diff --git a/Src/command.c b/Src/command.c
index f7a3980..b11b654 100644
--- a/Src/command.c
+++ b/Src/command.c
@@ -18,6 +18,7 @@
 #include "board_config.h"
 #include "gd32e23x_usart.h"
 #include "ultrasonic_analog.h"
+#include "systick.h"
 
 /* ============================================================================
  * 协议格式说明
@@ -255,15 +256,17 @@ void handle_command(const uint8_t *frame, uint8_t len) {
         switch (base_cmd) {
             case 1u: // M1: enable sensor report
                 // g_ultrasonic_measure_done = false;
+                gpio_bit_toggle(GPIOA, GPIO_PIN_0);
                 ultrasonic_pwm_out_cycles();
+
+                delay_ms(2); // TODO: 模拟超声结果等待延时
+
                 gpio_bit_toggle(GPIOA, GPIO_PIN_0);
 
-                while (g_ultrasonic_measure_done)
-                {
-                    g_ultrasonic_measure_done = false;
-                    send_response(RESP_TYPE_OK, s_report_status_err, sizeof(s_report_status_err));
-                    return;
-                }
+                // g_ultrasonic_measure_done = false;
+                send_response(RESP_TYPE_OK, s_report_status_err, sizeof(s_report_status_err));
+                return;
+
                 
                 
                 
diff --git a/Src/gd32e23x_it.c b/Src/gd32e23x_it.c
index 1712db6..ac2705c 100644
--- a/Src/gd32e23x_it.c
+++ b/Src/gd32e23x_it.c
@@ -39,8 +39,6 @@ OF SUCH DAMAGE.
 #include "led.h"
 #include "ultrasonic_analog.h"
 
-extern uint16_t g_capture_value;
-
 /*!
     \brief      this function handles NMI exception
     \param[in]  none
@@ -147,7 +145,7 @@ void EXTI0_1_IRQHandler(void) {
     if (exti_interrupt_flag_get(US_RX_GPIO_EXTI) == SET)
     {
         exti_interrupt_flag_clear(US_RX_GPIO_EXTI);
-        g_capture_value = timer_channel_capture_value_register_read(US_ECHO_TIMER, US_ECHO_CH);
+        // g_capture_value = timer_channel_capture_value_register_read(US_ECHO_TIMER, US_ECHO_CH);
         
         timer_disable(US_ECHO_TIMER);
         exti_interrupt_disable(US_RX_GPIO_EXTI);
diff --git a/Src/main.c b/Src/main.c
index fbc34bd..8ddfe26 100644
--- a/Src/main.c
+++ b/Src/main.c
@@ -42,8 +42,6 @@ OF SUCH DAMAGE.
 #include "board_config.h"
 #include "ultrasonic_analog.h"
 
-volatile uint16_t g_capture_value;
-
 /*!
     \brief      main function
     \param[in]  none
diff --git a/Src/ultrasonic_analog.c b/Src/ultrasonic_analog.c
index 957346e..8fac0f0 100644
--- a/Src/ultrasonic_analog.c
+++ b/Src/ultrasonic_analog.c
@@ -6,7 +6,6 @@
 #include "systick.h"
 
 volatile bool g_ultrasonic_measure_done = false;
-extern uint32_t g_capture_value;
 
 void ultrasonic_tx_init(void) {
 
@@ -73,7 +72,9 @@ void ultrasonic_pwm_out_cycles(void) {
     timer_channel_output_state_config(TIMER13, TIMER_CH_0, TIMER_CCX_ENABLE);
 
     timer_enable(US_TX_TIMER);
-    timer_enable(TIMER15);
+
+    // TODO 启动后续回波计时器
+    // timer_enable(TIMER15);
 
 }