18: LCD12864 display

#Instruction System

#Code

* 【Course 19】 ****LCD12864 Experiment***********

*

* 【Explanation】 ****There is no ready-made font library in the simulation environment, so you need to make your own Chinese character font library

*

* 【Description】 ****Show "Sourceshare Technology"

*

******************************************************************     

Basic operations:

Read status: RS=0,RW=1,EN=1

Output: D0~D7=status word;

Write instruction: RS=0, RW=0, EN=falling edge pulse

D0~D7=instruction code;

Read data: RS=1, RW=1, EN=1

Output: D0~D7=data;

Write data: RS=1, RW=1, EN=falling edge pulse

D0~D7=data;

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

#include //51 header file,

//---------Two commonly used macro definitions-------------- 

#define uint8 unsigned char

#define uint16  unsigned int

//--------12864 control pin definition-------------

sbit RS = P3^5;

sbit RW = P3^6;

sbit EN = P3^4;

sbit CS2 = P3^0;

sbit CS1 = P3^1;

uint8 code yuan[]=

{

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

; Source file/text: source

; Width × height (pixels): 16×16

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

 0x10,0x21,0x06,0xE0,0x00,0xFE,0x02,0xF2,

 0x5A,0x56,0x52,0x52,0x52,0xF2,0x02,0x00,

 0x04,0xFC,0x03,0x40,0x30,0x0F,0x20,0x11,

 0x4D,0x81,0x7F,0x01,0x05,0x09,0x30,0x00

};

uint8 code xiang[]=

{

 0x00,0x04,0x04,0x74,0x54,0x54,0x55,0x56,

 0x54,0x54,0x54,0x74,0x04,0x04,0x00,0x00,

 0x08,0x08,0x09,0x09,0x09,0x29,0x49,0x89,

 0x7D,0x0B,0x0B,0x09,0x08,0x08,0x08,0x00

};

uint8 code k[]=

{

/*-- Character: Family --*/

/*-- Songti 12; The corresponding dot matrix under this font is: width x height = 16x16 --*/

 0x10,0x12,0x92,0x72,0xFE,0x51,0x91,0x00,

 0x22,0xCC,0x00,0x00,0xFF,0x00,0x00,0x00,

 0x04,0x02,0x01,0x00,0xFF,0x00,0x04,0x04,

 0x04,0x02,0x02,0x02,0xFF,0x01,0x01,0x00

};

uint8 code ji[]=

{

/*-- Character: Technique --*/

/*-- Songti 12; The corresponding dot matrix under this font is: width x height = 16x16 --*/

 0x08,0x08,0x88,0xFF,0x48,0x28,0x00,0xC8,

 0x48,0x48,0x7F,0x48,0xC8,0x48,0x08,0x00,

 0x01,0x41,0x80,0x7F,0x00,0x40,0x40,0x20,

 0x13,0x0C,0x0C,0x12,0x21,0x60,0x20,0x00

};

//-----------Function declaration------------------

void DelayMS(uint16 dly);

//----------Declaration of LCD module---------------

bit BUSY(void); //测忙

void Write_cmd(uint8 cmd); //write command

void Write_dat(uint8 dat); //write data

//void LCD_Init(void);

void Set_page(uint8 page); //Set page

void Set_Line(uint8 line); //Set the starting line

void Set_Col(uint8 col); //Set column

void Set_ONOFF(uint8 switch); //1 on, 0 off

void Clear(void); //清屏

void LCD_Init(void); //LCD screen initialization

void Display(uint8 screen,uint8 page,uint8 col,uint8 *p); //Display Chinese characters

void Select_Screen(uint8 swich); //Select LCD screen (left or right)

//---------Main Task---------------------

void main(void)

{

LCD_Init();

Display(1,0,0,yuan); //source

Display(1,2,0,xiang); //enjoy

Display(1,4,0,ke); //科

Display(1,6,0,ji); //技

Display(2,0,0,yuan);

Display(2,2,0,xiang);

Display(2,4,0,ke);

Display(2,6,0,ji);

while(1)

{

}

}

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

** Name: void DelayMS(uint16 dly)

** Function: millisecond delay (12M crystal oscillator)

** Input parameter: dly

User delay parameters   

** Export parameters: None   

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

void DelayMS(uint16 dly)

{

uint16 x,y;

for(x=dly;x>0;x--)

for(y=124;y>0;y--);

