Setting Multiple Pin States

David Kissick

Hey group!

This should be an easy question. I need to be able to set several pins on a BS2 from Low to High at the same time. Is there code that will do this or do I have to change them individually? for the curious, this is to control transistors driving LEDs in order to create a light show. Thanks for the help.

David

Bruce Bates

David -

Specific groups of pins can be addressed as one entity, as follows. See the PBASIC Stamp Manual or the PBASIC Editor Help File for more information.

OUTS = All 16 outputs, pins 0-15

OUTL = Pins 0-7·· OUTH = Pins 8-15

OUTA = Pins 0-3·· OUTB = Pins 4-7·· OUTC = Pins 8-11·· OUTD = Pins 12-15

INS, INH, INL, INA, INB, INC, IND operate in the same manner for inputs.

Regards,

Bruce Bates

Jon Williams

Just to follow-up on Bruce's response, when using an OUT register you'll want to use the associated DIR register as well so that you can make the pins outputs. If, for example, you wanted PO-P7 outputs, with P0-P2 high, you could do it like this:

OUTL = %00000111
DIRL = %11111111

Of course, you only need to set DIRL once, and your program can use those pins as outputs as required. If you download our StampWorks book you see that we have a little lightshow project included -- it might give you some ideas for your project.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Jon Williams
Applications Engineer, Parallax

David Kissick

Thanks Guys!

That's exactly what I needed.

David