flash_usb: Wait for busnum file to exist when flashing with picoboot (#6690)

DangerKlippers / danger-klipper

Klipper but... Dangerous

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flash_usb: Wait for busnum file to exist when flashing with picoboot (#6690) #406

Closed rogerlz closed 3 weeks ago

rogerlz commented 3 weeks ago

This solves an issue where the USB directory could exist, but the busnum file itself may not exist immediately. This was encountered when flashing a Pico connected to a Raspberry Pi 5.

Klipper PR: https://github.com/Klipper3d/klipper/pull/6690