LCD1602 Driver

LCD1602driver_inside.c

/*This driver depends on the reg51.h header file*/
#include


/*Modify macro definitions and sbit statements according to actual circuit connections*/
#define D0_D7 P3 //Data communication bus, used to write or read instructions, display addresses and display data
sbit RS = P2^5; //Register selection pin, set 0 to select instruction and display address registers, set 1 to select display data register
sbit RW = P2^6; //Read and write pin, set 0 to write, set 1 to read
sbit E = P2^7; //Signal enable pin, set 0 to allow writing, set 1 to allow reading
sbit BF = P3^7; //Busy signal, busy is 1, not busy is 0


/*Modify macro definitions and sbit statements according to actual circuit connections*/


/*Internal function declaration*/


bit Busy_Check(); //1602 busy signal detection, busy returns 1, not busy returns 0 (this function needs to be called before all write operations
void Data_Write(char Data); //Write 8-bit display data (supports direct reception of characters in the 1602 font library or corresponding ASCII code)
void Addr_Write(unsigned char Addr); //Write 8-bit display address
void Command_Write(unsigned char Command); //Write various commands of 1602
void Cursor_Reset(); //Reset the cursor position to the upper left corner
unsigned char Coordinate_To_Addr(unsigned char X_Intercept,unsigned char Y_Intercept); //Convert the input display coordinates to the corresponding display address and return
/*For single-line display, 0 <= X_Intercept <= 79, Y_Interce == 0; for double-line display, 0 <= X_Intercept <= 39, 0 <= Y_Interce <= 1; */
void DelayMS(unsigned int MS_Num); //Delay function MS
void Open_Screen_Inside(); //Screen display opening function
void Close_Screen_Inside(); //Screen display closing function
void Move_Screen_Left_Inside(); //Screen left movement function
void Move_Screen_Right_Inside(); //Screen right movement function
void Reset_D0_D7(); //Set the communication bus to low level
/*Internal function declaration*/


/*void main() //For syntax testing, uncomment the statements when using
{
    Reset_D0_D7();
    Command_Write(0x38);
    DelayMS(5);
    Command_Write(0x06);
    Open_Screen_Inside();
    DelayMS(5);
    Command_Write(0x01);
    DelayMS(5);
    Addr_Write(Coordinate_To_Addr(0,0)); 
    DelayMS(1);
    Data_Write('5');
    P3 = 0;
    Close_Screen_Inside();
    Open_Screen_Inside();
    Data_Write('6');
    Data_Write('7');
    Data_Write('7');
    Move_Screen_Inside(1);
    Move_Screen_Inside(1);
    Cursor_Reset();
    Data_Write('7');
    Data_Write('7');
    Move_Screen_Inside(1);
    while(1){P1 = 0;}
} */


/*Internal function definition*/
void Reset_D0_D7()
{
    D0_D7 = 0;
}


void DelayMS(unsigned int MS_ Num)
{
    unsigned char a,b;
    for(;MS_Num>0;MS_Num--)
        for(b=142;b>0;b--)
            for(a=2;a>0;a--);
}


bit Busy_Check()
{
// bit result;
// RS = 0;
// RW = 1;
// E = 1;
    DelayMS(1); // Pseudo busy check
// result = (bit)(P2&0x80);
// return result;
}


void Data_Write(char Data)
{
    RS = 1;
    RW = 0;
    E = 0;
    DelayMS(1);
    D0_D7 = Data;
    E = 1;
    DelayMS(1);
    E = 0;
}


void Addr_Write(unsigned char Addr)
{
    RS = 0;
    RW = 0;
    E = 0;
    DelayMS(1);
    D0_D7 = Addr;
    E = 1;
    DelayMS(1);
    E = 0;
}


void Command_Write(unsigned char Command)
{
    RS = 0;
    RW = 0;
    E = 0;
    DelayMS(1);
    D0_D7 = Command;
    E = 1;
    DelayMS(1);
    E = 0;
}


void Cursor_Reset()
{
    RS = 0;
    RW = 0;
    E = 0;
    DelayMS(1);
    D0_D7 = 0x02;
    E = 1;
    DelayMS(1);
    E = 0;
}


unsigned char Coordinate_To_Addr(unsigned char X_Intercept,unsigned char Y_Intercept)
{
    unsigned char Addr;
    if(Y_Intercept == 0)
    {
        Addr = 0x80 + X_Intercept;
    }
    if(Y_Intercept == 1)
    {
        Addr = 0xC0 + X_Intercept;
    }
    return Addr;
}


void Open_Screen_Inside()
{
    RS = 0;
    RW = 0;
    E = 0;
    Command_Write(0x0C);
    E = 1;
    DelayMS(1);
    E = 0;
}


void Close_Screen_Inside()
{
    RS = 0;
    RW = 0;
    E = 0;
    Command_Write(0x08);
    E = 1;
    DelayMS(1);
    E = 0;
}


void Move_Screen_Left_Inside()
{
    RS = 0;
    RW = 0;
    E = 0;
    Command_Write(0x18);       
    E = 1;
    DelayMS(1);
    E = 0;
}


void Move_Screen_Right_Inside()
{
    RS = 0;
    RW = 0;
    E = 0;
    Command_Write(0x1C);       
    E = 1;
    DelayMS(1);
    E = 0;
}

