超规范：Pic18f452 4位数据1602lcd驱动程序

min

c语言，学长写的，很是崇拜啊！mplab的c语言！

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#include <p18f452.h>
#include <delays.h>

#define CPU_SPEED  16    // CPU speed is 16 Mhz !!
#define LCD_RS   PORTDbits.RD4 // The definition of control pins
#define LCD_RW   PORTDbits.RD5
#define LCD_E   PORTAbits.RA2
#define LCD_DATA  LATD   // PORTD[0:3] as LCD DB[4:7]
#define DIR_LCD_DATA TRISD

//  LCD Module commands
#define DISP_2Line_8Bit 0b00111000
#define DISP_2Line_4Bit 0b00101000
#define DISP_ON   0x00C  // Display on
#define DISP_ON_C  0x00E  // Display on, Cursor on
#define DISP_ON_B  0x00F  // Display on, Cursor on, Blink cursor
#define DISP_OFF  0x008  // Display off
#define CLR_DISP  0x001  // Clear the Display
#define ENTRY_INC  0x006  //
#define ENTRY_INC_S  0x007  //
#define ENTRY_DEC  0x004  //
#define ENTRY_DEC_S  0x005  //
#define DD_RAM_ADDR  0x080  // Least Significant 7-bit are for address
#define DD_RAM_UL  0x080  // Upper Left coner of the Display

unsigned char  Temp_CMD ;
unsigned char  Str_Temp ;
unsigned char Out_Mask ;
void LCD_Set_Cursor(unsigned char CurY, unsigned char CurX);
void LCD_L_Delay(void)   ;  
void LCD_S_Delay(void)   ;
void WriteCmdLCD(unsigned char LCD_CMD)  ;
void WriteDataLCD( unsigned char LCD_CMD) ;
void LCD_CMD_W_Timing( void ) ;
void LCD_DAT_W_Timing( void ) ;
void main (void);
void main (void){
//对LCD进行初始化**********************************************************************
char flag=1;
char c1='I';
char c2=' ';
char c3='a';
char c4='m';
char c5=' ';
char c6='s';
char c7='!';

TRISBbits.TRISB0=1;
LCD_E=0;         

LCD_DATA = 0x00;     // LCD DB[4:7] & RS & R/W --> Low
DIR_LCD_DATA = 0x00;    // LCD DB[4:7} & RS & R/W are output function
TRISAbits.TRISA2=0;     // Set E pin as output
LCD_DATA = 0b00000011 ;
LCD_CMD_W_Timing() ;
LCD_L_Delay() ;
// LCD_DATA = 0b00000011 ;
// LCD_CMD_W_Timing() ;
// LCD_L_Delay() ;
// LCD_DATA = 0b00000011 ;
// LCD_CMD_W_Timing() ;
// LCD_L_Delay() ;
// LCD_DATA = 0b00000010 ;
// LCD_CMD_W_Timing() ;
// LCD_L_Delay() ;
WriteCmdLCD(DISP_2Line_4Bit) ;
LCD_S_Delay() ;
WriteCmdLCD(DISP_ON) ;
LCD_S_Delay() ;
WriteCmdLCD(ENTRY_INC) ;
LCD_S_Delay() ;
WriteCmdLCD(CLR_DISP);
LCD_L_Delay() ;
    LCD_Set_Cursor(0,5);
//**********************************************
   
   

      WriteDataLCD(c1);
   
      WriteDataLCD(c2);
      WriteDataLCD(c3);
      WriteDataLCD(c4);
      WriteDataLCD(c5);
      WriteDataLCD(c6);
      WriteDataLCD(c7);   
   
Nop();   
   while(1)
{
if(PORTBbits.RB0==1)
{
flag=1;
   
}
else
{
if(flag==1)
{

  WriteCmdLCD(DISP_ON) ;
LCD_S_Delay() ;
WriteCmdLCD(ENTRY_INC) ;
LCD_S_Delay() ;
WriteCmdLCD(CLR_DISP);
LCD_L_Delay() ;
    LCD_Set_Cursor(1,5);

   WriteDataLCD(c1);
   
      WriteDataLCD(c2);
      WriteDataLCD(c3);
      WriteDataLCD(c4);
      WriteDataLCD(c5);
      WriteDataLCD(c6);
      WriteDataLCD(c7);   
}
flag=flag+1;
}
}

}
   
//*********************************************
//     _    ______________________________
// RS  _>--<______________________________
//     _____
// RW       \_____________________________
//                  __________________
// E   ____________/                  \___
//     _____________                ______
// DB  _____________>--------------<______
//***********************************************
// Write Command to LCD module
//
void WriteCmdLCD( unsigned char LCD_CMD)
{
Temp_CMD = (LCD_CMD & 0xF0)>>4 ;   // Send high nibble to LCD bus
LCD_DATA= (LCD_DATA & 0xF0)|Temp_CMD ;
LCD_CMD_W_Timing () ;
Temp_CMD = LCD_CMD & 0x0F ;    // Send low nibble to LCD bus
LCD_DATA= (LCD_DATA & 0xF0)|Temp_CMD ;
LCD_CMD_W_Timing () ;
LCD_S_Delay() ;       // Delay 100uS for execution
}
//***********************************************
// Write Data to LCD module
//
void WriteDataLCD( unsigned char LCD_CMD)
{

Temp_CMD = (LCD_CMD & 0xF0)>>4 ;   // Send high nibble to LCD bus
LCD_DATA= (LCD_DATA & 0xF0)|Temp_CMD ;
LCD_DAT_W_Timing () ;
Temp_CMD = LCD_CMD & 0x0F ;    // Send low nibble to LCD bus
LCD_DATA= (LCD_DATA & 0xF0)|Temp_CMD ;
LCD_DAT_W_Timing () ;
LCD_S_Delay() ;       // Delay 100uS for execution
}


void LCD_CMD_W_Timing( void )
{
LCD_RS = 0 ; // Set for Command Input
Nop();
LCD_RW = 0 ;
Nop();
LCD_E = 1 ;
Nop();
Nop();
LCD_E = 0 ;
}
void LCD_DAT_W_Timing( void )
{
LCD_RS = 1 ; // Set for Data Input
Nop();
LCD_RW = 0 ;
Nop();
LCD_E = 1 ;
Nop();
Nop();
LCD_E = 0 ;
}
//***********************************************
//     Set Cursor position on LCD module
//   CurY = Line (0 or 1)
//       CurX = Position ( 0 to 15)
//
void LCD_Set_Cursor(unsigned char CurY, unsigned char CurX)
{
WriteCmdLCD( 0x80 + CurY * 0x40 + CurX) ;
LCD_S_Delay() ;
}


// *********************************************************************************
// Delay for atleast 10 ms
// *********************************************************************************
void LCD_L_Delay(void)
{
  Delay10KTCYx( 8);
}
// *********************************************************************************
// Delay for 100 us
// *********************************************************************************
void LCD_S_Delay(void)
{
  Delay100TCYx( 16 );
}