lcd_twi.c

基于RC500射频卡读写模块的程序设计

/*C**************************************************************************
* NAME:         lcd_twi.c
*----------------------------------------------------------------------------
* Copyright (c) 2003 Atmel.
*----------------------------------------------------------------------------
* RELEASE:      cc03-demo-adc-0_0_1      
* REVISION:     1.16     
*----------------------------------------------------------------------------
* PURPOSE: This file contains the functions to control the LCD.
*****************************************************************************/
/*_____ I N C L U D E S ____________________________________________________*/
#include "config.h"
#include "lcd_twi.h"
#include <string.h>

/*_____ M A C R O S ________________________________________________________*/

/*_____ D E F I N I T I O N S ______________________________________________*/

/*F**************************************************************************
* NAME: lcd_ddram_addr 
*----------------------------------------------------------------------------
* PARAMS:
* uc_line: line number on the LCD 
* return:  uc_address: DDRAM address
*----------------------------------------------------------------------------
* PURPOSE:
* This function returns the DDRAM address corresponding
* to the define line number.  
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE: 
*----------------------------------------------------------------------------
* REQUIREMENTS: 
*****************************************************************************/
Uchar code lcd_ddram_addr[]={0,LCD_LINE_1,LCD_LINE_2,LCD_LINE_3,LCD_LINE_4};

/*_____ D E C L A R A T I O N S ____________________________________________*/
char code sz_blank_line[]=BLANK_LINE;

/*F**************************************************************************
* NAME: lcd_init 
*----------------------------------------------------------------------------
* PARAMS:   none
* return:   none
*----------------------------------------------------------------------------
* PURPOSE:
* Init the LCD 4 bits interface (see algo P46 in HITACHI datasheet)
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE: 
*----------------------------------------------------------------------------
* REQUIREMENTS: 
*****************************************************************************/
bit lcd_init(void)
{ 
tempo(TIMER_40_MS); 
lcd_cmd4_wr(LCD_E_0|LCD_RW_0|LCD_RS_0|LCD_INIT);
tempo(TIMER_5_MS); 
lcd_cmd4_wr(LCD_E_0|LCD_RW_0|LCD_RS_0|LCD_INIT);
tempo(TIMER_1_MS);     
lcd_cmd4_wr(LCD_E_0|LCD_RW_0|LCD_RS_0|LCD_INIT);  
lcd_cmd4_wr(LCD_E_0|LCD_RW_0|LCD_RS_0|LCD_INIT_DL); 
lcd_cmd_wr (LCD_E_0|LCD_RW_0|LCD_RS_0|LCD_4_DATA|LCD_2_LINE|LCD_FONT_5_10);
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_CLR );
tempo(TIMER_5_MS); // clear screen
lcd_cmd_wr (LCD_E_0|LCD_RW_0|LCD_RS_0|LCD_INC|LCD_S_0);
return TRUE;
}



/*F**************************************************************************
* NAME: lcd_cmd_wr 
*----------------------------------------------------------------------------
* PARAMS:
* *para1:   Uchar uc_value
* return:   none
*----------------------------------------------------------------------------
* PURPOSE:
* Send a data value on 8 bits with 2 commands TWI (4 bits mode)
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE: 
*----------------------------------------------------------------------------
* REQUIREMENTS: 
*****************************************************************************/
void lcd_cmd_wr(Uchar value)
{
  Byte uc_msb,uc_lsb;

  /*MSB +LSB in 4 bits mode*/
  uc_msb = (value >> 4);    /* 4 highest bit of value + RS=RW=0 */
  uc_lsb = value & 0x0F;    /* 4 lowest  bit of value + RS=RW=0 */
  twi_putchar(TWI_ADDR_LCD,uc_msb|LCD_E_1|LCD_RW_0|LCD_RS_0); // MSB
  twi_putchar(TWI_ADDR_LCD,uc_msb|LCD_E_0|LCD_RW_0|LCD_RS_0);
  twi_putchar(TWI_ADDR_LCD,uc_lsb|LCD_E_1|LCD_RW_0|LCD_RS_0); // LSB
  twi_putchar(TWI_ADDR_LCD,uc_lsb|LCD_E_0|LCD_RW_0|LCD_RS_0);
} 

/*F**************************************************************************
* NAME: lcd_cmd4_wr 
*----------------------------------------------------------------------------
* PARAMS:
* *para1:   Uchar uc_value
* return:   none
*----------------------------------------------------------------------------
* PURPOSE:
* Send a data value on 4 bits with 1 commands TWI (4 bits mode)
*          Only the LSB part is sent.
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE: 
*----------------------------------------------------------------------------
* REQUIREMENTS: 
*****************************************************************************/
void lcd_cmd4_wr(Uchar uc_value)
{
  uc_value &= 0x0F;
  twi_putchar(TWI_ADDR_LCD,uc_value|LCD_E_1|LCD_RW_0|LCD_RS_0);
  twi_putchar(TWI_ADDR_LCD,uc_value|LCD_E_0|LCD_RW_0|LCD_RS_0);
} 


