diff --git a/user/main.c b/user/main.c
index e884df4..9a09343 100644
--- a/user/main.c
+++ b/user/main.c
@@ -30,12 +30,9 @@ void EXTI2_3_IRQHandler(void)
         
         /* 设置事件标志 */
         high_level_event = 1;
-        
-        /* 启动定时器，40ms后清除事件标志 */
-      //  timer_disable(TIMER14);
+        gpio_bit_set(GPIOF, GPIO_PIN_7);  // 测试用：置高PF7引脚
+        /* 看门狗式重置：每次中断重置定时器计数，40ms内无新中断才会溢出 */
         timer_counter_value_config(TIMER14, 0);
-			
-        timer_enable(TIMER14);
     }
 }
 
@@ -52,6 +49,9 @@ void TIMER14_IRQHandler(void)
         
         /* 清除事件标志 */
         high_level_event = 0;
+        gpio_bit_reset(GPIOF, GPIO_PIN_7);  // 测试用：置低PF7引脚
+        /* 测试用：翻转PF7引脚,用于验证定时器周期 */
+        // gpio_bit_toggle(GPIOF, GPIO_PIN_7);
 			
     }
 }
@@ -83,6 +83,14 @@ void exti_pa3_config(void)
 /* 配置定时器1 */
 void timer14_config(void)
 {
+    /* 使能GPIOF时钟 */
+    rcu_periph_clock_enable(RCU_GPIOF);
+
+    /* 配置PF7为推挽输出，用于测试定时器周期 */
+    gpio_mode_set(GPIOF, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_7);
+    gpio_output_options_set(GPIOF, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_7);
+    gpio_bit_reset(GPIOF, GPIO_PIN_7);  // 初始化为低电平
+
     /* 使能定时器14时钟 */
     rcu_periph_clock_enable(RCU_TIMER14);
     
@@ -92,12 +100,11 @@ void timer14_config(void)
     /* 定时器配置 */
     timer_parameter_struct timer_initpara;
     timer_struct_para_init(&timer_initpara);
-    
-    /* 系统时钟为48MHz，预分频48，计数到40000，产生40ms中断 */
-    timer_initpara.prescaler         = 71999;  // 72MHz / 72000 = 1kHz
+
+    timer_initpara.prescaler         = 719;  // 72MHz / 720 = 100kHz
     timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;
     timer_initpara.counterdirection  = TIMER_COUNTER_UP;
-    timer_initpara.period            = 199;     // 40ms (0~39)
+    timer_initpara.period            = 3999;     // 40ms @ 100kHz
     timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;
     timer_initpara.repetitioncounter = 0;
     timer_init(TIMER14, &timer_initpara);