Simple question concerning ADC Resolution

Hardware Arduino Due
1

The arduino due has 12bit ADC's (0-4095). As a default the resolution is set to 10bit (0-1023).
Does the board read the values faster when the ADC's are in 10bit mode? Even faster when in 9 bit mode?

that's all I need to know : )

2

No.

3

because it just removes the last bit after calculation?

4

you may see it yourself in wiring_analog.c :

			// Read the value
			ulValue = adc_get_latest_value(ADC);
			ulValue = mapResolution(ulValue, 10, _readResolution);

after adc return 12-bits value, there is a call to mapresolution, where:

static inline uint32_t mapResolution(uint32_t value, uint32_t from, uint32_t to) {
	if (from == to)
		return value;
	if (from > to)
		return value >> (from-to);
	else
		return value << (to-from);
}

result is truncated down via >> shift operator