Offsets Contents
0-1 IOCtl reason code
2 IOCtl group code
3 b6 = read flag
b7 = write flag
4-7 data to read or write
IOCtl reason codes
Reason Meaning
1 Set/read baud rate
2 Set/read data format
3 Set/read handshaking
4 Set/read buffer size
5 Set/read buffer thresholds
6 Set/read control lines
7 Set/read fifo trigger level
8 read number of supported baud rates
9 read baud rate index data
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