PIC18F4550 problem, Please help!!!!

[ABSF]

CODE: SELECT_ALL_CODE

#define   sw1         PORTBbits.RB0   // sw1 defined as input for SW1 on MB00

void main(void)
{
TRISA=0xFF;
TRISB=0xFF;
TRISC=0x00;
TRISD=0x00;
LATC=0x00;
LATD=0x00;

for(;;)
{
   if(sw1==1)
{
LATC++;
}
   else if (PORTA!=0x00)
{
LATD++;
}
}          //for end
}          //main end


change to above and it will work. You also need a 10K resistor to GND at the junction of your switch and input port.

Allen

[robosang]

CODE: SELECT_ALL_CODE

TRISA=0x0FF;
TRISB=0x0FF;
TRISC=0x00;
TRISD=0x00;
PORTC=0x00;
PORTD=0x00;
for(;;)
{
if(PORTBbits.RB0==1)
{
PORTC++;
}
else if (PORTA!=0x00)
{
PORTD++;
}
}


Too fast! Put some delay in the if statement.

Also Port A is normally share with Analog input, by default they are analog input, so you will have problem using as digital input if it is not configured properly.