내부 60초 주기 배터리 저전압/고온 점검

- 배터리 저전압(3500이하) 5회 이상 연속인 경우 전원 OFF
- IMU 온도 고온(40도 이상) 5회 이상 연속인 경우 전원 OFF

src/drivers/battery/battery_adc.c

@@ -21,6 +21,7 @@
 
 #include "battery_adc.h"
 #include "debug_print.h"
+#include "imu_i2c.h"
 #include "main.h"
 
 /*==============================================================================
@@ -42,6 +43,10 @@ volatile uint16_t info_batt = 0;
 static struct k_timer battery_timer;
 static struct k_work battery_work;
 static uint8_t low_battery_cnt = 0;
+static uint8_t high_temperature_cnt = 0;
+
+#define BATTERY_MONITOR_LIMIT_COUNT  5U
+#define HIGH_TEMPERATURE_CDEG        4000   /* 40.00 C */
 
 #define BATTERY_MONITOR_INTERVAL_MS  60000  /* 60초 주기 */
 
@@ -159,17 +164,48 @@ static void battery_work_handler(struct k_work *work)
         low_battery_cnt++;
         DBG_PRINTF("[BATT] LOW! cnt=%d mv=%d\r\n", low_battery_cnt, batt);
 
-        if (low_battery_cnt >= 10)
+        if (low_battery_cnt >= BATTERY_MONITOR_LIMIT_COUNT)
         {
             low_battery_cnt = 0;
-            DBG_PRINTF("[BATT] 10x low -> Power OFF\r\n");
+            DBG_PRINTF("[BATT] %ux low -> Power OFF\r\n", BATTERY_MONITOR_LIMIT_COUNT);
             sleep_mode_enter();
+            return;
         }
     }
     else
     {
         low_battery_cnt = 0;
     }
+
+    int16_t temp_cdeg = 0;
+    int temp_ret = imu_read_temperature_cdeg(&temp_cdeg);
+
+    if (temp_ret != 0)
+    {
+        DBG_PRINTF("[TEMP] IMU read failed ret=%d\r\n", temp_ret);
+        return;
+    }
+
+    if (temp_cdeg > HIGH_TEMPERATURE_CDEG)
+    {
+        high_temperature_cnt++;
+        DBG_PRINTF("[TEMP] HIGH! cnt=%d temp=%d.%02d C\r\n",
+                   high_temperature_cnt,
+                   temp_cdeg / 100,
+                   (temp_cdeg < 0 ? -temp_cdeg : temp_cdeg) % 100);
+
+        if (high_temperature_cnt >= BATTERY_MONITOR_LIMIT_COUNT)
+        {
+            high_temperature_cnt = 0;
+            DBG_PRINTF("[TEMP] %ux high -> Power OFF\r\n", BATTERY_MONITOR_LIMIT_COUNT);
+            sleep_mode_enter();
+            return;
+        }
+    }
+    else
+    {
+        high_temperature_cnt = 0;
+    }
 }
 
 /* 타이머 ISR → k_work 예약 */