK = 1; RCK = 0;}void MatrixLED_ShowColumn(unsigned char Column,Date)
{_74HC595_WriteByte(Date);P0 = ~(0X80>>Column); //P0低电平点亮Delay1ms(1);P0 = 0XFF;}void main(void)
{while(1){ MatrixLED_ShowColumn(0,0X3C); //显示对应的灯MatrixLED_ShowColumn(1,0X42);MatrixLED_ShowColumn(2,0XA9);MatrixLED_ShowColumn(3,0X85);MatrixLED_ShowColumn(4,0X85);MatrixLED_ShowColumn(5,0XA9);MatrixLED_ShowColumn(6,0X42);MatrixLED_ShowColumn(7,0X3C);}
}
动态显示（Whappy）
main.c
#include <REGX52.H>
#include "Delay.h"
#include "MatrixLED.h"unsigned char Animation[] = {0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0xFC,0x02,0x01,0x02,0x04,0x02,0x01,0x02,0xFC,0x00,0xFF,0x10,0x1F,0x00,0x3F,0x48,0x3F,0x00,0x3F,0x48,0x3F,0x81,0x42,0x24,0x18,0x10,0x20,0x40,0x80,0x00,0x00,0x00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,
};void main(void)
{unsigned char i,Offset=0,Count=0;while(1){ for(i=0; i<8; i++){MatrixLED_ShowColumn(i,Animation[i + Offset]);}Count++;if(Count>10){Count = 0;Offset++;if(Offset++>40)Offset = 0;}}
}
MatrixLED.c //矩阵显示
#include <REGX52.H>
#include "Delay.h"sbit SER = P3^4; //不能使用P3_4
sbit RCK = P3^5;
sbit SCK = P3^6;void _74HC595_WriteByte(unsigned char Byte)
{unsigned char i ;//初始化SCK = 0; //移位寄存器的起始信号RCK = 0; //数据从移位寄存器转存到存储寄存器的起始信号//输入串行数据for(i=0; i<8; i++){SER = Byte&(0X80>>i); //数据放到移位寄存器SER，每来一个上升沿SCK=1，就会把数据移送到移位寄存器中SCK = 1;SCK = 0;}//把数据送到QA-QH，RCK高电平移送RCK = 1; RCK = 0;}void MatrixLED_ShowColumn(unsigned char Column,Date)
{_74HC595_WriteByte(Date);P0 = ~(0X80>>Column);Delay1ms(1);P0 = 0XFF;}
MatrixLED.h
#ifndef __MatrixLED_H__
#define __MatrixLED_H__void _74HC595_WriteByte(unsigned char Byte); //595写断码
void MatrixLED_ShowColumn(unsigned char Column,Date); //位选#endif
笑脸
#include <REGX52.H>
#include "Delay.h"
#include "MatrixLED.h"unsigned char Animation[] = {0x3C,0x42,0xA9,0x85,0x85,0xA9,0x42,0x3C,0x3C,0x42,0xA1,0x85,0x85,0xA1,0x42,0x3C,0x3C,0x42,0xA5,0x89,0x89,0xA5,0x42,0x3C,0x3C,0x42,0xB5,0x89,0x89,0xB5,0x42,0x3C,0x3C,0x42,0xB1,0x85,0x85,0xB1,0x42,0x3C,0x3C,0x42,0xA1,0x85,0x85,0xA1,0x42,0x3C,};void main(void)
{unsigned char i,Offset=0,Count=0;while(1){ for(i=0; i<8; i++){MatrixLED_ShowColumn(i,Animation[i + Offset]);}Count++;if(Count>10){Count = 0;Offset+=7;if(Offset++>48)Offset = 0;}}
}
