reading digital input pins

disable_analogs

.include "p24Hxxxx.inc"
.text
.global __reset
__reset:
    ; Turn of analog to digital converter for all pins
    mov    #0xffff, W0
    mov    W0, AD1PCFGL

    ; Set RA0 through RA3 as inputs (1), the rest as outputs (0) (easy way to remember: 1 looks like I for In, 0 looks like O for Out)
    mov    #0xf, W0
    mov    W0, TRISA
    
    ; Set all PORTB pins as outputs
    mov    #0x0, W0
    mov    W0, TRISB
    ; Continuously read PORTA and use the 4bit value from RA0 through RA3 to determine which PORTB pin to set
loop:
    ; Read input pins
    mov    PORTA, W0
    ; Mask out the output bits
    mov    #0xf, W1
    and    W0, W1, W0
    ; Convert the pin number to a bit pattern with all pins 0 except the pin at PORTB[W0]
    mov    #0x1, W1
    sl     W1, W0, W0
    ; Set the output pin
    mov    W0, PORTB
    ; And jump back to the start
    bra    loop

set_bits_right

bset LATA, 0
bset LATA, 1

set_bits_wrong

bset PORTA, 0
bset PORTA, 1