LCD1602 四线程序测试成功(每根线单独定义)

2020-01-18 18:45发布

上图:

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程序:
#include<AT89X52.h>

//lcd part
#define          LINE1                             0
#define          LINE2                             1
#define          LINE1_HEAD                            0x80
#define          LINE2_HEAD                            0xC0
#define          CLEARSCREEN                            LCD_en_com(0x01)
/*************************************/
//change this part at different board
sbit DB7=P2^6;
sbit DB6=P2^5;
sbit DB5=P2^4;
sbit DB4=P2^3;
sbit LCD1602_RS=P2^0;   //data command select  1 data  0 command  pin 4
sbit LCD1602_RW=P2^1;   //read write select   1 read   0 write     pin 5
sbit LCD1602_EN=P2^2;   //LCD enable signal             pin 6
/********************************************************************/
void delay(unsigned int n)      
{
    unsigned int i=0,j=0;
    for (i=n;i>0;i--)
     for (j=0;j<12;j++);  
}
void LCD_en_com(unsigned char command)
{
        DB7=(command>>7)%2;
        DB6=(command>>6)%2;
        DB5=(command>>5)%2;
        DB4=(command>>4)%2;
        LCD1602_RS = 0;           //RS 0
        LCD1602_RW = 0;                //RW 0
        LCD1602_EN = 1;        //EN --|/__        Write command
        delay(2);
        LCD1602_EN = 0;

        DB7=(command>>3)%2;
        DB6=(command>>2)%2;
        DB5=(command>>1)%2;
        DB4=(command>>0)%2;
        LCD1602_RS = 0;           //RS 0
        LCD1602_RW = 0;                //RW 0
        LCD1602_EN = 1;        //EN --|/__        Write command
        delay(2);
        LCD1602_EN = 0;
}
void LCD_en_dat(unsigned char command)
{
    DB7=(command>>7)%2;
        DB6=(command>>6)%2;
        DB5=(command>>5)%2;
        DB4=(command>>4)%2;
        LCD1602_RS = 1;        //RS 1
        LCD1602_RW = 0;                //RW 0
        LCD1602_EN = 1;        //EN --|/__        Write data
        delay(2);
        LCD1602_EN = 0;

        DB7=(command>>3)%2;
        DB6=(command>>2)%2;
        DB5=(command>>1)%2;
        DB4=(command>>0)%2;
        LCD1602_RS = 1;        //RS 1
        LCD1602_RW = 0;                //RW 0
        LCD1602_EN = 1;        //EN --|/__        Write data
        delay(2);
        LCD1602_EN = 0;
}
void LCD_set_xy(unsigned char x,unsigned char y)
{
        unsigned char address;
        if(y == LINE1)       
                address = LINE1_HEAD + x;
        else                        
                address = LINE2_HEAD + x;
        delay(10);
        LCD_en_com(address);
}
void LCD_write_string(unsigned char x,unsigned char y,unsigned char *s)
{
        LCD_set_xy(x,y);
        while(*s)  
        {
                LCD_en_dat(*s);   
                s++;
        }
}
void LCD_init(void)
{
delay(50);
LCD_en_com(0x33);//原来1602初始化成4位数据线之前必需先初始化成8位(此时命令发送方式是8位格式,但数据线只需接4位)
delay(10);
LCD_en_com(0x32);//然后再改到4位线宽,这样初始化才稳定
delay(10);
LCD_en_com(0x28);//四线模式设置
delay(10);
LCD_en_com(0x0c);//显示开--对应开关显示控制指令
delay(10);
CLEARSCREEN;
delay(30);
}
/********************************************************************/

void main(void)
{
LCD_init();
   LCD_write_string(0,LINE1,"0123456789abcdef");
   LCD_write_string(3,LINE2,"Advanced");
  while(1);                  
}
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95条回答
513696765
1楼-- · 2020-01-24 09:59
http://www.ourdev.cn/bbs/bbs_content.jsp?bbs_sn=4622534&bbs_page_no=1&search_mode=1&search_text=1602&bbs_id=9999
summerstar
2楼-- · 2020-01-24 13:21
 精彩回答 2  元偷偷看……
zhangjinxing
3楼-- · 2020-01-24 14:59
mark
millwood0
4楼-- · 2020-01-24 20:23
"DB7=(command>>7)%2;  "

try this:

"DB7=(command & 0x80)? 1:0;"

always work on any compiler.
millwood0
5楼-- · 2020-01-25 01:06
"LCD_en_com(0x33);//原来1602初始化成4位数据线之前必需先初始化成8位(此时命令发送方式是8位格式,但数据线只需接4位)  "

if you look at 44780's datasheet, you will see that the above isn't in compliance with the datasheet.

"DB7=(bit)(command&0x80);"

poor portability and it is compiler dependent: "bit" isn't a C type.
millwood0
6楼-- · 2020-01-25 03:19
"LCD1602_RS = 1; //RS 1   
LCD1602_RW = 0; //RW 0   "

if you change those from set / clear bit operations, you can pretty much run the same code on many different chips.

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