charlcd.c

由51单片机制作的电子钟

/*------------------------------------------------------------------

   CharLCD.C (v1.00)   16x2 字符液晶屏驱动程序

------------------------------------------------------------------*/
                    

#include "CharLCD.h"

 

//Change the following section accroding to you hardware
#ifdef _LCDXADDR  
    #define Lcd1602WCmdPort    (*(volatile uchar *)0x2000)  //E=1 RS=0 RW=0
    #define Lcd1602RStatusPort (*(volatile uchar *)0x2001)  //E=1 RS=0 RW=1
    #define Lcd1602WdataPort   (*(volatile uchar *)0x2002)  //E =1 RS=1 RW=0
    #define Lcd1602RDataPort   (*(volatile uchar *)0x2003)  //E=1 RS=1 RW=1 
#else
    #ifdef  _51   
        sbit lcd_cs = P2^0;            //控制位
        sbit lcd_rw = P2^1; 
        sbit lcd_rs = P2^2;
        #define DataPort      P0 
        #define DataDirPort   P0  
        #define StatePort     P0   
    #endif
  
    #ifdef _AVR 
        #define lcd_cs          PORTC.0    //控制位以及其方向控制位
        #define lcd_cs_dir_bit  DDRC.0
        #define lcd_rw          PORTC.1 
        #define lcd_rw_dir_bit  DDRC.1
        #define lcd_rs          PORTC.2
        #define lcd_rs_dir_bit  DDRC.2  
        #define DataPort        PORTA
        #define StatePort       PINA
        #define DataDirPort     DDRA    
    #endif     

#endif 

       
// ------ Private constants ----------------------------------------    

#define Busy 0x80 // 忙判别位  

  
// ------ Private variables-----------------------------------------
#ifdef  _51   
    code uchar* WrtieLcdErr =  "Display char outof range."; 
#endif

#ifdef  _AVR   
    flash uchar* WrtieLcdErr =  "Display char outof range."; 
#endif


// ------ Private function prototypes ------------------------------
static BOOL WaitTillNotBusy();
static BOOL LocateXY(uchar posx,uchar posy); 
static BOOL LcdWData(uchar dataW);
static BOOL LcdWCMD(uchar CMD);
          



          

/*------------------------------------------------------------------

  WaitTillNotBusy()
  检测忙

------------------------------------------------------------------*/
BOOL WaitTillNotBusy()
{ 
    uint delay = 0xffff;  
 
    #ifdef _LCDXADDR 
        while( (Lcd1602RStatusPort & Busy) && delay )
            delay--;
              
        if (!delay)  
            return FALSE;
               
    #else
        #ifdef _AVR         
            DataDirPort = 0x00;              
        #endif   
    
        #ifdef _51    
            DataDirPort = 0xff; 
        #endif  
                          
        lcd_cs = 1;
        lcd_rs = 0;
        lcd_rw = 1;
        while( (StatePort & Busy) && delay)
            delay--;
        lcd_cs = 0;  
        if (!delay)  
            return FALSE ; 
    #endif   
    
    return TRUE; 
}      




/*------------------------------------------------------------------

  LocateXY()
 显示光标定位

------------------------------------------------------------------*/
BOOL LocateXY( uchar posx,uchar posy)
{
    posy &= 0x01;
    if (posy == 1)
        posx |= 0x40;
    posx |= 0x80;
    
    
    return LcdWCMD(posx);   
}


 


/*------------------------------------------------------------------

  LcdWCMD()
 写控制字符子程序: E=1 RS=0 RW=0

------------------------------------------------------------------*/
BOOL LcdWCMD(uchar CMD) 
{        
    #ifdef _LCDXADDR               
        if (!WaitTillNotBusy()) // 检测忙信号? 
            return FALSE;
        Lcd1602WCmdPort = CMD; 
           
    #else 
        uchar i=1;
                            
        if (!WaitTillNotBusy()) // 检测忙信号? 
            return FALSE;    
          
        #ifdef _AVR         
            DataDirPort = 0xff;              
        #endif   
                                 
        DataPort = CMD;
        lcd_rs = 0;
        lcd_rw = 0;
        lcd_cs = 1;
        while(i++);
        lcd_cs = 0;  
    
    #endif
    
    return TRUE;
}

   


/*------------------------------------------------------------------

  LcdWData()
 当前位置写字符子程序: E =1 RS=1 RW=0

------------------------------------------------------------------*/
BOOL LcdWData( uchar dataW ) 
{    
    #ifdef _LCDXADDR  
        if (!WaitTillNotBusy()) // 检测忙信号? 
            return FALSE;
        Lcd1602WdataPort = dataW;
    
    #else       
        uchar i = 1;
         
        if (!WaitTillNotBusy()) // 检测忙信号? 
            return FALSE; 
        
        #ifdef _AVR         
            DataDirPort = 0xff;              
        #endif        
        
        DataPort = dataW;
        lcd_rs = 1;
        lcd_rw = 0;
        lcd_cs = 1;
        while(i++);
        lcd_cs = 0;   
        
    #endif  
    
    return TRUE;
} 
     



/*------------------------------------------------------------------

  LCDInit()
 初始化程序, 必须按照产品资料介绍的初始化过程进行

------------------------------------------------------------------*/
BOOL LCDInit() 
{
    #ifdef _AVR 
        #ifndef _LCDXADDR
            lcd_cs_dir_bit = 1;
            lcd_rw_dir_bit = 1;
            lcd_rs_dir_bit = 1; 
        #endif
    #endif
    
    // 显示模式设置,光标移动设置,显示开及光标设置,显示清屏 
    return (LcdWCMD( 0x38) && LcdWCMD( 0x06) && LcdWCMD( 0x0c) && LcdWCMD( 0x01));       

}
   
    


/*------------------------------------------------------------------

  DisplayOneChar()
 按指定位置显示数出一个字符

------------------------------------------------------------------*/   
BOOL DisplayOneChar(uchar x ,uchar y ,uchar Wdata) 
{
   
    if( (x >= 0 && x < 16) && (y >= 0 && y < 2) )
        return (LocateXY( x, y ) && LcdWData( Wdata )) ;// 定位显示地址,写字符 
    else
        return ( LCDInit() && DisplayString(0, 0, WrtieLcdErr));    //显示越界消息    
}




/*------------------------------------------------------------------

  DisplayString()
 从指定位置开始显示一串字符

------------------------------------------------------------------*/
BOOL DisplayString(uchar posx, uchar posy,  flash uchar*  str)
{    
    while ( (*str) != '\0' )
    {
        if (!DisplayOneChar(posx, posy, (*str)))
            return FALSE;
        str++;
        posx++;
        if( posx == 16 )
        {
            posx = 0;
            posy++;

        }
    }
    
    return TRUE;              
}          


/*------------------------------------------------------------------
  ---- END OF FILE -------------------------------------------------
------------------------------------------------------------------*/