Olin Lathrop wrote:
> David Duffy (AVD) wrote:
>  =20
>> I'm using assembler in absolute mode to start with.
>>    =20
>
> Yucc, don't do that.  If you need instant gratification, then forget abou=
t
> microcontrollers.  Learn to set up a relocatable project and don't look
> back.  Too many people get stuck in the trap of learning with absolute mo=
de,
> then never wanting to make the perceived jump to relocatable mode.
> Relocatable mode is nothing to be afraid of, and is important once you do=
 a
> real project.
>  =20

Hi Olin,
I've only ever used absolute mode and I'm well aware of your disdain for=20
it. :-)

I do actually intend to move to relocatable code.  There's a lot to be=20
said for learning in increments, making changes to only one thing (chip,=20
method, etc) at a time.


>> That produces nothing from the LEDs,
>>    =20
>
> Of course it won't.  As the manual clearly states (and as is customary wi=
th
> all PICs), all pins wake up in high impedence state to the extent they ca=
n.
>  =20

Yes, I understand this.  In this respect, the 18 series is no different=20
to the 12 and 16 series I've used before.

> Writing values to the port registers isn't going to have any effect until
> you set the pins to outputs.  At the very least this means clearing the T=
RIS
> bits, but may also require disabling analog peripherals associated with t=
he
> pins of interest.  Just writing 0 then some value to the port registers h=
as
> no chance of producing a visible result without making pins outputs.
>  =20

This is probably where I'm missing something.  The structure of the=20
ports is obviously different to what I'm used to. I did read the data=20
sheet, but have not yet got a grip on how the port really work.

This is one reason I asked about a very simple working assembler file. =20
I'm sure you're a clever guy, but some of us need some help from time to=20
time.
David...

--=20
___________________________________________
David Duffy        Audio Visual Devices P/L
Unit 8, 10 Hook St, Capalaba 4157 Australia
Ph: +61 7 38235717      Fax: +61 7 38234717
Our Web Site: www.audiovisualdevices.com.au
___________________________________________

--=20
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