Parsing commands and parameters



THE BOOK of DT's INTERRUPTS is an organization of interrupt service routines and other works written by Darrel Taylor, RIP.

Interrupt routines are arranged per Darrel's original list. Darrel Taylor's Instant Interrupts are an extension of the work of Tim Box whom in October of 2002 wrote INT_CTRL.pbp

Many of the forum members felt this is a long overdue project.

THE BOOK of DT's INTERRUPTS
will be a valuable resource and a tribute to Darrel Taylor the "Fanatical Contributor".

THE BOOK of DT's INTERRUPTS is located at http://dt.picbasic.co.uk/

+ Reply to Thread
Results 1 to 5 of 5
  1. #1
    Join Date
    Nov 2003
    Location
    Greece
    Posts
    3,275

    Default Parsing commands and parameters

    The project involves an arithmetic keyboard (0-9,*,#) on a device that has a module that can be programmed with parameters.

    In fact it is a portable transmitter with a module programmable with power level, frequency etc.

    My PIC is the good ol' F886 and since it has 8K of flash I d'rather not spend it with if-then tests.

    I would like to have an efficient way for the user to enter commands and parameters for example like this:

    *10
    responds with a beep
    434925
    responds with a beep

    I know this can be done with lots of if-then or select case but maybe there is a better way.

    Ioannis

  2. #2
    Join Date
    May 2013
    Location
    australia
    Posts
    2,118


    Did you find this post helpful? Yes | No

    Default Re: Parsing commands and parameters

    ask yourself

    what is the biggest command sequence that will be input ?
    how does the pic know when the input seq is complete ?

    when you know those answers then the answer will be obvious
    Warning I'm not a teacher

  3. #3
    Join Date
    Nov 2003
    Location
    Greece
    Posts
    3,275


    Did you find this post helpful? Yes | No

    Default Re: Parsing commands and parameters

    The commands following the * will not be more than 99 so * and two digits for the commands.

    The parameters are max 6.

    Once Melanie had posted a similar example for rs232 communication but has its limits.

    Ioannis

  4. #4
    Join Date
    May 2013
    Location
    australia
    Posts
    2,118


    Did you find this post helpful? Yes | No

    Default Re: Parsing commands and parameters

    so a command is *99 or *9 or *09 [where 9 == a numeric digit]
    and a parameter is 9 up to 999999

    how do you signal that the command has been input and the parameter begins

    i would be tempted to use the # as enter

    so cmd 33 p2010 would be
    *33#2100#
    you will need to establish a method to cope with numbers bigger than a word

    you need a method first then code it
    Warning I'm not a teacher

  5. #5
    Join Date
    Nov 2003
    Location
    Greece
    Posts
    3,275


    Did you find this post helpful? Yes | No

    Default Re: Parsing commands and parameters

    For a more compact and maybe easier to code the command and data be at defined length.

    So command 9 would be 09 and data 9 (this is extreme but for the sake of discussion) would be 00009.

    So there is no need for extra termination character.

    Also I think word or long variable may not be helpful here. Better an array, since the data are distinct in meaning so a 433925 would mean 433,925MHz in reality as an absolute value.

    The beeps would help user to step with confidence entering the commands and data.

    I think stuffing an array and then select case is the way to do it.

    Ioannis

Similar Threads

  1. Serin parameters ??
    By Rony in forum General
    Replies: 6
    Last Post: - 21st August 2011, 18:01
  2. dc motor parameters
    By iugmoh in forum Off Topic
    Replies: 0
    Last Post: - 10th October 2009, 19:32
  3. DC motor parameters ?
    By iugmoh in forum Off Topic
    Replies: 2
    Last Post: - 28th June 2008, 10:46
  4. MCSP Bootloader Parameters
    By CocaColaKid in forum General
    Replies: 0
    Last Post: - 19th September 2005, 18:15
  5. @ Device Parameters
    By Randy_Suwanee in forum General
    Replies: 2
    Last Post: - 11th August 2004, 14:40

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts