switch ?

Hello,

I'm trying to play with my pic and active some outputs with a switch, but it does not work... I do not see what I am doing wrnog here... can someone help me to figure it out ? it must be something silly ?! (using a pic18F4331)

Code:

---

TRISA  = %00000001
TRISB  = %00000000
TRISC  = %00000000
TRISD  = %00000000
TRISE  = %00000000


'-> I/O Symbols

Symbol switch      PORTA.0 'IN
Symbol led1        PORTB.5 'OUT 
Symbol led2        PORTB.4 'OUT 
Symbol led3        PORTB.3 'OUT 
Symbol led4        PORTB.2 'OUT 
Symbol led5        PORTB.1 'OUT 
Symbol led6        PORTB.0 'OUT 

Symbol led7        PORTD.7 'OUT
Symbol led8        PORTD.6 'OUT
Symbol led9        PORTD.5 'OUT
Symbol led10        PORTD.4 'OUT
Symbol led11        PORTC.7 'OUT
Symbol led12        PORTC.6 'OUT

Low led1
Low led2
Low led3
Low led4
Low led5
Low led6
Low led7
Low led8
Low led9
Low led10
Low led11
Low led12

GoTo Main

Main:
If switch = 1 Then
    High led7
    Else
    Low led7
EndIf
 
GoTo Main

---

Can you show your schematics?

i'm sorry I am at university, and can't scan my schematics right now. But just to let you know I can successfully run this program on an 16F877...
I really don't know where is the problem. I do the PWM on the 18F but it seems it's not taking the instruction "IF" ??...
Thank you anyway...
If anyone else has a hint or something ?

Problem #1: RA0 (and more pins) are anlog inputs by default at power-up, and all pins configured as analog inputs will read 0 when used for digital I/O.

Solution = ANSEL0 = 0

Problem #2: This can cause read-modify-write issues since you have all pin aliases pointing to port pins VS port LATches;

Low led1
Low led2
Low led3
Low led4
Low led5
Low led6
Low led7
Low led8
Low led9
Low led10
Low led11
Low led12

Change your pin aliases to LAT like this and include the = sign;

Symbol led1 = LATB.5 'OUT, etc.

Thank you very much for your answer ! it works now !
If I need help again about another thing should I start another thread ? (gonna need to change duty cycle of pwm with potentiometer)
however, I do not want to be invasive.

You're welcome. For your other question, just continue on in the previous thread you started here http://www.picbasic.co.uk/forum/showthread.php?t=15149

This isn't exactly what you asked for, but here's a link to another thread for using the A/D on this PIC http://www.picbasic.co.uk/forum/showthread.php?t=6768