diff --git a/app/main.c b/app/main.c
index 98a0903..9d05891 100644
--- a/app/main.c
+++ b/app/main.c
@@ -313,7 +313,7 @@ void main() {
   znordic_loop();
 }
 #endif
-#if 1
+#if 0
 /*******************************************************************************
  *                             3导联-ADS1293-测试                              *
  *******************************************************************************/
@@ -321,7 +321,7 @@ void main() {
 static void test_tx_timer_cb(void* p_context) {
   static uint32_t data;
   data++;
-  ZLOGI("tim cb %d :%d", data,ThreeLeadECG_ready_pin_state_get());
+  ZLOGI("tim cb %d :%d %d", data, ThreeLeadECG_ready_pin_state_get(), ThreeLeadECG_LineInputDet_get_state());
   // ThreeLeadECG_sdcard_connect2_ext_usb_sdcard_driver_ic_reset();
 }
 
@@ -331,11 +331,11 @@ APP_TIMER_DEF(m_test_tx_timer);
 void main() {
   APP_SCHED_INIT(APP_TIMER_SCHED_EVENT_DATA_SIZE, 20);
 
-
   // ThreeLeadECG_sdcard_base_init();
   znordic_init();
 
   ThreeLeadECG_ecg_init();
+  ThreeLeadECG_LineInputDet_init();
 
   NRF_LOG_INFO("compile time :%s %d", __TIME__, APP_TIMER_TICKS(100));
   ZERROR_CHECK(app_timer_create(&m_test_tx_timer, APP_TIMER_MODE_REPEATED, test_tx_timer_cb));
@@ -400,4 +400,32 @@ void main() {
   ZERROR_CHECK(app_timer_start(m_test_tx_timer, APP_TIMER_TICKS(100), NULL));
   znordic_loop();
 }
+#endif
+
+#if 1
+/*******************************************************************************
+ *                                3导联-flash测试                                *
+ *******************************************************************************/
+static void test_tx_timer_cb(void* p_context) {
+  static uint32_t data;
+  data++;
+}
+
+extern uint32_t g_nrf_log_tx_pin;
+APP_TIMER_DEF(m_test_tx_timer);
+
+void main() {
+  APP_SCHED_INIT(APP_TIMER_SCHED_EVENT_DATA_SIZE, 20);
+  znordic_init();
+
+  NRF_LOG_INFO("compile time :%s %d", __TIME__, APP_TIMER_TICKS(100));
+  NRF_LOG_INTERNAL_FLUSH();
+
+  ThreeLeadECG_sdcard_base_init();
+  ThreeLeadECG_sdcard_mount();
+
+  ZERROR_CHECK(app_timer_create(&m_test_tx_timer, APP_TIMER_MODE_REPEATED, test_tx_timer_cb));
+  ZERROR_CHECK(app_timer_start(m_test_tx_timer, APP_TIMER_TICKS(100), NULL));
+  znordic_loop();
+}
 #endif
\ No newline at end of file
diff --git a/app/src/three_lead/three_lead_board.c b/app/src/three_lead/three_lead_board.c
index 0779754..69e2de8 100644
--- a/app/src/three_lead/three_lead_board.c
+++ b/app/src/three_lead/three_lead_board.c
@@ -40,6 +40,8 @@
 #define ADS1293_SPI_CS1_PIN  29
 #define ADS1293_READY_PIN    31
 
