pinout for stm32duino with bluepill I am running the blinking LED program with stm32duino, and an STM32.  By trial and error, and a bit of debugging, I have worked out the following:

pin C13 blinks as well as the built in LED
(except my external LED is on the built-in LED is off)
the constant LED_BUILTIN equals 17

I found this pinout: https://stm32duinoforum.com/forum/wordpress/wp-content/uploads/2016/07/The-Generic-STM32F103-Pinout-Diagram.pdf

But it says nothing about C13 being pin 17.
Does anybody know where to look to find out where the arduino pins line up to the codes on the board?
OK if this helps anybody, they give you constants for every pin that look like PC14 for the one that says C14, so you don't need to worry about the integers that they assign to the pins.
I mean there are constants named for the yellow boxes on the above diagram.