Cannot set PortB of PIC18LF1220 to input

[Tiwana6330]

I am using PIC18LF1220. The output functions (on PortA) work fine, however, the input functions on PortB are not working. I have checked hardware connections to Pin and they are fine. I think I am missing something in the code. My code is as below.

#include <hitech.h>
 #include <stdio.h>
 #include <pic18.h>
 #include "delay.c"
#define _XTAL_FREQ 20000000  //20Mhz
  
 void main (void)
 {
    ADCON0 = 0x00;
     ADCON1 = 0x0F; // Configure all ports with analog function as digital      INTCON=0;
    TRISA=0;
     TRISB=255;
    PORTA=0;
 
    while (1)
     {
        if (RB1==0) 
           RA1=1;
       else
          RA1=0;
 }

Can anyone point what is wrong? Have I missed setting some register? thanks for your help

 

[srjth.m1]

TRISB = 0b11111111;//makes Bport input
TRISA = 0b00000000;//makes A port output

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why you are using 20 mhz clock in this program? try with 4 Mhz,set oscon reg ..

 OSCCON= 0b01101111;

 

[Tiwana6330]

TRISB = 0b11111111;//makes Bport input
TRISA = 0b00000000;//makes A port output

- - - Updated - - -

why you are using 20 mhz clock in this program? try with 4 Mhz,set oscon reg ..

 OSCCON= 0b01101111;

Thanks. It works now.

why would TRISB =255; not work and TRISB = 0b11111111; work?

 

[srjth.m1]

TRISB = 0b11111111;

..this means 0b-from this compiler can easily understand you are giving some binary data.Always try to do in this forms!!

 

[fareen]

set the PWMcon0 register to zero
or any other register related to portb