diff --git a/src/main.c b/src/main.c
index 6833383..030701d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -13,7 +13,7 @@
 #include "ultrasonic_driver.h"
 
 #define ULTRASONIC_CYCLES     0x05U
-#define ULTRASONIC_TRAN_US    1000  // (ms)
+#define ULTRASONIC_TRAN_US    50  // (ms)
 
 extern uint32_t capture_value;
 
@@ -33,7 +33,7 @@ int main(void)
 
 
     /* ---------- debug start ---------- */
-    ultrasonic_transmit_delay(240);
+    ultrasonic_transmit_delay(250);
     recevice_exti_config();
     ultrasonic_echo_timer_config();
 
diff --git a/src/ultrasonic_driver.c b/src/ultrasonic_driver.c
index fa96338..b79287e 100644
--- a/src/ultrasonic_driver.c
+++ b/src/ultrasonic_driver.c
@@ -176,7 +176,7 @@ void ultrasonic_echo_timer_config(void)
     timer_icinitpara.icpolarity = TIMER_IC_POLARITY_BOTH_EDGE;
     timer_icinitpara.icselection = TIMER_IC_SELECTION_INDIRECTTI;
     timer_icinitpara.icprescaler = TIMER_IC_PSC_DIV1;
-    timer_icinitpara.icfilter = 0x0A; // 设置滤波器
+    timer_icinitpara.icfilter = 0x03; // 设置滤波器
     timer_input_capture_config(TIMER16, TIMER_CH_0, &timer_icinitpara);
 
     // timer_enable(TIMER16);