Module screen 

The screen-size record: a 256-byte EEPROM-backed record at a linear flash address that the page-addressed frames cannot reach.

A block erase clears it and a firmware write never restores it, so it is read and set by value. The other card commands, one frame each, are here too.

Functions

geometry

Geometry encoded in a record.

looks_erased

True when the record has been erased rather than programmed.

read

Read the record off the card.

reload

Ask the card to reload its parameters from flash; full sends the vendor’s post-save frame instead of the bare reload.

screen_size

Show the record, and optionally set the geometry it carries. Returns the geometry the card holds when the command finishes.

set_layout

Tell the card its own size and the size of the whole screen.

test_mode

Select the card’s built-in test pattern; 0 is off.

test_sweep

Step through the card’s test patterns, pausing on each, then switch off.