lcd_twi.c

基于RC500射频卡读写模块的程序设计

* This function clears the line, diplays a string, and shift
* step by step.
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
* The number of shifts corresponds to the length of the line.
*----------------------------------------------------------------------------
* REQUIREMENTS: 
* Define ENABLE_SPLASH_SCREEN in config.h to use this function
*****************************************************************************/
void lcd_scrolling_line(Uchar uc_line, Uchar * pt_string, Uchar uc_direction)
{
  Uchar uc_len;
  Uchar uc_index;

  lcd_clear_line(uc_line);

  uc_len = strlen(pt_string);

  strcpy(uc_buffer_scroll, pt_string);

  /*display the string*/
  lcd_wr_str(uc_line, pt_string);

  /*fill the buffer after the shift*/
  for(uc_index = uc_len; uc_index < ROW_LENGTH; uc_index++)
  {
      uc_buffer_scroll[uc_index] = 0x20;
  }

  uc_buffer_scroll[ROW_LENGTH] = 0x00;

  /*start the scrolling*/
  if(uc_direction == LCD_SCROLL_INC)
  {
    for(uc_index=0;uc_index< ROW_LENGTH;uc_index++)
    {
      tempo(TIMER_20_MS);

      lcd_scrolling_inc(uc_line);
    }
  }
  else if(uc_direction == LCD_SCROLL_DEC)
  {
    for(uc_index=0;uc_index< ROW_LENGTH;uc_index++)
    {
      tempo(TIMER_20_MS);
      
	  lcd_scrolling_dec(uc_line);
    }
  }
}

/*F**************************************************************************
* NAME: lcd_scrolling_inc 
*----------------------------------------------------------------------------
* PARAMS:  
* uc_line: 
* return:   none
*----------------------------------------------------------------------------
* PURPOSE:
* This function shifts all the line of a character on the right.
* The last character replaces the first one. 
* This function doesn't use the shift controller command.
* The controller manages the dispaly as 2 lines of 40 characters.  
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
* The buffer uc_buffer_scroll[] must contain the string
* to display. The lcd_scrolling_line() function fills the buffer. 
*----------------------------------------------------------------------------
* REQUIREMENTS:
* Define ENABLE_SPLASH_SCREEN in config.h to use this function
*****************************************************************************/
void  lcd_scrolling_inc(Uchar uc_line)
{
  Uchar uc_index; 
  Uchar uc_temp;

  uc_temp = uc_buffer_scroll[ROW_LENGTH - 1]; 

  for(uc_index = (ROW_LENGTH - 1); uc_index >= 1; uc_index--)
  {
    uc_buffer_scroll[uc_index] =   uc_buffer_scroll[uc_index-1]; 
  }

  uc_buffer_scroll[0] = uc_temp; 

  lcd_wr_str(uc_line, uc_buffer_scroll);
}

/*F**************************************************************************
* NAME: lcd_scrolling_dec 
*----------------------------------------------------------------------------
* PARAMS:  
* uc_line: line number
* return:   none
*----------------------------------------------------------------------------
* PURPOSE:
* This function shifts all the line of a character on the left.
* The first character replaces the last one. 
* This function doesn't use the shift controller command.
* The controller manages the dispaly as 2 lines of 40 characters.  
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE: 
* The buffer uc_buffer_scroll[] must contain the string
* to display. The lcd_scrolling_line() function fills the buffer.
*----------------------------------------------------------------------------
* REQUIREMENTS:
* Define ENABLE_SPLASH_SCREEN in config.h to use this function
*****************************************************************************/
void  lcd_scrolling_dec(Uchar uc_line)
{
  Uchar uc_index; 
  Uchar uc_temp;

  uc_temp = uc_buffer_scroll[0]; 

  for(uc_index = 0; uc_index < (ROW_LENGTH - 1); uc_index++)
  {
    uc_buffer_scroll[uc_index] =   uc_buffer_scroll[uc_index+1]; 
  }

  uc_buffer_scroll[ROW_LENGTH -1] = uc_temp; 

  lcd_wr_str(uc_line, uc_buffer_scroll);
}
#endif


#ifdef ENABLE_OLD_LCD_FUNC // Use printf in stdio.h, and modules/custom_io instead of specific funstion
// if you need more performance than printf, write function that manipulate/create strings
// and *NEXT* send this string to output (screen) function.
/*F**************************************************************************
* NAME: lcd_hex_to_ASCII 
*----------------------------------------------------------------------------
* PARAMS:
* uc_data:  data to convert
* return:   result in ASCII
*----------------------------------------------------------------------------
* PURPOSE:
* This function converts a value (0-F) in ASCII byte 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE: 
*----------------------------------------------------------------------------
* REQUIREMENTS: 
* Define ENABLE_OLD_LCD_FUNC in config.h to use this function.
*****************************************************************************/
Uchar lcd_hex_to_ASCII(Uchar uc_data)
{
     if((uc_data >= 0   ) && (uc_data <= 0x09)) return( uc_data + 0x30);
else if((uc_data >= 0x0A) && (uc_data <= 0x0F)) return( uc_data + 0x37);
return 0;
}


