struct adc_module adc_instance;
struct
adc_config config_adc;
adc_get_config_defaults(&config_adc);
#if (SAMC21)
adc_init(&adc_instance, ADC1, &config_adc);
#else
adc_init(&adc_instance, ADC, &config_adc);
#endif
adc_enable(&adc_instance);