ADC_FIFOC_RX_TRIG_LEVEL_SHIFT
#define ADC_FIFOC_RX_TRIG_LEVEL_MASK (0x1f << ADC_FIFOC_RX_TRIG_LEVEL_SHIFT)
(RX_TRIG_LEVEL << ADC_FIFOC_RX_TRIG_LEVEL_SHIFT));