Adafruit STM32F405 'Feather' which has an in-ROM bootloader showing up as a 'Universal Serial Bus Device > STM32 BOOTLOADER when properly configured and plugged in to WIN10. Blink OK.
One of the features of this thing is the availability of an aux Lithium-type battery for which code is provided (by Adafruit) to check the voltage level. It is necessary to use the IDE 'Serial Monitor' to do so, but 'Serial Monitor' apparently doesn't understand the 'Universal Serial Bus Device > STM32 BOOTLOADER' and wanted COM1. And I complied. The OS complained, with various bells and clanging noises which included a message that my USB device 'was no longer recognized'.
So I went back to the 'Port' parameter to try to back out of the thing, and un-check COM1, but the IDE won't allow me to un-check COM1. 'Preferences.txt' includes three statements about Serial Ports, but rather than fight it I just re-installed the IDE. Not my hill to die on today (last night)
Does this mean I can't use the Serial Monitor when this thing is communicating via this 'Universal Serial Bus Device > STM32 BOOTLOADER'? I hope not.
Thanks to all for any comments or suggestions!
John Adcock - WM6W