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2012-12-18T11:37:42Z

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	Na stiahnutie: [[Súbor:lcd.c]]		Na stiahnutie: [[Súbor:lcd.c]]

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StudentDVPS: Vytvorená stránka „ /* * Created: 12/12/2012 12:12:12 * Authors: Lukas Mrva (55716), Vladimir Reksak (55720) */ #include "lcd.h" // ******************************...“

2012-12-18T11:33:33Z

Vytvorená stránka „<source lang="c"> * Created: 12/12/2012 12:12:12 * Authors: Lukas Mrva (55716), Vladimir Reksak (55720): #include "lcd.h" // ******************************...“

Nová stránka

<source lang="c">
/*
* Created: 12/12/2012 12:12:12
* Authors: Lukas Mrva (55716), Vladimir Reksak (55720)
*/

#include "lcd.h"

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

void lcdInit4(void)
{
// Following two lines are a must when using BOOTLOADER:

UCSR0B = 0x00; // Disable RxD and TxD for UART0
// Disable ALL interrupts (Global)
SREG = SREG & 0x7F; // same as cli(); without Interrupts.h

// 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
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
// -------------------
_delay_ms(1); // - wait 0.1ms
// -------------------
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)
_delay_ms(50);
lcdControlWrite(0x0C); // 0x0C - display ON, cursor OFF
lcdControlWrite(0x01); // 0x01 - clear display
lcdControlWrite(0x06); // 0x06 - shift right

}

// ************************************************************
// ********************** 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
}

/* ------------------------------------------------------- */
/* Outputs string to a LCD (at current position) */
/* */
/* ------------------------------------------------------- */

void lcdStringWrite(char* String)
{
register uint8_t i=0;

// check to make sure we have a good pointer
if (!String) return;

// print data
while (String[i])
{
lcdDataWrite(String[i]);
i++;
}
}

/* ------------------------------------------------------- */
/* Read and debounce the LCD AppMod buttons */
/* */
/* Returns 0 if nothing is pressed */
/* Returns 1 if button A is pressed */
/* Returns 2 if button B is pressed */
/* Returns 4 if button C is pressed */
/* Returns 8 if button D is pressed */
/* Returns combination if more is pressed (e.g. 6 for B+C)*/
/* */
/* ------------------------------------------------------- */

unsigned char ReadButtons()
{
DDRD = 0b00001110;
_delay_ms(20);
unsigned char state=(PIND>>4)&0x0F;

DDRD = 0b11111110; // return bus to outputs

// return(state);
return state;
}

/* ------------------------------------------------------- */
/* Test whether LCD is BUSY or READY for next command */
/* */
/* At the moment it is replaced by the fixed time delay */
/* */
/* Return values: 1 - OK */
/* 0 - timeout */
/* ------------------------------------------------------- */

volatile unsigned char t_out_LCD; // timeout displeja (krok 1024 us)
// krok 1ms
unsigned char lcdBusy(void)
{
_delay_ms(1);
return 0;
}

</source>

Na stiahnutie: [[Súbor:lcd.c]]

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StudentDVPS: Vytvorená stránka „ /* * Created: 12/12/2012 12:12:12 * Authors: Lukas Mrva (55716), Vladimir Reksak (55720) */ #include "lcd.h" // ******************************...“