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realmnm

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Joined: 07/07/2020
Location: Australia
Posts: 34

Posted: 11:06am 19 Aug 2020

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I tried to add a minimum firmware version check to my software and found that it doesn't work as well as I would have liked. This may just be floating point issue or ?I don't know what.

Here is what I tried.

dim MINFWVERSION as float
dim CMM2VERSION as float

MINFWVERSION=5.0505
CMM2VERSION=MM.INFO(VERSION)

if CMM2VERSION < MINFWVERSION then
print:print "Sorry, appear to be running firmware version "+str$(CMM2VERSION)
print "You need to be running firmware version "+str$(MINFWVERSION)+" or higher.":print
end
endif

Let me know your thoughts.

Martin

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yock1960
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Joined: 18/08/2020
Location: United States
Posts: 167

Posted: 11:24am 19 Aug 2020

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Have you tried subtracting one from the other to see if you get the expected result?

Steve

CaptainBoing

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Joined: 07/09/2016
Location: United Kingdom
Posts: 2170

Posted: 11:27am 19 Aug 2020

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looks OK, fairly straightforward test

what don't you like? what was the result of you running this?

Need a bit more wood on the fire to help, print out the two variables so we can see what the If is working with.

I do a similar thing on the Micromite/ArmiteF4/H7 paltform but I use the string form MM.DEVICE$. I am not familiar with the idiosyncrasies of the CMM2.
Edited 2020-08-19 21:28 by CaptainBoing

Geoffg

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Joined: 06/06/2011
Location: Australia
Posts: 3292

Posted: 11:30am 19 Aug 2020

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realmnm said I tried to add a minimum firmware version check to my software and found that it doesn't work as well as I would have liked.

What is the problem? What is it that you "would have liked".

Geoff

Geoff Graham - http://geoffg.net

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10315

Posted: 11:31am 19 Aug 2020

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Just a standard floating point rounding issue

Use MINFWVERSION=5.0504999999999

realmnm

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Joined: 07/07/2020
Location: Australia
Posts: 34

Posted: 11:39am 19 Aug 2020

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That�s what I thought it might be. Thanks.

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realmnm

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Joined: 07/07/2020
Location: Australia
Posts: 34

Posted: 11:42am 19 Aug 2020

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Geoffg said

realmnm said I tried to add a minimum firmware version check to my software and found that it doesn't work as well as I would have liked.

What is the problem? �What is it that you "would have liked".

Geoff

Fireworks, Coins pouring out like I had won a Jackpot.

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mkopack73
Senior Member

Joined: 03/07/2020
Location: United States
Posts: 261

Posted: 03:40pm 19 Aug 2020

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Yeah this, and a number of other �best practices� really should be used when writing programs for this computer.

I�m starting to write these best practices up (literally started this morning) as a little book to help people write good, clean, portable and reusable code for the CMM2.

mkopack73
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Joined: 03/07/2020
Location: United States
Posts: 261

Posted: 03:41pm 19 Aug 2020

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To deal with the FP precision issue you could try to round it up to the nearest .000x before doing the comparison.

TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6283

Posted: 07:34am 20 Aug 2020

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if MM.INFO(VERSION) < (5.0505-0.0001) then print "too old" else print "All good"

VK7JH
MMedit

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