ADC_MUX_NONE = 0, // Nothing. return 0
ADC_MUX_NOISE, // Nothing. return something random
ADC_MUX_SINGLE, // Normal ADC pin reading
- ADC_MUX_DIFF, // differencial channels (src-diff)
+ ADC_MUX_DIFF, // differential channels (src-diff)
ADC_MUX_TEMP, // internal temp sensor
ADC_MUX_REF, // reference voltage (in src * 100)
ADC_MUX_VCC4, // VCC/4