STM32 -- program startup process

The work of the processor ： It just starts working , Will continue to get code , And implement

Workflow ： After the chip is powered on, reset exception will be triggered , And will jump to the specific offset position of the interrupt vector table , Get the content inside and execute , Modify and reset abnormal contents , You can let the processor perform the operations we specify

Main flash memory ： Data can be saved for a long time

SRAM： Static random access memory

Start file analysis （startup_stm32f103xe.s）

  Program startup process

（1） Initialize stack pointer

（2） Set up PC Pointer value

（3） Configure interrupt vector table

DCD A block of memory in bytes will be allocated for the specified target

 

（4） Configure the system clock

（5） call C Library function _main, Initializing the stack , Finally, I will jump to my own main Function

Reference resources 《Cortex-M3 Authoritative guide 》