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eb5d89cd83
This was necessary to un-wedge the USJ TX path on ESP32-P4, I think because the bootloader prints a lot on this chip. I think it might be possible to hit it on other chips, though. The implementation is based on the ESP-IDF driver, which will always add an extra flush when the TXFIFO is empty in case the host is expecting a ZLP. This work was funded through GitHub Sponsors. Signed-off-by: Angus Gratton <angus@redyak.com.au>