Context:
Two issues on the Freenove gamebook: (1) long passages were clipped —
the reading band was small and text overflowed; (2) the 5-way pad was
decoded wrong, so navigation felt random, and on this unit the physical
Up button is electrically dead (held = no voltage change).
Approach:
Give the reading text the whole screen height in a vertically
scrollable container, split selection from scrolling, and remap the
keys to the pad's MEASURED voltages.
Changes:
- display_ui: gamebook view reworked — compact title, a full-height
scrollable reading container (the body wraps and scrolls, never
clipped), and a one-line choice selector pinned at the bottom; new
display_ui_gamebook_scroll() + reset-on-new-passage; show() gains a
reset_scroll arg; body buffer 512 -> 1100.
- gamebook.c: controls matched to the measured ladder
(key2=LEFT, key4=DOWN, key5=RIGHT, key1=CLICK; key3 unused; Up dead):
Left/Right scroll the text up/down, Down cycles the answer, Click
validates; library nav cycles tiles without needing Up.
Impact:
Long passages are fully readable (they scroll), and all four working
pad buttons do the right thing; nothing depends on the dead Up button.
Hardware-calibrated against the real pad voltages.
clement