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Nová stránka: #include "lcd.h" // *********************************************************** // ******************** PUBLIC FUNCTIONS ********************* // **********************************...
 
Balogh (diskusia | príspevky)
Bez shrnutí editace
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<source lang="c">
#include "lcd.h"
#include "lcd.h"


Riadok 227: Riadok 228:
   }
   }
}
}
</source>

Verzia z 11:44, 4. október 2010

#include "lcd.h"


// ***********************************************************
// ******************** PUBLIC FUNCTIONS *********************
// ***********************************************************

void lcdInit4(void)
{ 	                                        // initialize LCD control & data 
										    // lines to output

	PORTD = 0b00000001;						// pull-up on unused input 
	DDRD  = 0b11111110;						// set ctrl & data as outputs 

	delay_ms(50);        					// -  wait 15ms or more
											// -------------------
	CLEARBIT(PORTD, LCD_CTRL_RS);			// set RS to "control"
	CLEARBIT(PORTD, LCD_CTRL_RW);			// set R/W to "write"
											// 4 bit write
	SETBIT(PORTD, LCD_CTRL_E);			    // set "E" line
//	PORTD = (PORTD | 0x30) & 0x3F;          // output data, high 4 bits
	PORTD = (PORTD | 0x20) & 0x2F;          // output data, high 4 bits
	LCD_DELAY;							    // wait
	CLEARBIT(PORTD, LCD_CTRL_E);			// clear "E" line	
											// -------------------
	delay_ms(5); 				            // -  wait 4.1ms
	SETBIT(PORTD, LCD_CTRL_E);	 	        // set "E" line
	LCD_DELAY;								// wait
	CLEARBIT(PORTD, LCD_CTRL_E);			// clear "E" line	
											// -------------------
    delay_ms(1);	                        // -  wait 0.1ms
	SETBIT(PORTD, LCD_CTRL_E);			    // set "E" line
	LCD_DELAY;						        // wait
	CLEARBIT(PORTD, LCD_CTRL_E);			// clear "E" line
											// -------------------   
	while(lcdBusy()) /* wait */ ;           // check for not busy
    										// -------------------
	PORTD = (PORTD | 0x20) & 0x2F;	        // output data, high 4 bits
	SETBIT(PORTD, LCD_CTRL_E);		        // set "E" line
	LCD_DELAY;								// wait
	CLEARBIT(PORTD, LCD_CTRL_E);		    // clear "E" line
											// -------------------
	lcdControlWrite(0x28);					// 0x28	- function set (2 rows, 5x8 font)
	lcdControlWrite(0x08);					// 0x08	- display OFF
	lcdControlWrite(0x01);					// 0x01 - clear display 
	lcdControlWrite(0x06); 					// 0x06 - shift right
	lcdControlWrite(0x0C); 					// 0x0C - display ON, cursor OFF	
	
}


// ************************************************************
// ********************** LOCAL FUNCTIONS *********************
// ************************************************************


void lcdControlWrite(unsigned char c_data)  // write the CONTROL byte to the display controller
{
	while(lcdBusy()) /* wait here */ ;		// wait until LCD not busy  or timeout
	
	CLEARBIT(PORTD, LCD_CTRL_RS);		    // set RS to "control"
	CLEARBIT(PORTD, LCD_CTRL_RW);	    	// set R/W to "write"	
	
	PORTD = (PORTD&0x0F)|(c_data&0xF0);	    // output data, high 4 bits
	SETBIT(PORTD, LCD_CTRL_E);		        // set "E" line
	LCD_DELAY;								// wait
	CLEARBIT(PORTD, LCD_CTRL_E);	        // clear "E" line

	PORTD = (PORTD&0x0F) | (c_data<<4);	    // output data, low 4 bits
	SETBIT(PORTD, LCD_CTRL_E);		        // set "E" line
	LCD_DELAY;								// wait
	CLEARBIT(PORTD, LCD_CTRL_E);	        // clear "E" line			
}


void lcdDataWrite(unsigned char w_data)     // write a DATA byte to the display
{
	while(lcdBusy())	 /* wait */ ;		// wait until LCD not busy or timeout
		
	SETBIT(PORTD, LCD_CTRL_RS);		        // set RS to "data"
	CLEARBIT(PORTD, LCD_CTRL_RW);		    // set R/W to "write"
		
	PORTD = (PORTD&0x0F) | (w_data&0xF0);	// output data, high 4 bits
	SETBIT(PORTD, LCD_CTRL_E);	            // set "E" line
	LCD_DELAY;								// wait
	CLEARBIT(PORTD, LCD_CTRL_E);		    // clear "E" line
	
	PORTD = (PORTD&0x0F) | (w_data<<4);	    // output data, low 4 bits
	SETBIT(PORTD, LCD_CTRL_E);		        // set "E" line
	LCD_DELAY;								// wait
	CLEARBIT(PORTD, LCD_CTRL_E);		    // clear "E" line	
}



