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Tactility/Drivers/xl9555-module
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Ken Van Hoeylandt 85b61e1e43
Improve module configuration (#661) 
DTS modules (device modules) often have a single source file with an empty `struct Module`.
The module's yaml file now allows a `dts-only` boolean to be set, so the source file becomes optional.
`devicetree.yaml` is renamed everywhere to `module.yaml`
2026-09-25 21:56:37 +02:00
..
bindings
Add LilyGO T-Deck Max (e-paper) base board support (#552)
2026-07-08 08:40:09 +02:00
include
Add LilyGO T-Deck Max (e-paper) base board support (#552)
2026-07-08 08:40:09 +02:00
source
ESP-IDF v6.1 (#649)
2026-09-13 00:52:16 +02:00
CMakeLists.txt
Add LilyGO T-Deck Max (e-paper) base board support (#552)
2026-07-08 08:40:09 +02:00
LICENSE-Apache-2.0.md
Add LilyGO T-Deck Max (e-paper) base board support (#552)
2026-07-08 08:40:09 +02:00
module.yaml
Improve module configuration (#661)
2026-09-25 21:56:37 +02:00
README.md
Add LilyGO T-Deck Max (e-paper) base board support (#552)
2026-07-08 08:40:09 +02:00

README.md

XL9555 I/O expander

A driver for the XL9555 16-bit I2C-bus I/O expander, used by several LilyGO boards (e.g. T-Deck Pro Max) for power-rail enables, reset lines, and antenna/audio routing. Its register map is PCA9555-compatible: two 8-bit ports for input, output, polarity inversion, and direction, addressed as pins 0-15 (port 0 = pins 0-7, port 1 = pins 8-15).

It does not support pull-up/down resistors or high-impedance outputs; requesting those flags returns ERROR_NOT_SUPPORTED.

License: Apache v2.0