单片机+LCD1602多菜单没显示求帮助！ -

#include<reg52.h>
#include<intrins.h>
#define uchar unsigned char
unsigned char code digit[10]={"0123456789"};
unsigned char code tab0[]={"TimeSet"};
unsigned char code tab1[]={"DateSet"};
unsigned char code tab2[]={"AlertSet"};
//unsigned char code tab3[]={"TimeSet"};
sbit RS = P2^5;
sbit RW = P2^6;
sbit EN = P2^7;
#define DataPort P0
void DelayUs2x(unsigned char t)
{
while(--t);
}
void DelayMs(unsigned char t)
{
while(t--)
{
DelayUs2x(245);
DelayUs2x(245);
}
}
unsigned char LCD_Wait(void)
{
RS=0;
RW=1;
_nop_();
EN=1;
_nop_();
EN=0;
return DataPort;
}
void LCD_Write_Com(unsigned char com)
{
RS=0;
RW=0;
nop_();
EN=1;
DataPort= com;
_nop_();
EN=0;
LCD_Wait();
}
void LCD_Write_Data(unsigned char Data)
{
RS=1;
RW=0;
nop_();
EN=1;
DataPort= Data;
_nop_();
EN=0;
LCD_Wait();
}
void LCD_Clear(void)
{
LCD_Write_Com(0x01);
DelayMs(5);
}
void LCD_Write_String(unsigned char x,unsigned char y,unsigned char *s)
{
if (y == 0)
{
LCD_Write_Com(0x80 + x);
}
else
{
LCD_Write_Com(0xC0 + x);
}
while (*s)
{
LCD_Write_Data( *s);
s ++;
}
}
void LCD_Write_Char(unsigned char x,unsigned char y,unsigned char Data)
{
if (y == 0)
{
LCD_Write_Com(0x80 + x);
}
else
{
LCD_Write_Com(0xC0 + x);
}
LCD_Write_Data( Data);
}
void LCD_Init(void)
{
LCD_Write_Com(0x38);
DelayMs(5);
LCD_Write_Com(0x38);
DelayMs(5);
LCD_Write_Com(0x38);
DelayMs(5);
LCD_Write_Com(0x38);
LCD_Write_Com(0x08);
DelayMs(5);
LCD_Write_Com(0x01);
DelayMs(5);
LCD_Write_Com(0x06);
DelayMs(5);
LCD_Write_Com(0x0C);
DelayMs(5);
}
#define Null 0
//***********************
//* oˉêyéùÃ÷ *
//***********************/
unsigned char KeyScan(void);
void ShowMenu(void);
void Menu_Change(unsigned char KeyNum);
#define KeyPort P3
//**********************
//* Ä¿Â¼½á11ìå¶¨òå *
//**********************/
struct MenuItem
{
unsigned char MenuCount;
unsigned char *DisplayString;
void (*Subs)();
struct MenuItem *ChildrenMenus;
struct MenuItem *ParentMenus;
};
void NullSubs(void)
{
}
void TimeSet(void)
{
uchar i;
i=0;
LCD_Write_Com(0x02);
while(tab0[i]!='\0')
{
LCD_Write_Data(tab0[i++]);
i++;
}
}
void DateSet(void)
{
uchar i;
i=0;
LCD_Write_Com(0x42);
while(tab1[i]!='\0')
{
LCD_Write_Data(tab1[i++]);
i++;
}
}
void AlertSet (void)
{
uchar i;
i=0;
LCD_Write_Com(0x02);
while(tab2[i]!='\0')
{
LCD_Write_Data(tab2[i++]);
i++;
}
}
//------------------------------------------------------------------------------
struct MenuItem TimeMenu[4];
struct MenuItem FlashMenu[5];
struct MenuItem VoiceMenu[5];
struct MenuItem RobotMenu[5];
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},
};
struct MenuItem FlashMenu[5]=
{ //MenuCount DisplayString Subs ChildrenMenus ParentMenus
{5, "1.Flash Record", NullSubs, Null, MainMenu},
{5, "2.Play", NullSubs, Null, MainMenu},
{5, "3.Pause", NullSubs, Null, MainMenu},
{5, "4.Flash Delete", NullSubs, Null, MainMenu},
{5, "5.Back", NullSubs, MainMenu, MainMenu},
};
