#include <STC89C5xRC.H>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int 
#define LCD_DB P0
sbit LCD_RS =   P2^4; 
sbit LCD_RW =   P2^3; 
sbit LCD_E  =   P2^2; 
sbit K1 = P1^0;
sbit K2 = P1^1;
sbit K3 = P1^2;
sbit K4 = P1^3;
sbit K5 = P1^4;
sbit M1 = P1^5;
sbit M2 = P1^6;
sbit M3 = P1^7;
sbit DCY1 = P3^0;
sbit DCY2 = P3^1;
sbit CLK = P3^2;
sbit EN = P2^6;
sbit UD = P2^5;
sbit UD1 = P2^1;
uchar bin2dec(uchar a ,uchar b ,uchar c);
uchar bin2dec1(uchar a ,uchar b);
void LCD_init(void);
void LCD_write_command(uchar command);
void LCD_write_date(uchar dat);
void LCD_disp_char(uchar x,uchar y,uchar dat);
void LCD_disp_str(uchar row,uchar * str);
bit LCD_check_busy(void);
void delay_n40us(uint n);
void StartTime0(void);
uchar code dis1[8][9] = {{"DIV:1/2"},{"DIV:1/8"},{"DIV:1/10"},{"DIV:1/16"},{"DIV:1/20"},{"DIV:1/32"},{"DIV:1/40"},{"DIV:1/64"}};
uchar code hz[8] = {1000,1000,1000,1000,1000,1000,1000,1000};
uchar selector = 0;
uchar o = 0,m = 0,s = 0,save = 0,save1 = 0;
void main()
{
    EN = 1;
    CLK = 0;
    StartTime0();
    UD = 0;
    UD1 = 1;
    while(1)
    {
        M1 = K1;
        M2 = K2;
        M3 = K3;
        DCY1 = K4;
        DCY2 = K5;
        o = bin2dec(M1,M2,M3);
        UD1 = 1;
        if(o != save)
        {
            s = 0;
            save = o;
            //selector = o;
            //ET0 = 0;
        }
        else
        {
            s = 1;
            save = o;
            //ET0 = 1;
        }
        m = bin2dec1(DCY2,s);
        if(save1 != m)
        {
             
            switch(m)
            {
                case 0 : 
                {
                    LCD_init();
                    LCD_disp_str(1,dis1[o]);
                    LCD_disp_str(2,"CW:FORWORD");
                    UD1 = 1;
                }
                break;
                case 1 : 
                {
                    LCD_init();
                    LCD_disp_str(1,dis1[o]);
                    LCD_disp_str(2,"CW:FORWORD");
                    UD1 = 1;
                }
                break;
                case 2 : 
                {
                    LCD_init();
                    LCD_disp_str(1,dis1[o]);
                    LCD_disp_str(2,"CW:BACK");
                    UD1 = 0;
                }
                break;
                case 3 : 
                {
                    LCD_init();
                    LCD_disp_str(1,dis1[o]);
                    LCD_disp_str(2,"CW:BACK");
                    UD1 = 0;
                }
                break;
                default :
                {
                    LCD_init();
                    LCD_disp_str(1,dis1[o]);
                }
            }
            save1 = m;
        }
    }
 
}
uchar bin2dec(uchar a ,uchar b ,uchar c)
{
    uchar i;
    a = a<<2;
    b = b<<1;
    i = a | b | c;
    return i;
}
 
uchar bin2dec1(uchar a ,uchar b)
{
    uchar i;
    a = a<<1;
    i = a | b;
    return i;
}
void LCD_init(void)
{
    LCD_write_command(0x38);
    delay_n40us(100);
    LCD_write_command(0x0c);
    delay_n40us(100);
    LCD_write_command(0x06);
    delay_n40us(100);
    LCD_write_command(0x01);
    delay_n40us(100);
}
 
void LCD_write_command(uchar command)
{
    while(LCD_check_busy());
    LCD_RS = 0;
    LCD_RW = 0;
    LCD_E=0;
    _nop_();
  _nop_();
    LCD_DB = command;
    _nop_();
    _nop_();
    _nop_();
    _nop_();
    LCD_E = 1;
    _nop_();
    _nop_();
    _nop_();
    _nop_();
    LCD_E = 0;
}
 
void LCD_write_data(uchar dat)
{
    while(LCD_check_busy());
    LCD_RS = 1;
    LCD_RW = 0;
    LCD_E = 0;
    LCD_DB = dat;
    _nop_();
    _nop_();
    _nop_();
    _nop_();
    LCD_E = 1;
    _nop_();
    _nop_();
    _nop_();
    _nop_();
    LCD_E = 0;
    delay_n40us(1);
}
 
void LCD_disp_char(uchar x,uchar y,uchar dat)
{
    uchar address;
    if(y == 1)
    {
        address = 0x80 + x;
    }
    else
    {
        address = 0xc0 + x;
    }
    LCD_write_command(address);
    LCD_write_data(dat);
}
 
void LCD_disp_str(uchar row,uchar * str)
{
    int i;
    if(row == 1)
    {
        for(i=0;str[i]!='\0';i++)
        {
            LCD_disp_char(i,1,str[i]);
        }
    }
    else
    {
        for(i=0;str[i]!='\0';i++)
        {
            LCD_disp_char(i,2,str[i]);
        }
    }
}
bit LCD_check_busy(void)
{
    bit result;
    LCD_RS = 0;
    LCD_RW = 1;
    LCD_E = 1;
    _nop_();
    _nop_();
    _nop_();
    _nop_();
    delay_n40us(100);
    result = (bit)(LCD_DB & 0x80);
    LCD_E = 0;
    return result;
}
 
void delay_n40us(uint n)
{
    uint i;
    uchar j;
    for(i=n;i>0;i--)
    {
        for(j=0;j<2;j++)
        {
            _nop_();
            _nop_();
        }
    }
}
 
void StartTime0(void)
{
    ET0 = 1;
    TMOD = 0x01;
    TH0 = (65536-1000)/256;
    TL0 = (65536-1000)%256;
    TR0 = 1;
    EA = 1;
}
 
void CLKG(void) interrupt 1
{
    CLK = ~CLK;
    TH0 = (65536-1000)/256;
    TL0 = (65536-1000)%256;
}

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