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ADC Accuracy problem

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Hello everybody,

Have someone noticed about lack of accuracy of PCDuino v2 ADC?

I am doing a very simple test, a simple resistor divider with 3V3 and ground, resulting in 1.66V, but I am reading something like 1.7~1.8V on ADC.
The same applies when I change this same resistor divider to 5V and ground, resulting in 2.5V, ADC reads 2.7V.

Is this right on this board?
I used all the ADCs 2-5, no way to work as expected.

Just saying, I tested the same approach in Arduino and it works flawlessly.

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