Arduino for STM32

If I remember well, driving BOOT0 to 3.3V will start the internal serial bootloader for ever.
In this way, after every reset you will start the internal bootloader, not your "user" program...

So may be better:

1) disconnect NRST from the serial-usb DTR
2) reset the stm32 (BOOT0 = 3.3V -> Serial ...

I'm really glad to see this forum back up and running. I'm just starting to play around with the STM32 micros- I've been using the 8bit Arduinos for a couple of years now and want to start using something a bit more powerful.
I've used a Robotdyn STM32F103C8 board for a couple of projects and haven ...