51单片机——8X8点阵显示

最新推荐文章于 2022-12-02 23:33:44 发布

EverestRs

最新推荐文章于 2022-12-02 23:33:44 发布

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分类专栏：单片机文章标签：单片机点阵

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本文介绍了一种使用74HC595移位寄存器控制8x8 LED矩阵的方法，通过串行数据输入、存储寄存器时钟和移位寄存器时钟的控制，实现了LED矩阵的动态显示。文章详细描述了如何初始化定时器0，并在中断服务函数中进行列扫描和行扫描数据的更新，以实现循环显示效果。

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74hc595.h：

#ifndef __74hc595_H__
#define __74hc595_H__
/************************************位定义************************************/
sbit DATA_IN = P1^0;	        //串行数据输入
sbit ST_CK = P1^1;	        //存储寄存器时钟输入
sbit SH_CK = P1^2;	        //移位寄存器时钟输入
/***********************************函数声明***********************************/
void Ser_IN(unsigned char Data);	//串行数据输入
void Par_OUT(void);					//串行数据输出

void Ser_IN(unsigned char Data)
{
	unsigned char i;
	for(i = 0; i < 8; i++)
	{
		SH_CK = 0;			//CLOCK_MAX=100MHz
		DATA_IN = Data & 0x80;
		Data <<= 1;
		SH_CK = 1;
	}
}

void Par_OUT(void)
{
	ST_CK = 0;
	ST_CK = 1;
}

#endif

8x8LED.c

#include <reg52.h>
#include "74hc595.h"

unsigned char  i;
unsigned int  m,n;

#define  num  sizeof(Digit_Tab)	//代码长度
unsigned char code table[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
unsigned char code Digit_Tab[]= {//取模方式 阴码 列扫描 逆向
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x06,0x18,0x60,0x1D,0x60,0x18,0x06,0x00,
0x06,0x18,0x60,0x1C,0x60,0x18,0x06,0x00,
0x0B,0x1F,0x60,0x1C,0x60,0x18,0x06,0x00,
0x00,0x00,0x00,0x40,0x00,0x00,0x00,0x00,
0x00,0x04,0x04,0x7E,0x4E,0x24,0x00,0x00,
0x00,0x44,0x28,0x10,0x28,0x44,0x00,0x00,
0x7C,0x02,0x02,0x7C,0x02,0x02,0x7C,0x00,
0x00,0x3C,0x42,0x42,0x42,0x24,0x00,0x00,
0x00,0x3E,0x40,0x40,0x40,0x3E,0x00,0x00,
0x00,0x00,0x00,0x40,0x00,0x00,0x00,0x00,
0x0A,0x3C,0x42,0x4C,0x42,0x24,0x00,0x00,
0x00,0x3C,0x42,0x42,0x42,0x3C,0x00,0x00,
0x7C,0x02,0x02,0x7C,0x02,0x02,0x7C,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x88,0x49,0x2A,0x1F,0xB9,0x49,0x8E,0x00,
0x0A,0xFF,0x1A,0x22,0x2B,0xFE,0x2B,0x22,
0x00,0x3E,0x2E,0x2A,0x7F,0xAA,0xAA,0xBF,
0x00,0x08,0x09,0x89,0x8D,0x7B,0x09,0x08,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
};

void Display(void)
{		
    Ser_IN((table[i]));       //列扫描数据
    Ser_IN(Digit_Tab[i + n]); //查表取出行扫描数据
	Par_OUT();			      //输出显示
	i++; 
    if(i == 8)
    {
        i = 0;
    } 
    			     	      //循环扫描
	m++; 
    if(m == 300) 
    {
        m = 0;
        n++;
    }		                  //滚动速度控制
	if(n == num - 7)
    {
        n = 0;		          //循环显示
    }
}

void Timer0_init(void)
{
    TMOD = 0xf8;
    TH0  = 0xcc;		
    TL0  = 0x00;
    IE   = 0x82;
    TR0  = 1;
}

void Timer0_intservice(void) interrupt 1 using 0
{
    TH0 = 0xf8;
    TL0 = 0xcc;
	Display();
}


void main (void)
{
	Timer0_init();
	while(1);		
}