Lcd; Pokeys Configuration Software Usage - PoKeys PoKeys57CNC User Manual

PoKeys user manual

7.9. LCD

PoKeys devices support connecting one alphanumeric LCD module up to a size of 4x20 (4 rows, 20
columns). The selection of the module is limited by support for HD44780 or compatible chipset.
Usually these displays come in various sizes - 1/2/4 line with 8/16/20 characters and colors (black
letters on green background, white letters on blue background ...).
PoKeys57CNC device has a dedicated connector for such LCD displays - see the pinout section of the
manual for connector pinout description.
Figure 21: Typical 2x16 character LCD
LCD display can be used to display various data. A third-party application or a script can execute all
supported operations, including LCD initializing, clearing, moving cursor, setting display shifting
mode, custom character defining and displaying text.
PoKeys57CNC devices by default function in buffered LCD mode. In this mode, any LCD-related
command that is sent to PoKeys device is first buffered and when possible, PoKeys device executes
the LCD refresh on its own. In this mode, some LCD operations are not operational – cursor
movement is controlled by the PoKeys device and cursor move or display commands may not work
as expected. If this low-level control is desirable, buffered mode must be deactivated first. In other
cases, it is advisable to use buffered mode in order to allow better load balancing in PoKeys devices
and in the end obtain greater communication speed.
Before LCD initialization, the LCD module size (number of rows and columns) must be specified and
appropriate pin assignment (primary or secondary, see the table above) must be selected. Secondary
pins must be selected in case of matrix LED display 2 in use.

PoKeys configuration software usage

Functions of this interface can be tested through PoKeys settings application. Just open Peripherals >
Test LCD... and dialog below will appear.
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