Clone this repo:
  1. 8b74399 Add missing header by Benjamin Lerman · 1 year ago main
  2. 7c1a821 Reset optarg in Coordinator::parseOptions by Colin Cross · 1 year, 1 month ago
  3. ba5e84e Merge "hidl2aidl - recommend frozen false" by Treehugger Robot · 1 year, 2 months ago upstream/main-16k-with-phones
  4. 6ed1df1 hidl2aidl - recommend frozen false by Steven Moreland · 1 year, 3 months ago
  5. 7dcb7c5 hidl2aidl: module_current -> system_current am: 2c3a670cf2 by Steven Moreland · 1 year, 4 months ago


Full documentation can be found here:

hidl-gen is a compiler for the HIDL (HAL Interface Design Language) which generates C++ and Java endpoints for RPC mechanisms. The main userspace libraries which this compiler uses can be found at system/libhidl.

1. Build

m hidl-gen

2. Run

Note that options for hidl-gen expected to be invoked by the build system are marked with ‘internal’ in the help menu.

hidl-gen -h

hidl-gen -o output -L c++-impl -r android.hardware:hardware/interfaces -r android.hidl:system/libhidl/transport android.hardware.nfc@1.0

Some defaults for package roots are also provided

hidl-gen -o output -L c++-impl android.hardware.nfc@1.0
hidl-gen -o output -L vts android.hardware.nfc@1.0
hidl-gen -L hash android.hardware.nfc@1.0

Example command for vendor project

hidl-gen -L c++-impl -r

See and for examples of how to generate HIDL makefiles (using the -Landroidbp option).

NOTE: When using the -Landroidbp option, you can force generated modules to be installed in /system_ext rather than other partition by putting a marker file .hidl_for_system_ext alongside *.hal files.

NOTE: You can also install the vendor variant of the generated modules to be installed in /odm rather than /vendor by putting a marker file .hidl_for_odm alongside *.hal files.


This is a helper tool to convert C headers to valid .hal files.

m c2hal && c2hal -h