struct MenuItem VoiceMenu[5]=
{ //MenuCount DisplayString Subs ChildrenMenus ParentMenus
{5, "1.Voice Record" , NullSubs, Null, MainMenu},
{5, "2.Play", NullSubs, Null, MainMenu},
{5, "3.Pause", NullSubs, Null, MainMenu},
{5, "4.Voice Delete", NullSubs, Null, MainMenu},
{5, "5.Back", NullSubs, MainMenu, MainMenu},
};
struct MenuItem RobotMenu[5]=
{ //MenuCount DisplayString Subs ChildrenMenus ParentMenus
{5, "1.Turn Left", NullSubs, Null, MainMenu},
{5, "2.Turn Right", NullSubs, Null, MainMenu},
{5, "3.Go Ahead", NullSubs, Null, MainMenu},
{5, "4.Go Back", NullSubs, Null, MainMenu},
{5, "5.Back", NullSubs, MainMenu, MainMenu},
};
struct MenuItem MainMenu[5]=
{ //MenuCount DisplayString Subs ChildrenMenus ParentMenus
{5, "1.Time Set" , NullSubs, TimeMenu, Null},
{5, "2.Voice Center", NullSubs, VoiceMenu, Null},
{5, "3.Robot Control", NullSubs, RobotMenu, Null},
{5, "4.Flash Option", NullSubs, FlashMenu, Null},
{5, "5.Back", NullSubs, MainMenu, MainMenu},
};
//------------------------------------------------------------------------------
struct MenuItem (*MenuPoint) = MainMenu;
unsigned char DisplayStart = 0;
unsigned char UserChoose = 0;
unsigned char DisplayPoint = 0;
unsigned MaxItems;
unsigned char ShowCount=2;
/***********************
*ÏÔê¾oˉêyÇø *
***********************/
void ShowMenu(void)
{
unsigned char n;
MaxItems = MenuPoint[0].MenuCount;
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);
}
}
unsigned char KeyScan(void)
{
unsigned char keyvalue;
if(KeyPort!=0xff)
{
DelayMs(10);
if(KeyPort!=0xff)
{
keyvalue=KeyPort;
while(KeyPort!=0xff);
switch(keyvalue)
{
case 0xfe:return 1;break;
case 0xfd:return 2;break;
case 0xfb:return 3;break;
case 0xf7:return 4;break;
case 0xef:return 5;break;
case 0xdf:return 6;break;
case 0xbf:return 7;break;
case 0x7f:return 8;break;
default:return 0;break;
}
}
}
return 0;
}
void Menu_Change(unsigned char KeyNum)
{
KeyNum=KeyScan();
if(KeyNum)
{
switch(KeyNum)
{
case 1:
UserChoose --;
if (UserChoose ==255)
{
UserChoose = 0;
}
break;
case 2:
if (MenuPoint[UserChoose].ParentMenus != Null)
{
MenuPoint = MenuPoint[UserChoose].ParentMenus;
UserChoose = 0;
DisplayStart = 0;
}
break;
case 3:
UserChoose ++;
if (UserChoose == MaxItems)
{
UserChoose = MaxItems-1;
}
break;
case 4:
if (MenuPoint[UserChoose].Subs != NullSubs)
{
(*MenuPoint[UserChoose].Subs)();
}
else if (MenuPoint[UserChoose].ChildrenMenus != Null)
{
MenuPoint = MenuPoint[UserChoose].ChildrenMenus;
UserChoose = 0;
DisplayStart = 0;
}
break;
case 5:
MenuPoint = MainMenu;
UserChoose = 0;
DisplayStart = 0;
break;
default:break;
}
if (UserChoose%ShowCount==0)
DisplayStart = UserChoose;
else if(UserChoose==1||UserChoose== 3)
DisplayStart = UserChoose-1;
LCD_Write_Com(0x01);
DelayMs(5);
ShowMenu();
}
}
void main(void)
{
LCD_Init();
ShowMenu();
while(1)
{
Menu_Change(KeyScan());
}
}

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