Bas van Dijk wrote: > Hello, > > I'm trying to understand how the baudrate divisor and subdivisor are > encoded in the value and index fields of a 'SIO_SET_BAUDRATE_REQUEST' > control request. > > I looked at the 'ftdi_convert_baudrate' function which does the actual > encoding but failed to understand how the encoding really works. > > What I basically want to know is given a divisor for example: 3 and > subdivisor: 0.125 (1/8) how these values are encoded in the value and > index fields.
x = 32-bit temporary register The divisor is stored directly in x[13..0] The subdivisor is encoded into x[16..14] using the mapping in AN232B-05 value[15..0] is from x[15..0] index[15..0] is from x[31..16] except on ft2232c, where: index[15..8] is from x[23..16] index[7..0] is the interface number Check the libftdi source and ftdi_sio.c Linux driver for examples -jim -- libftdi - see http://www.intra2net.com/en/developer/libftdi for details. To unsubscribe send a mail to [email protected]
