[GitHub] [incubator-nuttx] v01d opened a new issue #3392: TERMIOS

[GitBox <gi...@apache.org>]

v01d opened a new issue #3392:
URL: https://github.com/apache/incubator-nuttx/issues/3392


   ```
     Description: Need some minimal termios support... at a minimum, enough to
                  switch between raw and "normal" modes to support behavior like
                  that needed for readline().
                  UPDATE:  There is growing functionality in libs/libc/termios/
                  and in the ioctl methods of several MCU serial drivers (stm32,
                  lpc43, lpc17, pic32, and others).  However, as phrased, this
                  bug cannot yet be closed since this "growing functionality"
                  does not address all termios.h functionality and not all
                  serial drivers support termios.
     Status:      Open
     Priority:    Low
   ```


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[GitHub] [incubator-nuttx] acassis commented on issue #3392: TERMIOS

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acassis commented on issue #3392:
URL: https://github.com/apache/incubator-nuttx/issues/3392#issuecomment-813691992


   I think the next step is to list the Arch(es) that need(s) support. I noticed that the FreeModbus was modified to include "speed_t" that comes from Termios, this "inoffensive" modification was enough to make FreeModbus dependent on Termios. Now all MCUs will need to support Termios (or at like say it supports) to get FreeModbus compiled.
   
   This modification is not a bad thing, modifying FreeModbus to use Termios will allow it to setup its own baudrate and parity without depending on user to configure it in Serial Driver Configuration inside the menuconfig.


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[GitHub] [incubator-nuttx] robertlipe commented on issue #3392: TERMIOS

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robertlipe commented on issue #3392:
URL: https://github.com/apache/incubator-nuttx/issues/3392#issuecomment-831706991


   There's a LOT in "all termios.h functionality" that will never get used. Marking input parity errors (try that in a DMA/FIFO world), 50 baud, and FFDLY/FF1 (wait two seconds after sending a ^L without sending any data or exercising any flow control while the printer advances the platen since it "obviously" has no receive buffer) are a waste of time and complexity in this century. (And some of the previous century...) Full termios support would probably blow out a PIC.
   
   I'd suggest narrowing this request substantially. Being able to support bit rate via integers instead of via CBAUD enums is nice and that's reasonable. If you didn't care about binary compatibility with ancient UNIX, you could do that with termio instead of termios.  Coding OLCUC and IUCLC because your five bit tty doesn't have lower case letters is a bit silly.
   
   Is the bugreport here really "want readline to work" instead of "all termios functionality"?
   
   Either Ken or Dennis called the terminal driver the biggest regret in original UNIX. :-)


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