p7screen command line reference

Note

This utility is part of Cahute; see Installation guides for more information on how to install it.

p7screen is a utility originally provided with libp7 back in September of 2016 by Thomas Touhey. It is used for receiving the screen from any USB calculator in “Projector”, “Screen Capture” or “Screen Receiver” mode, and displaying it to a basic window using SDL.

Warning

This interface is provided by compatibility with libp7 / libcasio, and must not be changed to bring new features or change the syntax of existing ones.

For concrete steps on using p7screen, see Displaying the screen from a calculator.

Available options are the following:

-l, --log

Logging level to set the library as, as any of info, warning, error, fatal, none.

This option may allow contributors to visualize the effects of their contribution better, and allows users to produce a full output to join to an issue.

See Logging facilities for more information.

--com <device>

Path or name of the serial device with which to communicate, e.g. /dev/ttyUSB0.

If this option is not provided, p7screen will look for a calculator connected through USB.

--use <settings>

Serial settings to instantiate the serial link with.

This parameter is of the following format:

<Speed in bauds><Parity><Stop bits>

Where:

  • The speed in bauds is expressed as an integer, e.g. 19200.

  • The parity is either O for odd parity, E for even parity, and N if parity checks are disabled altogether.

  • The stop bits is either 1 or 2.

By default, the serial link is instanciated with a speed of 9600 bauds, no parity and 2 stop bits (9600N2).

This option is ignored if the path or name of a serial device is not provided using the --com option.

-z, --zoom

Zoom, as an integer from 1 to 16.

Having a zoom of N means that a single pixel on the calculator will be displayed as an NxN full square on the host.

Invalid options are ignored by p7screen. If an option is provided several time, only the latest occurrence will be taken into account.