Lesson nr.16-Alphanumeric LCD as counter mode

Hardware setup:
The communication technique with the LCD is the same like the last lesson, and for the current experiment we have added a counter which counts between 0000 and 9999. Our counter increments with 1 second delay.
The connections with LCD is made as follows: D4 with RB0, D5 with RB1, D6 with RB2, D7 with RB3, RS with RB4 and EN with RB5.



Circuit Diagram:
For those who want to build it on their own breadboard or other platform, here is the electronic scheme built in Eagle Cad, free version:

Software:
Here is the C program written for MikroC PRO for PIC 2010 (version v4.15).

/*
'*******************************************************************************
'  Lesson nr.16:
'          Alphanumeric LCD as counter mode.
'  Done by:
'          Aureliu Raducu Macovei, 2010.
'  Description:
'          In this experiment we will work with alphanumeric LCD. Communication
'          with LCD will be performed through 4-bits and connections is made as
'          follows: D4 with RB0, D5 with RB1, D6 with RB2, D7 with RB3;
'                   RS with RB4 and EN with RB5.
'          To make this project more interesting , a counter is added
'          (counts from 0000 to 9999) with a delay of 1 secunde.
'  Test configuration:
'    MCU:                        PIC16F628A
'    Test.Board:                 WB-106 Breadboard 2420 dots
'    SW:                         MikroC PRO for PIC 2010 (version v4.15)
'  Configuration Word
'    Oscillator:                 INTOSC:I/O on RA.6, I/O on RA.7
'    Watchdog Timer:             OFF
'    Power up Timer:             Disabled
'    Master Clear Enable:        Enabled
'    Browun Out Detect:          Enabled
'    Low Voltage Program:        Disabled
'    Data EE Read Protect:       Disabled
'    Code Protect:               OFF
'*******************************************************************************
*/
// LCD module connections
sbit LCD_RS at RB4_bit;                 // LCD_RS assigned to PORT RB4;
sbit LCD_EN at RB5_bit;                 // LCD_EN assigned to PORT RB5;
sbit LCD_D4 at RB0_bit;                 // LCD_D4 assigned to PORT RB0;
sbit LCD_D5 at RB1_bit;                 // LCD_D5 assigned to PORT RB1;
sbit LCD_D6 at RB2_bit;                 // LCD_D6 assigned to PORT RB2;
sbit LCD_D7 at RB3_bit;                 // LCD_D7 assigned to PORT RB3;

sbit LCD_RS_Direction at TRISB4_bit;    // LCD_RS assigned to TRIS B4;
sbit LCD_EN_Direction at TRISB5_bit;    // LCD_EN assigned to TRIS B5;
sbit LCD_D4_Direction at TRISB0_bit;    // LCD_D4 assigned to TRIS B0;
sbit LCD_D5_Direction at TRISB1_bit;    // LCD_D5 assigned to TRIS B1;
sbit LCD_D6_Direction at TRISB2_bit;    // LCD_D6 assigned to TRIS B2;
sbit LCD_D7_Direction at TRISB3_bit;    // LCD_D7 assigned to TRIS B3;
// End LCD module connections

char Message1[]="Counter Mode";         // Message for line1;
unsigned int number = 0;

char *digit = "0000";

void Display_init()   // define display_init;
{                    
 digit[0] = number/1000 + 48;           // thousands digit;
 digit[1] = (number/100)%10 +48;        // hundreds digit;
 digit[2] = (number/10)%10 + 48;        // tens digit;
 digit[3] = number%10 +48;              // unit digit;
 Lcd_Out(2,7,digit);                    // display on LCD from column 2, character 7;
}

void main()                             // main;
{
 CMCON |= 7;                            // turn off analogue comparator and make PORTA to digital I/O;
 Lcd_init();                            // LCD Initialization;
 Lcd_cmd(_LCD_CLEAR);                   // Clear LCD;
 Lcd_cmd(_LCD_CURSOR_OFF);              // Cursor mode, off;
 Lcd_out(1,3,Message1);                 // display message1 from column 1, character 3;

 do{
    display_init();                     // call display_init();
    delay_ms(1000);                     // delay 1s;
    number ++;                          // Increment number;
    if (number > 9999u)                 // if it's more than 9999 go to 0;
    number = 0;
    } while(1);                         // infinite loop;
 }                                      // end.