Need Some Help With Real random Class.. and random timer.

Anubisbot · 2009-05-11 13:50

Hi i need to trigger 4 Pub's at different random times.
I tried the random object form the OBEX
but dint had to much luck with it. i need to start the Pub's randomly so the time span i need is from 30 sec. to 300 sec.

PRI Main_Loop   
dira[noparse][[/noparse]11..0]~~
RR.Start

Time:= RR.Random    
 

Time2:= RR.Random


Time3:= RR.Random  

 
Time4:= RR.Random  
  

repeat
      If Time == 0
        Small_1_Left
        repeat until time > 5000000
         Time:= RR.Random
      If Time2 == 0
        Small_2_Left
        Time2:= RR.Random  
      If Time3 == 0
        Small_3_Left
        Time3:= RR.Random    
 Time--
 Time2--
 Time3--
 Time4--

I hope some one has a good idea how to solve this, maybe i am blind
but i searched for it and count find any thing

Best regards Anubisbot

Leon · 2009-05-11 14:36

You'd be better off with a pseudo-RNG.

Leon

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MagIO2 · 2009-05-11 17:15

I suppose you're decrementing the time variables inside of the loop?!

The random object generates a number in a range from 0 to ~4billion. As you do a lot of SPIN stuff inside of your loop this can take a while and I don't see any code that ensures the time being between 30 and 300s.

Time1:=30 + RR.Random & $FF···· ' would be a fast solution where the range is between 30 and 285 if that's fine for you
Time2:=RR.Random
Time2:=30 + Time2 & $FF + (Time2 & $F00) >> 8··· ' is randomly adding another 15, so the range is between 30 and 300, but it's a bit slower ... but hey, we talk about seconds ;o)

Now you sould use waitcnt to wait for seconds:

time:=0
CntToWaitFor:=cnt 
repeat
  CntToWaitFor+=clkfreq
  waitcnt( CntToWaitFor )
  time++
  case time
    Time1:
       small_1
    Time2:
       small_2
    Time3:
       small_3
    Time4:
       small_4

·As I used the case statement you should make sure that not two times have the same value.

Need Some Help With Real random Class.. and random timer.

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