Failed to advance buffer ptrs in usb_cdc.Serial properly #4922
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Fixes #4921.
The
usb_cdc.Serialread and write routines did not advance the buffer pointer after the first read or write, causing data to be read into the wrong part of the buffer, or duplicate data to be written.Tested with a Pi Pico and pyserial. Original reporter @acrankyturtle will also test.