diff --git a/.vscode/settings.json b/.vscode/settings.json
index 30b0640..e37bc0d 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -113,7 +113,8 @@
         "device_version_info_mgr.h": "c",
         "heart_wave_sample_service_cfg.h": "c",
         "filter.h": "c",
-        "filters.h": "c"
+        "filters.h": "c",
+        "nrfx_rtc.h": "c"
     },
     "files.encoding": "gbk"
 }
\ No newline at end of file
diff --git a/app/config/sdk_config.h b/app/config/sdk_config.h
index 12bab3d..c380b27 100644
--- a/app/config/sdk_config.h
+++ b/app/config/sdk_config.h
@@ -6130,7 +6130,7 @@
 
 
 #ifndef WDT_CONFIG_RELOAD_VALUE
-#define WDT_CONFIG_RELOAD_VALUE 5000
+#define WDT_CONFIG_RELOAD_VALUE 10000
 #endif
 
 // <o> WDT_CONFIG_IRQ_PRIORITY  - Interrupt priority
diff --git a/app/src/basic/watch_dog.c b/app/src/basic/watch_dog.c
new file mode 100644
index 0000000..fb0f663
--- /dev/null
+++ b/app/src/basic/watch_dog.c
@@ -0,0 +1,17 @@
+/*********************************************************************
+ * INCLUDES
+ */
+#include "nrf_drv_wdt.h"
+nrf_drv_wdt_channel_id m_channel_id;
+
+void wd_init() {
+  // WDT_CONFIG_RELOAD_VALUE 修改这个数值修改喂狗周期,单位ms
+  nrf_drv_wdt_config_t config = NRF_DRV_WDT_DEAFULT_CONFIG;
+  config.reload_value         = WDT_CONFIG_RELOAD_VALUE;
+  ret_code_t err_code         = nrf_drv_wdt_init(&config, NULL);
+  ZERROR_CHECK(err_code);
+  err_code = nrf_drv_wdt_channel_alloc(&m_channel_id);
+  ZERROR_CHECK(err_code);
+  nrf_drv_wdt_enable();
+}
+void wd_feed() { nrfx_wdt_feed(); }
\ No newline at end of file
diff --git a/app/src/board/board.h b/app/src/board/board.h
index 56124a0..1836f83 100644
--- a/app/src/board/board.h
+++ b/app/src/board/board.h
@@ -77,5 +77,3 @@
 #define APP_LOW_BATTERY_WARNING_LIMIT  10  // 低电量事件上报阈值
 
 #define BLE_UNCONNECTED_OVERTIME_S 300  // 蓝牙未连接_心跳超时判定时间 300s
-
-#define ENABLE_AUTO_STOP_WHEN_BLE_DISCONNECTED 1  // 蓝牙断开自动停止采集
\ No newline at end of file
diff --git a/app/src/device_ctrl_service.c b/app/src/device_ctrl_service.c
index f1ef22f..8bdf756 100644
--- a/app/src/device_ctrl_service.c
+++ b/app/src/device_ctrl_service.c
@@ -32,6 +32,7 @@ device_state_t DeviceCtrl_now_state();
 static void state_machine_driver_tmr_cb(void* p_context) {  //
   static app_event_t appevent;
   appevent.eventType = kevent_tmr_scheduler;
+  wd_feed();
   AppEvent_pushEvent(&appevent);
 }
 /**
@@ -237,12 +238,6 @@ static void app_event_listener(void* p_event_data, uint16_t event_size) {  //
       ZLOGI("stop sample because low battery");
       stopcapture = true;
     }
-#ifdef ENABLE_AUTO_STOP_WHEN_BLE_DISCONNECTED
-    else if (zdatachannel_last_rx_data_haspassed_s() > BLE_UNCONNECTED_OVERTIME_S) {
-      ZLOGI("stop sample because ble unconnected");
-      stopcapture = true;
-    }
-#endif
 
     if (stopcapture) {
       // 关闭文件
@@ -269,6 +264,9 @@ static void app_event_listener(void* p_event_data, uint16_t event_size) {  //
 void DeviceCtrl_startSample(int duration_s) {
   ZLOGI("start sample %d", duration_s);
   m_sample_duration_ms = duration_s * 1000;
+  if (duration_s == 0) {
+    m_sample_duration_ms = 2 * 60 * 1000;  // 两分钟
+  }
   static app_event_t event;
   event.eventType = kevent_start_sample_cmd_event;
   AppEvent_pushEvent(&event);
@@ -319,6 +317,8 @@ void DeviceCtrl_init() {
   // 切换到待机状态
   prvf_change_to_ready_state();
 
+  wd_init();
+
   ZERROR_CHECK(app_timer_create(&m_state_machine_driver_tmr, APP_TIMER_MODE_REPEATED, state_machine_driver_tmr_cb));
   ZERROR_CHECK(app_timer_start(m_state_machine_driver_tmr, APP_TIMER_TICKS(100), NULL));  // 200HZ采样
 }
diff --git a/app/src/heart_wave_sample_service.c b/app/src/heart_wave_sample_service.c
index 6235ac7..2e46753 100644
--- a/app/src/heart_wave_sample_service.c
+++ b/app/src/heart_wave_sample_service.c
@@ -432,14 +432,14 @@ static void ads1293_sample_one_frame() {
   static uint32_t sample[6];
 
 #if 1
-  ads1293_read_ecgs(&m_ads1293_1, &sample[3]);
+  // ads1293_read_ecgs(&m_ads1293_1, &sample[3]);
 #if CHANNEL_NUM == 2
-  ads1293_read_ecgs(&m_ads1293_0, &sample[0]);
+  // ads1293_read_ecgs(&m_ads1293_0, &sample[0]);
 #endif
 #endif
-  // ads1293_read_ecg(&m_ads1293_1, 1, &sample[SENSOR1_ID]);
-  // ads1293_read_ecg(&m_ads1293_1, 2, &sample[SENSOR2_ID]);
-  // ads1293_read_ecg(&m_ads1293_0, 1, &sample[SENSOR0_ID]);
+  ads1293_read_ecg(&m_ads1293_1, 1, &sample[SENSOR1_ID]);
+  ads1293_read_ecg(&m_ads1293_1, 2, &sample[SENSOR2_ID]);
+  ads1293_read_ecg(&m_ads1293_0, 1, &sample[SENSOR0_ID]);
 
   // medianFilter
 
diff --git a/libznordic b/libznordic
index f6a9d8d..2e93f83 160000
--- a/libznordic
+++ b/libznordic
@@ -1 +1 @@
-Subproject commit f6a9d8d2a92bb3a1ce00df2a316bd602bf579b20
+Subproject commit 2e93f83bd44b54f4b6bec2d338d674e7a884bd42