Bluepill STMF103C8
Serial “uart0” of mynewt is actually using USART2 peripheral, which has default pin mapping of TX2: A2, RX2: A3
Haven't yet tested SPI, I2C, Timers, etc.
Lots more great info at stm32duino wiki: https://wiki.stm32duino.com/index.php?title=Blue_Pill
board pinouts
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