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STM32上电之后的启动流程是如何去完成的

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问答对人有帮助，内容完整，我也想知道答案 0 STM32上电之后的启动流程是如何去完成的？其代码程序该怎样去编写呢？ 0
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答案对人有帮助，有参考价值 0 关于STM32上电之后的启动流程，梳理一下思路，如有错误，回头来改。加载程序：当用户选择想单片机烧录程序的时候，BOOT0，BOOT1来决定代码存放的位置并将这片存储空间重新映射到0×00000000开始的位置。启动程序：然后程序从开始处执行，首先执行的不是主（），启动而是文件异常信号处理：当用户按下复位键（或者产生其他异常信号）的时候 stm32的启动模式程序截图通常是从地址0x00000000开始的、系统复位后，处理器首先读取表中的前两个字（8个字），CPU查询中断表，跳转到相对应的处理。节），第一个字存入MSP，第二个字为复位，它表示程序启动启动的地址（复位处理）模式的设置 BOOT0和BOOT1用于设置STM32的启动方式，启动模式只决定程序烧录的位置，加载完成程序之后会有一个重映射（映射到0x0000000地址位置）；真正产生复位信号的时候，CPU还是开始从位置执行。 C语言内存分发在运行C用户程序的时候，内存将数据和代码一次启动几个部分启动分析以STMF051启动文件为例，与文件32的其他启动过程都是差不多的。首先声明空间，定义了异常的入口表（其中有很多异常的入口表）地址)，然后进行系统初始化，用户空间的初始化，最后才跳转到C程序中的main()函数，执行用户程序。总言之，启动文件设置了的运行环境。 ;****************** (C) COPYRIGHT 2016 STMicroelectronics ****************** ;* File Name : startup_stm32f051x8.s ;* Author : MCD Application Team ;* Description : STM32F051x4/STM32F051x6/STM32F051x8 devices vector table for MDK-ARM toolchain. ;* This module performs: ;* - Set the initial SP ;* - Set the initial PC == Reset_Handler ;* - Set the vector table entries with the exceptions ISR address ;* - Branches to __main in the C library (which eventually ;* calls main()). ;* After Reset the CortexM0 processor is in Thread mode, ;* priority is Privileged, and the Stack is set to Main. ;* <<< Use Configuration Wizard in Context Menu >>> ;******************************************************************************* ;* ;* Redistribution and use in source and binary forms, with or without modification, ;* are permitted provided that the following conditions are met: ;* 1. Redistributions of source code must retain the above copyright notice, ;* this list of conditions and the following disclaimer. ;* 2. Redistributions in binary form must reproduce the above copyright notice, ;* this list of conditions and the following disclaimer in the documentation ;* and/or other materials provided with the distribution. ;* 3. Neither the name of STMicroelectronics nor the names of its contributors ;* may be used to endorse or promote products derived from this software ;* without specific prior written permission. ;* ;* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" ;* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE ;* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE ;* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE ;* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL ;* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR ;* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER ;* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, ;* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ;* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ; ;***************************************************************************** ; Amount