diff --git a/bsp/wch/ch32v30x/driver/drv_timer.c b/bsp/wch/ch32v30x/driver/drv_timer.c
index 151bc4d..14a7d33 100644
--- a/bsp/wch/ch32v30x/driver/drv_timer.c
+++ b/bsp/wch/ch32v30x/driver/drv_timer.c
@@ -175,6 +175,13 @@ static int drv_timer_configure(struct mr_timer *timer, int state)
     /* Update timer clock(MHz) */
     timer->info->clk = pclk / 1000000;
 
+    /* Configure timer */
+    TIM_TimeBaseInitStructure.TIM_Period = 0;
+    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
+    TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
+    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
+    TIM_TimeBaseInit(timer_data->instance, &TIM_TimeBaseInitStructure);
+
     /* Configure NVIC */
     NVIC_InitStructure.NVIC_IRQChannel = timer_data->irq;
     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
@@ -182,13 +189,6 @@ static int drv_timer_configure(struct mr_timer *timer, int state)
     NVIC_InitStructure.NVIC_IRQChannelCmd = state;
     NVIC_Init(&NVIC_InitStructure);
     TIM_ITConfig(timer_data->instance, TIM_IT_Update, state);
-
-    /* Configure timer */
-    TIM_TimeBaseInitStructure.TIM_Period = 0;
-    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
-    TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
-    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
-    TIM_TimeBaseInit(timer_data->instance, &TIM_TimeBaseInitStructure);
     return MR_EOK;
 }
 
diff --git a/document/device/pin.md b/document/device/pin.md
index 58a45c5..0703cc6 100644
--- a/document/device/pin.md
+++ b/document/device/pin.md
@@ -84,8 +84,7 @@ int mr_dev_ioctl(int desc, int cmd, void *args);
 
 ```c
 /* 定义引脚编号 */
-#define
-PIN_NUMBER                      45
+#define PIN_NUMBER                      45
 
 /* 设置引脚编号 */
 mr_dev_ioctl(ds, MR_CTL_PIN_SET_NUMBER, mr_make_local(int, PIN_NUMBER));
@@ -118,8 +117,7 @@ mr_dev_ioctl(ds, MR_CTL_PIN_GET_NUMBER, &number);
 
 ```c
 /* 定义引脚模式 */
-#define
-PIN_MODE                        MR_PIN_MODE_OUTPUT
+#define PIN_MODE                        MR_PIN_MODE_OUTPUT
 
 /* 设置引脚模式 */
 mr_dev_ioctl(ds, MR_CTL_PIN_SET_MODE, mr_make_local(int, PIN_MODE));
@@ -177,7 +175,7 @@ int ret = mr_dev_read(ds, &pin_level, sizeof(pin_level));
 /* 是否读取成功 */
 if (ret != sizeof(pin_level))
 {
-return ret;
+    return ret;
 }
 ```
 
@@ -205,7 +203,7 @@ int ret = mr_dev_write(ds, &pin_level, sizeof(pin_level));
 /* 是否写入成功 */
 if (ret != sizeof(pin_level))
 {
-return ret;
+    return ret;
 }
 ```