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libm17
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M17 C library
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libm17
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# libm17 ### Overview **Libm17** is a C implementation of the [M17 protocol's](https://en.wikipedia.org/wiki/M17_(amateur_radio)) RF stack, as described by its [specification document](https://spec.m17project.org). The library includes: - soft symbol slicer (RX) and symbol mapper (TX), - convolutional encoder with soft Viterbi decoder (utilizing fixed point arithmetic), - Golay encoder with soft decoder (fixed point arithmetic), - bit interleaver and randomizer, - cyclic redundancy check (CRC) calculation (LSF/LSD and arbitrary input), - callsign encoder and decoder, - LSF/LSD META field extended callsign data, cryptographic nonce, and GNSS position data encoders/decoders, - Root Raised Cosine (RRC) filter taps (for 24kHz and 48kHz sample rates) - linear and polyphase. There's no support for **any** encryption within the library - it has to be handled by the developer, using own code. ### Address encoding convention As per the [specification document](https://github.com/M17-Project/M17_spec), the address space is divided into parts. Encodable callsign space is accessed by using the base40 alphabet. If the first character is set to `#`, the address belongs to the extended hash-address space. The broadcast address is represented by `@ALL`. Zero-address is invalid and decodes into a null-string. The reserved chunk for application use cannot be accessed using any string. ### Legacy Makefile building 1. Build the shared object `libm17.so` by running `make`.<br> 2. Optionally, the library object can be installed with `make install`. Unit tests are available and can be compiled and run with `make test && make testrun`. ### Cmake building 1. Configure the build - run `cmake -B build` to get default options.<br> 2. Build the library by running `cmake --build build`.<br> 3. At this point tests can be run by doing any of:<br> * `cmake --build build --target test`<br> * `ctest --test-dir build`<br> * `./build/unit_tests/unit_tests` 4. Finally, installation is just `sudo cmake --install build` ### Unit tests Unit tests use the [Unity](https://github.com/ThrowTheSwitch/Unity) unit testing framework.
