Support other baud rates

[mfine]

We're using higher baud rates not defined - we'd like to access them if our underlying system can support them. The limited set of baud rates is currently too restrictive - this allows an escape hatch.

[hvr]

Which baudrates are you considering?

The not-so-nice thing about it is that those BOther-values are rather magical, e.g. I see

#define  B0     0000000
#define  B50    0000001
#define  B75    0000002
#define  B110   0000003
#define  B134   0000004
#define  B150   0000005
#define  B200   0000006
#define  B300   0000007
#define  B600   0000010
#define  B1200  0000011
#define  B1800  0000012
#define  B2400  0000013
#define  B4800  0000014
#define  B9600  0000015
#define  B19200 0000016
#define  B38400 0000017

#define  B57600   0010001
#define  B115200  0010002
#define  B230400  0010003
#define  B460800  0010004
#define  B500000  0010005
#define  B576000  0010006
#define  B921600  0010007
#define  B1000000 0010010
#define  B1152000 0010011
#define  B1500000 0010012
#define  B2000000 0010013
#define  B2500000 0010014
#define  B3000000 0010015
#define  B3500000 0010016
#define  B4000000 0010017

which don't have an obvious mapping between the magic value and the nominal baudrate...

[mfine]

Interesting - on our systems the defines refer to speeds:

/*

• Standard speeds
  _/
  #define B0 0
  #define B50 50
  #define B75 75
  #define B110 110
  #define B134 134
  #define B150 150
  #define B200 200
  #define B300 300
  #define B600 600
  #define B1200 1200
  #define B1800 1800
  #define B2400 2400
  #define B4800 4800
  #define B9600 9600
  #define B19200 19200
  #define B38400 38400
  #if !defined(_POSIX_C_SOURCE) || defined(DARWIN_C_SOURCE)
  #define B7200 7200
  #define B14400 14400
  #define B28800 28800
  #define B57600 57600
  #define B76800 76800
  #define B115200 115200
  #define B230400 230400
  #define EXTA 19200
  #define EXTB 38400
  #endif / (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */

Our devices have baud rates of 921600 and 1000000, neither value of which is defined in the headers :( which makes checking for the defines problematic - we really need a way just to bypass things. We're able to use this bypass successfully. Not sure what makes sense here.

[mfine]

/*
 * Standard speeds
 */
#define B0  0
#define B50 50
#define B75 75
#define B110    110
#define B134    134
#define B150    150
#define B200    200
#define B300    300
#define B600    600
#define B1200   1200
#define B1800   1800
#define B2400   2400
#define B4800   4800
#define B9600   9600
#define B19200  19200
#define B38400  38400
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define B7200   7200
#define B14400  14400
#define B28800  28800
#define B57600  57600
#define B76800  76800
#define B115200 115200
#define B230400 230400
#define EXTA    19200
#define EXTB    38400
#endif  /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */

[hs-viktor]

Closing, replaced by #216