What is IAP? How to implement IAP?-EEWORLD

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IAP is the acronym for In Application Programming. It is the process of burning a part of the User Flash area during the operation of the user's own program. The purpose is to conveniently update the firmware program in the product through the reserved communication port after the product is released.

Usually when users need to implement the IAP function, that is, the user program updates itself during operation, two project codes need to be written when designing the firmware program. The first project code does not perform normal functional operations, but only receives programs or data through a communication channel (such as USB, USART) to perform updates to the second part of the code; the second project code is the real functional code. Both parts of the project code are burned into the User Flash at the same time. When the chip is powered on, the first project code starts to run first, and it performs the following operations:

1) Check whether the second part of the code needs to be updated

2) If no update is required, go to 4)

3) Perform update operations

4) Jump to the second part of the code execution

The first part of the code must be burned in through other means, such as JTAG or ISP; the second part of the code can be burned in using the IAP function of the first part of the code, or it can be burned in together with the first part of the code. If the program needs to be updated later, it can be updated through the first part of the IAP code.

For STM32, because its interrupt vector table is located in the lowest address area of the program memory, in order to enable the first part of the code to respond to the interrupt correctly, the first part of the code is usually arranged in the beginning area of the Flash, and the second part of the code follows it.

When the second part of the code starts to execute, it first needs to map the CPU's interrupt vector table to its own vector table, and then perform other operations.

If the IAP program is damaged, the product must be returned to the factory to re-program, which is very troublesome and very time-consuming and costly. In response to such a demand, STM32 automatically sets the first 4 pages of the user Flash area as write protection while implementing read protection on the Flash area, which can effectively ensure that the IAP program (the first part of the code) area will not be accidentally damaged.

There is an example of using USART to implement IAP on ST's website. You can refer to this example and the corresponding manual.

Application Note AN2557 - STM32F10xxx in-application programming using the USART

Routine: AN2557 - STM32F10xxx in-application programming using the USART

Keywords：IAP Reference address：What is IAP? How to implement IAP?

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