Trying to program LCD1602 in PICGenios using PIC16F877A

[eagl1]

Hi,

I'm working to get the LCD1602 embedded in PICGenios board using PIC16F877A.

I've tried this code but it's not working.

` void pic_init(void){ TRISA = 0b00000000; TRISB = 0b00000000; TRISD = 0b00000000; TRISC = 0b00000000; TRISE = 0b00000000; }

void lcd_init(void){
__delay_ms(25); ADCON1 = 0b00001111; lcd_cmd(0x33);lcd_cmd(0x32);lcd_cmd(0x28); lcd_cmd(0x0f);lcd_cmd(0x01);lcd_cmd(0x80);
}

void lcd_cmd(char cmd){ PORTD = cmd; PORTE &= ~(1 << LCD_RS);
PORTE |= (1 << LCD_EN); delay_us(10); PORTE &= ~(1 << LCD_EN); delay_ms(5); }

void lcd_data(char dat){ PORTD = dat; PORTE |= (1 << LCD_RS); PORTE |= (1 << LCD_EN); delay_us(10); PORTE &= ~(1 << LCD_EN); delay_ms(5); }

void move_cursor (unsigned char row, unsigned char col){ if(row == 1){ lcd_cmd(FIRST_ROW + col); }

if(row == 2){
    lcd_cmd(SECOND_ROW + col);
}

}

void lcd_string_arr(char str[]){
char i; for(i=0; str[i] != 0; i++){ lcd_data(str[i]); } }

void lcd_string_ptr(const char *msg){ unsigned char cnt=1;

while((*msg) != 0){
    lcd_data(*msg);__delay_ms(2);
    msg++; cnt++;
    if(cnt == DDRAM_AFTER_CHAR16){
        lcd_cmd(SECOND_ROW);
        msg--;
    }
    if(cnt == DDRAM_AFTER_CHAR32){
        lcd_cmd(CLEAR_DISPLAY);
    } 
}

}

void lcd_string_xy(unsigned char row, unsigned char col, char str[]){ if(row == 1){ lcd_cmd(FIRST_ROW + col); } if(row == 2){ lcd_cmd(SECOND_ROW + col); } lcd_string_arr(str); }`

In this main I'm using this test code:

`void main(void) {

pic_init();
lcd_init();    

lcd_string_xy(0, 1, "lcd test");
__delay_ms(2000);
lcd_cmd(CLEAR_DISPLAY);     

while(1){

}

}`

[lcgamboa]

Hi @eagl1 ,

Your code is for 8-bit mode and you are setting the display to 4-bit mode.

void lcd_init(void){
__delay_ms(25);
ADCON1 = 0b00001111;
lcd_cmd(0x33); <-- normally the configuration must be done with sending three times the same value. 
lcd_cmd(0x32);
lcd_cmd(0x28);  <--- this line must be lcd_cmd(0x38) to work (or 0x33, 0x32)
lcd_cmd(0x0f);
lcd_cmd(0x01);
lcd_cmd(0x80);
}
``

[eagl1]

Yes, also I found the source code here: https://github.com/lcgamboa/picsimlab_examples/tree/master/docs/board_McLab2/PIC16F877A/test_b3/src/test_b3.X

And copied it, and it's working :)

Thanks.