of memory (in bytes) allocated for Stack ; Tailor this value to your application needs ; Stack Configuration ; Stack Size (in Bytes) <0x0-0xFFFFFFFF:8> ; Stack_Size EQU 0x400 ;定义栈的大小1K AREA STACK, NOINIT, READWRITE, ALIGN=3 ;AREA 是定义一个段，此处定义的是栈段，没有初始化的段，可读可写，align是说段的起始地址应该是8的倍数 Stack_Mem SPACE Stack_Size ;SPACE 是为栈分配空间，开辟栈空间大小为0x400 __initial_sp ;__initial_sp是个标号，这个标号指向栈的栈顶 ; Heap Configuration ; Heap Size (in Bytes) <0x0-0xFFFFFFFF:8> ; Heap_Size EQU 0x200 ;定义堆的大小 512B AREA HEAP, NOINIT, READWRITE, ALIGN=3 __heap_base ;堆的起始地址 Heap_Mem SPACE Heap_Size ;堆的大小 __heap_limit ;堆的结束地址 PRESERVE8 THUMB ; Vector Table Mapped to Address 0 at Reset AREA RESET, DATA, READONLY ;此处定义的数据段，数据段放的是中断向量表，只读 EXPORT __Vectors ;EXPORT在程序中声明一个全局的标号__Vectors，该标号可在其它的文件中引用 EXPORT __Vectors_End EXPORT __Vectors_Size ;DCD指令以字为单位分配内存，要求4字节对齐，并要求初始化这些内存。 ;在向量表中，DCD 分配了一堆内存，并且以 ESR 的入口地址初始化它们。 __Vectors DCD __initial_sp ; Top of Stack 存放__initial_sp，也就是堆栈栈顶的地址 DCD Reset_Handler ; Reset Handler DCD NMI_Handler ; NMI Handler DCD HardFault_Handler ; Hard Fault Handler DCD 0 ; Reserved DCD 0 ; Reserved DCD 0 ; Reserved DCD 0 ; Reserved DCD 0 ; Reserved DCD 0 ; Reserved DCD 0 ; Reserved DCD SVC_Handler ; SVCall Handler DCD 0 ; Reserved DCD 0 ; Reserved DCD PendSV_Handler ; PendSV Handler DCD SysTick_Handler ; SysTick Handler ; External Interrupts DCD WWDG_IRQHandler ; Window Watchdog DCD PVD_IRQHandler ; PVD through EXTI Line detect DCD RTC_IRQHandler ; RTC through EXTI Line DCD FLASH_IRQHandler ; FLASH DCD RCC_IRQHandler ; RCC DCD EXTI0_1_IRQHandler ; EXTI Line 0 and 1 DCD EXTI2_3_IRQHandler ; EXTI Line 2 and 3 DCD EXTI4_15_IRQHandler ; EXTI Line 4 to 15 DCD TSC_IRQHandler ; TS DCD DMA1_Channel1_IRQHandler ; DMA1 Channel 1 DCD DMA1_Channel2_3_IRQHandler ; DMA1 Channel 2 and Channel 3 DCD DMA1_Channel4_5_IRQHandler ; DMA1 Channel 4 and Channel 5 DCD ADC1_COMP_IRQHandler ; ADC1, COMP1 and COMP2 DCD TIM1_BRK_UP_TRG_COM_IRQHandler ; TIM1 Break, Update, Trigger and Commutation DCD TIM1_CC_IRQHandler ; TIM1 Capture Compare DCD TIM2_IRQHandler ; TIM2 DCD TIM3_IRQHandler ; TIM3 DCD TIM6_DAC_IRQHandler ; TIM6 and DAC DCD 0 ; Reserved DCD TIM14_IRQHandler ; TIM14 DCD TIM15_IRQHandler ; TIM15 DCD TIM16_IRQHandler ; TIM16 DCD TIM17_IRQHandler ; TIM17 DCD I2C1_IRQHandler ; I2C1 DCD I2C2_IRQHandler ; I2C2 DCD SPI1_IRQHandler ; SPI1 DCD SPI2_IRQHandler ; SPI2 DCD USART1_IRQHandler ; USART1 DCD USART2_IRQHandler ; USART2 DCD 0 ; Reserved DCD CEC_IRQHandler ; CEC __Vectors_End __Vectors_Size EQU __Vectors_End - __Vectors AREA \|.text\|, CODE, READONLY ;text 一般代表代码段 ; Reset handler routine Reset_Handler PROC EXPORT Reset_Handler [WEAK] ;“[WEAK]”是一个弱符号声明，就是告诉编译器，我这里声明的标号的优先权低于其它同名的标号，也就是说如果在工程中还有别的函数和我同名，那么你就调用和我同名的其它函数，如果没有同名的，那你就调用我。 