1602 display based on 51 single chip microcomputer

Code:

main.c file

#include "public.h"

#include "lcd1602.h"

/*******************************************************************************

* Function name: main

* Function : Main function

* Input: None

* Output    : None

*******************************************************************************/

void main()

{

int a=111;

lcd1602_init(); //LCD1602 initialization

lcd1602_clear(); //full screen

lcd1602_show_string(0,0,"Hello World!");//First line display

lcd1602_show_string(0,1,"0123456789");//The second line is displayed

while(1)

{

LcdSetCursor(12,1); //You can set where to start writing

LCDNumPrint(a); //Can display variables, this sets three numbers, which can be changed

}

}

lcd1602.c file

#include "lcd1602.h"

/*******************************************************************************

* Function name: lcd1602_write_cmd

* Function : LCD1602 write command

* Input: cmd: command

* Output    : None

*******************************************************************************/

#if (LCD1602_4OR8_DATA_INTERFACE==0)//8位LCD

void lcd1602_write_cmd(u8 cmd)

{

LCD1602_RS=0; //Select command

LCD1602_RW=0; //Select write

LCD1602_E=0;

LCD1602_DATAPORT=cmd; //Prepare command

delay_ms(1);

LCD1602_E=1; //Enable pin E to write on rising edge first

delay_ms(1);

LCD1602_E=0; // enable pin E and then negative jump to complete writing

}

#else //4th LCD

void lcd1602_write_cmd(u8 cmd)

{

LCD1602_RS=0; //Select command

LCD1602_RW=0; //Select write

LCD1602_E=0;

LCD1602_DATAPORT=cmd; //Prepare command

delay_ms(1);

LCD1602_E=1; //Enable pin E to write on rising edge first

delay_ms(1);

LCD1602_E=0; // enable pin E and then negative jump to complete writing

LCD1602_DATAPORT=cmd<<4; //Prepare command

delay_ms(1);

LCD1602_E=1; //Enable pin E to write on rising edge first

delay_ms(1);

LCD1602_E=0; // enable pin E and then negative jump to complete writing

}

#endif

/*******************************************************************************

* Function name: lcd1602_write_data

* Function : LCD1602 write data

* Input: dat: data

* Output    : None

*******************************************************************************/

#if (LCD1602_4OR8_DATA_INTERFACE==0)//8位LCD

void lcd1602_write_data(u8 dat) 

{

LCD1602_RS=1; //Select data

LCD1602_RW=0; //Select write

LCD1602_E=0;

LCD1602_DATAPORT=dat; //Prepare data

delay_ms(1);

LCD1602_E=1; //Enable pin E to write on rising edge first

delay_ms(1);

LCD1602_E=0; // enable pin E and then negative jump to complete writing

}

#else

void lcd1602_write_data(u8 dat) 

{

LCD1602_RS=1; //Select data

LCD1602_RW=0; //Select write

LCD1602_E=0;

LCD1602_DATAPORT=dat; //Prepare data

delay_ms(1);

LCD1602_E=1; //Enable pin E to write on rising edge first

delay_ms(1);

LCD1602_E=0; // enable pin E and then negative jump to complete writing

LCD1602_DATAPORT=dat<<4; //Prepare data

delay_ms(1);

LCD1602_E=1; //Enable pin E to write on rising edge first

delay_ms(1);

LCD1602_E=0; // enable pin E and then negative jump to complete writing

}

#endif

/*******************************************************************************

* Function name: lcd1602_init

* Function : LCD1602 initialization

* Input: None

* Output    : None

*******************************************************************************/

#if (LCD1602_4OR8_DATA_INTERFACE==0)//8位LCD

void lcd1602_init(void)

{

lcd1602_write_cmd(0x38); //Data bus 8 bits, display 2 lines, 5*7 dots/character

lcd1602_write_cmd(0x0c); //Display function on, no cursor, cursor flashing

lcd1602_write_cmd(0x06); //After writing new data, the cursor moves right, but the display screen does not move

lcd1602_write_cmd(0x01);//清屏

}

#else

void lcd1602_init(void)

