bluepill firmware that turns it into a USB-I2C multimaster gateway with a simple serial protocol.

Ondřej Hruška fdcac81021 initial, cdc works		3 years ago
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stm32f1xx.h	initial, cdc works	3 years ago
stm32f103xb.h	initial, cdc works	3 years ago
system_stm32f1xx.h	initial, cdc works	3 years ago