From 19da4ff10f74c21ac527abf69ce6abdbe18d069d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=8D=E5=90=83=E6=B2=B9=E7=82=B8=E9=B8=A1?=
 <1425962791@qq.com>
Date: Sun, 8 Feb 2026 17:27:38 +0800
Subject: [PATCH] =?UTF-8?q?=E5=8A=A0=E5=85=A5api=20,=20jump=5Fto=5Fapp()?=
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---
 bootloader/Core/Src/main.c | 16 +------------
 bootloader/Ymodem/menu.c   | 48 +++++++++++++++++++++++++-------------
 bootloader/Ymodem/menu.h   |  5 ++--
 3 files changed, 36 insertions(+), 33 deletions(-)

diff --git a/bootloader/Core/Src/main.c b/bootloader/Core/Src/main.c
index 9554f32..fadbc8f 100644
--- a/bootloader/Core/Src/main.c
+++ b/bootloader/Core/Src/main.c
@@ -191,21 +191,7 @@ int main(void)
         {
             // 4. 校验成功，执行跳转
             USB_PutString("Valid APP found, jumping to application...\r\n");
-            // 获取APP的堆栈指针和跳转地址
-            uint32_t JumpAddress = *(__IO uint32_t*) (APPLICATION_ADDRESS + 4);
-            Jump_To_Application = (pFunction) JumpAddress;
-            // 在跳转前反初始化所有Bootloader用过的外设
-            USER_USB_DEVICE_DeInit();
-            HAL_RCC_DeInit();
-            HAL_DeInit();
-            SysTick->CTRL = 0;
-            SysTick->LOAD = 0;
-            SysTick->VAL = 0;
-            __disable_irq();
-
-            // 设置APP的堆栈指针并跳转
-            __set_MSP(*(__IO uint32_t*) APPLICATION_ADDRESS);
-            Jump_To_Application();
+            jump_to_app();
         }
     }
 		// no legal APP
diff --git a/bootloader/Ymodem/menu.c b/bootloader/Ymodem/menu.c
index da5f6b1..c4669bf 100644
--- a/bootloader/Ymodem/menu.c
+++ b/bootloader/Ymodem/menu.c
@@ -229,22 +229,7 @@ void Main_Menu(void)
     {
       USB_PutString("Start to execute the user application...\r\n");
       HAL_Delay(1000);
-      USER_USB_DEVICE_DeInit();
-      HAL_RCC_DeInit();
-      HAL_DeInit();
-      //user code here
-      SysTick->CTRL = 0X00;//禁止SysTick
-      SysTick->LOAD = 0;
-      SysTick->VAL = 0;
-      __disable_irq();
-
-      //set JumpAddress
-      JumpAddress = *(__IO uint32_t*) (APPLICATION_ADDRESS + 4);
-      /* Jump to user application */
-      Jump_To_Application = (pFunction) JumpAddress;
-      /* Initialize user application's Stack Pointer */
-      __set_MSP(*(__IO uint32_t*) APPLICATION_ADDRESS);
-      Jump_To_Application();
+      jump_to_app();
     }
     else if ((key == 0x34) && (FlashProtection == 1))
     {
@@ -281,6 +266,37 @@ void Main_Menu(void)
   }
 }
 
+/* Public functions ---------------------------------------------------------*/
+
+/**
+  * @brief  Jumps to the user application loaded in the Flash memory.
+  * @param  None
+  * @retval None
+  */
+void jump_to_app(void)
+{
+    USER_USB_DEVICE_DeInit();
+    // 手动配置USB引脚为GPIO输出，强制拉低DP线以模拟拔出
+    USER_USBD_LL_Simulate_Disconnect();
+    // 给予PC足够的时间来识别设备断开
+    HAL_Delay(1000);
+    HAL_RCC_DeInit();
+    HAL_DeInit();
+    //user code here
+    SysTick->CTRL = 0X00;//禁止SysTick
+    SysTick->LOAD = 0;
+    SysTick->VAL = 0;
+    __disable_irq();
+
+    //set JumpAddress
+    JumpAddress = *(__IO uint32_t*) (APPLICATION_ADDRESS + 4);
+    /* Jump to user application */
+    Jump_To_Application = (pFunction) JumpAddress;
+    /* Initialize user application's Stack Pointer */
+    __set_MSP(*(__IO uint32_t*) APPLICATION_ADDRESS);
+    Jump_To_Application();
+}
+
 /**
   * @}
   */
diff --git a/bootloader/Ymodem/menu.h b/bootloader/Ymodem/menu.h
index 5b082a4..362f27b 100644
--- a/bootloader/Ymodem/menu.h
+++ b/bootloader/Ymodem/menu.h
@@ -1,6 +1,6 @@
 /**
   ******************************************************************************
-  * @file    STM32F4xx_IAP/inc/menu.h 
+  * @file    STM32F4xx_IAP/inc/menu.h
   * @author  MCD Application Team
   * @version V1.0.0
   * @date    10-October-2011
@@ -17,7 +17,7 @@
   *
   * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
   ******************************************************************************
-  */ 
+  */
 
 /* Define to prevent recursive inclusion -------------------------------------*/
 #ifndef __MENU_H
@@ -34,6 +34,7 @@ typedef  void (*pFunction)(void);
 /* Exported macro ------------------------------------------------------------*/
 /* Exported functions ------------------------------------------------------- */
 void Main_Menu(void);
+void jump_to_app(void);
 
 #endif  /* __MENU_H */