vadc_do_conversion
ret = vadc_do_conversion(vadc, prop, &read_1);
ret = vadc_do_conversion(vadc, prop, &read_2);
ret = vadc_do_conversion(vadc, prop, &read_1);
ret = vadc_do_conversion(vadc, prop, &read_2);
ret = vadc_do_conversion(vadc, prop, &adc_code);
ret = vadc_do_conversion(vadc, prop, &adc_code);