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a48b5246cc
ESP32 in revision0 and revision1 uses touchpad to provide current to oscillate xtal 32k. But revision2 and revision3 do not need to do that. Note: touchpad can not work and toupad/ULP wakeup sources are not available when toupad provides current to xtal 32k
esp_hw_support
This component contains hardware-related operations for supporting the system. These operations
are one level above that of hal
in that these(1) use system services such as memory allocation, logging, scheduling
or (2) may be multi-step operations involving/affecting multiple parts of the SoC.
Implementations that don't fit other components cleanly, but are not worth creating a new component for (yet) may also be placed here as long as they don't pull dependencies other than the core system components.