#define SAMD21_ADC_SWTRIG_START 1
#define SAMD21_ADC_INPUTCTRL_MUXPOS 0
+# define SAMD21_ADC_INPUTCTRL_MUXPOS_TEMP 0x18
# define SAMD21_ADC_INPUTCTRL_MUXPOS_BANDGAP 0x19
# define SAMD21_ADC_INPUTCTRL_MUXPOS_SCALEDCOREVCC 0x1a
# define SAMD21_ADC_INPUTCTRL_MUXPOS_SCALEDIOVCC 0x1b