LCD1602driver_inside.h


#ifndef _LCD1602DRIVER_INSIDE_H_
#define _LCD1602DRIVER_INSIDE_H_ 


unsigned char Busy_Check();     //1602忙信号检测，忙返回1，不忙返回0(所有写操作前均需要调用此函数
void Data_Write(char Data);     //写入8位显示数据(支持直接接收1602字库内字符或对应ASCII码)
void Addr_Write(unsigned char Addr);        //写入8位显示地址
void Command_Write(unsigned char Command);      //写入1602的各种命令
void Cursor_Reset();        //光标位置重置为左上角
unsigned char Coordinate_To_Addr(unsigned char X_Intercept,unsigned char Y_Intercept); //Convert the input display coordinates to the corresponding display address and return
/*When displaying in single line, 0 <= X_Intercept <= 79, Y_Interce == 0; when displaying in double line, 0 <= X_Intercept <= 39, 0 <= Y_Interce <= 1; */
void DelayMS(unsigned int MS_Num);
void Open_Screen_Inside(); //Screen display opening function
void Close_Screen_Inside(); //Screen display closing function
void Move_Screen_Left_Inside(); //Screen left movement function
void Move_Screen_Right_Inside(); //Screen right movement function
void Reset_D0_D7(); //Set the communication bus to low level


#endif
 
LCD1602.c


/*


unsigned char Busy_Check(); //1602 busy signal detection, busy returns 1, not busy returns 0 (this function needs to be called before all write operations
void Data_Write(unsigned char Data); //Write 8-bit display data (supports direct reception of characters in the 1602 font or corresponding ASCII code)
void Addr_Write(unsigned char Addr); //Write 8-bit display address
void Command_Write(unsigned char Command); //Write various commands of 1602
void Cursor_Reset(); //Reset the cursor position to the upper left corner
unsigned char Coordinate_To_Addr(unsigned char X_Intercept,unsigned char Y_Intercept); //Convert the input display coordinates to the corresponding display address and return
/For double-line display, 0 <= X_Intercept <= 47, Y_Interce == 0; for single-line display, 0 <= X_Intercept <= 79, 0 <= Y_Interce <= 1;/


void DelayMS(unsigned int MS_Num);
void Open_Screen_Inside(); //Screen display opening function
void Close_Screen_Inside(); //Screen display closing function
void Move_Screen_Left_Inside(); //Screen left movement function
void Move_Screen_Right_Inside(); //Screen right movement function
void Reset_D0_D7(); //Set the communication bus to low level


*/
#include"LCD1602driver_inside.h"
#include       
//Includes internal functions. For specific contents, please refer to LCD1602driver_inside.h and LCD1602driver internal functions.c. To understand the function functions, you can also refer to the large comment at the beginning of this file.


/*Callable function declaration*/


void LCD1602_Init(unsigned char Line_Num,unsigned char Char_Type); //Initialization function, receiving the number of lines (1 or 2) and the dot matrix character type (1 or 2, corresponding to 5x7 and 5x10 dot matrix characters)
void LCD1602_Clear_Screen();
void LCD1602_Write_Char_Screen(char ASCII_Data,unsigned char X_Intercept,unsigned char Y_Intercept); //Single character output function; When displaying in a single line, 0 <= X_Intercept <= 79, Y_Interce == 0; When displaying in two lines, 0 <= X_Intercept <= 39, 0 <= Y_Interce <= 1; The screen will display the characters before the X coordinate of 15, and the other characters will be displayed by moving the cursor
void LCD1602_Write_Line_Screen(char Line_Data[28],unsigned char Y_Intercept); //Entire line output function; Need to receive 16 to 28 characters, 0 <= Y_Interce <= 1; The screen will display the first 16 characters, and the other characters will be displayed by moving the cursor 
void LCD1602_Open_Screen(); //Screen display opening function
void LCD1602_Close_Screen(); //Screen display closing function
void LCD1602_Move_Left_Screen(); //Screen moves one position to the left
void LCD1602_Move_Right_Screen(); //Screen moves one position to the right


