Note. Most "generic" STM32F103 boards only have a reset button, and not a user / test button. So the bootloader code always configures the Button input pin as PullDown, hence if a button is not ...

I'm running v 1.9.0 STM32 Core on Arduino 1.8.5 on a Blue Pill STM32F103. I'm trying to run the i2c_scanner Example, but it never finds any devices. I've looked with an oscilloscope at both lines and ...