Smart Terminal Parameter Examples
What/Why/How the Parameter File
A lot of the behavior of the terminal is controlled by the file parameters.py. Different projects of mine require different parameters. The first parameters that might spring to mind are the port and baud rate for the terminal. But the parameter file can change so much more: some are simple like adding a colored band to the terminal ( useful if you have more than one terminal running at a time ) to adding whole new modules that modify the graphical user interface ( GUI ) and add automatic processing. While this file has the basic structure of a asci text file, you should keep in mind that it is an executable Python file. This means it is programmatic, you can use any Python you want ( pretty much ) but try to limit yourself to setting the value of instance variables in the parameter object.
More information on this approach to configuration in: Configuration Files For Python.
- To start with you can just run with the parameter file as shipped. This gives a reasonable terminal that runs fine, but probably will not run with the baud rate and comm port that you desire, so almost for sure you will need to adjust these. There are lines near the top of the parameter file to do this. For more info see the section below.
- Another method is to use different parameter files for different projects. These might be copied into the smart terminal directory when you want to use them. Works fine but is cumbersome. Start from my file and modify. I do not recommend this approach, but you may want to do it.
- You can also use a secondary parameter file that overrides the settings in the first file. This is great if you want to run 2 copies of the terminal. Which secondary parameter file is used is controlled from the command line. For more info see the section below. ( coming soon )
- The subroutine method. This is what I recommend for most uses. It is easy to manage and easy to switch between parameter sets. This is the method in the supplied parameter file and the one that I will use for may discussion of how the parameter file works in general. The parameter file is heavily commented and these comments should be read if you have questions. You can also search other files for parameters.xxx where xxx is the name of the parameter you are investigating.
How to Edit the Parameter File
Yous can use any editor you want ( for text type file ). One warning, however, is not to use an editor that inserts tab characters, tabs are ok if they are converted to spaces but not otherwise. Use your Python editor, that should be fine. For an external editor I use notepad++ on windows but make sure you use the tab to spaces conversion option ( google it ). The parameter file can be set up ( .ex_editor: for example self.ex_editor = r"leafpad" # linux editor ) so that a button <Edit Parms> on the GUI will open the parameter file in the editor. After saving the file you can get a very fast restart of the app with the new parameter using the <Restart> button.
Structure of the Default Parameter File
In the __init__ method after a couple of required lines that help hold the application together there is a call to self.default_terminal_mode(). This subroutine sets a ton of parameters and this is enough to make the terminal run nicely. See the comments in the subroutine for more info.
I then have a call to a short ( so far ) subroutine called os_tweaks( ). This subroutine uses a parameter identifying the OS you are running on to tweak some of the settings. These may be useful to you or not. Change them if you want.
In a similar way there is a subroutine called self.computer_name_tweaks( ) This subroutine uses the already/automatically set parameter computername to tweak a few settings depending on the computer's name. This makes it easy for me to change the default parameters setting based on the computer I am using to run the program. Thus I can move the program around without changing the parameter file. These setting, as shipped, are probably not useful to you, but they may be useful as an example.
Finally there is a list of calls to subroutines, typically each one is for a different type of setup or mode, all but one should be commented out. So I might make a call to a subroutine like: self.well_monitor_mode(). This is the mode for an arduino/python project that monitors my water well pressure. It is a pretty complicated set up, because of the database access in the well monitor. For this documentation I will do a subroutine called tutorial_example_mode() which make the most basic changes from the default mode.
All the rest of the documentation will refer to this method of structuring the parameter.py file. You could instead just have a separate parameter file for each application/mode that just ran from top to bottom. I have found this method more useful.
This mode just changes the default baudrate and the buttons/default data for the button. Read the comments ( here or better in the actual file ) , they are pretty clear:
def tutorial_example_mode( self, ): """ this mode does not do anything usefull except illustrate a simple "mode subroutine" """ self.mode = "TutorialExample" # this name will appear in the title of the window # to help keep track of which mode you are using self.baudrate = 19200 # changes the baucrate from the default to 19200 # the send_ctrls is a list of 3 valued tuples # for each item in the list you will have a "send button", a button that will send the contents of # the data entry field to the right of it to your comm port. # the first item of the tuple is a sting whose test will be on the button # the second is a string with the initial or default value for the data entry field # the third is a boolean, True make the data entry field editable, otherwise it is protected from edit self.send_ctrls = [ # text cmd can edit ( "Send", "", True ), ( "Send", "", True ), ( "Different Title", "default", True ), ( "More Different", "yes different", True ), ] # you may get extra buttons with default values to fill the space
Another example mode
make it a bit more complicated. Still needs to be written.
Instance variables and their meanings ( in code use self.xxxx as they are instance variables ). This reference is not exhaustive, for that you must use the supplied parameters.py and its comments.
- logger_id: the id used in the logging file
- pylogging_fn: file name for the python logging
- logging_level: python logging level of severity for message to be logged to the logging file
- win_geometry: the size of the window when first opened
- ex_editor: name of an executable file used to edit files related to the terminal
- port_list: a list of ports that the automatic connect routine will use to find a connection
- port: default port to open
- baudrate: comm port baudrate
- serialAppend: characters ( like cr and lf ) placed at the end of transmitted strings
- auto_open = False # true to open port on start up # !! *todo
- prefix_send: a prefix shown in the "receive area" to show that the data has been sent
- prefix_rec: a prefix shown in the "receive area" to show that the data has been recieved
- prefix_info: a prefix shown in the "receive area" prefix for informational messages
- echoSend: locally echo the sent characters
- get_arduino_version: string sent to get arduino to respond with its version string
- arduino_version = "GreenHouse" # should be part of the string th
- arduino_connect_delay = 10 # may not be implemented yet
- gui_sends = 15 # number of send frames in the gui beware if 0
- max_send_rows = 3 # the send areas are added in columns this many rows long, then a new
- default_scroll = 1 # 1 auto scroll the recieve area, else 0
If you want to add some of your own GUI and processing elements to the terminal the next parameters add a module name and class name that will be loaded into the application
- ext_processing_module: module name
- ext_processing_class: class name
- our_os: "win32" if your are running windows -- used by os_tweaks().
- computername the name of your computer if available ( it is on windows, linux ?? ) used by computer_name_tweaks().
For the Second Thread, the Helper Thread
- queue_length = 20
- queue_sleep = .1
- id_color: color for an "ID pane" just below the title bar of the window
- id_height: height of the "ID pane" if 0 there is no pane
- bk_color = "blue" # color for the background, you can match the id color or use a neutral color like gray
- icon: name of icon for the application
- mode name for the mode of the SmartTerminal, used in the title of the SmartTerminal window and may be use in code.
- self.win_geometry a string that specifies the initial size of the SmartTerminal window
Using a Second Parameter File
If you running 2 instances of the SmartTerminal you probably do not want to run with the same parameters ( they would use the same comm port ). So if they run with different parameter files they can be quite different. The idea here is they start with the same parameter file, parameters.py and are then extended with a second file ( say parameters_a.py or any other name you wish ). This is done by using a command line. For example: python smart_terminal.py parameters=paramaters_a
The difference in this file is the parameters are not self.xx but parameters.xx. Else it is pretty much the same. See the example file parameters_a.py.