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adc: no longer support adc2 continuous mode on esp32c3

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Due to HW limitation, we don't support this anymore. On c3, ADC2 under continuous  mode is not stable.

However, you can enable CONFIG_ADC_CONTINUOUS_FORCE_USE_ADC2_ON_C3_S3 to force use
ADC2.

Refer to errata to know more details:
https://www.espressif.com/sites/default/files/documentation/esp32-c3_errata_en.pdf
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Armando
2022-12-16 12:47:14 +08:00
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parent dc4c9c087f
commit 9b4986dd2c
4 changed files with 33 additions and 7 deletions
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5
docs/en/api-reference/peripherals/adc.rst
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@@ -58,8 +58,9 @@ ADC Limitations
.. only:: esp32c3
- A specific ADC module can only work under one operating mode at any one time, either Continuous Read Mode or Single Read Mode.
- ADC1 and ADC2 can not work under Singel Read Mode simultaneously. One of them will get blocked until another one finishes.
- For continuous (DMA) read mode, the ADC sampling frequency (the ``sample_freq_hz`` member of :cpp:type:`adc_digi_config_t`) should be within ``SOC_ADC_SAMPLE_FREQ_THRES_LOW`` and ``SOC_ADC_SAMPLE_FREQ_THRES_HIGH``.
- For continuous (DMA) read mode, the ADC sampling frequency (the ``sample_freq_hz`` member of :cpp:type:`adc_digi_config_t`) should be within ``SOC_ADC_SAMPLE_FREQ_THRES_LOW`` and ``SOC_ADC_SAMPLE_FREQ_THRES_HIGH``
- ADC2 continuous (DMA) mode is no longer supported, due to hardware limitation. The results are not stable. This issue can be found in `ESP32C3 Errata <https://www.espressif.com/sites/default/files/documentation/esp32-c3_errata_en.pdf>`. For compatibility, you can enable :ref:`CONFIG_ADC_CONTINUOUS_FORCE_USE_ADC2_ON_C3_S3` to force use ADC2.
Driver Usage
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