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Contents Starting OutKeep these things in mind when writing your scripts:. Use a plain text editor to compose your scripts. Make sure it is saving the file as TEXT-ONLY. Do NOT use programs like Word, wordpad or other advanced editors. These insert hidden header info and use non-standard ASCII characters for Return/Line-Feed commands, quotation-marks, and others. The simplest of text-editors will suffice (Notepad in Windows, nano in Linux for example.) Scripts must be saved as ASCII plain text. UTF-8 may work, but is not recommended because some editors insert a at the start.
Mac users see. Keep all commands in lower-case.
Variables are case-sensitive (a and A are not the same). In versions prior to 0.5.5 you are limited to 8k (8192 bytes) for the size of your script - CHDK Build 119 or later.
(2k (2048 bytes) in CHDK Build 116 or earlier.). Be aware that not all commands work on all cameras, if you plan on sharing your script try to keep it as generic as possible unless you have a special need for the camera-specific commands. Try to also provide a more generic version so that all may benefit from it. If using earlier CHDK Builds some commands listed here will not be available to you and cause errors, this tutorial will be updated as new commands and changes are made to CHDK. Keep your script concise and efficient! It takes 10ms of time for each line of your script to be interpreted by tiny uBASIC.
If your script is 10 lines long this takes 1/10th of a second, 100 lines takes a full second, etc. This can greatly impact high-speed uses. Even rem statements take 10ms to be processed, use them sparingly. See this section in the discussion area for for further info. In versions 0.5.5 and later, up to 100 rem statements and labels will be executed before a 10ms wait is required. If you write an interesting script, please share it with the rest of us on the User Written Scripts pages so we may learn from you!
Beginner script-writers can be some of the most creative!. See these pages for some ideas and examples if you are just starting out:. Two new Scripts Menu options have been added to some special builds, read about them in the on the firmware usage page. By using these two options in conjunctions with these scripts, you are able to execute any script when first powering on your camera. This allows you an unlimited number of favorite Custom shooting modes and USB-Remote functionality. You may want to write your scripts taking these extra features into account.
Allbest Build Special Note: It has been found that you cannot just simply select the much desired Tv, Av, and ISO Override features from its menus and then expect them to work in scripts. If using or writing scripts for the Allbest Build any special override shutter-speeds, aperture, and ISO values will have to be hard-coded into your scripts. If not then your scripts' shoot command will just use whatever standard manual or automatic exposure features selected. Consider the Allbest Override features for manual use only, at this time. See the section for available script commands if you need to use these override features in scripts. This has since been made more compatible in the latest Allbest builds.
Now your CHDK menu override-value features will take precedence, unless they are overridden by commands in your scripts.The Script Header When viewing scripts you'll often see an opening section (or script header) that look something like this:@title Interval shooting@param a Shoot count@default a 5@param b Interval (Minutes)@default b 0This script header section allows you to define the script's name, identify which version(s) of CHDK are compatible, insert any comments or user notes needed, and define 'user parameter variables' that can be set at script run time from the CHDK Script menu. Documentation for the script header can be found here:After you have configured your script via the header section, then comes the brunt of your script, the part that does the actual work and tells the camera what to do, when to do it, and what buttons or commands need to be executed.
Since we are working with a very small subset of the larger uBASIC programming language, we will list and explain only those functions that are available to the CHDK script writer.The Basics of BASIC Programming Logic Commands All programs are designed to mindlessly repeat some commands. In order to make them work in the proper order, and the correct number of sequences, they have to be contained in some simple recurring loops and counters. Testing for when some condition has been met, before it can go onto the next command, or finally end the program (script).There are several ways this can be done in BASIC. By using numeric counters, and loops. There are some built-in commands to simplify these tasks.The LET Command This one is simple. If you see a command that says 'let a = 2' then that's exactly what happens.
It defines the value of 2 to the variable a.This command is mostly included just for legibility. You can leave off the let command and it will still work. Example: let a=2 can be written more simply as a=2.
Or this example: if z5 then let b=0 can be simplified to if z5 then b=0. Doing so will greatly save on script space if you have to define and redefine many variables many times.The IF / THEN / ELSE Command These are used to test for the truth of a certain condition.
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