USB graceful shutdown before a software reset
I have written a bootloader that is used to update the application code via a Modbus interface over USB.
I'm still working on the code to start the bootloader when new firmware is to be uploaded to the custom board. My board has a buck and an inverting buck-boost converter that are being controlled by the MCU application code.
Right now, I'm planning on generating a software reset to restart the bootloader so that it can start receiving and programming the new application firmware. If I generate the software reset, I need the USB port to be quickly usable again so that the firmware update utility can continue to use it to transfer the new firmware.
Is there a proper and graceful way to stop USB communication in the application code, generate a software reset, then restart USB communication in the bootloader?