Piezo power off 타이밍 조정

- 기존: 커맨드 핸들러에서 응답 전송 후 off
- 변경: piezo sweep 직후 off

src/command/handlers/cmd_piezo.c

@@ -98,7 +98,7 @@ int cmd_mbb(const uint8_t *data, uint8_t data_len)
     cmd_send_response_u16("raa:", (uint16_t)status); // 최종 상태 raa: 전송
     DBG_PRINTF("[CMD] mbb status=0x%04X\r\n", status);
 
-    piezo_power_off();
+    //piezo_power_off();
     processing = false;
     return 1;
 }
@@ -187,7 +187,7 @@ int cmd_mtb(const uint8_t *data, uint8_t data_len)
 
     DBG_PRINTF("[CMD] mtb status=0x%04X rim=%u\r\n", status, rim_count);
 
-    piezo_power_off();
+    //piezo_power_off();
     processing = false;
     return 1;
 }
@@ -278,7 +278,7 @@ int cmd_maa(const uint8_t *data, uint8_t data_len)
         }
     }
 
-    piezo_power_off();
+    //piezo_power_off();
     cmd_send_response_u16("raa:", (uint16_t)status); // 최종 상태 raa: 전송
     DBG_PRINTF("[CMD] maa status=0x%04X\r\n", status);
 

src/measurement/piezo_measure.c

@@ -39,10 +39,10 @@
 #define PIEZO_AVG_INTER_BURST_GAP_US 500
 
 /* real capture 전에 같은 채널에서 버스트+ADC capture를 버리는 횟수(dummy) */
-#define PIEZO_DUMMY_CAPTURE_COUNT    1
+#define PIEZO_DUMMY_CAPTURE_COUNT    3
 
 /* 채널 0 시작 전 안정을 위한 추가 딜레이 */
-#define PIEZO_CH0_WARMUP_TO_REAL_SETTLE_US 2000
+#define PIEZO_CH0_WARMUP_TO_REAL_SETTLE_US 500
 
 /* 6채널 sweep 결과 (각 채널의 평균 완료 후 최종만 저장) */
 static uint16_t piezo_channels[PIEZO_NUM_CHANNELS][PIEZO_MEASURE_MAX_SAMPLES];
@@ -215,6 +215,7 @@ int piezo_measure_sweep(void)
         if (err)
         {
             DBG_ERR("[PIEZO] mux fail ch=%d err=%d\r\n", ch, err);
+            piezo_power_off();
             return ECHO_STATUS_MUX;
         }
 
@@ -225,6 +226,7 @@ int piezo_measure_sweep(void)
         if (err)
         {
             DBG_ERR("[ECHO] dummy read fail ch=%d err=%d\r\n", ch, err);
+            piezo_power_off();
             return ECHO_STATUS_CAPTURE;
         }
         
@@ -232,15 +234,19 @@ int piezo_measure_sweep(void)
         {
             piezo_power_on();
             k_msleep(PIEZO_POWER_STABILIZE_MS);
-            k_busy_wait(PIEZO_AVG_INTER_BURST_GAP_US);
-            piezo_burst_sw_freq(freq, cycles);
-            k_busy_wait(capture_delay_us);
-            err = echo_adc_capture(echo_capture, samples);
 
-            if (err)
+            for (uint8_t dummy = 0; dummy < PIEZO_DUMMY_CAPTURE_COUNT; dummy++)
             {
-                DBG_ERR("[ECHO] dummy capture fail ch=%d err=%d\r\n", ch, err);
-                return ECHO_STATUS_CAPTURE;
+                k_busy_wait(PIEZO_AVG_INTER_BURST_GAP_US);
+                piezo_burst_sw_freq(freq, cycles);
+                k_busy_wait(capture_delay_us);
+                err = echo_adc_capture(echo_capture, samples);
+                if (err)
+                {
+                    DBG_ERR("[ECHO] dummy capture fail ch=%d err=%d\r\n", ch, err);
+                    piezo_power_off();
+                    return ECHO_STATUS_CAPTURE;
+                }
             }
 
             // 마지막 dummy capture와 첫 real capture 사이에도 같은 회복 시간 + 추가 안정화
@@ -268,6 +274,7 @@ int piezo_measure_sweep(void)
             if (err)
             {
                 DBG_ERR("[ECHO] capture fail ch=%d avg=%d err=%d\r\n", ch, a, err);
+                piezo_power_off();
                 return ECHO_STATUS_CAPTURE;
             }
 
@@ -287,6 +294,9 @@ int piezo_measure_sweep(void)
         //DBG_PRINTF("[SWEEP] ch=%d done\r\n", ch);
     }
 
+    // 6채널 ADC capture가 모두 끝난 직후 전원 off (BLE 전송 전에 끊기)
+    piezo_power_off();
+
     //DBG_PRINTF("[SWEEP] done\r\n");
     return ECHO_STATUS_OK;
 }