/*Callable function declaration*/


/*void main() //For syntax testing, uncomment the statement when using it
{
    LCD1602_Init(2,1);
    LCD1602_Write_Line_Screen("123456",0);
    LCD1602_Write_Line_Screen("123456",1);
    LCD1602_Move_Screen(1);
    LCD1602_Move_Screen(0);
    LCD1602_Move_Screen(1);
    LCD1602_Move_Screen(1);


    while(1);
}       */


/*可调用函数定义*/


void LCD1602_Init(unsigned char Line_Num,unsigned char Char_Type)
{
    Reset_D0_D7();
    Command_Write(0x06);
    if(Line_Num == 1)
    {
        if(Char_Type == 2)
        {
            Command_Write(0x34);
        }
        else
        {
            Command_Write(0x30);
        }
    }
    else
    {
        if(Char_Type == 2)
        {
            Command_Write(0x3C);
        }
        else
        {
            Command_Write(0x38);
        }
    }
    DelayMS(5);
    LCD1602_Open_Screen();
    DelayMS(5);
    LCD1602_Clear_Screen();
    DelayMS(5);
}


void LCD1602_Clear_Screen()
{
    while(Busy_Check());
    Command_Write(0x01);
}


void LCD1602_Write_Char_Screen(char ASCII_Data,unsigned char X_Intercept,unsigned char Y_Intercept)
{
    while(Busy_Check());
    Addr_Write(Coordinate_To_Addr(X_Intercept,Y_Intercept));
    DelayMS(1);
    Data_Write(ASCII_Data);
}


void LCD1602_Write_Line_Screen(char Line_Data[28],unsigned char Y_Intercept)
{
    char Count;
    while(Busy_Check());
    Addr_Write(Coordinate_To_Addr(0,Y_Intercept));
    for(Count = 0;Line_Data[Count] != '';Count++)    //读到字符串结束标志后停止
    {
        Data_Write(Line_Data[Count]);
    }
}


void LCD1602_Open_Screen()
{
    Open_Screen_Inside();
}


void LCD1602_Close_Screen()
{
    Close_Screen_Inside();
}


void LCD1602_Move_Left_Screen()
{
     Move_Screen_Left_Inside();
}


void LCD1602_Move_Right_Screen()
{
     Move_Screen_Right_Inside();
}
/*可调用函数定义*/


 
 
LCD1602.H


#ifndef _LCD1602_H_
#define _LCD1602_H_
void LCD1602_Init(unsigned char Line_Num,unsigned char Char_Type);      //初始化函数，接收行数（1或2）和点阵字符类型（1或2,对应5x7和5x10点阵字符）
void LCD1602_Clear_Screen();
void LCD1602_Write_Char_Screen(char ASCII_Data,unsigned char X_Intercept,unsigned char Y_Intercept);        //单字符输出函数；单行显示时，0 <= X_Intercept <= 79，Y_Interce == 0；双行显示时，0 <= X_Intercept <= 39，0 <= Y_Interce <= 1；； 屏幕会显示X坐标在15之前的字符，其他字符通过光标移动显示
void LCD1602_Write_Line_Screen(char Line_Data[16],unsigned char Y_Intercept); //Full line output function; receive up to 28 characters, 0 <= Y_Intercept <= 1; the screen will display the first 16 characters, and the rest of the characters will be displayed by moving the screen 
void LCD1602_Open_Screen(); //Screen display opening function
void LCD1602_Close_Screen(); //Screen display closing function
void LCD1602_Move_Left_Screen(); //Screen moves left one position
void LCD1602_Move_Right_Screen(); //Screen moves right one position
#endif
 
driver_test.c


#include
#include"LCD1602driver_inside.h"
#include
#include
/*Header file contains function
void LCD1602_Init(unsigned char Line_Num,unsigned char Char_Type); //Initialization function, receive line number (1 or 2) and dot matrix character type (1 or 2, corresponding to 5x7 and 5x10 dot matrix characters)
void LCD1602_Clear_Screen();
void LCD1602_Write_Char_Screen(char ASCII_Data,unsigned char X_Intercept,unsigned char Y_Intercept); //Single character output function; when single line display, 0 <= X_Intercept <= 79, Y_Interce == 0; when double line display, 0 <= X_Intercept <= 39, 0 <= Y_Interce <= 1;; The screen will display the characters with X coordinate before 15, and other characters will be displayed by moving the cursor
void LCD1602_Write_Line_Screen(char Line_Data[16],unsigned char Y_Intercept); //Entire line output function; receive up to 16 characters, 0 <= Y_Interce <= 1; The screen will display the first 16 characters, and the other characters will be displayed by moving the cursor 
void LCD1602_Open_Screen(); //Screen display opening function
void LCD1602_Close_Screen(); //Screen display closing function
void LCD1602_Move_Left_Screen(); //Screen moves one position to the left
void LCD1602_Move_Right_Screen(); //Screen moves one position to the right
*/
void delay(void) //Delay 0.25S
{
    unsigned char a,b,c;
    for(c=3;c>0;c--)
        for(b=247;b>0;b--)
            for(a=142;a>0;a--);
                _nop_; 
}


void main()
{
    char Count;
    LCD1602_Init(2,1);
    while(1)
    {
        LCD1602_Clear_Screen();
        LCD1602_Write_Line_Screen(" A1411ZDK",0);
        LCD1602_Write_Line_Screen(" 2016*11*18",1);
        for(Count = 12;Count>=0;Count--)
        {
            LCD1602_Move_Right_Screen();
            delay();
        }    
    }
}