diff --git a/inc/ultrasonic_driver.h b/inc/ultrasonic_driver.h
index 1544cf3..5f74bb5 100644
--- a/inc/ultrasonic_driver.h
+++ b/inc/ultrasonic_driver.h
@@ -35,4 +35,8 @@ void ultrasonic_config(void);
 void ultrasonic_peripheral_config(void);
 void ultrasonic_pwm_out_cycles(uint8_t cycles);
 
+
+void timer15_config(void);
+void recevice_exti_config(void);
+
 #endif //ULTRASONIC_DRIVER_H
diff --git a/src/gd32e23x_it.c b/src/gd32e23x_it.c
index ebea871..9f23683 100644
--- a/src/gd32e23x_it.c
+++ b/src/gd32e23x_it.c
@@ -115,4 +115,30 @@ void TIMER13_IRQHandler(void) {
         }
         led_status = !led_status;
     }
+}
+
+void TIMER15_IRQHandler(void) {
+    if (timer_interrupt_flag_get(TIMER15, TIMER_INT_FLAG_UP) == SET)
+    {
+        timer_interrupt_flag_clear(TIMER15, TIMER_INT_FLAG_UP);
+
+        exti_interrupt_enable(EXTI_0);
+        // timer_enable(TIMER14);
+
+        gpio_bit_toggle(GPIOA, GPIO_PIN_7);
+
+        timer_disable(TIMER15);
+    }
+}
+
+void EXTI0_1_IRQHandler(void) {
+    if (exti_interrupt_flag_get(EXTI_0) == SET)    {
+        exti_interrupt_flag_clear(EXTI_0);
+
+        gpio_bit_toggle(GPIOA, GPIO_PIN_5);
+
+        timer_event_software_generate(TIMER14, TIMER_EVENT_SRC_CH0G);
+
+        exti_interrupt_disable(EXTI_0);
+    }
 }
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
index ab4f325..53ba5f7 100644
--- a/src/main.c
+++ b/src/main.c
@@ -26,11 +26,12 @@ int main(void)
     systick_config();
     /* configure ultrasonic board hardware */
     ultrasonic_peripheral_config();
+    timer15_config();
 
 
     /* ---------- debug start ---------- */
 
-
+    recevice_exti_config();
 
 
 
diff --git a/src/ultrasonic_driver.c b/src/ultrasonic_driver.c
index 0da150b..e9f5ed5 100644
--- a/src/ultrasonic_driver.c
+++ b/src/ultrasonic_driver.c
@@ -30,7 +30,7 @@ void led_config(void)
 
     timer_auto_reload_shadow_enable(LED_TIMER);
     timer_interrupt_enable(LED_TIMER, TIMER_INT_UP);
-    nvic_irq_enable(LED_IRQ, 0);
+    nvic_irq_enable(LED_IRQ, 3);
     timer_enable(LED_TIMER);
 }
 
@@ -107,6 +107,8 @@ void ultrasonic_pwm_out_cycles(uint8_t cycles) {
     timer_channel_output_mode_config(US_TRAN_TIMER, US_TRAN_CH, TIMER_OC_MODE_PWM1);
     timer_enable(US_TRAN_TIMER);
 
+    timer_enable(TIMER15);
+
     while (current_cycle < cycles)
     {
         while (!timer_interrupt_flag_get(US_TRAN_TIMER, TIMER_INT_FLAG_UP));
@@ -120,3 +122,48 @@ void ultrasonic_pwm_out_cycles(uint8_t cycles) {
     //     gpio_bit_reset(GPIOB, GPIO_PIN_1);
     // }
 }
+
+void timer15_config(void) {
+    rcu_periph_clock_enable(RCU_GPIOA);
+
+    gpio_mode_set(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_7);
+    gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_7);
+    gpio_bit_write(GPIOA, GPIO_PIN_7, SET);
+
+    rcu_periph_clock_enable(RCU_TIMER15);
+    timer_deinit(TIMER15);
+
+    timer_parameter_struct timer_initpara;
+    timer_struct_para_init(&timer_initpara);
+    timer_initpara.prescaler         =71;
+    timer_initpara.alignedmode       =TIMER_COUNTER_EDGE;
+    timer_initpara.counterdirection  =TIMER_COUNTER_UP;
+    timer_initpara.period            =230 - 1;
+    timer_initpara.clockdivision     =TIMER_CKDIV_DIV1;
+    timer_initpara.repetitioncounter =0;
+    timer_init(TIMER15, &timer_initpara);
+
+    timer_auto_reload_shadow_enable(TIMER15);  //使能自动影子重载
+    timer_interrupt_enable(TIMER15, TIMER_INT_UP);  // 使能自动重载中断
+    nvic_irq_enable(TIMER15_IRQn, 2U);
+}
+
+void recevice_exti_config(void) {
+    rcu_periph_clock_enable(RCU_GPIOA);
+    rcu_periph_clock_enable(RCU_CFGCMP);
+
+    gpio_mode_set(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_5);
+    gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_5);
+    gpio_bit_write(GPIOA, GPIO_PIN_5, SET);
+
+    exti_deinit();
+
+    gpio_mode_set(GPIOA, GPIO_MODE_INPUT, GPIO_PUPD_NONE, GPIO_PIN_0);
+    nvic_irq_enable(EXTI0_1_IRQn, 1U);
+    syscfg_exti_line_config(EXTI_SOURCE_GPIOA, EXTI_SOURCE_PIN0);
+
+    exti_init(EXTI_0, EXTI_INTERRUPT, EXTI_TRIG_FALLING);
+    exti_flag_clear(EXTI_0);
+
+    exti_interrupt_enable(EXTI_0);
+}