daniel-p-carvalho opened a new pull request, #20441:
URL: https://github.com/apache/nuttx/pull/20441
## Summary
Add `CONFIG_STM32_DAC_LL_OPS` support to the common STM32 DAC driver
(`stm32_dac_m3m4_v1`). This provides low-level operations (`stm32_dac_ops_s`)
and helper macros (`DAC_ENABLE`, `DAC_WRITE_DRO`, `DAC_START_DMA`,
`DAC_STOP_DMA`, `DAC_DUMP_REGS`), aligning `stm32_dac_m3m4_v1` with the
existing architecture in `stm32l4` and `stm32h7`.
This enables high-speed / real-time control applications (e.g. digital power
conversion, inverters, HRTIM synchronization, and function generators) to
operate the DAC peripheral directly without char driver VFS overhead.
## Impact
- **New Feature:** Added `llops` table and interface definitions in
`stm32_dac_m3m4_v1.h` and `stm32_dac_m3m4_v1.c`.
- **Compatibility:** Backward compatible. Only active when
`CONFIG_STM32_DAC_LL_OPS=y`.
- **User / Build:** No changes to existing configurations unless
`CONFIG_STM32_DAC_LL_OPS` is selected.
## Testing
- **Host:** Linux x86_64
- **Toolchain:** `arm-none-eabi-gcc (15:13.2.rel1-2) 13.2.1`
- **Target Hardware:** STMicroelectronics Nucleo-G431KB (STM32G431KB,
Cortex-M4)
- **Configuration:** `nucleo-g431kb:comp` with DAC character driver & LL ops
enabled.
- **Verification:**
- `./tools/nxstyle` clean (0 errors)
- `./tools/checkpatch.sh -m -g HEAD` clean (0 errors)
- Hardware run in NSH:
```text
nsh> comp test
Running comparator test on /dev/comp0...
1. Initial output state: 0
2. ANIOC_COMP_DISABLE: OK
3. Output state when disabled: 0
4. ANIOC_COMP_ENABLE: OK
5. Output state when enabled: 0
Comparator test PASSED on /dev/comp0
=== Comparator Ramp Test ===
COMP device : /dev/comp0
DAC device : /dev/dac5
Sweep range : 0 -> 4095 (step 100, delay 5 ms)
DAC= 0 (~ 0 mV) | COMP output: 1
DAC= 500 (~ 402 mV) | COMP output: 1
DAC=1000 (~ 805 mV) | COMP output: 1
-> [TRIP EVENT #1] DAC=1300 (~1047 mV) | COMP output: 1 -> 0
DAC=1500 (~1208 mV) | COMP output: 0
DAC=2000 (~1611 mV) | COMP output: 0
DAC=2500 (~2014 mV) | COMP output: 0
DAC=3000 (~2417 mV) | COMP output: 0
DAC=3500 (~2820 mV) | COMP output: 0
DAC=4000 (~3223 mV) | COMP output: 0
=== Test Summary ===
SUCCESS: Detected 1 comparator transition(s)!
```
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