diff --git a/README.md b/README.md
index 38d886e..e4897c9 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,12 @@
 
 ```
 
+V12:
+    1. 修复上传后，不关闭文件描述符的BUG
+    2. 添加导联线未插入状态下，开始检测指令回复错误码的功能。
+
+
+
 # TODO:
 修改蓝牙测试Server程序，测试程序蓝牙名称过滤标志为 iflytop_ble_test_device OK
 修改蓝牙名称生成规则，规则为，当device_id为0或者全F，蓝牙名称为iflytop_ble_test_device，否则蓝牙名称为产品SN码 OK
diff --git a/app/src/app_ble_service.c b/app/src/app_ble_service.c
index 60013c0..093bc77 100644
--- a/app/src/app_ble_service.c
+++ b/app/src/app_ble_service.c
@@ -260,6 +260,12 @@ int RecordUpload_stop_upload() {
   m_isupload_data_state = false;
   SampleDataMgr_changeToExtMode();
   app_timer_stop(m_record_upload_tmr);
+
+  if (m_upload_fd > 0) {
+    SampleDataMgr_close(m_upload_fd);
+    m_upload_fd = 0;
+  }
+
   return 0;
 }
 bool RecordUpload_is_uploading() { return m_isupload_data_state; }
@@ -364,6 +370,12 @@ static void prvf_process_ble_rx_data(void* p_event_data, uint16_t len) {
     if (RecordUpload_is_uploading()) {
       ZLOGI("uploading,can not start capture");
       send_error_receipt(rxheader, kifyhrs_ecode_device_busy);
+      return;
+    }
+
+    if (!hwss_line_detect_get_state()) {
+      send_error_receipt(rxheader, kifyhrs_ecode_electrode_is_not_inserted);
+      return;
     }
 
     DeviceCtrl_startSample(0);
@@ -384,6 +396,12 @@ static void prvf_process_ble_rx_data(void* p_event_data, uint16_t len) {
     if (RecordUpload_is_uploading()) {
       ZLOGI("uploading,can not start capture");
       send_error_receipt(rxheader, kifyhrs_ecode_device_busy);
+      return;
+    }
+
+    if (!hwss_line_detect_get_state()) {
+      send_error_receipt(rxheader, kifyhrs_ecode_electrode_is_not_inserted);
+      return;
     }
 
     DeviceCtrl_startSample(capture_time_s);
diff --git a/app/src/basic/version.h b/app/src/basic/version.h
index afeda6d..c688909 100644
--- a/app/src/basic/version.h
+++ b/app/src/basic/version.h
@@ -2,7 +2,7 @@
 #define CATEGORY "M1002" // 三导联
 #define MANUFACTURER_NAME "iflytop"
 
-#define FIRMWARE_VERSION (11)
+#define FIRMWARE_VERSION (12)
 #define BLESTACK_VERSION 1
 #define BOOTLOADER_VERSION 1
 #define HARDWARE_VERSION (1)
diff --git a/app/src/device_ctrl_service.c b/app/src/device_ctrl_service.c
index 07045d9..c8c0014 100644
--- a/app/src/device_ctrl_service.c
+++ b/app/src/device_ctrl_service.c
@@ -158,6 +158,9 @@ static void app_event_listener(void* p_event_data, uint16_t event_size) {  //
   //  }
   //  ZLOGI("button %d", nrf_gpio_pin_read(BUTTON_PIN));
 
+  // hwss_line_detect_get_state
+  // ZLOGI("%d",hwss_line_detect_get_state());
+
   /*******************************************************************************
    *                              状态无关事件处理                               *
    *******************************************************************************/
diff --git a/app/src/heart_wave_sample_service.c b/app/src/heart_wave_sample_service.c
index 2e46753..bbe0fee 100644
--- a/app/src/heart_wave_sample_service.c
+++ b/app/src/heart_wave_sample_service.c
@@ -511,6 +511,8 @@ void hwss_init(void) {
     inConfig.sense                      = NRF_GPIOTE_POLARITY_HITOLO;            // 下降沿触发
     ZERROR_CHECK(nrfx_gpiote_in_init(ADS1293_READY_PIN, &inConfig, ads1293_ready_pin_irq));
   }
+
+  nrf_gpio_cfg_input(LINE_DET_PIN, NRF_GPIO_PIN_PULLUP);
 #else
   /**
    * @brief 初始化定时器
@@ -623,4 +625,9 @@ void hwss_stop_capture(void) {
 bool hwss_is_capturing(void) { return m_work_flag; }
 
 uint8_t hwss_get_drop_state0() { return m_lodstate0; }
-uint8_t hwss_get_drop_state1() { return m_lodstate1; }
\ No newline at end of file
+uint8_t hwss_get_drop_state1() { return m_lodstate1; }
+
+
+bool hwss_line_detect_get_state(){
+  return !nrf_gpio_pin_read(LINE_DET_PIN);
+}
diff --git a/app/src/heart_wave_sample_service.h b/app/src/heart_wave_sample_service.h
index a6d4d1b..9341e1f 100644
--- a/app/src/heart_wave_sample_service.h
+++ b/app/src/heart_wave_sample_service.h
@@ -35,3 +35,5 @@ uint32_t hwss_started_has_passed_s(void);
 
 uint8_t hwss_get_drop_state0();
 uint8_t hwss_get_drop_state1();
+
+bool hwss_line_detect_get_state();
diff --git a/ify_hrs_protocol b/ify_hrs_protocol
index da8e077..f2eae40 160000
--- a/ify_hrs_protocol
+++ b/ify_hrs_protocol
@@ -1 +1 @@
-Subproject commit da8e07706a41c157a3e42da3f69136f665f5a20f
+Subproject commit f2eae40f67048820f37dc5dd3585ca9a75156dfc