// ak vrati 1, OK
// ak vrati 0, vyprsal timeout

volatile unsigned char t_out_LCD; 		// timeout displeja (krok 1024 us) 
//																krok 1ms
unsigned char lcdBusy(void)
{	

   delay_ms(10);
   return 0;
/*
unsigned char pom;
	t_out_LCD=4; // pockam cca 4ms
	// wait until LCD busy bit goes to zero
	// do a read from control register
	CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_RS);				// set RS to "control"
	
	LCD_DATA_PORT |=  0xF0;	// set pull-ups to on (4bit)
	LCD_DATA_DDR  &=  0x0F;	// set data I/O lines to input (4bit)
	
	SETBIT(LCD_CTRL_PORT, LCD_CTRL_RW);				// set R/W to "read"
	SETBIT(LCD_CTRL_PORT, LCD_CTRL_E);				// set "E" line
	LCD_DELAY;										// wait
	pom= LCD_DATA_PIN&0xF0;		// input data, high 4 bits
	CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E);		// clear "E" line
	LCD_DELAY;										// wait
	SETBIT(LCD_CTRL_PORT, LCD_CTRL_E);				// set "E" line
	LCD_DELAY;										// wait
	pom|=(LCD_DATA_PIN>>4)&0x0F;		// input data, low 4 bits
	CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E);		// clear "E" line
	
	while ((pom & (1<<LCD_BUSY))  && t_out_LCD )
	{
		SETBIT(LCD_CTRL_PORT, LCD_CTRL_E);				// set "E" line
		LCD_DELAY;										// wait
		pom=LCD_DATA_PIN&0xF0;		// input data, high 4 bits
		CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E);		// clear "E" line
		LCD_DELAY;										// wait
		SETBIT(LCD_CTRL_PORT, LCD_CTRL_E);				// set "E" line
		LCD_DELAY;										// wait
		pom|=(LCD_DATA_PIN>>4)&0x0F;		// input data, low 4 bits
		CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E);		// clear "E" line	
	}
	
	//	leave data lines in input mode so they can be most easily used for other purposes	
	if(t_out_LCD)
		return 1;	// ak vrati 1 timeout OK 
	else 
		return 0;		// ak vrati 0 timeout notOK
*/

}



/*
unsigned char lcdControlRead(void)
{
	// read the control byte from the display controller
	register unsigned char r_data=0;

	if(lcdBusyWait())	// wait until LCD not busy or time out
	{	
		outb(LCD_DATA_PORT, inb(LCD_DATA_PORT)|0xF0);	// set pull-ups to on (4bit)
		outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&0x0F);	// set data I/O lines to input (4bit)
		CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_RS);				// set RS to "control"
		SETBIT(LCD_CTRL_PORT, LCD_CTRL_RW);				// set R/W to "read"
		
		SETBIT(LCD_CTRL_PORT, LCD_CTRL_E);	// set "E" line
		LCD_DELAY;							// wait
		r_data = inb(LCD_DATA_PIN)&0xF0;		// input data, high 4 bits
		CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E);	// clear "E" line
		LCD_DELAY;							// wait
		SETBIT(LCD_CTRL_PORT, LCD_CTRL_E);	// set "E" line
		LCD_DELAY;							// wait
		r_data |= inb(LCD_DATA_PIN)>>4;		// input data, low 4 bits
		CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E);	// clear "E" line
		
		//	leave data lines in input mode so they can be most easily used for other purposes
	}	
	return r_data;
}

unsigned char lcdDataRead(void)
{
// read a data byte from the display
	register unsigned char r_data =0;

	if(lcdBusyWait())				// wait until LCD not busy or time out
	{			
		outb(LCD_DATA_PORT, inb(LCD_DATA_PORT)|0xF0);	// set pull-ups to on (4bit)
		outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&0x0F);	// set data I/O lines to input (4bit)
		SETBIT(LCD_CTRL_PORT, LCD_CTRL_RS);				// set RS to "data"
		SETBIT(LCD_CTRL_PORT, LCD_CTRL_RW);				// set R/W to "read"
		
		SETBIT(LCD_CTRL_PORT, LCD_CTRL_E);	// set "E" line
		LCD_DELAY;							// wait
		r_data = inb(LCD_DATA_PIN)&0xF0;		// input data, high 4 bits
		CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E);	// clear "E" line
		LCD_DELAY;							// wait
		SETBIT(LCD_CTRL_PORT, LCD_CTRL_E);	// set "E" line
		LCD_DELAY;							// wait
		r_data |= inb(LCD_DATA_PIN)>>4;		// input data, low 4 bits
		CLEARBIT(LCD_CTRL_PORT, LCD_CTRL_E);	// clear "E" line
		
	}	
	//	leave data lines in input mode so they can be most easily used for other purposes
	return r_data;
}





*/

void delay_ms(unsigned int ms)
{
  unsigned int index;

  while (ms)
  {
   index = F_CPU / 5000;    // vypocitajte, kolko treba, aby sme dostali 1ms!!
        
   while (index)
   {
    asm volatile ("nop");
    index--;
   }

   ms--;
  }
}