saramonteiro opened a new pull request #3029:
URL: https://github.com/apache/incubator-nuttx/pull/3029
## Summary
This PR adds the termios support for ESP32-C3 according to NuttX support.
Support status:
Termios Interfaces:
1. `cfgetspeed()` and `cfsetspeed()` are implemented by the OS and relies on
`tcsetattr` and on `tcgetattr`.
2. `cfmakeraw()` was implemented by the OS.
3. `tcdrain()` - Associated IOCTLS were implementes in `serial.c`
4. `tcflow()` - Pending
Requires TCXONC ioctl to be implemented with the following actions:
TCOOFF suspends output.
TCOON restarts suspended output.
TCIOFF transmits a STOP character, which stops the terminal
device from transmitting data to the system.
TCION transmits a START character, which starts the terminal
device transmitting data to the system.
No chip implements it.
3. `tcflush()` - Associated IOCTLS were implementes in `serial.c`
4. `tcgetattr()` - Associated IOCTLS were implemented in `esp32c3-serial.c`.
5. `tcgetsid()` - Interface declared but never defined in NuttX.
6. `tcsendbreak()` - Interface declared but never defined in NuttX.
7. `tcsetattr()` - Associated IOCTLS were implemented in `esp32c3-serial.c`.
-------------------------------------------------------------------------------------------------------------
DEBUG feature: TIOCSERGSTRUCT IOCTL was implemented.
## Impact
All ESP32-C3 users.
## Testing
The tested was perfomed using the `termios` example. (This example will
still be submitted to `/apps`)
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