afiqzudinhadi/zmk-steno-engine
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README: add budget recommendations + explain left/right asymmetry

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afiqzudinhadi 2026-07-04 15:38:16 +08:00
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README.md
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@ -79,6 +79,26 @@ CONFIG_STENO_SPLIT_TIMEOUT_MS=250
The build FAILS if either half's blob exceeds its budget — entries are
never trimmed.
**Budget recommendations** (nRF52840, Adafruit bootloader 0.11.0,
app ceiling 0xEA000 = 802,816 bytes):
| Config | Left | Right | Notes |
|--------|------|-------|-------|
| Both dicts (Plover + Lapwing) | 440320 (430 KB) | 519168 (507 KB) | Tight — little room for extra modules |
| Plover only | 440320 | 519168 | Comfortable — ~35 KB slack per half |
| Lapwing only | 440320 | 519168 | Comfortable |
Left budget is smaller because the central half carries more firmware
code (behavior driver, formatter, output, undo, BLE client, cache) —
leaving less free flash for dictionary data. The peripheral only runs
the GATT server + inflate decoder, so it gets the larger share.
Lower these if you add other flash-heavy modules (large RGB animations,
display assets, etc.) and the linker overflows. The compiler shifts the
value-index split point to fill the right half first; left gets the
remainder. If either budget is too small for the compiled dict, the
build errors out with the exact overshoot.
Keymap: include the behavior and bind the 23 steno keys
(see `include/dt-bindings/zmk/steno_keys.h` for all key names):