IMPORT __main ;IMPORT则表明后面标号所代表的函数是调用其它文件的 IMPORT SystemInit LDR R0, =SystemInit ;复位子程序是系统上电后第一个执行的程序，调用 SystemInit 函数初始化系统时钟 BLX R0 LDR R0, =__main ;__main 是一个标准的 C 库函数，主要作用是初始化用户堆栈，并在函数的最后调用main 函数去到 C 的世界 BX R0 ENDP ; Dummy Exception Handlers (infinite loops which can be modified) NMI_Handler PROC EXPORT NMI_Handler [WEAK] B . ENDP HardFault_Handler PROC EXPORT HardFault_Handler [WEAK] B . ENDP SVC_Handler PROC EXPORT SVC_Handler [WEAK] B . ENDP PendSV_Handler PROC EXPORT PendSV_Handler [WEAK] B . ENDP SysTick_Handler PROC EXPORT SysTick_Handler [WEAK] B . ENDP Default_Handler PROC EXPORT WWDG_IRQHandler [WEAK] EXPORT PVD_IRQHandler [WEAK] EXPORT RTC_IRQHandler [WEAK] EXPORT FLASH_IRQHandler [WEAK] EXPORT RCC_IRQHandler [WEAK] EXPORT EXTI0_1_IRQHandler [WEAK] EXPORT EXTI2_3_IRQHandler [WEAK] EXPORT EXTI4_15_IRQHandler [WEAK] EXPORT TSC_IRQHandler [WEAK] EXPORT DMA1_Channel1_IRQHandler [WEAK] EXPORT DMA1_Channel2_3_IRQHandler [WEAK] EXPORT DMA1_Channel4_5_IRQHandler [WEAK] EXPORT ADC1_COMP_IRQHandler [WEAK] EXPORT TIM1_BRK_UP_TRG_COM_IRQHandler [WEAK] EXPORT TIM1_CC_IRQHandler [WEAK] EXPORT TIM2_IRQHandler [WEAK] EXPORT TIM3_IRQHandler [WEAK] EXPORT TIM6_DAC_IRQHandler [WEAK] EXPORT TIM14_IRQHandler [WEAK] EXPORT TIM15_IRQHandler [WEAK] EXPORT TIM16_IRQHandler [WEAK] EXPORT TIM17_IRQHandler [WEAK] EXPORT I2C1_IRQHandler [WEAK] EXPORT I2C2_IRQHandler [WEAK] EXPORT SPI1_IRQHandler [WEAK] EXPORT SPI2_IRQHandler [WEAK] EXPORT USART1_IRQHandler [WEAK] EXPORT USART2_IRQHandler [WEAK] EXPORT CEC_IRQHandler [WEAK] WWDG_IRQHandler PVD_IRQHandler RTC_IRQHandler FLASH_IRQHandler RCC_IRQHandler EXTI0_1_IRQHandler EXTI2_3_IRQHandler EXTI4_15_IRQHandler TSC_IRQHandler DMA1_Channel1_IRQHandler DMA1_Channel2_3_IRQHandler DMA1_Channel4_5_IRQHandler ADC1_COMP_IRQHandler TIM1_BRK_UP_TRG_COM_IRQHandler TIM1_CC_IRQHandler TIM2_IRQHandler TIM3_IRQHandler TIM6_DAC_IRQHandler TIM14_IRQHandler TIM15_IRQHandler TIM16_IRQHandler TIM17_IRQHandler I2C1_IRQHandler I2C2_IRQHandler SPI1_IRQHandler SPI2_IRQHandler USART1_IRQHandler USART2_IRQHandler CEC_IRQHandler B . ENDP ALIGN ;*************************************************************************** ; User Stack and Heap initialization ;*************************************************************************** IF :DEF:__MICROLIB ;检查是否定义了__MICROLIB,如果定义了则条件成立。用户可以在配置软件中勾选。 ;用户栈和堆初始化,由C库函数_main来完成 EXPORT __initial_sp ;栈顶地址 EXPORT __heap_base ;堆起始地址 EXPORT __heap_limit ;堆结束地址 ELSE IMPORT __use_two_region_memory EXPORT __user_initial_stackheap ;用户自己来初始化堆栈 __user_initial_stackheap LDR R0, = Heap_Mem LDR R1, = (Stack_Mem + Stack_Size) LDR R2, = (Heap_Mem + Heap_Size) LDR R3, = Stack_Mem BX LR ALIGN ENDIF END ;******************** (C) COPYRIGHT STMicroelectronics *END OF FILE***

2021-11-29 14:49:34 评论举报李萌