newbie question, setting all pins to low

Archiver

Hey great list! I'm learning a lot by lurking.

Now I have a super-newbie question, is there a way to set all the pins to
low at once? I can do it with a loop, but I'm sure there is a more
efficient way, no?

thanks!

Archiver

Yes, you can, by using the [noparse][[/noparse]internal] variables Dirs and Outs. Both are
16-bit registers and correspond to the output pins. Here's how:

Outs = $0000 ' clear outputs
Dirs = $FFFF ' make all pins outputs

Note that on reset, the BASIC Stamp will make both Dirs and Outs zero, making
all pins inputs. This puts the pins in a safe mode. Make sure you don't
have any direct shorts before you make the pins outputs.

See Table 4.2 in the BASIC Stamp manual (Version 2.0) for the details
regarding Dirs and Outs.

-- Jon Williams
-- Parallax


In a message dated 4/24/02 4:04:52 PM Central Daylight Time, raoul@c...
writes:


> Hey great list! I'm learning a lot by lurking.
>
> Now I have a super-newbie question, is there a way to set all the pins to
> low at once? I can do it with a loop, but I'm sure there is a more
>




[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

Assuming they are all already outputs (and you are using a BS2):

OUTS=0

If you want to set the direction to outputs try:

DIRS=$FF ' all outputs
OUTS=0 ' zero to all outputs

If you want to just do a byte, try:

OUTH=0

Or

OUTL=0

Depending on which byte you want.

You can also use OUTA, OUTB, OUTC, and OUTD for nibbles (or nybbles as I
was taught to spell it).

Al Williams
AWC
* Floating point A/D
http://www.al-williams.com/awce/pak9.htm



>

---

Original Message

---

> From: raoul vaneigem [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=JTsfugbykYO5pJC4uSFt1i1ImW3P_5ZUdlT8oFDzaoT9YQFnyO4gp-3oos-J0ak4uHnk5Wc3QjcNsfg]raoul@c...[/url
> Sent: Wednesday, April 24, 2002 3:03 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] newbie question, setting all pins to low
>
>
> Hey great list! I'm learning a lot by lurking.
>
> Now I have a super-newbie question, is there a way to set all
> the pins to
> low at once? I can do it with a loop, but I'm sure there is a more
> efficient way, no?
>
> thanks!
>
>
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