/*F**************************************************************************
* NAME: lcd_wr_byte_hex
*----------------------------------------------------------------------------
* PARAMS:
* uc_line: Line number on the display (1, 2, 3 or 4)
* uc_data: data to write (1 byte => 2 ASCII) 00-FF
* return:   none
*----------------------------------------------------------------------------
* PURPOSE:
* Send a byte on the display in hexa (2 characters).
* no line clear 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE: 
*----------------------------------------------------------------------------
* REQUIREMENTS: 
* Define ENABLE_OLD_LCD_FUNC in config.h to use this function.
*****************************************************************************/
void lcd_wr_byte_hex(Uchar uc_line, Uchar uc_byte, Uchar uc_offset)
{
Uchar uc_data_msb;
Uchar uc_data_lsb;
Uchar uc_temp;
Uchar uc_address;

uc_temp = ((0xF0) & uc_byte) >> 4;
uc_data_msb = lcd_hex_to_ASCII(uc_temp);
uc_temp = (0x0F) & uc_byte;
uc_data_lsb = lcd_hex_to_ASCII(uc_temp);
    
lcd_cmd_wr(LCD_E_0|LCD_RW_0|LCD_RS_0|LCD_DISP_ON|LCD_CURS_OFF|LCD_BLINK_OFF);
lcd_cmd_wr(LCD_E_0|LCD_RW_0|LCD_RS_0|LCD_CURS_MOV|LCD_RIGHT_SHIFT);

/* DDRAM init */
uc_address = lcd_ddram_addr[uc_line];

lcd_set_ddram(uc_address + uc_offset);

lcd_putchar(uc_data_msb);
lcd_putchar(uc_data_lsb);
}

/*F**************************************************************************
* NAME: lcd_wr_byte_dec
*----------------------------------------------------------------------------
* PARAMS:
* uc_line: Line number on the display (1, 2, 3 or 4)
* uc_data: data to write (1 byte => 3 ASCII) 0-255
* return:   none
*----------------------------------------------------------------------------
* PURPOSE:
* Send a byte on the display in hexa (2 characters).
* no line cleared 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE: 
*----------------------------------------------------------------------------
* REQUIREMENTS: 
* Define ENABLE_OLD_LCD_FUNC in config.h to use this function.
*****************************************************************************/
void lcd_wr_byte_dec(Uchar uc_line, Uchar uc_byte, Uchar uc_offset)
{
Uchar uc_index2;
Uchar uc_index;
Uchar uc_address;

uc_index = 0;
uc_index2 = 0;

lcd_cmd_wr(LCD_E_0|LCD_RW_0|LCD_RS_0|LCD_DISP_ON|LCD_CURS_OFF|LCD_BLINK_OFF);
lcd_cmd_wr(LCD_E_0|LCD_RW_0|LCD_RS_0|LCD_CURS_MOV|LCD_RIGHT_SHIFT);

/*DDRAM init*/
uc_address = lcd_ddram_addr[uc_line];

lcd_set_ddram(uc_address + uc_offset);

if(uc_byte <= 0x09)
  { /*1 character*/
  lcd_putchar(' ');
  lcd_putchar(' ');
  lcd_putchar(lcd_hex_to_ASCII(uc_byte));
  }
else if((uc_byte >= 0x0A) && (uc_byte <= 0x63))
  {
  while(uc_byte > 0x9)
    {
    uc_byte -= 0x0A;
    uc_index++;
    }
  /*2 characters*/
  lcd_putchar(' ');
  lcd_putchar(lcd_hex_to_ASCII(uc_index));
  lcd_putchar(lcd_hex_to_ASCII(uc_byte));
  }
else if((uc_byte >= 0x64) && (uc_byte <= 0xFF))
  {
  while(uc_byte > 0x9)
    {
    uc_byte -= 0x0A;
    uc_index++;
    }
  while(uc_index > 0x9)
    {
    uc_index -= 0x0A;
    uc_index2++;
    }
  /*3 characters*/
  lcd_putchar(lcd_hex_to_ASCII(uc_index2));
  lcd_putchar(lcd_hex_to_ASCII(uc_index));
  lcd_putchar(lcd_hex_to_ASCII(uc_byte));
  }
}
#endif