Bootloader ''crash'' if accessed via USART1 and VDD_USB not connected?
Posted on November 24, 2016 at 19:00Hello,I'm having an issue where some boards will not go into the CPU bootloader via USART1 (PA9/PA10) unless I have the USB cable attached. Details:- STM32F412 CPU- VDD_USB pin (C11 on BGA-144 package) not connect...