avr325.c

avr325用codevisionAvr开发的lcd驱动程序

#include <mega325.h> 
//#include <macros1.h>        
#define xtal 8
/****************************************************
定义管脚名称
*****************************************************/


#define LED_ON  PORTD|= 0x40
#define LED_OFF PORTD&=~0x40

#define RS_ON   PORTD|= 0x80
#define RS_OFF  PORTD&=~0x80

#define RW_ON   PORTG|= 0x01
#define RW_OFF  PORTG&=~0x01

#define E_ON    PORTG|= 0x02
#define E_OFF   PORTG&=~0x02

unsigned char csd;

void delay_39us()    
{                           
   unsigned int i;
   for(i=0;i<300;i++)
   {
      #asm
      nop         
      nop 
      nop 
      nop 
      #endasm
   }
}


void PortIni(void)
{

     PORTB=0xff;
	 PORTD=0xff;
	 PORTC=0xff;
	 PORTG=0xff;
	 
     DDRB=0xff;
     DDRD=0xff;
     DDRC=0xff;
     DDRG=0xff;
}

unsigned char LCD_Busy ( void )
{

unsigned char temp;

E_OFF;	   				

DDRC=0x00;			

RS_OFF;					
RW_ON;					

E_ON;	   				 
#asm
nop
#endasm
temp = PINC;				

E_OFF;	   				
DDRC=0xFF;
return temp;					
}




/*-----------------------------------------------  LCD  ------------------------------------------*/


void Lcd_start(void) 
{


  RS_OFF;
  RW_OFF;
  E_ON;
  PORTC=0x00;
  PORTC=0x30;
  for(csd=0;csd<10;csd++)
  {
      #asm
      nop         
      nop 
      nop 
      nop 
      #endasm
  }
  E_OFF;

  
  delay_39us();
}


/*-------------------------------------------------------*/
/*  ???:       Lce_set                                */
/*  ??  :8?????,1???,5