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Screenkey Programming: FAQs

1. What text support is included in ScreenKeys?

ScreenKeys use bitmapped graphical LCD displays. Each ScreenKey has onboard accessible RAM that is bit-mapped to a particular pixel on screen. This memory begins at address 0x80 in the key. Images are displayed on the ScreenKey by writing bit patterns to this memory.

Support functions are available to assist ScreenKey developers with converting text strings into appropriate bitmap patterns for the different ScreenKey resolution.

Please see the Application Notes section for ScreenKey text manipulation examples and sample source code.

2. Can individual pixels be turned on/off on the ScreenKey display?

ScreenKeys use bitmapped graphical LCD displays. Each ScreenKey has onboard accessible RAM that is bit-mapped to a particular pixel on screen. This memory begins at address 0x80 in the key. Images are displayed on the ScreenKey by writing bit patterns to this memory.

It is possible to select a particular location in this memory and only write to this byte. However, as ScreenKey memory cannot be read back, the controlling application must maintain a memory of the pixel contents if it wishes to update an individual pixel (as the full byte of 8 pixels must be written).