Naming I/Os in SX/B

Comments

• Bean Posts: 8,129

  2007-02-12 17:21 edited 2007-02-12 17:21

  Clint,
  · You can only name individual pins (RC.0) or the whole port (RC).
  · To do three pin you would use "OR" and "AND" to set or clear the bits as needed:
  
  · temp = value << 4················ ·'·Get bits in position
  · temp = temp OR %1000_1111 · ' Create AND mask
  · RC = RC AND temp·············· ·· ' Clear bits that are zero
  · temp = temp AND %0111_0000 ' Create OR mask
  · RC = RC·OR temp··················· ' Set bits that are one
  
  · It might make more sense to just do:
  
  · RC.4 = value.0
  · RC.5 = value.1
  · RC.6 = value.2
  
  Bean.
  
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  Post Edited (Bean (Hitt Consulting)) : 2/12/2007 5:28:36 PM GMT
• Clint Posts: 95

  2007-02-12 17:38 edited 2007-02-12 17:38

  Thanks for the response Bean. I think I will use this structure unless someone has a better idea.

  · It might make more sense to just do:
  
  · RC.4 = value.0
  · RC.5 = value.1
  · RC.6 = value.2
  
  
• JonnyMac Posts: 8,941

  2007-02-12 21:11 edited 2007-02-12 21:11

  I, too, have been down this road and agree with Bean. I usually bundle this code into a subroutine so that it's easy to call when/where I need it. You can do something like this to pass any [noparse][[/noparse]byte] variable to your port bits:
  
  

  SET_PORT:
    RC.4 = __PARAM1.0
    RC.5 = __PARAM1.1
    RC.6 = __PARAM1.2
    RETURN