+#define LINE_DET_PIN 10
+
 /*******************************************************************************
  *                                    TOOLS                                    *
  *******************************************************************************/
@@ -149,17 +151,17 @@ void ThreeLeadECG_sdcard_base_init() {  //
    * @brief USBDRIVER_IC_RESET_PIN ctrl pin
    */
   znrf_gpio_cfg_output(SDCARD_USBDRIVER_IC_RESET_PIN, NRF_GPIO_PIN_NOPULL);
-  nrf_gpio_pin_set(SDCARD_USBDRIVER_IC_RESET_PIN);
+  nrf_gpio_pin_write(SDCARD_USBDRIVER_IC_RESET_PIN, 1);
   /**
    * @brief 初始化 SDCARD_USBDRIVER_IC_JUNCTION_CTRL_NOE_PIN
    */
   znrf_gpio_cfg_output(SDCARD_USBDRIVER_IC_JUNCTION_CTRL_NOE_PIN, NRF_GPIO_PIN_NOPULL);
-  nrf_gpio_pin_clear(SDCARD_USBDRIVER_IC_JUNCTION_CTRL_NOE_PIN);  // OE = 0
+  nrf_gpio_pin_write(SDCARD_USBDRIVER_IC_JUNCTION_CTRL_NOE_PIN, 0);  // OE = 0
   /**
    * @brief SDCARD电源控制引脚
    */
   znrf_gpio_cfg_output(SDCARD_POWER_CTRL_PIN, NRF_GPIO_PIN_NOPULL);
-  nrf_gpio_pin_clear(SDCARD_POWER_CTRL_PIN);  // POWER = 0
+  nrf_gpio_pin_write(SDCARD_POWER_CTRL_PIN, 0);  // POWER = 0
 }
 void ThreeLeadECG_sdcard_connect2_ext_usb_sdcard_driver_ic_reset() {
   nrf_gpio_pin_clear(SDCARD_USBDRIVER_IC_RESET_PIN);
@@ -167,7 +169,7 @@ void ThreeLeadECG_sdcard_connect2_ext_usb_sdcard_driver_ic_reset() {
   nrf_gpio_pin_set(SDCARD_USBDRIVER_IC_RESET_PIN);
 }
 void ThreeLeadECG_sdcard_connect2_ext_usb_sdcard_driver_ic(bool connect) {
-  if (connect) {
+  if (!connect) {
     nrf_gpio_pin_clear(SDCARD_USBDRIVER_IC_JUNCTION_CTRL_NOE_PIN);
   } else {
     nrf_gpio_pin_set(SDCARD_USBDRIVER_IC_JUNCTION_CTRL_NOE_PIN);
@@ -214,7 +216,7 @@ NRF_BLOCK_DEV_SDC_DEFINE(m_block_dev_sdc,
 static FATFS fs;
 
 void sdcard_test_write_text() {
-#define FILE_NAME "/5.TXT"
+#define FILE_NAME "/6.TXT"
   static FIL     file;
   uint32_t       bytes_written;
   static DIR     dir;
@@ -243,22 +245,39 @@ void sdcard_test_write_text() {
     }
   } while (fno.fname[0]);
   NRF_LOG_RAW_INFO("");
+  NRF_LOG_INFO("read from file " FILE_NAME "...");
+  {
+    ff_result = f_open(&file, FILE_NAME, FA_READ);
+    if (ff_result == FR_OK) {
+      static char rxbuf[20] = {0};
+      UINT        rxsize;
+      ff_result = f_read(&file, rxbuf, 19, &rxsize);
+      if (ff_result != FR_OK) {
+        NRF_LOG_INFO("read failed\r\n.");
+      } else {
+        NRF_LOG_INFO("read %s(%d)", rxbuf, rxsize);
+      }
+      (void)f_close(&file);
+    }
+  }
 
   NRF_LOG_INFO("Writing to file " FILE_NAME "...");
-  ff_result = f_open(&file, FILE_NAME, FA_CREATE_ALWAYS | FA_READ | FA_WRITE | FA_CREATE_NEW);
-  if (ff_result != FR_OK) {
-    NRF_LOG_INFO("Unable to open or create file: " FILE_NAME ". %d", ff_result);
-    return;
-  }
+  {
+    ff_result = f_open(&file, FILE_NAME, FA_CREATE_ALWAYS | FA_READ | FA_WRITE);
+    if (ff_result != FR_OK) {
+      NRF_LOG_INFO("Unable to open or create file: " FILE_NAME ". %d", ff_result);
+      return;
+    }
 
