STM32 IAP implementation process-EEWORLD

Collect

1. Concept

IAP: In-Application Programming, which is interpreted as "programming in the program" in Chinese. ICP (In-Circuit Programming) technology is to program the microcontroller through an online emulator, while ISP technology is a programming technology guided by the built-in bootloader program of the microcontroller.

2. Framework Design

Brief description: STM32's Flash 512Kb is divided into two parts, one 256Kb is used to store the minimum system, and the other 256Kb is used to store the APP code. The specific Flash size of the minimum system and APP can be adjusted according to the actual situation.

Difficulty analysis:

Storage address of the minimum system and APP
To find the storage address of the minimum system and APP, you need to understand the Flash storage space of STM32, as follows:
Minimum system and APP jump
After the system starts, it first enters the minimum system, which is determined by the hardware. After entering the minimum system, it determines whether the stack top pointer of the address burned by the APP system is correct to determine whether the APP is burned and start the APP. The official routine code is as follows:

/* Test if user code is programmed starting from address "ApplicationAddress" */

if (((*(__IO uint32_t*)ApplicationAddress) & 0x2FFE0000 ) == 0x20000000)

{

/* Jump to user application */

JumpAddress = *(__IO uint32_t*) (ApplicationAddress + 4);

Jump_To_Application = (pFunction) JumpAddress;

/* Initialize user application's Stack Pointer */

__set_MSP(*(__IO uint32_t*) ApplicationAddress);

Jump_To_Application();

}

The above is the first method. There is also a second method: after writing the APP program into Flash, write the relevant information in Flash. The minimum system program continuously detects and reads the information. If the information is read, write a flag to SRAM and restart the MCU. The rest also uses the above code, but the judgment condition is changed to the flag in SRAM.

Startup sequence
Regarding the startup sequence, there are more detailed instructions on the Internet
No IAP
Using IAP
Compilation of the minimum system and APP
The compilation of the minimum system can be done directly according to the normal project compilation, while the compilation of the APP requires special processing: the settings in keil are as follows:

The above is for the Flash address where the program is stored, and the interrupt vector table needs to be reset. You can use the function
void NVIC_SetVectorTable(u32 NVIC_VectTab, u32 Offset);
Call this function in the APP main function to set the offset. The offset should be equal to the offset of the program Flash.

Keywords：STM32 IAP Process Reference address：STM32 IAP implementation process

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