STM32F4 bootloader程序
STM32的Bootloader主要负责在设备上电或复位后初始化硬件，然后加载并启动主应用程序。它还可以提供一些额外的功能，如通过串口、USB或其他接口进行程序烧录，支持固件升级，以及在开发过程中的调试。
本文章的bootloader实现以下功能：
v1.0.0 正常bootloader启动，升级
v1.0.1 增加备份功能，每次升级之前，把旧的代码备份，以防升级失败无法启动系统，只需在等待bootloader启动期间通过串口发送use backup system即可启用备份的系统
v1.0.2 可在等待bootloader启动期间通过串口发送downloadfile即可发送升级.bin文件升级
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版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
原文链接：https://blog.csdn.net/weixin_51077
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