#include<reg52.h>
#define LCD1602_DB P0 //data bus 數據總線
sbit LCD1602_RS = P2^6;
sbit LCD1602_RW = P2^5;
sbit LCD1602_EN = P2^7;
void InitLcd1602();
void LcdShowStr(unsigned char x,unsigned char y,unsigned char *str);
void main()
{
unsigned char str[] = "Welcome To You";
InitLcd1602();
LcdShowStr(0,0,str);
while(1);
}
void Read_Busy() //忙檢測函數，判斷bit7是0，允許執行；1禁止
{
unsigned char sta; //
LCD1602_DB = 0xff;
LCD1602_RS = 0;
LCD1602_RW = 1;
do
{
LCD1602_EN = 1;
sta = LCD1602_DB;
LCD1602_EN = 0; //使能，用完就拉低，釋放總線
}while(sta & 0x80);
}
void Lcd1602_Write_Cmd(unsigned char cmd) //寫命令
{
Read_Busy();
LCD1602_RS = 0;
LCD1602_RW = 0;
LCD1602_DB = cmd;
LCD1602_EN = 1;
LCD1602_EN = 0;
}
void Lcd1602_Write_Data(unsigned char dat) //寫數據
{
Read_Busy();
LCD1602_RS = 1;
LCD1602_RW = 0;
LCD1602_DB = dat;
LCD1602_EN = 1;
LCD1602_EN = 0;
}
void LcdSetCursor(unsigned char x,unsigned char y) //坐標顯示
{
unsigned char addr;
if(y == 0)
addr = 0x00 + x;
else
addr = 0x40 + x;
Lcd1602_Write_Cmd(addr|0x80);
}
void LcdShowStr(unsigned char x,unsigned char y,unsigned char *str) //顯示字符串
{
LcdSetCursor(x,y); //當前字符的坐標
while(*str != '\0')
{
Lcd1602_Write_Data(*str++);
}
}
void InitLcd1602() //1602初始化
{
Lcd1602_Write_Cmd(0x38); //打開，5*8,8位數據
Lcd1602_Write_Cmd(0x0c);
Lcd1602_Write_Cmd(0x06);
Lcd1602_Write_Cmd(0x01); //清屏
}
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