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* Use float-enabled printf implementationDavid Phillips2020-12-20
| | | | | I hadn't realised there is a float-enabled printf implementation in AVR libc, so let's use that instead of our own hack.
* Initial prototypeDavid Phillips2020-12-13
This patch adds a skeleton of AVR code for a "simulator" target (atmega2560) and for the real intended hardware target (atmega32u4). The simulator target is one that is supported by the QEMU AVR emulator, while the 32u4 is currently not.