dummy burst ADC capture 추가

src/measurement/piezo_measure.c

@@ -223,6 +223,13 @@ int piezo_measure_sweep(void)
                 k_busy_wait(PIEZO_AVG_INTER_BURST_GAP_US);
                 piezo_burst_sw((uint8_t)cfg->cycles);
                 k_busy_wait(capture_delay_us);
+
+                err = echo_adc_capture(echo_capture, cfg->samples);
+                if (err)
+                {
+                    DBG_PRINTF("[ECHO] dummy capture fail ch=%d dummy=%d err=%d\r\n", ch, dummy, err);
+                    return ECHO_STATUS_CAPTURE;
+                }
             }
 
             // 마지막 dummy capture와 첫 real capture 사이에도 같은 회복 시간