Experts reveal: STM32 startup process full solution
The core tips of the electronic enthusiast network: This article mainly describes the comprehensive analysis of the STM32 boot process, including the introduction of the boot process, the display of the boot code and in-depth analysis. Compared with ARM's previous generation of mainstream ARM7/ARM9 core architecture, the startup mode of the new generation Cortex core architecture has undergone considerable changes. After the ARM7/ARM9 core controller is reset, the CPU will start from the absolute address 0x000000 of the memory space to execute the reset interrupt service routine, that is, the start address after the reset is fixed is 0x000000 (PC = 0x000000). At the same time, the position of the interrupt vector table is not fixed. The Cortex-M3 core is just the opposite. There are three cases: 1. The interrupt vector table can be located in the SRAM area by the boot pin setting, that is, the starting address is 0x2000000, and the PC pointer is located at 0x2000000 after resetting; 2. The interrupt vector table can be located in the FLASH area by the boot pin setting, that is, the starting address is 0x8000000, and the PC pointer is located at 0x8000000 after resetting; 3. The interrupt vector table can be located in the built-in bootloader area through the boot pin setting. This article does not discuss this situation; The Cortex-M3 core specifies that the start address must hold the top-of-stack pointer, while the second address must hold the reset interrupt entry vector address, so that after the Cortex-M3 core is reset, it will automatically be from the next 32-bit space of the start address. The reset interrupt entry vector is fetched and the jump is executed to reset the interrupt service routine. Compared to the ARM7/ARM9 core, the Cortex-M3 core fixes the location of the interrupt vector table and the starting address is changeable. After the above preparation is just the following, the startup file "stm32f10x_vector.s" provided by STM32's 2.02 firmware library is used as a template to make a brief and comprehensive analysis of the startup process of STM32.
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