[SOLVED] PIC 16F877 interface with LCD 2 x 16

[WStevens_sa]

Hi all

Trying to figure out how to send info to LCD 2x16. Running a bit into a snag. The code below I found on the web. I am trying to understand the methods of communication with an LCD using f877. I am using Real Pic Simulator 1.3 to simulate.

First problem On compiling "MikroC"
8 393 'lcd_cmd' Identifier redefined LCD 2 x 6.c

Second problem I cannot Identify which pins from the f877 go to where on the LCD. I have a feeling that the pins are already configured somewhere else and this is why it complains about the "Identifier redefined"

int k;
char ch;

void delay_ms()
{
for(k=0;k<100;k++);
}
void lcd_cmd(ch)
{
PORTD=ch; //sending character element on port
PORTC=0x04;
delay_ms(100); //to wait for character to write on lcd
PORTC=0x00;
}
void lcd_data(char ch)
{
PORTD=ch;
PORTC=0x05;
delay_ms(100);
PORTC=0x01;
}
void init_lcd()
{
lcd_cmd(0x3); // function set (set interface length)
lcd_cmd(0x0E); //enable cursor display
//lcd_cmd(0x01); //clear display
//lcd_cmd(0x06); //entry mode set
//lcd_cmd(0x1C); //move cursor

}

void main(void)
{
char str[] = "Welcome";
int len;
int i;
TRISC=0;
TRISD=0;
init_lcd();

len=sizeof(str);
for( i=0;i<=len;i++) //for sending commands character by character
{
lcd_data(str);
}
lcd_cmd(0x0c);
lcd_cmd(0x02);
}

 

[Denshil]

Hi all

Trying to figure out how to send info to LCD 2x16. ...................................
First problem On compiling "MikroC"
8 393 'lcd_cmd' Identifier redefined LCD 2 x 6.c

Second problem I cannot Identify which pins from the f877 go to where on the LCD. I have a feeling that the pins are already configured somewhere else and this is why it complains about the "Identifier redefined"

I think problem … built in functions you are redefined.


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;

void main(){
Lcd_Init();
Lcd_Cmd(_LCD_CLEAR);
Lcd_Cmd(_LCD_CURSOR_OFF);
Lcd_Out(1,1,"Hi WStevens_sa ");
Lcd_Out(2,1,"It's Simple");

}

 

[WStevens_sa]

You are 100% right Denshil. Thanks for the help.

I found this with the pin outs. If anybody else has this problem. This is the most basic of connecting LCD to 887.

// 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(){

ADCON1=6;

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();
}
}
}