Hello, I am using an STM32 Nucleo F746ZG board.
I need to make an application where one board can transmit some firmware over to the second board via UART, and the second board will use it's default bootloader to read and flash that firmware.
However, according to documentation I read here: https://www.st.com/resource/en/application_note/an2606-stm32-microcontroller-system-memory-boot-mode-stmicroelectronics.pdf, on page 212, it mentions that the bootloader can only use USART1 or USART3. I cannot use USART3, since I am already using that as a VCP for debugging printf messages. Thus, I have to use USART1. However, the problem is that the USART1 pins, PA10 and PA9 pins it requires me to use, are already being used here:
The PA10 pin is being used as USB_OTG_FS_ID, and the PA9 pin is being used as USB_OTG_FS_VBUS. From what I read online, I think these pins are important if I want the STM32 to communicate with my laptop right? If so, then how am I expected to use USART1 to flash firmware when my board is running the default bootloader?
I feel like I am missing something, since the default bootloader would not give USART1 as an option if there wasn't any way to use it.
I would greatly appreciate any help. Thank you!
