STM32启动文件startup_stm32f40xx.s详解

古城微笑少年丶 2022-10-12 05:53 363阅读 0赞

# stm32startup\_启动文件详解 #

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## 本文将详细根据代码，逐行解释启动文件。不想看代码的可以跳过，有总结性文字陈述。 ##

*  汇编语言使用`;`进行注释

--------------------

## 1. 启动文件简介 ##

*  启动文件的主要功能
    
    1、初始化堆栈指针 SP=\_initial\_sp  
    2、初始化 PC指针=Reset\_Handler  
    3、初始化中断向量表  
    4、配置系统时钟  
    5、调用 C库函数\_main 初始化用户堆栈，从而最终调用 main 函数去到 C的世界

![image-20210704002711214][]

## 2. 汇编基础 ##

*  如何在keil中查看汇编指令
    
    MDK->Help->Uvision Help中搜索到，以 EQU为例，检索如下：
    
    **检索出来的结果会有很多，我们只需要看 Assembler User Guide 这部分即可。**

![image-20210704003405707][]

*  常用汇编指令

![image-20210704003446767][]

--------------------

## 3. 启动代码讲解 ##

#### 3.1 栈初始化 ####

*  栈
    
    用于局部变量，函数调用。函数形参的开销。‘
 *  下面代码的注释都写了，大意如下
    
    > 定义Stack\_Size 为 0x400 大小，
    > 
    > 声明这段空间为： 栈空间，不初始话，可读可写，8字节对齐
    > 
    > 调用`SPACE`分配0x400 空间出来
    > 
    > 栈的顶部地址是`__initial_sp` \[因为栈是从高地址向低地址生长的。所以记录最高部分的地址即可。\]

; Amount of memory (in bytes) allocated for Stack
    ; Tailor this value to your application needs
    ; <h> Stack Configuration
    ;   <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>
    ; </h>
    
    Stack_Size      EQU     0x00000400		;400 是16进制的100kb， 设置栈大小为100kb
    
                    AREA    STACK, NOINIT, READWRITE, ALIGN=3  ;AREA: STACK:栈的名字    NOINIT:不初始化 READWRITE:可读可写  ALIGN:对齐方式，表示按照2^3 = 8 字节对齐
    Stack_Mem       SPACE   Stack_Size
    __initial_sp

#### 3.4 堆初始化 ####

*  下面代码的意思如下：

> 首先是定义堆的大小是 0x200， 然后声明这段空间是：不初始化，可读可写，2^3=8字节对齐
> 
> 然后heap\_base是堆的起点
> 
> 调用SPACE 分配 0x200 个字节给堆
> 
> 最后heap\_limit是堆的终点位置

; <h> Heap Configuration
    ;   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
    ; </h>
    
    Heap_Size       EQU     0x00000200							；EQU相当于c语言的#define  定义Heap_Size 等于 0x200
    
                    AREA    HEAP, NOINIT, READWRITE, ALIGN=3	；这是一段堆空间，不用初始话，可读可写，8字节对齐。
    __heap_base								；堆的起始位置
    Heap_Mem        SPACE   Heap_Size		;space是分配空间的意思， 分配大小是Heao_Size个大小
    __heap_limit				;堆的终点位置
    
                    PRESERVE8   ;8字节对齐
                    THUMB		;兼容THUM8指令集

#### 3.3 中断向量表的初始话 ####

这一部分是中断的重头戏，

*  EXPORT的意思是全局的意思
 *  DCD是分配空间的意思
 *  向量表其实是一个WORD（ 32 位整数）数组，每个下标对应一种异常，该下标元素的值则是该 ESR 的入口地  
    址。
 *  \_\_Vectors 为向量表起始地址， \_\_Vectors\_End 为向量表结束地址，两个相减即可算出向量  
    表大小。
 *  向量表从 FLASH 的 0 地址开始放置，以 4 个字节为一个单位，地址 0 存放的是栈  
    顶地址，0X04 存放的是复位程序的地址，以此类推。从代码上看，向量表中存放的都  
    是中断服务函数的函数名，可我们知道 C 语言中的函数名就是一个地址

; Vector Table Mapped to Address 0 at Reset
                    AREA    RESET, DATA, READONLY
                    EXPORT  __Vectors
                    EXPORT  __Vectors_End
                    EXPORT  __Vectors_Size
    
    __Vectors       DCD     __initial_sp               ; Top of Stack
                    DCD     Reset_Handler              ; Reset Handler
                    DCD     NMI_Handler                ; NMI Handler
                    DCD     HardFault_Handler          ; Hard Fault Handler
                    DCD     MemManage_Handler          ; MPU Fault Handler
                    DCD     BusFault_Handler           ; Bus Fault Handler
                    DCD     UsageFault_Handler         ; Usage Fault Handler
    							……………………保持文章简洁，这里删除少许。
                    DCD     SVC_Handler                ; SVCall Handler
                    DCD     DebugMon_Handler           ; Debug Monitor Handler
                    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 detection                                                     
    				……………………保持文章简洁，这里删除少许。                                           
                    DCD     CRYP_IRQHandler                   ; CRYP crypto                                     
                    DCD     HASH_RNG_IRQHandler               ; Hash and Rng
                    DCD     FPU_IRQHandler                    ; FPU
                                             
