Any very basic way to randomly select a number between 1 and 4096 with spin

AndyProp

What i am looking for is a very basic number generator that returns a number between 1 and 4096

Does not need to be very random, just the most simple way to get some numbers, even if they come up multiple times or consecutively.

Cluso99

If you are using spin, check the RND instruction.

Ariba

Something like that:

VAR
  long random, x


PUB
  random := CNT                 'initial seed
  repeat
    ? random                    'next random number
    x := (random & 4095) + 1    'limit to range
    ...

Genetix

Ariba,

Brilliant idea of using CNT.

Reminds me of the Apple II using the time between keyboard presses as a Random Number.

Wuerfel_21

CNT at the beginning of the program is not a good source of randomness. If you're loading over serial, it will have a semi-random value, but when loading from EEPROM, it is always(?) the same

AndyProp

@Ariba said:
Something like that:

VAR
  long random, x
  

PUB
  random := CNT                 'initial seed
  repeat
    ? random                    'next random number
    x := (random & 4095) + 1    'limit to range
    ...

Brilliant, thanks a lot.