How to group inputs for IF statements?

Comments

• Electrodude Posts: 1,682

  2015-04-08 19:04 edited 2015-04-08 19:04

  You can read a range of IO lines with ina[last..first] (please correct me if the order is wrong). You'll get them as one binary number. If all of the inputs are 0, you'll get %0000000 == 0, otherwise you'll get something that's not 0. The condition to an "if" is true if it's not 0, so all you have to do is this:
  

  repeat
    if ina[lastswitch..firstswitch]
      ' turn on LED
  

  
  To make code appear how I did it, retaining indentation and such, put it in [noparse]

  code tags like this
  

  [/noparse].
  
  EDIT:
  Here's a more advanced solution that doesn't need contiguous pins and tells you which pins are on:

  CON
  
    ' let's say we care about inputs on pins 1, 2, 3, 5, 8, 11, 14, and 18; those bits are all set in pinmask
    pinmask = %00000000_00000100_01001001_00101110
  
  PUB switchmonitor | ins, pinno
  
    repeat
      ins := ina & pinmask  ' capture the inputs we care about
  
      repeat while ins      ' while there are more inputs to process
        pinno := (>| ins)   ' get the id of the highest pin that's on
        ins &= ! |< pinno   ' mark the pin as processed (clear bit pinno of ins)
  
        ' pin #pinno is on, do something about it
  
• JonnyMac Posts: 9,507

  2015-04-08 19:05 edited 2015-04-08 19:05

  In my designs I try to make a group of inputs like this contiguous. Did you do that, or are they spread out all over the place?
• Chad1 Posts: 26

  2015-04-08 20:25 edited 2015-04-08 20:25

  Thanks! Figured it was easy