splitting up an Array[s]

grasshopper · 2008-03-07 21:25

I am trying to take a number from 0 - 100 and fill an array with it. i.e

long stringdata   <------array 
long X                    <------varable

Pub Start
X = 100
loop: 
  stringdata[noparse][[/noparse]0] := 1
  stringdata := 0
  stringdata := 0
end loop

How do i write a loop using a bit shif?

help me please...

Mike Green · 2008-03-07 21:29

1) It's difficult to tell what you want to do. Remember that the forum software uses some things in subscript brackets for formatting, then deletes them, even when you use CODE markers. Put a space after the opening bracket and the forum software will leave it alone.

2) There are no labels in Spin. Read the description of the REPEAT statement. This combines the FOR / NEXT loop and the DO / LOOP statements in Parallax Basic.

grasshopper · 2008-03-07 21:48

the code i put up was an attempt at Pseudo code. Here is my concept again

I want to do a repeat so that the variable X is broke up into an array named data

        x =  100
             |||
data [noparse][[/noparse] 0 ] <-|||
data [noparse][[/noparse] 1 ] <--||
data [noparse][[/noparse] 2 ] <---|

so that when the "repeat until" is done I will have this --> data [noparse][[/noparse] 0 ] = 1 and data [noparse][[/noparse] 1 ] = 0 and data [noparse][[/noparse] 2 ] = 0

Post Edited (grasshopper) : 3/7/2008 9:54:12 PM GMT

Paul Baker · 2008-03-07 22:48

Isn't this exactly whats done by the dec methods in TV_Text, VGA_Text and FullDuplexSerial? The only difference is you're assigning it to an array while the drivers send it to the out and·tx method

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Paul Baker
Propeller Applications Engineer

Parallax, Inc.

Post Edited (Paul Baker (Parallax)) : 3/7/2008 11:12:34 PM GMT

grasshopper · 2008-03-07 23:11

Paul i am not sure what you mean. Forgive me i have been trying to program this propeller all day and i guess i need a break.

All i want to do is put a three digit number like 100 into an array so that i can display this on my LCD screen. Why is it so hard to program the propeller. I figured i could do this but i have no such luck: Thank god you are all here...

  con
  esc = $1B     'Escape code
  cr = $0D      'Carriage Return code                 
  lf = $0A      'Line Feed code
  eos = $FF     'End of string code
  eog = $FF     'End of graphics code
  space = $20   'Space character code
  max_duty = 100
  pwm1pin  = 7
  
VAR  
   long stringdata[noparse][[/noparse] 7 ]
   long x
   long number
  long stringdata1[noparse][[/noparse] 4 ] 
obj
  LCD : "LCDDEMO2"
  pwm1  :  "pwmasm"
   
pub main   
repeat 
  DISPLAY
  PULS_STIRR
  waitcnt(100_000_000 + cnt) 
     
PUB DISPLAY | Y

  LCD.init                                              'Initialize the display  
  lcd.clS
   
  RETURN  

PUB PULS_STIRR  | Y

  pwm1.start(pwm1pin)
  pwm1.SetPeriod(1_000_000)                             'high period will allow for a slow motor
   repeat x from max_duty to 100                         'linearly advance parameter from 0 to 100
      pwm1.SetDuty(x)
      waitcnt(1_000_000 + cnt)                          'wait a little while before next update
      
    repeat y from 0 to 3 
      stringdata1[noparse][[/noparse] Y ] := (x ~> Y - 1)                             ' pack the characters into a long
    lcd.cls
    lcd.writeout(stringdata1[noparse][[/noparse] 0 ])
    lcd.writeout(stringdata1[noparse][[/noparse] 1 ])
    lcd.writeout(stringdata1[noparse][[/noparse] 2 ])  
  
return

Paul Baker · 2008-03-07 23:21

What I'm saying is there are 3 objects in your Tool distribution which have sections of code which perform this task, simply pilfer it and adapt it for your own use. Here is the method from VGA_Text:

PUB dec(value) | i
'' Print a decimal number
  if value < 0
    -value
    out("-")
  i := 1_000_000_000
  repeat 10
    if value => i
      out(value / i + "0")
      value //= i
      result~~
    elseif result or i == 1
      out("0")
    i /= 10

but instead of using the out method, you would assign it to your·data array.

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Paul Baker
Propeller Applications Engineer

Parallax, Inc.

hippy · 2008-03-08 14:41

To expand on what Paul says, this will convert a three-digit decimal number into three array entries, each holding a value 0 to 9 ...

yourNumber := 123

divisor := 100
index := 0
repeat
  yourArray[noparse][[/noparse] index ] := ( yourNumber / divisor ) % 10
  index := index + 1
  divisor := divisor / 10
until divisor == 0
 
' yourArray[noparse][[/noparse] 0 ] == 1
' yourArray[noparse][[/noparse] 1 ] == 2
' yourArray[noparse][[/noparse] 2 ] == 3

Plenty of scope to optimise the code there, but shown longhand for clarity.

If you want ascii characters in yourArray[noparse]/noparse rather than numbers ...

  yourArray[noparse][[/noparse] index ] := ( ( yourNumber / divisor ) % 10 ) | $30

Post Edited (hippy) : 3/8/2008 2:48:32 PM GMT

grasshopper · 2008-03-08 20:50

Thanks Hippy and paul for helping me.
I figured it out using both of your examples .

splitting up an Array[s]

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