LCD1602驱动代码

LCD1602驱动代码

看手册和别人的代码然后自己在stc89c52rc上试了试

1. 先看接口图,定义端口

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2. 看1602手册 资料

  1. 首先设置1602的一些工作模式.
  2. 最基本的显示的工作方式就是向显存ddram写数据,恰好在rom里面的字符数据和ascii对应的,所以不需要转换
  3. 然后封装写命令和写数据的操作.注意操作寄存器的bit的要求就行.

3. 写命令和写数据

​ 读数据和读状态没啥意义;

​ 写数据的要求:

​ RS = 1,RW = 0,en=1->0

​ 写指令的要求:

​ RS = 0,RW = 0,en=1->0

​ 注意在给出使能信号后延时1ms让lcd1602工作.否则设定不会生效()

代码实现:

—- lcd1602.h

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#ifndef _LCD1602_H_
#define _LCD1602_H_

#include <REGX52.H>
//STC89C52RC 上 LCD1603端口
#define LCD_DATA_PORT P0
#define LCD_EN	P2_7
#define LCD_RS	P2_6
#define LCD_RW	P2_5

// 8bit数据接口,两行显示,5x8字符,=0x38
#define LCD_WORK_MODE 0x38
// 显示器开,光标不显示和不闪烁
#define	LCD_DISP_MODE1 0x0C
// 光标右移,显示的字符不移动
#define LCD_DISP_MODE2 0x06
// 清屏
#define LCD_DISP_MODE3 0x01


void LCD_init();
void LCD_write_data(unsigned char dat);
void LCD_write_command(unsigned char cmd);
void LCD_set_address(unsigned char line,unsigned char col);
void LCD_disp_char(unsigned char line,unsigned char col,unsigned char dat);
void LCD_disp_str(unsigned char line,unsigned char col,const char *str);
void LCD_disp_num(unsigned char line,unsigned char col,int num);
void LCD_disp_hex(unsigned char line,unsigned char col,int num);

#endif

—- lcd1602.c

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#include "lcd1602.h"
#include "runled.h"

//LCD1602 初始化
void LCD_init()
{
	//1.设置工作方式 0x38
	LCD_write_command(LCD_WORK_MODE);
	//2. 设置显示器开关控制: 0x0C
	LCD_write_command(LCD_DISP_MODE1);
	//3. 模式设置；0x06
	LCD_write_command(LCD_DISP_MODE2);
	//4. 清屏
	LCD_write_command(LCD_DISP_MODE3);
}

void LCD_write_data(unsigned char dat)
{
	LCD_RS = 1;
	LCD_RW = 0;
	LCD_DATA_PORT = dat;
	LCD_EN = 1;
	delay(1);
	LCD_EN = 0;
	delay(1);
}

void LCD_write_command(unsigned char cmd)
{
    LCD_RS = 0;
    LCD_RW = 0;
    LCD_DATA_PORT = cmd;
    //en使能信号从1->0表示执行指令
    LCD_EN = 1;
	delay(1);
    LCD_EN = 0;
	delay(1);
}

/*
 向DDRAM读写数据都要先设定读写的地址
 line[0,1]
 col [0,15]
*/
void LCD_set_address(unsigned char line,unsigned char col)
{
	//命令的db7非要是1
	int db7 = 0x80;
	unsigned char address[2] = {0x00,0x40};

	if (col>15)
	{
		line+=1;
		col-=16;
	}

	LCD_write_command(db7+address[line]+col);
}

void LCD_disp_char(unsigned char line,unsigned char col,unsigned char dat)
{
	//1.先设定ddram的写的地址
	LCD_set_address(line,col);
	//2.发送数据
	LCD_write_data(dat);
}

/*
	支持str超出行的范围后自动换行
*/
void LCD_disp_str(unsigned char line,unsigned char col,const char *str)
{
	unsigned char backup[16];
	unsigned char i = 0;
	unsigned char len;
	for(; i<16; i++)
		if (str[i] != '\0')
			backup[i] = str[i];
		else 
			break;
	len = i;
	i = 0;
	for (; i<len; i++)
	{
		LCD_disp_char(line,col+i,str[i]);
	}
}

/*
	num能显示数字的范围是[0,32767]
*/
void LCD_disp_num(unsigned char line,unsigned char col,int num)
{
	unsigned char str[10];
	unsigned char index = 0;
	unsigned char i = 0;
	//拿到数字的每一位
	while (num)
	{
		unsigned char base = '0';
		unsigned char mod = num%10;
		str[index++] = (base + mod);
		num = num/10;
	}

	//逆转str数组
	for (; i < index / 2; i++)
	{
		unsigned char tmp = str[i];
		str[i] = str[index - i - 1];
		str[index - i - 1] = tmp;
	}

	LCD_disp_str(line,col,str);
}

/*
	范围同理
*/
void LCD_disp_hex(unsigned char line,unsigned char col,int num)
{
	unsigned char str[10];
	unsigned char index = 0;
	unsigned char i = 0;
	unsigned char base;
	while (num)
	{
		unsigned char mod = num % 16;
		if (mod >= 10)
		{
			base = 'A';
			mod -= 10;
		}
		else
			base = '0';
		str[index++] = (base + mod);
		num = num / 16;
	}
	str[index] = '\0';

	for (; i<index/2; i++)
	{
		unsigned char tmp = str[i]; 
		str[i] = str[index-1-i];
		str[index-1-i] = tmp;
	}

	LCD_disp_str(line,col,str);
}

—- main.c

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#include <REGX52.H>
#include "runled.h"
#include "lcd1602.h"


void main()
{
	LCD_init();
	while (1)
	{
		
		char str[16] = "LCD1602 Hello!";
		LCD_disp_str(0,0,str);
		LCD_disp_num(1,0,32767);
		LCD_disp_hex(1,6,32767);
		
		//LCD_disp_hex(0,0,32767);
	}
}

3. 效果

3