acassis commented on PR #3187:
URL: https://github.com/apache/nuttx-apps/pull/3187#issuecomment-3355937817

   > > > we made a similar thing, but in the kernel side by implementing a cmux 
serial driver. The major difference is that the kernel driver could work in the 
interrupt context and more fast.
   > > 
   > > 
   > > CMUX is something that NuttX is missing for a long time, why only now 
that someone contributed it you say: "we have a better
   > 
   > The first version done one year ago, but it isn't perfect, that's why we 
just upstream host side tool in Feb: 
[apache/nuttx#14823](https://github.com/apache/nuttx/pull/14823).
   > 
   > Until the last month, @Gary-Hobson finish a major refactor, the new 
version is under the testing.
   > 
   > > and faster implementation?" It is not fair! Hehehe
   > 
   > Anyway, the implementation is totally different(kernel v.s. userspace), so 
both can coexist without conflict.
   
   True, and the userspace implemented can just be copied to older NuttX 
version without dependence on kernel code


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