{

lcd1602_write_cmd(0x28); //Data bus 4 bits, display 2 lines, 5*7 dots/character

lcd1602_write_cmd(0x0c); //Display function on, no cursor, cursor flashing

lcd1602_write_cmd(0x06); //After writing new data, the cursor moves right, but the display screen does not move

lcd1602_write_cmd(0x01);//清屏

}

#endif

/*******************************************************************************

* Function name: lcd1602_clear

* Function : LCD1602 clear screen

* Input: None

* Output    : None

*******************************************************************************/

void lcd1602_clear(void)

{

lcd1602_write_cmd(0x01);

}

/*******************************************************************************

* Function name: lcd1602_show_string

* Function : LCD1602 displays characters

* Input: x,y: display coordinates, x=0~15, y=0~1;

   str: Display string

* Output    : None

*******************************************************************************/

void lcd1602_show_string(u8 x,u8 y,u8 *str)

{

u8 i=0;

if(y>1||x>15)return; //Force exit if row and column parameters are incorrect

if(y<1) // Display the first line

{

while(*str!='')//The string ends with '', so it will be displayed as long as there is content in front of it

{

if(i<16-x) //If the character length exceeds the display range of the first line, continue to display in the second line

{

lcd1602_write_cmd(0x80+i+x); //The first line displays the address setting

}

else

{

lcd1602_write_cmd(0x40+0x80+i+x-16); //The second line displays the address setting

}

lcd1602_write_data(*str);//display content

str++; // pointer increment

i++;

}

}

else //Line 2 displays

{

while(*str!='')

{

if(i<16-x) //If the character length exceeds the display range of the second line, continue to display it in the first line

{

lcd1602_write_cmd(0x80+0x40+i+x);

}

else

{

lcd1602_write_cmd(0x80+i+x-16);

}

lcd1602_write_data(*str);

str++;

i++;

}

}

}

/*Set the display RAM start address, that is, the cursor position*/

void LcdSetCursor(u8 x,u8 y)

{

        u8 addr;

        if(y == 0)

                addr = 0x00 + x;

        else

                addr = 0x40 + x;

        lcd1602_write_cmd(addr | 0x80);

}

/*The LCD output number is currently three digits*/

void LCDNumPrint(int num)

{

  lcd1602_write_data(num / 100 + 0x30); //hundreds digit of num

        lcd1602_write_data(num % 100 /10 + 0x30); //tens digit of num

        lcd1602_write_data(num % 10 + 0x30); // the unit digit of num

}

lcd1602.h file

#ifndef _lcd1602_H

#define _lcd1602_H

#include "public.h"

//LCD1602 data port 4-bit and 8-bit definition, if it is 1, it is LCD1602 4-bit data port drive, otherwise it is 8-bit

#define LCD1602_4OR8_DATA_INTERFACE 0 //Default use 8-bit data port LCD1602

//Pin definition

sbit LCD1602_RS=P2^6; //Data command selection

sbit LCD1602_RW=P2^5; //Read and write selection

sbit LCD1602_E=P2^7; //enable signal

#define LCD1602_DATAPORT P0 //Macro definition of LCD1602 data port

// Function declaration

void lcd1602_init(void);

void lcd1602_clear(void);

void lcd1602_show_string(u8 x,u8 y,u8 *str);

void LCDNumPrint(int num);

void LcdSetCursor(u8 x,u8 y);

#endif

public.c file

#include "public.h"

/*******************************************************************************

* Function name: delay_10us

* Function : Delay function, when ten_us=1, the delay is about 10us

* Input: ten_us

* Output    : None

*******************************************************************************/

//void delay_10us(u16 ten_us)

//{

// while(ten_us--);

//}

/*******************************************************************************

* Function name: delay_ms

* Function : ms delay function, when ms=1, the delay is about 1ms

* Input: ms: ms delay time

* Output    : None

*******************************************************************************/

void delay_ms(u16 ms)

{

u16 i,j;

for(i=ms;i>0;i--)

for(j=110;j>0;j--);

}

public.h file

#ifndef _public_H

#define _public_H

#include "reg52.h"

typedef unsigned int u16; //Redefine the system default data type

typedef unsigned char u8;

typedef unsigned long u32;

void delay_10us(u16 ten_us);

void delay_ms(u16 ms);

#endif

operation result:

This code can display character constant numbers and variable numbers.