七、LED点阵屏

接口介绍

LED点阵屏需要进行逐行或逐列扫描，才能使LED同时显示

74HC595

是串行输入并行输出的移位寄存器，用3跟线输入串行数据，8根线输出并行数据。每到达一个SERCLK，那么数据就会向下移动，到达RCLK后，所有数据被平移到输出端。QH是级联用的

点阵屏显示图形

#include 
#include "Delay.h"

sbit RCK=P3^5;		//RCLK
sbit SCK=P3^6;		//SRCLK
sbit SER=P3^4;		//SER

#define MATRIX_LED_PORT		P0
void _74HC595_WriteByte(unsigned char Byte)
{
	unsigned char i;
	for(i=0;i<8;i++)
	{
		SER=Byte&(0x80>>i);
		SCK=1;
		SCK=0;
	}
	RCK=1;
	RCK=0;
}
void MatrixLED_ShowColumn(unsigned char Column,Data)
{
	_74HC595_WriteByte(Data);// 选中了某一行
	MATRIX_LED_PORT=~(0x80>>Column);// 让一行的某一列亮，0x80表示列的第一个灯亮
	Delay(1);
	MATRIX_LED_PORT=0xFF;
}

void main()
{
	SCK=0;
	RCK=0;
	while(1)
	{
		MatrixLED_ShowColumn(0,0x3C);
		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);
	}
}

点阵屏显示动画

#include 
#include "Delay.h"
#include "MatrixLED.h"

//动画数据
unsigned char code 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,
};

void main()
{
	unsigned char i,Offset=0,Count=0;
	MatrixLED_Init();
	while(1)
	{
		for(i=0;i<8;i++)	//循环8次，显示8列数据
		{
			MatrixLED_ShowColumn(i,Animation[i+Offset]);
		}
		Count++;			//计次延时
		if(Count>15)
		{
			Count=0;
			Offset+=8;		//偏移+8，切换下一帧画面
			if(Offset>16)
			{
				Offset=0;
			}
		}
	}
}