3. 51——LCD1602显示 字符、字符串、数字

LCD1602简介

LCD1602相关引脚

LCD1602写命令、写数据相关操作图

写指令 代码

void LCD_WriteCommand(unsigned char Command)
{
	LCD_RS = 0; //指令
	LCD_RW = 0; //写
	LCD_DataPort = Command; //数据存放
	LCD_E  = 1; //使能
	Delay1ms(); //最低要求延迟150纳秒 我们直接给1ms
	LCD_E  = 0; //失能
	Delay1ms();
}

写数据 代码

void LCD_WriteData(unsigned char Data)
{
	LCD_RS = 1; //数据
	LCD_RW = 0; //写
	LCD_DataPort = Data; //数据存放
	LCD_E  = 1; //使能
	Delay1ms(); //最低要求延迟150纳秒 我们直接给1ms
	LCD_E  = 0; //失能
	Delay1ms();
}

LCD1602显示程序步骤及如何初始化

1. 显示开关控制指令（功能：控制显示器开/关 光标显示/关闭 是否闪烁）
2. 进入模式设置指令（功能：每写入一位数据后光标的移动 左/右 显示屏不移动/整体右移 ）
3. 功能设定指令（功能：设定数据总线的位数 显示的行数 字型 ）
4. 清屏指令（功能：清屏显示空白 光标归位 地址计数器（AC）的值为0）
5. 显示位置设置（功能:指定在1602上哪个位置上显示数据）

显示开关控制指令

LCD_WriteCommand(0x0c); // 0000 1100 显示关，游标不显示，不闪烁

进入模式设置指令

LCD_WriteCommand(0x06) // 0000 0110 写入数据后光标自动右移 整屏不移动

功能设定指令

LCD_WriteCommand(0x38); //0011 1000 数据总线8位 16X2显示 5*7点阵

清屏指令

LCD_WriteCommand(0x01); //0000 0001 清屏 

设置从（x,y）开始显示

如果想在1602屏幕上第一行第一个开始显示 就是0x80
如果想在1602屏幕上第二行第一个开始显示 就是0xc0

void LCD_SetCursor(unsigned char Line,unsigned char Columu)
{
	if(Line == 1)
	{
		LCD_WriteCommand( 0x80 | (Columu-1) );
	}
	else
	{
		LCD_WriteCommand( 0x80 | ( Columu-1 )+0x40 );
	}
}

显示字符 或 字符串

显示字符

void LCD_ShowChar(unsigned char Line,unsigned char Columu,unsigned char Char)
{
	LCD_SetCursor(Line,Columu);
	
	LCD_WriteData(Char);
}

显示字符串

void LCD_ShowString(unsigned char Line,unsigned char Columu,unsigned char* String)
{
	unsigned char i = 0;
	
	LCD_SetCursor(Line,Columu);
	
	for(i=0;String[i] != '\0';i++)
	{
		LCD_WriteData(String[i]);
	}
}

显示数字

获取次方数

int LCD_Pow(unsigned char x,unsigned char y)
{
	unsigned char i = 0;
	int result = 1;
	
	for(i=0;i<y;i++)
	{
		result *= x;
	}
	
	return result;
}

显示数字

void LCD_ShowNum(unsigned char Line,unsigned char Columu,unsigned int Num,unsigned int Length)
{
	unsigned char i = 0;
	
	LCD_SetCursor(Line,Columu);
	
	for(i=Length;i>0;i--)
	{
		LCD_WriteData('0'+Num/LCD_Pow(10,i-1)%10); //'0' 从0开始
	}
}

接线图

代码整合

LCD1602.c

#include "regx52.h"
#include "LCD1602.h"
#include "intrins.h"

sbit LCD_RS = P2^5;
sbit LCD_RW = P2^6;
sbit LCD_E  = P2^7;
sbit LED_V0 = P1^0;

#define LCD_DataPort P0

void Delay1ms()		//@11.0592MHz 1ms
{
	unsigned char i, j;

	_nop_();
	i = 2;
	j = 199;
	do
	{
		while (--j);
	} while (--i);
}

void LCD_WriteCommand(unsigned char Command)
{
		LCD_RS = 0;
		LCD_RW = 0;
		LCD_DataPort = Command;
		LCD_E  = 1;
		Delay1ms();
		LCD_E  = 0;
		Delay1ms();
		
}

void LCD_WriteData(unsigned char Data)
{
		LCD_RS = 1;
		LCD_RW = 0;
		LCD_DataPort = Data;
		LCD_E  = 1;
		Delay1ms();
		LCD_E  = 0;
		Delay1ms();
		
}

void LCD_Init()
{
		LCD_WriteCommand(0x38);
		LCD_WriteCommand(0x0c);
		LCD_WriteCommand(0x06);
		LCD_WriteCommand(0x01);
		LED_V0 = 0;
}

void LCD_SetCursor(unsigned char Line,unsigned char Columu)
{
	if(Line == 1)
	{
		LCD_WriteCommand( 0x80 | (Columu-1) );
	}
	else
	{
		LCD_WriteCommand( 0x80 | ( Columu-1 )+0x40 );
	}
}

void LCD_ShowChar(unsigned char Line , unsigned char Columu , unsigned char Char)
{
		LCD_SetCursor(Line,Columu);
	
		LCD_WriteData(Char);
}

void LCD_ShowString(unsigned char Line , unsigned char Columu , unsigned char* String)
{
		unsigned char i = 0;
	
		LCD_SetCursor(Line,Columu);
	
		for(i=0;String[i] != '\0';i++)
		{
				LCD_WriteData(String[i]);
		}
}

int LCD_Pow(unsigned char x,unsigned char y)
{
		int result = 1;
		unsigned char i = 0;
		
		for(i=0;i<y;i++)
		{
				result *= x;
		}
		
		return result;
}

void LCD_ShowNum(unsigned char Line,unsigned char Columu,unsigned int Num,unsigned int Length)
{
		unsigned char i = 0;
		
		LCD_SetCursor(Line,Columu);
		
		for(i=Length;i>0;i--)
		{
				LCD_WriteData('0'+Num/LCD_Pow(10,i-1)%10);
		}
}

LCD1602.h

#ifndef _LCD1602_h_
#define _LCD1602_h_

void Delay1ms(void);
void LCD_WriteCommand(unsigned char Command);
void LCD_WriteData(unsigned char Data);
void LCD_Init(void);
void LCD_SetCursor(unsigned char Line,unsigned char Columu);
void LCD_ShowChar(unsigned char Line,unsigned char Columu,unsigned char Char);
void LCD_ShowString(unsigned char Line,unsigned char Columu,unsigned char* String);
void LCD_ShowNum(unsigned char Line,unsigned char Columu,unsigned int Num,unsigned int Length);

#endif

main.c

#include "regx52.h"
#include "intrins.h"
#include "Timer0.h"
#include "uart.h"
#include "LCD1602.h"

void Delay500ms()		//@11.0592MHz
{
	unsigned char i, j, k;

	_nop_();
	i = 4;
	j = 129;
	k = 119;
	do
	{
		do
		{
			while (--k);
		} while (--j);
	} while (--i);
}

void main()
{
		LCD_Init();
		LCD_ShowChar(1,7,'Y');
		LCD_ShowString(2,2,"Hello!Yinyuer");
		LCD_ShowNum(1,8,689,3);
		
		while(1)
		{
				
		}
}

void UART_Routine() interrupt 4
{
		if( RI==1 )
		{
				P1=SBUF;
				UART_SendByte(SBUF);
				
				RI = 0;
		}
}

效果展示