【C51】Source code 5 -- LCD 1602 display characters

I have just learned the basic character display. Just character display requires a large number of various instruction formats. Let's write a program at this stage and summarize it:

Program function: Display characters in the center of the LCD: "Hello World", "By Fate"

Note: Use of LCD 1602: http://gaebolg.blog.163.com/blog/static/198269068201231665524137/

Attached is the source code: (I am a rookie, so there are inevitably some poorly written parts. It is only for backup purposes. Welcome to give me some advice, and please go away if you hate me...)

/*------------------------------------------------------------------------------------
LCD 1602 displays characters, "Hello World", "By Fate" are displayed in the center
-------------------------------------------------------------------------------------*/

#include
#include // Various functions, the empty function _nop_() is used here

sbit RS = P2^4;
sbit RW = P2^5;
sbit EN = P2^6;

#define DataPort P0

void Init_LCD(void); // Initialize LCD display

void LCD_Write_Com(unsigned char c); // write command to LCD
void LCD_Write_Data(unsigned char d); // write data to LCD

bit LCD_Busy(void); // LCD busy detection function, busy returns 1, idle returns 0
void LCD_Clear(void); // Clear screen

/*-----------------------------------------------------------------------------------------------------
LCD parameter setting: DL 0 = Data bus is 4 bits 1 = Data bus is 8 bits
　　　                N 0 = Display 1 line 1 = Display 2 lines
　　　                F 0 = 5x7 dots/each character 1 = 5x10 dots/each character
--------------------------------------------------------------------------------------*/
void LCD_Set_Argument(unsigned char DL, unsigned char N, unsigned charF);

/*---------------------------------------------------------------------------------------------------------------------------------------------------
LCD input mode setting: ID 0 = Cursor moves left after writing new data 1 = Cursor moves right after writing new data
　　　                       0 = Display does not move after writing new data 1 = Display moves right by 1 word after writing new data
------------------------------------------------------------------------------------------------------------------------------------*/
void LCD_Set_InputMode(unsigned char ID, unsigned char S);

/*---------------------------------------------------------------------------------------
LCD display settings: D 0 = Display function off 1 = Display function on
　　　                C 0 = No cursor 1 = With cursor
　　　                B 0 = Cursor does not blink 1 = Cursor blinks
--------------------------------------------------------------------------*/
void LCD_Set_DisplayMode(unsigned char D, unsigned char C, unsigned char B);

/*-----------------------------------------------------------
Display character c at row, column col
------------------------------------------------------------*/
void LCD_Write_Char(unsigned char row, unsigned char col, unsigned charc);

/*-----------------------------------------------------------
Starting from row, column col, display string s
------------------------------------------------------------*/
void LCD_Write_String(unsigned char row, unsigned char col, unsigned char *s);

void Delay(unsigned int t);
void Delay_ms(unsigned int t);       // 延迟 t ms

void main (void)
{
    Init_LCD();
    LCD_Write_Char(1, 3, 'H');
    LCD_Write_Char(1, 4, 'e');
    LCD_Write_Char(1, 5, 'l');
    LCD_Write_Char(1, 6, 'l');
    LCD_Write_Char(1, 7, 'o');
    LCD_Write_String(1, 9, "World!");
    LCD_Write_String(2, 5, "By Fate!");
    while (1);
}

void Init_LCD(void)
{
    LCD_Set_Argument(1, 1, 0); // Set basic parameters: 8-bit data bus, 2-line display, 5x7 dot matrix/character
    LCD_Set_DisplayMode(0, 0, 0); // Set display mode: turn off display, turn off cursor display, turn off cursor blinking
    LCD_Set_InputMode(1, 0); // Set input mode: for each character input, the cursor moves right and the screen does not move
    LCD_Clear(); // Clear the screen
    LCD_Set_DisplayMode(1, 0, 0); // Turn on display
}

void LCD_Write_Com(unsigned char c)
{
    while (LCD_Busy());
    RS = 0;
    RW = 0;
    EN = 1;
    DataPort = c;
    _nop_(); // Small delay, much smaller than Delay(), purpose: to make the data on the bus stable
    EN = 0; // Write operation is driven by EN falling edge
}

void LCD_Write_Data(unsigned char d)
{
    while (LCD_Busy());
    RS = 1;
    RW = 0;
    EN = 1;
    DataPort = d;
    _nop_();
    EN = 0;
}

bit LCD_Busy(void)
{
    DataPort = 0xFF;
    RS = 0;
    RW = 1;
    EN = 0;
    _nop_();
    EN = 1; // Read operation is EN = 1 drive
    return (bit)(DataPort & 0x80); // When forced to convert to bit, unless the original data is equal to 0, bit = 0, otherwise bit = 1
}

void LCD_Clear(void)
{
    LCD_Write_Com(0x01);
    Delay_ms(5);
}

void LCD_Set_Argument(unsigned char DL, unsigned char N, unsigned charF)
{
    DL <<= 4; // The instruction format determines the shift, see the instruction format requirements
    N <<= 3;
    F <<= 2;
    LCD_Write_Com(0x20 | DL | N | F);
    Delay_ms(5);
}

void LCD_Set_InputMode(unsigned char ID, unsigned char S)
{
    ID <<= 1;
    LCD_Write_Com(0x04 | ID | S);
    Delay_ms(5);
}

void LCD_Set_DisplayMode(unsigned char D, unsigned char C, unsigned char B)
{
    D <<= 2;
    C <<= 1;
    LCD_Write_Com(0x08 | D | C | B);
    Delay_ms(5);
}

void LCD_Write_Char(unsigned char row, unsigned char col, unsigned charc)
{
    if (row == 1) LCD_Write_Com(0x80 + col - 0x01); // From the instruction format, we can see that DB7 = 1, so add 80H
    else if (row == 2) LCD_Write_Com(0xC0 + col - 0x01);
    LCD_Write_Data(c);
}

void LCD_Write_String(unsigned char row, unsigned char col, unsigned char *s)
{
    if (row == 1) LCD_Write_Com(0x80 + col - 0x01);
    else if (row == 2) LCD_Write_Com(0xC0 + col - 0x01);
    while (*s) {
        LCD_Write_Data(*s);
        s++;
    }
}

void Delay(unsigned int t)
{
    while (t--);
}

void Delay_ms(unsigned int t) // According to the test, t ms can be represented fairly closely
{
    while (t--) {
        Delay(245);
        Delay(245);
    }
}