dcgong2917 opened a new pull request, #19899:
URL: https://github.com/apache/nuttx/pull/19899
## Summary
Adds a shared Ameba SAR-ADC driver plus per-chip integration for three
Realtek parts. Structured as three self-contained commits (each builds and
can be reviewed independently):
- `arch/arm/rtl8721dx`: the shared driver (`arch/arm/src/common/ameba/
ameba_adc.{c,h}`) + pke8721daf integration and board table
- `arch/arm/rtl8720f`: RTL8720F chip header + board table
- `arch/arm/rtl8721f`: RTL8721F chip header + board table
The converter is exposed as a NuttX ADC character device at `/dev/adc0`.
It has a single channel-switch list; the board bring-up selects which
channels are sampled and which analog pad each external channel maps to.
Every listed channel is sampled, in order, on each `ANIOC_TRIGGER`.
The driver sits on the SDK fwlib register layer and reads the auto
channel-switch FIFO by polling in task context (the hardware does not
enable a software-trigger path, so this is the supported on-demand read).
It reports the raw right-aligned conversion code, matching the NuttX
convention used by other in-tree ADC drivers.
Per-chip differences (pinmux code, aux clock gate, the real fwlib
`ADC_InitTypeDef` size) live in each `ameba_adc_chip.h`; the shared driver
mirrors only the leading opmode/cvlistlen/cvlist prefix it actually writes
and sizes a `reserved[]` tail from `AMEBA_ADC_INIT_SIZE` with a
`static_assert` so a new port cannot under-size the stack object. The
per-chip ClkDiv write is guarded by `AMEBA_ADC_HAS_CLKDIV` (only amebadplus
has that field at that offset).
## Impact
New opt-in feature (`CONFIG_AMEBA_ADC`, default n). No change to existing
configurations. Documentation updated for each board's `index.rst`.
## Testing
Built and hardware-tested on all three targets (`<board>:adc` config,
`adc` NSH example):
- pke8721daf (RTL8721Dx): PB19 grounded -> 132, PB19 @3.3V -> 3886,
other channel steady (channel isolation OK)
- rtl8720f_evb (RTL8720F): grounded -> 5, @3.3V -> 3863, isolation OK
- rtl8721f_evb (RTL8721F): grounded -> 123, @3.3V -> 3918, isolation OK
nxstyle clean (only the standing vendor-symbol Mixed-case exemptions).
CMake and make builds both verified for each board.
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