BS2 Timing

CanYouC3D

Hi All
·
Help!!

·I have a program that needs to read the status of five pins (P5 – P1) and then increment a counter for each pin if they are high an this has to happen in 5mSec.

And I’m stuck with a BS2 because timing of my shiftout and shiftin data.
·
A Stamp User From the Start

Post Edited By Moderator (IT Guy (Parallax)) : 8/14/2004 5:20:12 PM GMT

CanYouC3D

opps!! I should have said BS2 Timing

Jon Williams

This is pretty easy:
·

counter = counter + IN1 + IN2 + IN3 + IN4 + IN5

PS: You're likely to get more help in these forums if you add an appropriate subject title to your post.

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Jon Williams
Applications Engineer, Parallax
Dallas Office

allanlane5

Oh, Jon, you left out so much!

First, you MUST set those pins as inputs.
Next, it looked to me like the poster wanted a separate
count per input pin.

Next, you COULD read all 5 pins at the same time.

Jon Williams

Remember... the BASIC Stamp resets ALL pins to inputs.· They only have to be made inputs via code if the program has previously made them outputs, and that does not seem to be the case here.· A common beginer's mistake is to declare pins as inputs when they've never been made outputs; it's just a waste of valuable code space.

CanYouC3D was not clear in the increment values, his post reads to me as if he wants one count per pin high.· If, on the other hand, he does want them have differnt values -- and even more conveniently a binary switch is being used, this will do it:

counter = counter + (INL & %00111110 >> 1)

This is safe code; it masks the other pins on INL so they do not affect the counter.· And just in case the goal is to have a delay that is five milliseconds multiplied by the inputs P1-P5 (binary), this is simple:

delay = 5 * (INL & %00111110 >> 1)

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Jon Williams
Applications Engineer, Parallax
Dallas Office