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adc: no longer support adc2 continuous mode on esp32c3 and esp32s3

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Due to HW limitation, we don't support this anymore. On s3 and 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-s3_errata_en.pdf
https://www.espressif.com/sites/default/files/documentation/esp32-c3_errata_en.pdf
This commit is contained in:
Armando
2022-12-12 11:00:47 +08:00
committed by morris
parent 6aa7091199
commit b4c90c44d2
4 changed files with 66 additions and 53 deletions
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12
docs/en/api-reference/peripherals/adc_continuous.rst
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@@ -209,7 +209,7 @@ Hardware Limitations
- Random Number Generator uses ADC as an input source. When ADC continuous mode driver works, the random number generated from RNG will be less random.
.. only:: esp32 or esp32s2 or esp32c3 or esp32s3
.. only:: esp32 or esp32s2
- ADC2 is also used by the Wi-Fi. :cpp:func:`adc_continuous_start` has provided the protection between Wi-Fi driver and ADC continuous mode driver.
@@ -225,6 +225,14 @@ Hardware Limitations
- ADC continuous mode driver uses SPI3 peripheral as hardware DMA fifo. Therefore, if SPI3 is in use already, the :cpp:func:`adc_continuous_new_handle` will return :c:macro:`ESP_ERR_NOT_FOUND`.
.. only:: esp32c3
- ADC2 continuous 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.
.. only:: esp32s3
- ADC2 continuous mode is no longer supported, due to hardware limitation. The results are not stable. This issue can be found in `ESP32S3 Errata <https://www.espressif.com/sites/default/files/documentation/esp32-s3_errata_en.pdf>`. For compatibility, you can enable :ref:`CONFIG_ADC_CONTINUOUS_FORCE_USE_ADC2_ON_C3_S3` to force use ADC2.
Power Management
^^^^^^^^^^^^^^^^
@@ -255,4 +263,4 @@ Application Examples
API Reference
-------------
.. include-build-file:: inc/adc_continuous.inc
.. include-build-file:: inc/adc_continuous.inc