dcgong2917 opened a new pull request, #19588:
URL: https://github.com/apache/nuttx/pull/19588
## Summary
Expose the RTL8721F general-purpose UARTs through the shared Ameba serial
driver in `arch/arm/src/common/ameba`. Only chip-specific glue is added:
- `arch/arm/src/rtl8721f/ameba_uart_chip.h` — rtl8721F register bases,
IRQs,
clock masks and UART TX/RX pin-mux function codes consumed by the common
driver.
- Build wiring in `Make.defs`, `ameba_board.mk` and `CMakeLists.txt` (both
make and cmake paths), guarded by `CONFIG_AMEBA_UART`, adding the common
`ameba_uart.c` and the fwlib RAM register-layer source.
- A board port table (`rtl8721f_uart.c`) registering UART0 at `/dev/ttyS1`
on PA24/PA25. The LOG-UART keeps the console and `/dev/ttyS0`.
- A new `uart` board config enabling the driver with the `serialrx` /
`serialblaster` examples and runtime TERMIOS support, plus docs.
The common serial layer is reused unchanged. This mirrors the GPIO port
(#19582) pattern for this IC.
## Impact
- New feature for RTL8721F only; gated by `CONFIG_AMEBA_UART` (default n).
- No change to the shared `common/ameba` sources or to other boards/ICs.
- UART3 is shared with Bluetooth and is intentionally not exposed.
## Testing
Built and flashed on the RTL8721F EVB (make and cmake both build a clean
`nuttx.bin`; checkpatch and nxstyle pass; defconfig is canonical).
Hardware-verified via a PA24/PA25 loopback:
- `serialrx`/`serialblaster` single-message echo (`hello_uart`) — pass.
- 2600-byte throughput, zero loss — pass.
- TERMIOS reconfiguration: CS7 data-bit truncation (0xa5 -> 0x25), parity
and stop-bit ioctl round-trip, and 9600-baud reprogramming — all pass.
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