fix：

main.py

@@ -290,16 +290,14 @@ def cmd_str():
     last_avg_abs = 0
 
     def _flush_pressure_buf(reason: str):
-        if not config.AIR_PRESSURE_lOG:
-            return
         nonlocal pressure_buf, pressure_sum, pressure_min, pressure_max, pressure_t0_ms, logger, pressure_abs_sum, last_avg_abs
         if not pressure_buf:
             return
+        if config.AIR_PRESSURE_lOG:
             t1_ms = time.ticks_ms()
             n = len(pressure_buf)
             avg = (pressure_sum / n) if n else 0
             avg_abs = (pressure_abs_sum / n) if n else 0
-        # 一行输出：方便后处理画曲线；同时带上统计信息便于快速看波峰
             line = (
                 f"[气压批量] reason={reason} "
                 f"t0={pressure_t0_ms} t1={t1_ms} n={n} "
@@ -311,13 +309,14 @@ def cmd_str():
                 logger.debug(line)
             else:
                 print(line)
+            last_avg_abs = avg_abs
+        # 无论是否记录日志，都必须清空 buffer，否则内存泄漏
         pressure_buf = []
         pressure_sum = 0
         pressure_abs_sum = 0
         pressure_min = 4095
         pressure_max = 0
         pressure_t0_ms = None
-        last_avg_abs = avg_abs
 
     # 主循环：检测扳机触发 → 拍照 → 分析 → 上报
     while not app.need_exit():