I'm hopeful that my answer is useful after about 3 years! This is because of your PCB design, not the code. Most of the microcontrollers, same as STM32F407, only have one USB port that can be configured as the Host or Device. But in the evaluation bo...

I'm hopeful that my answer is useful after about 3 years!This is because of your PCB design, not the code. Most of the microcontrollers, same as STM32F407, only have one USB port that can be configured as the Host or Device. But in the evaluation boa...