/*F**************************************************************************
* NAME: lcd_putchar
*----------------------------------------------------------------------------
* PARAMS:
* uc_wr_byte:   byte to write on display
* return:   none
*----------------------------------------------------------------------------
* PURPOSE:
* Write a byte on the display
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE: 
*----------------------------------------------------------------------------
* REQUIREMENTS: 
*****************************************************************************/
void lcd_putchar(Uchar uc_wr_byte)
{
  unsigned char uc_msb, uc_lsb;
  // MSB + LSB in 4 bits mode
  uc_msb = (uc_wr_byte >> 4);       // 4 highest bit of value + RS=RW=0
  uc_lsb = uc_wr_byte & 0x0F;       // 4 lowest  bit of value + RS=RW=0
  twi_putchar(TWI_ADDR_LCD,uc_msb|LCD_E_1|LCD_RW_0|LCD_RS_1); // MSB
  twi_putchar(TWI_ADDR_LCD,uc_msb|LCD_E_0|LCD_RW_0|LCD_RS_1);
  twi_putchar(TWI_ADDR_LCD,uc_lsb|LCD_E_1|LCD_RW_0|LCD_RS_1); // LSB
  twi_putchar(TWI_ADDR_LCD,uc_lsb|LCD_E_0|LCD_RW_0|LCD_RS_1);             
}


/*F**************************************************************************
* NAME: lcd_gotoxy
*----------------------------------------------------------------------------
* PARAMS:
* x: horizontal move 1..x, left to right
* y: vertical move 1..y, top to bottom
* return: none
*----------------------------------------------------------------------------
* PURPOSE:
* Absolute move of virtual cursor: the next lcd_putchar will place the
* character at position x,y.
*----------------------------------------------------------------------------
* EXAMPLE:
* lcd_gotoxy(0,0); // goto home <=> lcd_gotoxy(1,1)
*----------------------------------------------------------------------------
* NOTE: 
* x=0 => beginning of line
*----------------------------------------------------------------------------
* REQUIREMENTS: 
* VT100 compatibility, except if x=0
*****************************************************************************/
void lcd_gotoxy (Byte x, Byte y)
{
if (x) x--;
if (!y) y=1;
lcd_set_ddram(lcd_ddram_addr[y]+x);
}

/*F**************************************************************************
* NAME: lcd_clrscr
*----------------------------------------------------------------------------
* PARAMS:   none
* return:   none
*----------------------------------------------------------------------------
* PURPOSE:
* This function clears the entire display.
* This function uses a controller command.
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE: 
*----------------------------------------------------------------------------
* REQUIREMENTS: 
*****************************************************************************/
void lcd_clrscr (void)
{
lcd_cmd_wr(LCD_E_0|LCD_RW_0|LCD_RS_0|LCD_CLR);
tempo(TIMER_5_MS); // clear screen
}



#ifdef ENABLE_SPLASH_SCREEN
Byte xdata  state_lcd_splash=1;
Uchar xdata uc_buffer_scroll[ROW_LENGTH + 1];


/*F**************************************************************************
* NAME: lcd_splash
*----------------------------------------------------------------------------
* PARAMS:   
* return: TRUE if terminated
*----------------------------------------------------------------------------
* PURPOSE:
* Display the LCD Splash screen
*----------------------------------------------------------------------------
* EXAMPLE:
* while (!lcd_splash());
*----------------------------------------------------------------------------
* REQUIREMENTS: 
* Define ENABLE_SPLASH_SCREEN in config.h to be able to compile the functions
* necessary for lcd_splash
*****************************************************************************/
bit lcd_splash (void)
{
switch(state_lcd_splash)
  {
  case 1 : lcd_scrolling_line(1, "ATMEL",   LCD_SCROLL_INC); break;
  case 2 : lcd_scrolling_line(3, __DATE__ , LCD_SCROLL_DEC); break;
  default: return TRUE;
  }
state_lcd_splash++;
return FALSE;
}


/*F**************************************************************************
* NAME: lcd_wr_str 
*----------------------------------------------------------------------------
* PARAMS:
* uc_line:   Line number on the display (1, 2, 3 or 4)
* *psz: pointer on the string to write
* return:   none
*----------------------------------------------------------------------------
* PURPOSE:
* Send a string on the display.
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE: 
*----------------------------------------------------------------------------
* REQUIREMENTS: 
* Define ENABLE_SPLASH_SCREEN in config.h to use this function
*****************************************************************************/
void lcd_wr_str(Uchar uc_line,Uchar *psz)
{
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);
lcd_ddram_init(uc_line);   
for(;*psz;psz++) lcd_putchar(*psz);  
}

/*F**************************************************************************
* NAME: lcd_scrolling_line
*----------------------------------------------------------------------------
* PARAMS:
* uc_line: line number
* pt_string: string to display and shift
* uc_direction: select a right shift (LCD_SCROLL_INC)or
* a left one LCD_SCROLL_INC.
* return:   none
*----------------------------------------------------------------------------
* PURPOSE: