lcd.c

一款收款机C源代码！因为是几年前的代码了

#include "ecrsys.h"
#include "lcd.h"
#include <string.h>

#define  CMDOFF      0     //Power Off control words
#define  CMDON    	1     //Power On control words
#define  CMDLCDON    3     //ON the LCD display
#define  CMDLCDOFF   2     //OFF the LCD display
#define  CMDB3C4     0x29  //Control Work Mode.

void  LCD_Back(CHR flag)
{
   if (flag == ON)
      LCD_BL = LCD_BL_ON;
   else
      LCD_BL = LCD_BL_OFF;
}

#ifdef LCD_DISP

/*          1        2     3     4     5     6     7     8 */
const CHR   LCD_CHAR_SEG[] = 
      {
         CHAR_MINUS, CHAR_A,  CHAR_b,  CHAR_C,  CHAR_d,  CHAR_E,  CHAR_F,  CHAR_G,
         CHAR_H,     CHAR_1,  CHAR_J,  CHAR_K,  CHAR_L,  CHAR_M,  CHAR_n,  CHAR_O,
         CHAR_P,     CHAR_Q,  CHAR_R,  CHAR_S,  CHAR_t,  CHAR_U,  CHAR_V,  CHAR_W,
         CHAR_X,     CHAR_y,  CHAR_Z
      };

const CHR   LCD_NUM_SEG[] =
      {  
         CHAR_0,  CHAR_1,  CHAR_2,  CHAR_3,  CHAR_4,  CHAR_5,
         CHAR_6,  CHAR_7,  CHAR_8,  CHAR_9,  CHAR_A,  CHAR_b,
         CHAR_C,  CHAR_d,  CHAR_E,  CHAR_F
      };

const CHR   LCD_SECT_SEG[]=
      {
         SECT_NULL,SECT_RA,SECT_PO,SECT_TAIL
      };

volatile byte LCD_Buff[MAX_LCD_NUM];			/* The LCD buffer, store the last display data */

/**********************************************************************************************
*  Send 1 -bit to LCD, and the data in CY register                         
**********************************************************************************************/
void LCD_Send_Out_Bit(CHR send_bit)
{
   if (send_bit != 0)   
      LCD_DI = 1;
   else
      LCD_DI = 0;
   LCD_CLK = 1;
   LCD_CLK = 0;
   LCD_CLK = 1;
}

/******************************************************************************************************
*  Procedure:  Send_Data_LCD
*           :  Send the data which stored in the Special_buf[96] to LCD controller.
*  
*  Input    :  the Display data ( Segment - Digit data)
*  Output   :  None
*
*  Send the Control data to LCD 
******************************************************************************************************/
void Wr_Cntrl_LCD(CHR Cmd)
{
   CHR tmp;

   LCD_EN = 1;
   LCD_EN = 0;
   LCD_Send_Out_Bit(1);
   LCD_Send_Out_Bit(0);
   LCD_Send_Out_Bit(0);
   for (tmp = 0; tmp < 9; tmp ++ )
   {
      if ( (Cmd & 0x80 ) != 0 )
         LCD_Send_Out_Bit(1);
      else
         LCD_Send_Out_Bit(0);
      Cmd <<= 1;
   }
   LCD_DI = 1;
   LCD_EN = 1;
}

/* Send the data to LCD */
void Wr_Data_LCD(CHR Send_Data, CHR Addr)
{
   CHR tmp;

   LCD_EN = 1;          
   LCD_EN = 0;
   LCD_Send_Out_Bit(1);          //CMD for 101
   LCD_Send_Out_Bit(0);
   LCD_Send_Out_Bit(1);
                              //Send the Address first.  
   for (tmp = 0; tmp < 6; tmp ++ )
   {
      if ( ( Addr & 0x20 ) != 0 )
         LCD_Send_Out_Bit(1);
      else
         LCD_Send_Out_Bit(0);
      Addr <<= 1;
   }                          //Send the Data second.
   for (tmp = 0; tmp < 8; tmp ++ )
   {
      if ( ( Send_Data & 0x01 )  != 0 )
         LCD_Send_Out_Bit(1);
      else
         LCD_Send_Out_Bit(0);
      Send_Data >>= 1;
   }
   LCD_DI = 1;
   LCD_EN = 1;
}
/**********************************************************************************************
   Reset the LCD controller chip.
   03-1-15 11:54  by    ZhengXiaoChun
**********************************************************************************************/
void Reset_LCD(void)
{
   Wr_Cntrl_LCD(CMDON);
   Wr_Cntrl_LCD(CMDLCDON);
   Wr_Cntrl_LCD(CMDB3C4);
}

/* Display the data to the LCD, and store the data to the display buffer */
void LCD_Disp(byte data, byte posi)
{
	LCD_Buff[posi] = data;
	Wr_Data_LCD( data, posi * 2 );
}

void LCD_DispChar(byte posi, byte dsp_char, byte dots)
{
    byte tmp;
    
    if(posi >= MAX_LCD_NUM)
        return;
    
    posi = MAX_LCD_NUM - posi - 1;
    if(dsp_char < 16)//数字
    {
        tmp = LCD_NUM_SEG[dsp_char]|dots;
    }
    else if(dsp_char == '-')// '-'
        tmp = LCD_CHAR_SEG[0] | dots;
    else if(dsp_char == ' ') // ' '
          tmp = 0 | dots;
    else if(dsp_char == '.')// '.'
          tmp = 1;
    else if((dsp_char >= '0')&&(dsp_char <= '9'))// '0' ~ '9'
    {
        dsp_char -= '0';
        tmp = LCD_NUM_SEG[dsp_char] | dots;
    }
    else if((dsp_char >= 'a') && (dsp_char <= 'z'))// 'a' ~ 'z'
    {
     dsp_char -= 'a';
     tmp = LCD_CHAR_SEG[dsp_char] | dots;
    }
    else if((dsp_char >= 'A') && (dsp_char <= 'Z'))//'A'~ 'Z'
    {
       dsp_char -= 'A';             //Skip the not used area.
       tmp = LCD_CHAR_SEG[dsp_char] | dots;
    }
    else
        tmp = 0 | dots;
    
     LCD_Disp(tmp,posi);
}

/*--------------------------------------------------------------------------------*
 *                Insert a sect to the LCD display.
 *--------------------------------------------------------------------------------*/
void LCD_Insert_Sect(CHR dsp_data,CHR posi, byte dots)
{
    byte tmp;
    byte i;

    if(posi >= MAX_LCD_NUM)
   	    return;
   
    posi = MAX_LCD_NUM - 1 - posi;
    
    for(i=0;LCD_SECT_SEG[i]!=SECT_TAIL;i++)
      if(LCD_SECT_SEG[i] == dsp_data)
         break;
    if(LCD_SECT_SEG[i] == SECT_TAIL)
        return;
    tmp = LCD_SECT_SEG[i] | dots;

	LCD_Disp(tmp,posi);
}


/*----------------------------------------------------------------------------------------
*  void  LCD_Back(CHAR flag);
*  In:   On / Off the LCD backlight.
*  03-4-2 11:23   by ZhengXC
*---------------------------------------------------------------------------------------*/
void  LCD_Back(CHR flag)
{
   if (flag == ON)
      LCD_BL = LCD_BL_ON;
   else
      LCD_BL = LCD_BL_OFF;
}

void  LCD_Init(void)
{
    byte i;
    
    LCD_EN_DIR    = 1;
    LCD_CLK_DIR   = 1;
    LCD_DI_DIR    = 1;
    LCD_BL_DIR    = 1;
    LCD_Close_Disp();
}


/* Display the data to the LCD, and store the data to the display buffer */

void LCD_InsPeriod(byte posi)
{
    byte tmp;

    if(posi >= MAX_LCD_NUM)
        return;
    
    posi = MAX_LCD_NUM - posi - 1;
    tmp = LCD_Buff[posi];   /* Get the last display data */
    tmp |= 0x01;                /* 0000 0001B, set the flag */
    LCD_Buff[posi] = tmp;
    Wr_Data_LCD( tmp , posi * 2 );
}

void LCD_ClrPeriod(byte posi)
{
    byte tmp;

    if(posi >= MAX_LCD_NUM)
        return;
    
    posi = MAX_LCD_NUM - posi - 1;
    tmp = LCD_Buff[posi];   /* Get the last display data */
    tmp &= 0xfe;                /* 1111 1110B, clear the flag */
    LCD_Buff[posi] = tmp;
    Wr_Data_LCD( tmp , posi * 2 );
}


/*------------------------------------------------------------------------*
					Clear the all display information.
		注意: 推荐不用这个函数, 因为用这个函数比较危险; 因为无法清除VFD的显示. 
 *------------------------------------------------------------------------*/
void LCD_Close_Disp(void)
/* Remain, has't used it in the function */
{
	byte i;

	Reset_LCD();
	for( i = 0; i < MAX_LCD_NUM; i ++)
	{
		LCD_Buff[MAX_LCD_NUM - i - 1] = 0;
		Wr_Data_LCD( 0, (MAX_LCD_NUM - i - 1) * 2 );
	}
}

#endif