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1) Search explicitly for python2.7 In systems where python3 is default or in build cases where the user has already searched for and found python3 in CMake, store the python3 executable and search for python2.7. 2) Generate nanopb core protobuf files with CMake Generate python output files used in turn by the nanopb generator script. This removes the requirement of manually calling 'make' in the nanopb/generator/proto directory. 3) Use nanopb options file if it exists Look for nanopb options file and use in protobuf source and header generation if it exists. The options file must have the same name and path as the proto file, excluding the extension.
Nanopb is a small code-size Protocol Buffers implementation in ansi C. It is
especially suitable for use in microcontrollers, but fits any memory
restricted system.
Homepage: http://kapsi.fi/~jpa/nanopb/
Using the nanopb library
========================
To use the nanopb library, you need to do two things:
1) Compile your .proto files for nanopb, using protoc.
2) Include pb_encode.c and pb_decode.c in your project.
The easiest way to get started is to study the project in "examples/simple".
It contains a Makefile, which should work directly under most Linux systems.
However, for any other kind of build system, see the manual steps in
README.txt in that folder.
Using the Protocol Buffers compiler (protoc)
============================================
The nanopb generator is implemented as a plugin for the Google's own protoc
compiler. This has the advantage that there is no need to reimplement the
basic parsing of .proto files. However, it does mean that you need the
Google's protobuf library in order to run the generator.
If you have downloaded a binary package for nanopb (either Windows, Linux or
Mac OS X version), the 'protoc' binary is included in the 'generator-bin'
folder. In this case, you are ready to go. Simply run this command:
generator-bin/protoc --nanopb_out=. myprotocol.proto
However, if you are using a git checkout or a plain source distribution, you
need to provide your own version of protoc and the Google's protobuf library.
On Linux, the necessary packages are protobuf-compiler and python-protobuf.
On Windows, you can either build Google's protobuf library from source or use
one of the binary distributions of it. In either case, if you use a separate
protoc, you need to manually give the path to nanopb generator:
protoc --plugin=protoc-gen-nanopb=nanopb/generator/protoc-gen-nanopb ...
Running the tests
=================
If you want to perform further development of the nanopb core, or to verify
its functionality using your compiler and platform, you'll want to run the
test suite. The build rules for the test suite are implemented using Scons,
so you need to have that installed. To run the tests:
cd tests
scons
This will show the progress of various test cases. If the output does not
end in an error, the test cases were successful.