I downloaded the USB boot loader (generic_boot20_pc13.bin) to STM32 Blue pill and I am able to detect the board in Arduino IDE. But when I flash the simple blinky code to board from Arduino IDE, the board looses connection. When USB boot loader is fl...

The LED connected to the Blue Pill board on PC13 pin blinks after power up. Just to check the pulses on that pin, probed and seeing the attached pulses. Why are these pulses generated? I haven't seen any data about this in any of the documents? I did...