View Full Version : New User Questions

05-15-2008, 01:28 AM
Just getting started with Propeller on the Demo board and have a couple
of questions:

1. The very first demo program, Output.spin, works fine, for
pins 16 or 17. Changing the pin number to 18, for instance,
causes to LEDs to blink. Explanation ?

2. Does anyone have timing information for the math functions,
i.e. number of cycles, just roughly.


05-15-2008, 01:39 AM
Sorry, I solved the first question - you know how
it is with new users (enthusiastic but clueless).


05-15-2008, 06:23 AM
Which math functions, assembler or spin? The number of cycles for all the assembler instructions are in the data sheet and manual (all 4 cycles). The spin instructions are around 40 to 100 times slower. If you want to find out do something like this

PUB test(num1,num2):temp1,temp2,temp3
return temp2-temp1

Something to be careful of is that this will take different amounts of time depending on where the variables are.

05-15-2008, 08:17 AM
Thanks for the reply.

I saw the assembler cycles; should have mentioned
I was curious about the Spin cycles.

I have tested in the way you suggest in other languages, however,
I'm just getting started with Spin and I'm not an adept programmer
in any language.


05-15-2008, 09:22 AM
Try the VGA Demo - it's magic http://forums.parallax.com/images/smilies/cool.gif

Ken Peterson
05-16-2008, 12:12 AM
speaking of spin cycles....has anyone made a propeller based washing machine?


05-16-2008, 01:27 AM
@Ken Peterson
LOL, but I do not think so.

I am 1011, so be surprised!

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Oldbitcollector (Jeff)
05-16-2008, 02:11 AM
Ken Peterson said...
speaking of spin cycles....has anyone made a propeller based washing machine?

Oh no! I'm not going there.. Then I've have one more task to do before I can play with the Propeller. :) :)


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