MikroC Tutorial LCD Interafacing

Lcd Library

The mikroC PRO for PIC provides a library for communication with Lcds (with HD44780 compliant controllers) through the 4-bit interface. An example of Lcd connections is given on the schematic at the bottom of this page

Library Routines

*Lcd_Init    

Lcd_Init();    // Initializes Lcd module. LCD pins must be defined before using this routine

*Lcd_Out   

Lcd_Out(1, 3, "Hello!");                     // Prints text on Lcd starting from specified position.

*Lcd_Out_Cp   

Lcd_Out_Cp("Here!");            // Prints text on Lcd at current cursor position.

*Lcd_Chr     

Lcd_Chr(2, 3, 'i');                    // Prints character on Lcd at specified position.

*Lcd_Chr_Cp

Lcd_Chr_Cp('e');                                      // Prints character on Lcd at current cursor position.

*Lcd_Cmd     

Lcd_Cmd(_LCD_CLEAR);                            // Sends command to Lcd.

Available LCD Commands

Lcd Command	Purpose
_LCD_FIRST_ROW	Move cursor to the 1st row
_LCD_SECOND_ROW	Move cursor to the 2nd row
_LCD_THIRD_ROW	Move cursor to the 3rd row
_LCD_FOURTH_ROW	Move cursor to the 4th row
_LCD_CLEAR	Clear display
_LCD_RETURN_HOME	Return cursor to home position, returns a shifted display to its original position. Display data RAM is unaffected.
_LCD_CURSOR_OFF	Turn off cursor
_LCD_UNDERLINE_ON	Underline cursor on
_LCD_BLINK_CURSOR_ON	Blink cursor on
_LCD_MOVE_CURSOR_LEFT	Move cursor left without changing display data RAM
_LCD_MOVE_CURSOR_RIGHT	Move cursor right without changing display data RAM
_LCD_TURN_ON	Turn Lcd display on
_LCD_TURN_OFF	Turn Lcd display off
_LCD_SHIFT_LEFT	Shift display left without changing display data RAM
_LCD_SHIFT_RIGHT	Shift display right without changing display data RAM

 

Library Example

// LCD module connections

sbit LCD_RS at RB4_bit;        sbit LCD_EN at RB5_bit;

sbit LCD_D4 at RB0_bit;        sbit LCD_D5 at RB1_bit;

sbit LCD_D6 at RB2_bit;        sbit LCD_D7 at RB3_bit;

sbit LCD_RS_Direction at TRISB4_bit;  sbit LCD_EN_Direction at TRISB5_bit;

sbit LCD_D4_Direction at TRISB0_bit;  sbit LCD_D5_Direction at TRISB1_bit;

sbit LCD_D6_Direction at TRISB2_bit;  sbit LCD_D7_Direction at TRISB3_bit;

// End LCD module connections

char txt1[] = "mikroElektronika";    

char txt2[] = "EasyPIC6";

char txt3[] = "Lcd4bit";

char txt4[] = "example";

char i;                              // Loop variable

void Move_Delay() {                  // Function used for text moving

  Delay_ms(500);                     // You can change the moving speed here

}

void main(){

  ANSEL  = 0;                        // Configure AN pins as digital I/O

  ANSELH = 0;

  C1ON_bit = 0;                      // Disable comparators

  C2ON_bit = 0;

  Lcd_Init();                        // Initialize LCD

  Lcd_Cmd(_LCD_CLEAR);               // Clear display

  Lcd_Cmd(_LCD_CURSOR_OFF);          // Cursor off

  Lcd_Out(1,6,txt3);                 // Write text in first row

  Lcd_Out(2,6,txt4);                 // Write text in second row

  Delay_ms(2000);

  Lcd_Cmd(_LCD_CLEAR);               // Clear display

  Lcd_Out(1,1,txt1);                 // Write text in first row

  Lcd_Out(2,5,txt2);                 // Write text in second row

  Delay_ms(2000);

  // Moving text

  for(i=0; i<4; i++) {               // Move text to the right 4 times

    Lcd_Cmd(_LCD_SHIFT_RIGHT);

    Move_Delay();

  }

  while(1) {                         // Endless loop

    for(i=0; i<8; i++) {             // Move text to the left 7 times

      Lcd_Cmd(_LCD_SHIFT_LEFT);

      Move_Delay();

    }

    for(i=0; i<8; i++) {             // Move text to the right 7 times

      Lcd_Cmd(_LCD_SHIFT_RIGHT);

      Move_Delay();

    }

  }

}