I am trying to understand the use of Positive and Negative Mux input in ADC, I have recenlty bought Atsamd21-Xplained board from Atmel and trying to get multiple pins ADC using ASF4 and with Atmel Start. While i was exploring the concept of ADC on Samd21,i came up with Positive Mux Input Selection and Negative Mux Input Selection drop down menus while configuring ADC in Atmel Start
I have came with the information that these are used for inputting into ADC. But what is the purpose.?Why it's used.?How can i configure for a single pin ADC and Multiple.? My other question is : How can i read Analog values from multiple ADC pins on ATsamd21 with ASF4 and Atmel Start.