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Imgonna

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Joined: 06/08/2020
Location: United Kingdom
Posts: 15

Posted: 02:17pm 10 Aug 2020

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A sweaty afternoon all (well here in the Wales / UK it's a sweaty 27'C)

Getting hands on with CMM2 and loving it.

I also love math and random numbers --- about to code up / benchmark some performance in calculating/estimating PI, so I need some reliable random numbers.

I know the CMM2 generates random numbers through hardware -- does anyone know the specifics of this? �(Just for geeky reference really).

Currently iterating through generating 10,000,000 random numbers having started with 100,1000 etc. (generating 0 / 1 to simulate coin flipping)

Looking at the numbers generated via ChiSquared statistics - to see if they random - results in p=0.898 --> ie random (as we would expect).

Below is the code for 10,000,000 interations.

I wonder how warm the CPU will get -- BTW loved the case mode for a fan also posted here.

StartTime$ = "Start Time: "+ Time$

dim anum(2)

for y = 1 to 1
anum(0)=0
anum(1)=0

For x = 1 to 10000000

num=int((rnd)*2)
select case num
case 0
anum(0)=anum(0)+1
case 1
anum(1) = anum(1)+1
end select

if x mod 10000 = 0 then
CLS
Print StartTime$
Print ""
print "Iteration", format$(x,"%.0f")

endif

next x

Print ""
print format$(anum(0),"%.0f"),format$(anum(1),"%.0f")
next y

Print ""
Print "End Time: "+ Time$

Edited 2020-08-11 00:24 by Imgonna

Imgonna

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Joined: 06/08/2020
Location: United Kingdom
Posts: 15

Posted: 02:33pm 10 Aug 2020

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Hi

For what it's worth - 10,000,000 iterations took 5 mins 31sec.

Glen

hitsware2

Guru

Joined: 03/08/2019
Location: United States
Posts: 734

Posted: 03:03pm 10 Aug 2020

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I'm curious about a ' hardware '
random number generator ?
A zener diode with counter ?
Edited 2020-08-11 01:12 by hitsware2

my site

CaptainBoing

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Joined: 07/09/2016
Location: United Kingdom
Posts: 2171

Posted: 03:28pm 10 Aug 2020

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The onboard random generator is in the silicon (and thus hardware).

If, however, you wanna play with something you can "scope", this might be interesting http://www.fruitoftheshed.com/Circuit%20Ideas.Random-Bit-Generator-for-cryptographic-strength-random-numbers.ashx
Edited 2020-08-11 02:54 by CaptainBoing

Imgonna

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Joined: 06/08/2020
Location: United Kingdom
Posts: 15

Posted: 03:32pm 10 Aug 2020

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CaptainBoing said The onboard randome generator is in the silicon (and thus hardware).

If, however, you wanna play with something you can "scope", this might be interesting http://www.fruitoftheshed.com/Circuit%20Ideas.Random-Bit-Generator-for-cryptographic-strength-random-numbers.ashx

A quick Google of STM32 ARM and the spec sheet mentions "coupled oscillators" -- happy with that.

Thanks for the link.

Glen

Geoffg

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Joined: 06/06/2011
Location: Australia
Posts: 3308

Posted: 11:16am 11 Aug 2020

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Imgonna said I wonder how warm the CPU will get

The CPU keeps a constant speed regardless of what code it is executing or even if it is at the command prompt. So it will not heat up under heavy processing.

Geoff

Geoff Graham - http://geoffg.net

Nimue

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Joined: 06/08/2020
Location: United Kingdom
Posts: 425

Posted: 11:57am 11 Aug 2020

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Geoffg said

Imgonna said I wonder how warm the CPU will get

The CPU keeps a constant speed regardless of what code it is executing or even if it is at the command prompt. �So it will not heat up under heavy processing.

Geoff

Nice - my hacky logger has been recording for 18hrs now -- so no need to consider this.

So, summer project is to make a hacky weather station......

Nim

Entropy is not what it used to be

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