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/*=========================================================

1602液晶显示的实验例子

-------------------------------------------------

| DB4-----P0.4 | RW-------P2.1

| DB5-----P0.5 | RS-------P2.2

| DB6-----P0.6 | E--------P2.0

| DB7-----P0.7 |

---------------------------------------------------

LCD1602的简简单显示

=========================================================*/

#include

#include

#define LCM_RW P2_1 //定义引脚

#define LCM_RS P2_2

#define LCM_E P2_0

#define LCM_Data P0

#define Busy 0x80 //用于检测LCM状态字中的Busy标识

/*------------------------------------------

子函数声明

------------------------------------------*/

void Write_Data_LCM(unsigned char WDLCM);

void Write_Command_LCM(unsigned char WCLCM,BuysC);

void Read_Status_LCM(void);

void LCM_Init(void);

void Set_xy_LCM(unsigned char x, unsigned char y);

void Display_List_Char(unsigned char x, unsigned char y, unsigned char *s);

void main(void)

{

LCM_Init(); //LCM初始化

delay_nms(5);//延时片刻(可不要)

while(1)

{

Display_List_Char(0, 0, www.CSMZXY.COM);

Display_List_Char(1, 0, Robot-AT89S52);

}

}

/*=====================================

函数名：Read_Status_LCM()

功 能： 忙检测函数

======================================*/

void Read_Status_LCM(void)

{

unsigned char read=0;

LCM_RW = 1;

LCM_RS = 0;

LCM_E = 1;

LCM_Data = 0xff;

do

{

read = LCM_Data;

}

while(read Busy);

LCM_E = 0;

}

/*-------------------------------------------

函数名：Write_Data_LCM ( )

功 能： 对LCD 1602写数据

--------------------------------------------*/

void Write_Data_LCM(unsigned char WDLCM)

{

Read_Status_LCM(); //检测忙

LCM_RS = 1;

LCM_RW = 0;

LCM_Data = 0x0f;

LCM_Data |= WDLCM0xf0;

LCM_E = 1; //若晶振速度太高可以在这后加小的延时

LCM_E = 1; //延时

LCM_E = 0;

WDLCM = WDLCM4;

LCM_Data = 0x0f;

LCM_Data |= WDLCM0xf0;

LCM_E = 1;

LCM_E = 1; //延时

LCM_E = 0;

}

/*-------------------------------------------

函数名：Write_Command_ LCM ( )

功 能： 对LCD 1602写指令

--------------------------------------------*/

void Write_Command_LCM(unsigned char WCLCM,BuysC) //BuysC为0时忽略忙检测

{

if (BuysC)

Read_Status_LCM(); //根据需要检测忙

LCM_RS = 0;

LCM_RW = 0;

LCM_Data = 0x0f;

LCM_Data |= WCLCM0xf0;//传输高四位

LCM_E = 1;

LCM_E = 1;

LCM_E = 0;

WCLCM = WCLCM4; //传输低四位

LCM_Data = 0x0f;

LCM_Data |= WCLCM0xf0;

LCM_E = 1;

LCM_E = 1;

LCM_E = 0;

}

/*-------------------------------------------

函数名：LCM_Init()

功 能： 对LCD 1602初始化

--------------------------------------------*/

void LCM_Init(void) //LCM初始化

{

LCM_Data = 0;

Write_Command_LCM(0x28,0); //三次显示模式设置，不检测忙信号

delay_nms(15);

Write_Command_LCM(0x28,0);

delay_nms(15);

Write_Command_LCM(0x28,0);

delay_nms(15);

Write_Command_LCM(0x28,1); //显示模式设置,开始要求每次检测忙信号

Write_Command_LCM(0x08,1); //关闭显示

Write_Command_LCM(0x01,1); //显示清屏

Write_Command_LCM(0x06,1); //显示光标移动设置

Write_Command_LCM(0x0C,1); //显示开及光标设置

}

/*-------------------------------------------

函数名：Set_xy_LCM ()

功 能：设定显示坐标位置

--------------------------------------------*/

void Set_xy_LCM(unsigned char x, unsigned char y)

{

unsigned char address;

if( x == 0 )

address = 0x80+y;

else

address = 0xc0+y;

Write_Command_LCM(address,1);

}

/*-------------------------------------------

函数名：Display_List_Char()

功 能：按指定位置显示一串字符

--------------------------------------------*/

void Display_List_Char(unsigned char x, unsigned char y, unsigned char *s)

{

Set_xy_LCM(x,y);

while(*s)

{

LCM_Data = *s;

Write_Data_LCM(*s);

s++;

}

}