PIC Microcontroller Program Flow Methods

• See: Instruction Listing, GOTO, CALL, Paging
• Register <, >, <=, or >= a constant or a register
• Test if a value is in or out of a range
• Test if a value is a power of two
• Conditionally replacing one value with another
• Tony Nixon's 8 and 16 bit comparison quick reference
• Multitasking / Context Switching
• Handling flags or boolean variables
• Forcing a hardware reset and detecting the cause of a reset/restart
• Detecting a change in a port, timer, etc...
• String matching
• Code generator  for keyword matching from a serial text stream by Nikolai Golovchenko Wow!
• New 18Cxx2 functions
  • Function pointers (like in "C")
  • Unlimited computed goto (or table lookup)
  • Multilevel returns
  • Exception handling (like in C++) (or C's setjmp/longjmp)
  • Co-routines/cooperative tasks with mainline cocalls only
  • Co-routines/tasks version allows all cocalls
  • Preemptive real-time multitasking kernel

• See also:

  • http://websites.ntl.com/~matthew.rowe/micros/virbook/logic.htm routines from Andrew Warren
  • http://www.seanet.com/~karllunt/picmacro.htm Karl Lunts PIC Macros (FOR...NEXT, CASE, REPEAT, POLL, WAIT, etc..) (cached 20000317)
  • http://www.actum.com visually edits state diagrams and outputs PIC assembly code.

Archive:

• List post "Beginner assembler questions concerning loops and conditionaljumps" +
• PICList post "how to compare two numbers" +
• PICList post "Compare 4 number method. Please help!"

See also:

• David A Cary refers to

  http://www.microchipc.com/Hi-Tech_C_speed_optimization.htm Is there a page on massmind somewhere that shows the (assembly-language) skeletons of various kinds of loops ?
  kinds of loops:
  (#of iterations not known before the last iteration) do...while(), while()...loop, (#of iterations known at run time before loop starts) do_N_times, (#of iterations known at compile time) do_10_times, ... any others ?
  (... mention counting *down* to 0 optimization ...)

• swstmt.htm Choosing between 3 or more alternatives: ``switch...case...default'' AKA ``select...case'' AKA ``case..of''.
• multitasking.htm Multitasking / Context Switching

Questions:

• Is there any way to use the "if" command not as a conditional assembly command, but actually as you would use it in C or Java while your programming in assembly?
  See Karl Lunts PIC Macros listed above

Comments:

PICList 2008 contributors: o List host: MIT, Site host massmind.org, Top posters @20080821 Apptech, Jinx, Xiaofan Chen, olin piclist, Alan B. Pearce, William \Chops\ Westfield, Cedric Chang, Tamas Rudnai, David VanHorn, Vitaliy, * Page Editors: James Newton, David Cary, and YOU! * Roman Black of Black Robotics donates from sales of Linistep stepper controller kits. * Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters. * Monthly Subscribers: Shultz Electronics, Timothy Weber, on-going support is MOST appreciated! * Contributors: Richard Seriani, Sr.

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