diff --git a/app/src/board/ads129x/ads129x.c b/app/src/board/ads129x/ads129x.c
index c5c92f9..6fdd24c 100644
--- a/app/src/board/ads129x/ads129x.c
+++ b/app/src/board/ads129x/ads129x.c
@@ -90,6 +90,9 @@ uint8_t ads129X_rw_reg(uint8_t cmd, uint8_t data) {
   return rx;
 }
 
+uint8_t ads129X_read_reg(uint8_t add) { return ads129X_rw_reg(ADS129X_COMMAND_RREG | add, 0); }
+void    ads129X_write_reg(uint8_t add, uint8_t data) { ads129X_rw_reg(ADS129X_COMMAND_WREG | add, data); }
+
 /* 从指定寄存器开始读写一定数量的寄存器 */
 void ads129X_write_multiregs(uint8_t reg, uint8_t* ch, uint8_t size) {
   uint8_t i;
@@ -170,6 +173,16 @@ static bool ads129x_write_reg(ads129x_regs_t* writeval) {
 /***********************************************************************************************************************
  *                                                       EXTERN                                                        *
  ***********************************************************************************************************************/
+void ads129x_read_data_loop() {
+  ads129x_capture_data_t capture_data;
+  while (true) {
+    while (ADS129X_DRDY_GET())
+      ;
+
+    ads129x_read_data(&capture_data);
+    ZLOGI("{%d} %x", capture_data.ch1data, capture_data.loffstate);
+  }
+}
 
 uint8_t ads129x_init() {
   /**
@@ -194,28 +207,8 @@ uint8_t ads129x_init() {
   nrf_gpio_pin_set(ADS1291_PWDN_PIN);
   nrf_delay_ms(2000);
 
-  ads129x_start_capture(true);
-  // char txdata[] = {1, 2, 3, 4};
-  while (true) /* 识别芯片型号，1291:0x52 */
-  {
-    uint8_t id = ads129X_rw_reg(ADS129X_COMMAND_RREG | ADS129X_REG_ID, 0);
-    // nrf_log_backend_uart_tx_raw(txdata, 4);
-    // znordic_force_flush_log();
-
-    ZLOGI("ads129X id: %x", id);
-    nrf_delay_ms(1000);
-  }
-}
-
-void ads129x_read_data_loop() {
-  ads129x_capture_data_t capture_data;
-  while (true) {
-    while (ADS129X_DRDY_GET())
-      ;
-
-    ads129x_read_data(&capture_data);
-    ZLOGI("{%d}", capture_data.ch0data);
-  }
+  ads129x_start_capture(false);
+  ads129x_read_data_loop();
 }
 
 uint8_t ads129x_start_capture(bool test) {
@@ -234,6 +227,15 @@ uint8_t ads129x_start_capture(bool test) {
   regcache.rld_sens  = 0x20;
   regcache.loff_sens = 0x03;
 
+  /* 导联脱落比较器开，内部2.42v参考电压 */
+  regcache.cfg2 = ADS129X_SET_BITS(regcache.cfg2, ADS129X_PDB_LOFF_COMP, ADS129X_PDB_LOFF_COMP_ON);
+  regcache.cfg2 = ADS129X_SET_BITS(regcache.cfg2, ADS129X_PDB_REFBUF, ADS129X_PDB_REFBUF_ON);
+  regcache.cfg2 = ADS129X_SET_BITS(regcache.cfg2, ADS129X_VREF_4V, ADS129X_VREF_2420MV);
+
+  /* 通道二导联脱落检测功能开 */
+  regcache.loff_sens = ADS129X_SET_BITS(regcache.loff_sens, ADS129X_LOFF2N, ADS129X_LOFF2N_ON);
+  regcache.loff_sens = ADS129X_SET_BITS(regcache.loff_sens, ADS129X_LOFF2P, ADS129X_LOFF2P_ON);
+
   if (test) {
     regcache.cfg2   = ADS129X_SET_BITS(regcache.cfg2, ADS129X_INT_TEST, ADS129X_INT_TEST_ON);
     regcache.cfg2   = ADS129X_SET_BITS(regcache.cfg2, ADS129X_INT_FREQ, ADS129X_INT_FREQ_AC);
@@ -246,8 +248,6 @@ uint8_t ads129x_start_capture(bool test) {
   port_delay_ms(10);
   ads129X_send_cmd(ADS129X_COMMAND_START); /* 发送开始数据转换（等效于拉高START引脚） */
   port_delay_ms(10);
-
-  ads129x_read_data_loop();
 }
 
 static int32_t i24toi32(uint8_t* p_i32) {
@@ -281,16 +281,23 @@ void ads129x_read_data(ads129x_capture_data_t* capture_data) {
    * 24bit ch1     MSB
    *
    */
-  capture_data->loffstate = rddata[0];
-  capture_data->gpio0     = rddata[0];
-  capture_data->gpio1     = rddata[0];
-  capture_data->ch0data   = i24toi32(&rddata[3]);
-  capture_data->ch1data   = i24toi32(&rddata[6]);
+  uint32_t status = (((uint32_t)rddata[0]) << 16) | (((uint32_t)rddata[1]) << 8) | ((uint32_t)rddata[2]);
+
+  capture_data->loffstate = (status >> (13 + 2)) & 0x1f;
+  capture_data->gpio0     = status >> (14);
+  capture_data->gpio1     = status >> (13);
+
+  capture_data->ch1data = i24toi32(&rddata[3]);
+  capture_data->ch2data = i24toi32(&rddata[6]);
+}
+
+uint8_t ads129x_get_lead_off_state() {
+  // FLIP2,FLIP1,LOFF2N,LOFF2P,LOFF1N,LOFF1P
+  uint8_t leadoffstate = ads129X_read_reg(ADS129X_REG_LOFFSTAT);
+  return leadoffstate;
 }
 
 uint8_t ads129x_enter_low_power_mode() { return 0; }
 uint8_t ads129x_enter_lead_off_detect_mode() { return 0; }
 
 uint8_t ads129x_data_is_ready() { return ADS129X_DRDY_GET(); }
-
-uint8_t ads129x_get_lead_off_state() { return 0; }
\ No newline at end of file
diff --git a/app/src/board/ads129x/ads129x.h b/app/src/board/ads129x/ads129x.h
index 408d687..9588d67 100644
--- a/app/src/board/ads129x/ads129x.h
+++ b/app/src/board/ads129x/ads129x.h
@@ -10,13 +10,9 @@ typedef struct {
   /**
    * @brief
    *
-   * loffstate:
-   *  bit4 RLD_STAT
-   *  bit3 IN2N_OFF
-   *  bit2 IN2P_OFF
-   *  bit1 IN1N_OFF
-   *  bit0 IN1P_OFF
-   *
+   * loffstate:[4:0] RLD_STAT IN2N_OFF IN2P_OFF IN1N_OFF IN1P_OFF
+   * ch1data: 有符号数据
+   * ch2data: 有符号数据
    */
 
   uint8_t loffstate;
@@ -24,8 +20,8 @@ typedef struct {
   uint8_t gpio0;
   uint8_t gpio1;
 
-  uint32_t ch0data;
   uint32_t ch1data;
+  uint32_t ch2data;
 } ads129x_capture_data_t;
 
 /**