Hi,
> void main(void)
> {
> // make all pins of port A as outputs
> TRISA = 0;
> // Configure LCD_PORT if in use
> TRISB = 0;
> // Configure LCD control pins
> TRISD = 0xF7;
>
> // Put all PORTA outputs to high
> PORTA = 0xff;
>
> }
You might fall out of main here, causing a RETURN on an empty call
stack, which in turn might lead to a RESET and PORTA = 0.
Try adding a
while (1) { /* halt */ }
after your
PORTA = 0xff;
Any watchdog enabled by default?
Also make sure to configure your PORTA for digital I/O---it is
multiplexed with Timer0 (RA4 = T0CKI), Oscillator input (RA6),
ADC (RA5 and RA3:0).
Consult Section 10.1 of the 18f2455-family datasheet for more
details, basically setup you device using
ADCON1 = 0x0f; // configure PORTA<5,3:0> for digital I/O
CMCON = 0x07; // configure PORTA<3:0> for digital I/O
TRISA = 0x00;
LATA = 0xff;
Hope that helps,
Raphael
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