Chapter 5 — Keypad Input

This chapter will teach keypad input as state, not just a single read.

Planned coverage:

MON-3 scanKeys and scanKeysWait
key constants for arrows, GO, AD, digits, and no-key
zero and carry flag meanings from the key scan call
waiting for a key vs polling for a key
edge-triggered actions
held-key repeat
normalizing different physical keys to the same program action

Tetro and Pacmo both use keypad input, but in different ways. Tetro has movement, rotation, soft drop, pause, and restart. Pacmo normalizes directional controls for a scrolling maze. Those patterns should appear later, after the basic keypad contract is clear.

← First Program

Book 2

Text on the LCD →