1602的驱动没有问题，编译以后提示
1602.C(112): warning C182: pointer to different objects
有问题吗？如果有怎末改呢？
#include <reg51.h>
#include <absacc.h>
#include <INTRINS.h>
#define LINE1 0
#define LINE2 1
#define LINE1_HEAD 0x80
#define LINE2_HEAD 0xC0
#define LCD_DELAY_TIME 40
#define DATA_MODE 0x38
#define OPEN_SCREEN 0x0C
#define DISPLAY_ADDRESS 0x80
#define CLEARSCREEN LCD_en_command(0x01)
#define HIGH 1
#define LOW 0
#define TRUE 1
#define FALSE 0
#define ZERO 0
#define MSB 0x80
#define LSB 0x01
#define Null 0
#define LCDIO P2
#define UP '3'
#define Down '7'
#define Esc 'B'
#define Enter 'F'
sbit LCD1602_RS=P0^7; //data command select 1 data 0 command pin 4
sbit LCD1602_RW=P0^6; //read write select 1 read 0 write pin 5
sbit LCD1602_EN=P0^5; //LCD enable signal pin 6
/********************************************************************/
void LCD_delay(void);//lcd delay function
void LCD_en_command(unsigned char command);//write command function
void LCD_en_dat(unsigned char temp);//write data function
void LCD_set_xy( unsigned char x, unsigned char y );//set display address function
void LCD_write_char( unsigned x,unsigned char y,unsigned char dat);//write lcd a character function LCD_write_char (列,行,'字符')
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s);//write lcd string function LCD_write_string(列,行,"字符串")
void LCD_init(void);//lcd initize function
void delay_nms(unsigned int n);//delay function
void ShowMenu(void);
void Menu_Change(unsigned char KeyNum);
/**************************************************************/
struct MenuItem
{
unsigned char MenuCount; //当前层节点数
unsigned char *DisplayString; //菜单标题
struct MenuItem *ChildrenMenus; //子节点
struct MenuItem *ParentMenus; //父节点
void (*Subs)(); //节点函数
};
/*********************************************************************/
void TimeSet(void)
{
LCD_write_string(0,0,"1.Time Set");
}
void DateSet(void)
{
//put_s("DateSet");
LCD_write_string(0,0,"Date Set");
}
void AlertSet (void)
{
//put_s("AlertSet");
LCD_write_string(0,0,"Alert Set");
}
void NullSubs(void)
{
}
struct MenuItem TimeMenu [4];
struct MenuItem MainMenu [5];
struct MenuItem TimeMenu[4]=
{ // MenuCount DisplayString Subs ChildrenMenus ParentMenus
{4, "1.Time Set", TimeSet, Null, MainMenu},
{4, "2.Date Set", DateSet, Null, MainMenu},
{4, "3.AlertSet", AlertSet, Null, MainMenu},
{4, "4.Back", NullSubs, MainMenu, MainMenu},
};
/*****************************************************************/
//结构体指针,指向结构体后由内部函数指针指向功能函数
struct MenuItem (*MenuPoint) = MainMenu;
unsigned char DisplayStart = 0; //显示时的第一个菜单项
unsigned char UserChoose = 0; //用户所选菜单项
unsigned char DisplayPoint = 0; //显示指针
unsigned MaxItems; //同级最大菜单数
unsigned char ShowCount = 2; //同屏显示菜单数
void ShowMenu(void)
{
unsigned char n;
MaxItems = MenuPoint[0].MenuCount;//定义最大同级菜单
DisplayPoint = DisplayStart;
for(n=0;DisplayPoint<MaxItems&&n<ShowCount;n++)
{
if(DisplayPoint==UserChoose)
LCD_write_string(0,n,"->");
LCD_write_string(2,n,MenuPoint[DisplayPoint++].DisplayString);
}
}
/******************************************************************/
void LCD_en_command(unsigned char command)
{
LCDIO=command;
LCD1602_RS=LOW;
LCD1602_RW=LOW;
LCD1602_EN=LOW;
LCD_delay();
LCD1602_EN=HIGH;
}
/********************************************************************/
void LCD_en_dat(unsigned char dat)
{
LCDIO=dat;
LCD1602_RS=HIGH;
LCD1602_RW=LOW;
LCD1602_EN=LOW;
LCD_delay();
LCD1602_EN=HIGH;
}
/********************************************************************/
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;
LCD_en_command(address);
}
/********************************************************************/
void LCD_write_char( unsigned x,unsigned char y,unsigned char dat)
{
LCD_set_xy( x, y );
LCD_en_dat(dat);
}
/********************************************************************/
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s)
{
LCD_set_xy( X, Y ); //set address
while (*s) // write character
{
LCDIO=*s;
LCD_en_dat(*s);
s ++;
}
}
/********************************************************************/
void LCD_init(void)
{
CLEARSCREEN;//clear screen
LCD_en_command(DATA_MODE);//set 8 bit data transmission mode
LCD_en_command(OPEN_SCREEN);//open display (enable lcd display)
LCD_en_command(DISPLAY_ADDRESS);//set lcd first display address
CLEARSCREEN;//clear screen
}
/*********************** OTHER PART *********************************/
void delay_nms(unsigned int n)
{
unsigned int i=0,j=0;
for (i=n;i>0;i--)
for (j=0;j<1140;j++);
}
/*****************************************************************************/
void Menu_Change(unsigned char KeyNum)
{
//if(KeyNum)
// {
switch(KeyNum)
{
case UP:
UserChoose --;
if (UserChoose ==255)
{
UserChoose = 0;//上翻截至,如果要回滚赋值MaxItems-1
}
break;
case Esc:
if (MenuPoint[UserChoose].ParentMenus != Null)
{
MenuPoint = MenuPoint[UserChoose].ParentMenus;
UserChoose = 0;
DisplayStart = 0;
}
break;
case Down:
UserChoose ++;
if (UserChoose == MaxItems)
{
UserChoose = MaxItems-1;//下翻截至,如要回滚赋值为0
}
break;
case Enter:
if (MenuPoint[UserChoose].Subs != NullSubs)
{
(*MenuPoint[UserChoose].Subs)();
}
else if (MenuPoint[UserChoose].ChildrenMenus != Null)
{
MenuPoint = MenuPoint[UserChoose].ChildrenMenus;
UserChoose = 0;
DisplayStart = 0;
}
break;
default:break;
}
if (UserChoose%ShowCount==0) //一屏只能显示ShowCount行
DisplayStart = UserChoose;
else if(UserChoose==1||UserChoose== 3)
DisplayStart = UserChoose-1; //实现滚屏的关键
LCD_en_command(0x01); //液晶清屏,根据不同液晶函数自行修改
delay_nms(5); //液晶为慢速器件
ShowMenu();
}
//}
/*******************************************************************************************************************************/
void main()
{
LCD_init();
// Init_Menu();
ShowMenu(); //欢迎界面显示
while(1)
{
// Menu_Change(get_key());
}
}
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