basic question reading inputs

Comments

• Oldbitcollector (Jeff) Posts: 8,091

  2008-10-15 00:01 edited 2008-10-15 00:01

  Here's some code from the PEkit Labs.
  
  

  [size=2][code]
  
  [b]PUB[/b] ButtonLed                                ' Pushbutton/Led Method
  
      [b]dira[/b][noparse][[/noparse]­0]  := 1                            ' P0  → output
      [b]dira[/b][noparse][[/noparse]­1] := 0                             ' P1 → input (this command is redundant)
                                               
      [b]repeat[/b]                                   ' Endless loop
  
         [b]outa[/b][noparse][[/noparse]­0] := [b]ina[/b][noparse][[/noparse]­1]                    ' Copy P1 input to P0 ouput       
  
  
  

  
  
  
  
  [/code][/size]
  
  
  
  
  Try the PEkit labs, you'll find a lot of information there.
  http://forums.parallax.com/showthread.php?p=617192
  
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  Post Edited (Oldbitcollector) : 10/15/2008 3:46:28 AM GMT
• Ell Posts: 2

  2008-10-15 00:41 edited 2008-10-15 00:41

  thank you very much. I'll check those websites out
• Beau Schwabe Posts: 6,576

  2008-10-15 04:41 edited 2008-10-15 04:41

  Ell,
  
  If you want to get tricky, you can configure one of the counters to function as a simple·logic inverter gate with a 12.5ns propagation delay that·won't require any processor overhead.· That way you are free to do other things in code rather than using an IF/THEN statement to set the pin state.
  
  Note: you only need to call "PUB Inverter" once in your code.
  

  CON
  _clkmode = xtal1 + pll16x
  _xinfreq = 5_000_000
   
  APIN = 0        'Input Pin
  BPIN = 3        'Output Pin
   
  PUB MainProgram
      Inverter                                'Start counter to function as an inverter
      repeat                                  'Endless loop ; Keep COG alive
  
  PUB Inverter
      DIRA[noparse][[/noparse]BPIN]~~                            'Make BPin an Output
      CTRA :=  %01001 <<26 | BPIN <<9 | APIN  'Setup counter for POS detector with Feedback mode
      FRQA := 1                               'Start Counter
  

  
  
  
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  Beau Schwabe
  
  IC Layout Engineer
  Parallax, Inc.
  
• Cluso99 Posts: 18,071

  2008-10-15 06:05 edited 2008-10-15 06:05

  @Beau: I hadn't thought of using a counter like that. I haven't played with the counters but I know there must be a lot of uses for them.
  Thanks for the enlightenment