-  ff_result = f_write(&file, "iflytop", sizeof("iflytop") - 1, (UINT*)&bytes_written);
-  if (ff_result != FR_OK) {
-    NRF_LOG_INFO("Write failed\r\n.");
-  } else {
-    NRF_LOG_INFO("%d bytes written.", bytes_written);
-  }
+    ff_result = f_write(&file, "iflytop", sizeof("iflytop") - 1, (UINT*)&bytes_written);
+    if (ff_result != FR_OK) {
+      NRF_LOG_INFO("Write failed\r\n.");
+    } else {
+      NRF_LOG_INFO("%d bytes written.", bytes_written);
+    }
 
-  (void)f_close(&file);
+    (void)f_close(&file);
+  }
 }
 bool mountsuc = false;
 /**
@@ -293,9 +312,9 @@ void ThreeLeadECG_sdcard_mount() {
    *  4. 初始化SPI引脚，驱动flash
    */
 
-  // ThreeLeadECG_sdcard_flash_power_ctrl(false);
-  // ThreeLeadECG_sdcard_connect2_ext_usb_sdcard_driver_ic(false);
-  // ThreeLeadECG_sdcard_flash_power_ctrl(true);
+  nrf_gpio_pin_write(SDCARD_POWER_CTRL_PIN, 1);  // 关
+  nrf_gpio_pin_write(SDCARD_USBDRIVER_IC_JUNCTION_CTRL_NOE_PIN, 1);
+  nrf_gpio_pin_write(SDCARD_POWER_CTRL_PIN, 0);  // 开
 
   /**
    * @brief
@@ -329,6 +348,7 @@ void ThreeLeadECG_sdcard_mount() {
       NRF_LOG_INFO("Mount failed.");
       return;
     }
+    ZLOGI("Mount success");
 
     uint32_t blocks_per_mb = (1024uL * 1024uL) / m_block_dev_sdc.block_dev.p_ops->geometry(&m_block_dev_sdc.block_dev)->blk_size;
     uint32_t capacity      = m_block_dev_sdc.block_dev.p_ops->geometry(&m_block_dev_sdc.block_dev)->blk_count / blocks_per_mb;
@@ -408,4 +428,10 @@ void ThreeLeadECG_ecg_init() {
   revid = ads1293_spi_readreg(&m_ads1293_1, TI_ADS1293_REVID_REG);
   NRF_LOG_INFO("ads1293_1 revid: %d", revid);
 }
-bool ThreeLeadECG_ready_pin_state_get() { return nrf_gpio_pin_read(ADS1293_READY_PIN); }
+uint32_t ThreeLeadECG_ready_pin_state_get() { return nrf_gpio_pin_read(ADS1293_READY_PIN); }
+
+void ThreeLeadECG_LineInputDet_init() {
+  // LINE_DET_PIN
+  nrf_gpio_cfg_input(LINE_DET_PIN, NRF_GPIO_PIN_PULLUP);
+}
+uint32_t ThreeLeadECG_LineInputDet_get_state() { return nrf_gpio_pin_read(LINE_DET_PIN); }
diff --git a/app/src/three_lead/three_lead_board.h b/app/src/three_lead/three_lead_board.h
index ac9d1ac..1daa59e 100644
--- a/app/src/three_lead/three_lead_board.h
+++ b/app/src/three_lead/three_lead_board.h
@@ -45,5 +45,8 @@ void ThreeLeadECG_sdcard_umount();
 /*******************************************************************************
  *                                     ECG                                     *
  *******************************************************************************/
-void ThreeLeadECG_ecg_init();
-bool ThreeLeadECG_ready_pin_state_get();
+void     ThreeLeadECG_ecg_init();
+uint32_t ThreeLeadECG_ready_pin_state_get();
+//
+void     ThreeLeadECG_LineInputDet_init();
+uint32_t ThreeLeadECG_LineInputDet_get_state();