Making a pair of "super" analog pins - combining DAC and ADC pins

[jcsbanks]

Where I have limited connections to the outside world and want maximum software configuration/flexibility whilst being able to use WiFi (so no ADC2) and not have the hall sensor interfere (ADC1_0 and ADC1_3):

Connect DAC_1 with ADC1_CH1 and DAC_2 with ADC1_CH2.

This would give me ADC, DAC, GPIO in two pins.

Any problems?