#include <reg52.h>
/*=================================================
*自定義數(shù)據(jù)類型
=================================================*/
typedef unsigned char uchar;
typedef unsigned int uint;
#define LCD1602_DB P0 //LCD1602數(shù)據(jù)總線
sbit LCD1602_RS = P3^5; //RS端
sbit LCD1602_RW = P3^6; //RW端
sbit LCD1602_EN = P3^4; //EN端
sbit DU = P2^6;//
sbit WE = P2^7;//數(shù)碼管位選段選用于關閉數(shù)碼管顯示
/*=================================================
*函數(shù)名稱：Read_Busy
*函數(shù)功能：判斷1602液晶忙，并等待
=================================================*/
void Read_Busy()
{
uchar busy;
LCD1602_DB = 0xff;//復位數(shù)據(jù)總線
LCD1602_RS = 0; //拉低RS
LCD1602_RW = 1; //拉高RW讀
do
{
LCD1602_EN = 1;//使能EN
busy = LCD1602_DB;//讀回數(shù)據(jù)
LCD1602_EN = 0; //拉低使能以便于下一次產(chǎn)生上升沿
}while(busy & 0x80); //判斷狀態(tài)字BIT7位是否為1，為1則表示忙，程序等待
}
/*=================================================
*函數(shù)名稱：LCD1602_Write_Cmd
*函數(shù)功能：寫LCD1602命令
*調(diào)用：Read_Busy();
*輸入：cmd:要寫的命令
=================================================*/
void LCD1602_Write_Cmd(uchar cmd)
{
Read_Busy(); //判斷忙，忙則等待
LCD1602_RS = 0;
LCD1602_RW = 0; //拉低RS、RW操作時序情況1602課件下中文使用說明基本操作時序章節(jié)
LCD1602_DB = cmd;//寫入命令
LCD1602_EN = 1; //拉高使能端 數(shù)據(jù)被傳輸?shù)絃CD1602內(nèi)
LCD1602_EN = 0; //拉低使能以便于下一次產(chǎn)生上升沿
}
/*=================================================
*函數(shù)名稱：LCD1602_Write_Dat
*函數(shù)功能：寫LCD1602數(shù)據(jù)
*調(diào)用：Read_Busy();
*輸入：dat：需要寫入的數(shù)據(jù)
=================================================*/
void LCD1602_Write_Dat(uchar dat)
{
Read_Busy();
LCD1602_RS = 1;
LCD1602_RW = 0;
LCD1602_DB = dat;
LCD1602_EN = 1;
LCD1602_EN = 0;
}
/*=================================================
*函數(shù)名稱：LCD1602_Dis_OneChar
*函數(shù)功能：在指定位置顯示 *一個* 字符
*調(diào)用：LCD1602_Write_Cmd(); LCD1602_Write_Dat();
*輸入：x：要顯示的橫坐標取值0-40，y：要顯示的行坐標取值0-1（0為第一行,1為第二行）
dat：需要顯示的數(shù)據(jù)以ASCLL形式顯示
=================================================*/
void LCD1602_Dis_OneChar(uchar x, uchar y,uchar dat)
{
if(y) x |= 0x40;//第二行時
x |= 0x80;
LCD1602_Write_Cmd(x);
LCD1602_Write_Dat(dat);
}
/*=================================================
*函數(shù)名稱：LCD1602_Dis_Str
*函數(shù)功能：在指定位置顯示字符串
*調(diào)用：LCD1602_Write_Cmd(); LCD1602_Write_Dat();
*輸入：x：要顯示的橫坐標取值0-40，y：要顯示的行坐標取值0-1（0為第一行,1為第二行）
*str：需要顯示的字符串
=================================================*/
void LCD1602_Dis_Str(uchar x, uchar y, uchar *str)
{
if(y) x |= 0x40;
x |= 0x80;
LCD1602_Write_Cmd(x);
while(*str != '\0')
{
LCD1602_Write_Dat(*str++);
}
}
/*=================================================
*函數(shù)名稱：Init_LCD1602
*函數(shù)功能：1602初始化
*調(diào)用： LCD1602_Write_Cmd();
=================================================*/
void Init_LCD1602()
{
LCD1602_Write_Cmd(0x38); // 設置16*2顯示，5*7點陣，8位數(shù)據(jù)接口
LCD1602_Write_Cmd(0x0c); //開顯示
LCD1602_Write_Cmd(0x06); //讀寫一字節(jié)后地址指針加1
LCD1602_Write_Cmd(0x01); //清除顯示
}
void main()
{
uchar TestStr[] = {"Welcome!"};//字符串數(shù)組
DU = 0;
WE = 0;//關閉數(shù)碼管顯示
Init_LCD1602();//1602初始化
LCD1602_Dis_Str(0, 0, &TestStr[0]); //顯示字符串
LCD1602_Dis_OneChar(10, 1, 0xff); //（1,10）后顯示一個黑方格
while(1);
}
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