[PIC] PIC18F26K22 and PORTB problems with LCD

[lindodv]

while I'm using PORTC for LCD input, every thing is fine. but LCD is blank while I'm using PORTB. why !?

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() {


    TRISB = 0;

    Lcd_Init();                      // LCD display initialization
    Lcd_Cmd(_LCD_CURSOR_OFF);        // LCD command (cursor off)
    Lcd_Cmd(_LCD_CLEAR);             // LCD command (clear LCD)

    LCD_OUT(1 ,1 ,"HELLO");
    LCD_OUT(2 ,2 ,"222222222222");
    LCD_OUT(3 ,3 ,"333333333333");
    LCD_OUT(4 ,3 ,"444444444444");


}

 

[milan.rajik]

PORTB may have ADC function. Configure ANSELx or ADCON1 so that pins are digital IO.

 

[zuisti]

And ... on a PIC18 always use the LATx bites, instead of PORTx bites. Eg:
sbit LCD_D4 at LATB0_bit; // RB0_bit;

 

[pjmelect]

On a Power-on Reset, RB<5:0> are
configured as analog inputs by default and
read as ‘0’; RB<7:6> are configured as
digital inputs

MOVLB 0xF ; Set BSR for banked SFRs
MOVLW 0h ; Value for init
MOVWF ANSELB ; Enable RB<7:0> for digital i/o pins
MOVLW 0h ; Value used to
; initialize data
; direction
MOVWF TRISB ; Set RB<7:0> as outputs