On Tuesday, November 29, 2022 7:15:08 AM MST Johan Hovold wrote: > Also note that the FTDI driver does in fact leave the line speed > unchanged when B0 is requested (that zero-baud check in > get_ftdi_divisor() is only used for ASYNC_SPD_CUST). I tested it empirically today, and you're right, the FTDI driver simply does not change the baud rate. Thank you for correcting my misunderstanding. > Your application really should not depend on any particular hardware > setting after requesting B0. Understood. > That said, I've implemented support for B0 in cp210x which leaves the > current settings unchanged (and which incidentally allows you to > use the buggy tool). Excellent! Many thanks! -Alex