Re: [問題] 8051使用C語言LCD顯示問題

[Magicx (菊花普洱茶)]

//        LCD
unsigned char NowPos=0;                //for postion adjust
sfr                LCD_DATA         = 0x80;//connect to P0
sbit         LCD_E                 = P3^7;
sbit         LCD_RW                 = P3^6;
sbit        LCD_RS                 = P3^5;
// RS = 0 instr reg, RS = 1 data reg

#define LCD_CLS()        WriteLCDCmd(0x1);
#define LCD_HOME()        WriteLCDCmd(0x2);

unsigned char ReadLCD()
{
        unsigned char tmp;
        LCD_RS = 0;
        LCD_RW = 1;
        LCD_E = 1;
        tmp = LCD_DATA;
        LCD_E = 0;
        LCD_RW = 1;
        LCD_RS = 1;
        return tmp;
}

unsigned char CheckLCDBusy()
{
        unsigned char tmp;
        tmp = ReadLCD();
        return (tmp & 0x80);
}

void WriteLCDCmd(unsigned char cmd)
{
        while ( CheckLCDBusy() );
        LCD_RS = 0;
        LCD_RW = 0;
        LCD_E = 1;
        LCD_DATA = cmd;
        LCD_E = 0;
        LCD_RW = 1;
        LCD_RS = 1;

}

void LCD_SetPos(unsigned char pos)
{
        NowPos=pos;
        //read pos to NowPos
        WriteLCDCmd(pos | 0x80);
}

void WriteLCDData(unsigned char dat)
{
        if(NowPos > 0x4F)                                                //from
last jump to first
                LCD_SetPos(0x0);

        if( (NowPos > 0x0F) && (NowPos<40) )
//from upper last jump to lower first

                LCD_SetPos(0x40);

        while ( CheckLCDBusy() );
        LCD_RS = 1;
        LCD_RW = 0;
        LCD_E = 1;
        LCD_DATA = dat;
        LCD_E = 0;
        LCD_RW = 1;
        LCD_RS = 1;
        NowPos++;
        //NowPos increse
}

void LCD_Init()
{
        WriteLCDCmd(0x38);                //Function Set
        WriteLCDCmd(0xe);                //Display On/Off control
        WriteLCDCmd(0x6);                //Entry Mode Set
}

void LCD_Print(char *s)                                                //Print S
tring
{
        while ( *s )
        {
                WriteLCDData(*s);
                s++;
        }
}



LCD_SetPos是可以設定游標的函式..

參考看囉!^^

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