ESP32-S3 and -C3: analogread on ADC2 channels broken

[softhack007]

This is a reminder for future consideration:

espressif is planning to remove support for ADC2 analog input on -C3 and maybe also on -S3 chips.

• [Discussion] Remove the support of ADC2 digital controller on ESP32-S3 and ESP32-C3 (IDFGH-8691) espressif/esp-idf#10135

Affected:

Due to the hardware limitation of ESP32-S3 and ESP32-C3 (See errata: S3 section 1.1, C3 section 1.1), we plan to remove the support for ADC2 in IDF drivers.

• For S3, the digital controller (ADC-DMA) can't be used with ADC2, while you are still able to use ADC2 with RTC controller (one-shot).
• For C3, the ADC2 can't be used at all, because both one-shot and ADC-DMA are realized by digital controller.

Which microcontroller/board are you seeing the problem on?

ESP32-S3, ESP32-C3

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