ADC Calibration Needed for ESP32-C6

[CIumsy]

ESP32-C6 ADC readings are currently inaccurate due to lack of proper calibration. Need to implement ESP-IDF's adc_cali API to use factory-stored eFuse calibration values for accurate voltage measurements for battery monitoring.

[CIumsy]

We did try this in oneshot mode, ADC calibration was achieved but, there are still concerns of sampling rate and maybe more.
If this is not the right solution, let's close this issue or find a workaround to this. @lorforlinux

[lorforlinux]

@CIumsy, NPG has a default gain of 1650x, and if you pull down IO14, then the gain will be 990x. We have to create an example code to send uV data over BLE at 500sps while using the calibrated mV data function/method.