What is the state of programmable IO pins (eg PA, PB, etc) (a) when the device is blank (ie before first time programming), and (b) before programming during reset? STM32F103 in particular if it matters.

[waclawek.jan · Accepted solution]

a) unless you go to bootloader mode (see BOOT0 pin), there's no program which would change the pins' state from their reset state

b) reset state, see RM0008, GPIO chapter, General-purpose I/O (GPIO) subchapter

JW