IAP（In Application Programming）即在应用编程，IAP 是用户自己的程序在运行过程中对User Flash 的部分区域进行烧写，目的是为了在产品发布后可以方便地通过预留的通信口对产品中的固件程序进行更新升级。通常实现 IAP 功能时，即用户程序运行中作自身的更新操作，需要在设计固件程序时编写两个项目代码，第一个项目程序不执行正常的功能操作，而只是通过某种通信方式(如CAN)接收程序或数据，执行对第二部分代码的更新；第二个项目代码才是真正的功能代码-IAP (In Application Programming) in the application programming, IAP is the user s own program in the course of the user Flash part of the programming area, the purpose is to the product after the release can be easily through the reserved communication port in the product Of the firmware program to update the upgrade. Usually IAP function, that is, the user program to run their own update operation, the need to design the firmware program to write two project code, the first project does not perform the normal function of the operation, but only through a communication (such as CAN) to receive the program or data, the implementation of the second part of the code update　the second project code is the real function code