dcgong2917 opened a new pull request, #21059:
URL: https://github.com/apache/nuttx/pull/21059
## Summary
Wire the shared Ameba RTC driver up on the AmebaSmart (RTL8730E) CA32 and
register the clock at /dev/rtc0, with the one-shot alarm when RTC_ALARM is
set.
- Chip specifics go in ameba_rtc_chip.h: the RTC interrupt is GIC SPI 12
(NuttX IRQ 44); APBPeriph_RTC is bit 19 and APBPeriph_RTC_CLOCK is bit 3
(both bit 3 on RTL8721Dx).
- The AP ROM carries no RTC_* symbols, so the SDK's RAM-side fwlib
ameba_rtc.c is compiled into libameba_fwlib.a, in both make and CMake.
- The shared driver (common/ameba/ameba_rtc.c) is not modified.
- Adds an `rtc` configuration with the alarm example, and the board
documentation.
## Impact
Only the rtl8730e_evb board and the rtl8730e arch directory are touched,
and only when CONFIG_AMEBA_RTC is enabled. Other chips are unaffected.
The scripts/Make.defs change only widens the --no-warn-mismatch condition;
the CMake build gets the same flag from AMEBA_EXTRA_LIBS, so the first
commit carries [skip-cmake-parity].
## Testing
Host: Linux (WSL2), arm-none-eabi toolchain from the SDK.
Board: RTL8730E EVB (Cortex-A32, SMP), `rtl8730e_evb:rtc`.
- checkpatch: clean on both commits.
- Built with make and with CMake; the nsh, adc and rtc configs build.
- On hardware:
nsh> date
Wed, Oct 28 00:00:46 2026
nsh> date -s "Oct 28 12:00:00 2026"
nsh> date
Wed, Oct 28 12:00:04 2026
nsh> alarm 5
Alarm 0 set in 5 seconds
alarm_daemon: alarm 0 received
Cold start reads the configured build date, `date -s` takes effect and the
clock keeps counting, and the 5 second alarm fires on time.
Note: the RTC is reset by CHIP_EN, power-on and system reset (the board
reset button), so the time does not survive that; it does survive BOR,
thermal, deep-sleep and watchdog resets. This is documented on the board
page.
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