}

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

** Name: bit BUSY(void)

** Function: Check whether LCD1602 is in busy state;

** Input parameters: None   

** Export parameter: bit Bit

Returns 1, then BUSY

Return 0, then OK   

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

bit BUSY(void)

{

bit Bit;

P0 = 0x00;

RS = 0;

RW = 1;

EN = 1;

DelayMS(1);

Bit = (bit)(P0 & 0x80); //The highest bit is the busy signal bit

EN = 0;

return Bit;

}

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

** Name: void Write_cmd(uint8 cmd)

** Function: Write command

** Entry parameter: cmd

control commands   

** Export parameters: None   

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

void Write_cmd(uint8 cmd)

{

while(BUSY()); //测忙

RS = 0;

RW = 0;

EN = 0;

P0 = cmd;

EN = 1;

DelayMS(1);

EN = 0;

}

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

** Required: void Write_dat(uint8 dat)

** Function: write data

** Input parameter: dat

Data to display  

** Export parameters: None   

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

void Write_dat(uint8 dat)

{

while(BUSY()); //测忙

RS = 1;

RW = 0;

EN = 0;

P0 = that;

EN = 1;

DelayMS(1);

EN = 0;

}

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

** Name: void LCD_Init(void)

** Function: LCD initialization

** Input parameters: None 

** Export parameters: None   

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

/*void LCD_Init(void)

{

Write_cmd(0x34); //Extended instruction operation

    DelayMS(5);

    Write_cmd(0x30); //Basic instruction operation

    DelayMS(5);

    Write_cmd(0x0C); //Display on and off cursor

    DelayMS(5);

    Write_cmd(0x01); //Clear the LCD display content

    DelayMS(5);

}*/

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

** Name: void Set_page(uint8 page)

** Function: Settings page

** Input parameter: uint8 

Page 0~7 Total 8 pages 

** Export parameters: None   

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

void Set_page(uint8 page)

{

page = 0xb8|page; //The first address of the page is 0XB8

Write_cmd(page);

}

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

** Name: void Set_Line(uint8 line)

** Function: Set the starting line

** Input parameter: uint8 

line

** Export parameters: None   

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

void Set_Line(uint8 line)

{

line = 0xc0|line;

Write_cmd(line);

}

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

** Name: void Set_Col(uint8 col)

** Function: Set the starting position of the column

** Input parameter: uint8 

col

** Export parameters: None   

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

void Set_Col(uint8 col)

{

col = col&0x3f;

col = 0x40|col;

Write_cmd(col);

}

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

** Name: void Select_Screen(uint8 switch)

** Function: Select screen --- left and right screen

** Input parameter: uint8 

switch

** Export parameters: None   

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

void Select_Screen(uint8 swich)

{

switch(swich)

{

case 0: CS1 = CS2 =0; //full screen

break;

case 1: CS1 = 0; CS2 = 1; //left screen

break;

case 2: CS1 =1; CS2 = 0; //右屏

break;

default:

break;

}

}

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

** Name: void Set_ONOFF(uint8 switch) //0 or 1

** Function: Set the display switch

** Input parameter: uint8 

swich 0---off

1---Open

** Export parameters: None   

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

void Set_ONOFF(uint8 switch) //0 or 1

{

swich = 0x3e|swich;

Write_cmd(swich);

}

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

** 名称 ：void Clear(void)

** Function: Clear screen

** Input parameters: None

** Export parameters: None   

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

void Clear(void)

{

uint8 i,j;

for(i=0;i<8;i++)

{

Set_page(i);

Set_Col(0);

for(j=0;j<64;j++)

{

Write_dat(0x00);

}

}

}

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

** Name: void LCD_Init(void)

** Function: Initialization

** Input parameters: None

** Export parameters: None   

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

void LCD_Init(void)

{

while(BUSY()); //测忙

Set_ONOFF(1);

Clear();

Set_Line(0);

}

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

** 名称 ：void Display(uint8 screen,uint8 page,uint8 col,uint8 *p)

** Function: Display of Chinese characters

** Input parameter: uint8 

screen

page

col column

*p Displayed Chinese character pointer

** Export parameters: None   

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

void Display(uint8 screen,uint8 page,uint8 col,uint8 *p)

{

uint8 i;

Select_Screen(screen);

Set_page(page);

Set_Col(col);

for(i=0;i<16;i++)

{

Write_dat(p[i]);

}

Set_page(page+1);

Set_Col(col);

for(i=0;i<16;i++)

{

Write_dat(p[i+16]);

}

}