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Why PIC didn't see 1 on the PORTA?

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roberto.s

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Hi,

I have e stupid problem, but I can't find the solution,

this is the program:

#include <p18f2520.h>

#pragma config OSC = HS
#pragma config WDT = OFF
#pragma config LVP = OFF
#pragma config PBADEN = OFF

void main (void){
// Imposto PORTA tutti ingressi
LATA = 0x00;
TRISA = 0b11111111;
// Imposto PORTB tutti ingressi
LATB = 0x00;
TRISB = 0x00;
// Imposto PORTC tutti ingressi
LATC = 0x00;
TRISC = 0xFF;
for (;;){
if (PORTAbits.RA2 == 0){
PORTBbits.RB2 = 1;
}else{
PORTBbits.RB2 = 0;
}
}
}

easy??? yes, but why the led is always on???
I can explain....

can someone else???

may be a problem of setting?

in the circuit I have a pull-up on the input and nothing else.......
 

I cant judge your circuit as I do not see your schematic.
I guess you need to add a delay between toggling actions to see the change with your eyes.
--
Amr Ali
 

yes, but if I don't change the value of the input, the output doesn't change.

my problem is that PIC see 0 but I put 1 on the pin; the circuit is a simple pull-up (R=100K) and a switch between R + PIN and GND.

Added after 19 minutes:

I just find the solution; I forgot tu set a register.

Thank you for your intresting.

Bye!
 

you are taking input on PORTA and by default PORTA is assigned to ADC you need to first configure PORTA as a digital port in ADCON1 register then proceed forward.
it will work
 

Yes that was the register I forgot to set...

thank!
 

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