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# GEX Firmware for STM32F072
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This is the STM32F072 GEX firmware, supporting all STM32F072 GEX boards (including the F072 Discovery).
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## Links
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GEX repositories are mirrored on GitHub to make it easier to submit issues and propose improvements
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via "pull requests". **Please use the upstream repository** when cloning to ensure you have the latest
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version of the code. The mirrors are kept up-to-date, but they may fall behind.
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- [git.ondrovo.com/gex/gex-f072](https://git.ondrovo.com/gex/gex-f072) - upstream (F072)
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- [git.ondrovo.com/gex/gex-core](https://git.ondrovo.com/gex/gex-f072) - upstream (GexCore submodule)
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- [github.com/gexpander/gex-f072](https://github.com/gexpander/gex-f072) - GitHub mirror (F072)
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- [github.com/gexpander/gex-core](https://github.com/gexpander/gex-core) - GitHub mirror (GexCore submodule)
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## Building the Firmware
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Make sure you clone the repository recursively (`git clone --recursive ...`), or run
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`git submodule update --init` afterwards, to initialize the GexCore submodule.
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In order to build the firmware, first copy the configuration file template `build.mk.example` to
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`build.mk`, modify as desired, then run `make` to build the binary image (see the Make Targets
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section below for more options).
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Individual GEX units can be enabled or disabled in `build.mk`, and the target platform (your GEX
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board model) is selected here as well. The config file is excluded from version control.
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## Requirements
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Listed versions were used during development. Other (particularly newer) versions may work too,
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but without a guarantee. Please submit patches needed to fix incompatibilities, or at least let me
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know.
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- **arm-none-eabi-gcc** (v8.1)
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- **arm-none-eabi-binutils** (v2.30)
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- **arm-none-eabi-newlib** (v3.0)
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- **make** (GNU, v4.2)
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- **tr** (GNU coreutils 8.29 - but any version should work)
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- **dfu-util** (v0.9) for DFU flashing
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- **stlink** (texane, v1.5) for ST-Link flashing
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## Make Targets
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- **make** - basic build (recommended to use with `-j` for faster builds)
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- **make flash** - flash using `st-flash`
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- **make dfu** - flash using `dfu-convert` and `dfu-util`
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- **make clean** - clean files generated during build
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All make targets depend on all Makefiles, meaning any modification triggers a full (`-B`)
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rebuild the next time you try to build or flash the firmware.
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