TEST_TSEL_50
ret = iio_gts_find_gain_sel_for_scale_using_time(>s, TEST_TSEL_50, 0,
old_time_sel = TEST_TSEL_50;
#define TEST_TSEL_X_MIN TEST_TSEL_50
new_time_sel = TEST_TSEL_50;
old_time_sel = TEST_TSEL_50;
new_time_sel = TEST_TSEL_50;
GAIN_SCALE_ITIME_US(50 * 1000, TEST_TSEL_50, 1),