LCD1602的簡單顯示程序

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

1602液晶顯示的實驗例子

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

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

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

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

| DB7-----P0.7 |

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

LCD1602的簡簡單顯示

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

#include

#include

#define LCM_RW P2_1 //定義引腳

#define LCM_RS P2_2

#define LCM_E P2_0

#define LCM_Data P0

#define Busy 0x80 //用于檢測LCM狀態(tài)字中的Busy標識

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

子函數(shù)聲明

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

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);//延時片刻(可不要)

while(1)

{

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

Display_List_Char(1, 0, "Robot-AT89S52");

}

}

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

函數(shù)名：Read_Status_LCM()

功 能： 忙檢測函數(shù)

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

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;

}

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

函數(shù)名：Write_Data_LCM ( )

功 能： 對LCD 1602寫數(shù)據(jù)

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

void Write_Data_LCM(unsigned char WDLCM)

{

Read_Status_LCM(); //檢測忙

LCM_RS = 1;

LCM_RW = 0;

LCM_Data &= 0x0f;

LCM_Data |= WDLCM&0xf0;

LCM_E = 1; //若晶振速度太高可以在這后加小的延時

LCM_E = 1; //延時

LCM_E = 0;

WDLCM = WDLCM<<4;

LCM_Data &= 0x0f;

LCM_Data |= WDLCM&0xf0;

LCM_E = 1;

LCM_E = 1; //延時

LCM_E = 0;

}

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

函數(shù)名：Write_Command_ LCM ( )

功 能： 對LCD 1602寫指令

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

void Write_Command_LCM(unsigned char WCLCM,BuysC) //BuysC為0時忽略忙檢測

{

if (BuysC)

Read_Status_LCM(); //根據(jù)需要檢測忙

LCM_RS = 0;

LCM_RW = 0;

LCM_Data &= 0x0f;

LCM_Data |= WCLCM&0xf0;//傳輸高四位

LCM_E = 1;

LCM_E = 1;

LCM_E = 0;

WCLCM = WCLCM<<4; //傳輸?shù)退奈?/p>

LCM_Data &= 0x0f;

LCM_Data |= WCLCM&0xf0;

LCM_E = 1;

LCM_E = 1;

LCM_E = 0;

}

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

函數(shù)名：LCM_Init()

功 能： 對LCD 1602初始化

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

void LCM_Init(void) //LCM初始化

{

LCM_Data = 0;

Write_Command_LCM(0x28,0); //三次顯示模式設(shè)置，不檢測忙信號

delay_nms(15);

Write_Command_LCM(0x28,0);

delay_nms(15);

Write_Command_LCM(0x28,0);

delay_nms(15);

Write_Command_LCM(0x28,1); //顯示模式設(shè)置,開始要求每次檢測忙信號

Write_Command_LCM(0x08,1); //關(guān)閉顯示

Write_Command_LCM(0x01,1); //顯示清屏

Write_Command_LCM(0x06,1); //顯示光標移動設(shè)置

Write_Command_LCM(0x0C,1); //顯示開及光標設(shè)置

}

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

函數(shù)名：Set_xy_LCM ()

功 能：設(shè)定顯示坐標位置

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

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);

}

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

函數(shù)名：Display_List_Char()

功 能：按指定位置顯示一串字符

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

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++;

}

}