raiden00pl opened a new pull request, #20181:
URL: https://github.com/apache/nuttx/pull/20181
## Summary
`uart_writev()` queues output one byte at a time via `uart_putxmitchar()`.
Add `uart_putxmitbuf()` that `memcpy()`s a whole run into the TX ring buffer
and use it when no per-byte processing is needed (`OPOST` and `ECHO` clear,
not a console). On a full buffer fall back to `uart_putxmitchar()`, which
keeps the blocking and error handling unchanged.
8 MiB `write()` to `/dev/ttyACM0` on nRF52840: 455 -> 573 KB/s.
Guarded by `CONFIG_SERIAL_TXBULK`, default `!DEFAULT_SMALL`
## Impact
improve raw output serial performances
## Testing
stream ADC data on nordic power kit 2 with 100ksps which is performance
achieved by original nordic firmware
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