Making PORT A an input

Cliffyballs — Fri, 30 Oct 2009 04:30:40 GMT

Is it possible to make Port A an input for the push button componet. If so how would I go about doing this? Port A is set up as the input and the value never changes in the address. This is the code i am working with.

XDEF Entry

ABSENTRY Entry

ROMStart EQU $4000

PORTA EQU 0

PORTB EQU 1

DDRA EQU 2

DDRB EQU 3

ORG ROMStart

Entry:

LDAA #$00

STAA DDRA

LDAB #$FF

STAB DDRB

MOVB #0,PORTB

Loop:

BRCLR PORTA,#$FF,Loop

LDAA PORTA

STAA PORTB

BRA Loop

RTS

;*****************************************

;* Interrupt Vectors *

;*****************************************

ORG $FFFE

DC.W Entry

Re: Making PORT A an input

CompilerGuru — Fri, 30 Oct 2009 12:58:23 GMT

It might help to mention what architecture (guessing S12 from the assembly code) and which setup (debug connection or Simulator?) you are using. Which derivative?

Also what "push button componet" are you refering too, a real button on the HW or some simulator component? With the simulator (and actually also with HW) you may want to have a look at the Visualization component in the HIWAVE debugger.

Daniel

topic Re: Making PORT A an input in Classic/Legacy CodeWarrior

Making PORT A an input

Re: Making PORT A an input