[enh] ADC: added PGA control on compatible devices #138
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Some members of the CH32 range have a built-in Programmable Gain Amplifier integrated into their ADC.
I tested it on the CH32V203, and all 4 settings (X1 to X64) work.
However, only X1 and X4 seem to have an accurate gain while the rest has pretty large deviations.
For the ADC that don't have a PGA the API remains identical, but for those who do the API is changed slightly with the addition of the PGA setting to the
.convert()function.