    __Vectors_End
    
    __Vectors_Size  EQU  __Vectors_End - __Vectors
    
                    AREA    |.text|, CODE, READONLY

![image-20210704130625122][]

--------------------

![image-20210704130731937][]

#### 3.4 复位程序 ####

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，然后调用 C库函数\_mian，最终调用 main 函数去到 C的世界。

; Reset handler
    Reset_Handler    PROC
                     EXPORT  Reset_Handler             [WEAK]
            IMPORT  SystemInit
            IMPORT  __main
    
                     LDR     R0, =SystemInit
                     BLX     R0
                     LDR     R0, =__main
                     BX      R0
                     ENDP

*  `WEAK`：表示弱定义，如果外部文件优先定义了该标号则首先引用该标号，如果外部  
    文件没有声明也不会出错。这里表示复位子程序可以由用户在其他文件重新实现，这里并  
    不是唯一的。
 *  `IMPORT`：表示该标号来自外部文件，跟 C 语言中的 EXTERN 关键字类似。这里表  
    示 SystemInit和\_\_main 这两个函数均来自外部的文件。

--------------------

![image-20210704125638723][]

> 上图是汇编语言的注释

--------------------

`SystemInit()`是一个标准的库函数，在 system\_STM32F4xx.c 这个库文件总定义。主要作  
用是配置系统时钟，

![image-20210704125430455][]

\_\_main 是一个标准的 C库函数，主要作用是初始化用户堆栈，最终调用 main 函数去到 C 的世界。这就是为什么我们写的程序都有一个 main 函数的原因。如果我们在这里不调用\_\_main，那么程序最终就不会调用我们 C文件里面的 main，如果是调皮的用户就可以  
修改主函数的名称，然后在这里面 IMPORT 你写的主函数名称即可。

![image-20210704125615320][]

#### 3.5 中断服务程序 ####

在启动文件里面已经帮我们写好所有中断的中断服务函数，跟我们平时写的中断服务函数不一样的就是这些函数都是空的，真正的中断复服务程序需要我们在外部的 C文件里面重新实现，这里只是提前占了一个位置而已。

*  注意

**如果我们在使用某个外设的时候，开启了某个中断，但是又忘记编写配套的中断服务程序或者函数名写错，那当中断来临的时，程序就会跳转到启动文件预先写好的空的中断服务程序中，并且在这个空函数中无线循环，即程序就死在这里。**

![image-20210704131404407][]

## 4 . startup\_stm32f40xx.s 源码 ##

;******************** (C) COPYRIGHT 2015 STMicroelectronics ********************
    ;* File Name          : startup_stm32f40xx.s
    ;* Author             : MCD Application Team
    ;* @version           : V1.5.0
    ;* @date              : 06-March-2015
    ;* Description        : STM32F40xxx/41xxx devices vector table for MDK-ARM toolchain. 
    ;*                      Same as startup_stm32f40_41xxx.s and maintained for legacy purpose 
    ;*                      This module performs:
    ;*                      - Set the initial SP
    ;*                      - Set the initial PC == Reset_Handler
    ;*                      - Set the vector table entries with the exceptions ISR address
    ;*                      - Configure the system clock and the external SRAM mounted on 
    ;*                        STM324xG-EVAL board to be used as data memory (optional, 
    ;*                        to be enabled by user)
    ;*                      - Branches to __main in the C library (which eventually
    ;*                        calls main()).
    ;*                      After Reset the CortexM4 processor is in Thread mode,
    ;*                      priority is Privileged, and the Stack is set to Main.
    ;* <<< Use Configuration Wizard in Context Menu >>>   
    ;*******************************************************************************
    ; 
    ; Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
    ; You may not use this file except in compliance with the License.
    ; You may obtain a copy of the License at:
    ; 
    ;        http://www.st.com/software_license_agreement_liberty_v2
    ; 
    ; Unless required by applicable law or agreed to in writing, software 
    ; distributed under the License is distributed on an "AS IS" BASIS, 
    ; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    ; See the License for the specific language governing permissions and
    ; limitations under the License.
    ; 
    ;*******************************************************************************
    
    ; Amount of memory (in bytes) allocated for Stack
    ; Tailor this value to your application needs
    ; <h> Stack Configuration
    ;   <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>
    ; </h>
    
    Stack_Size      EQU     0x00000400
    
                    AREA    STACK, NOINIT, READWRITE, ALIGN=3
    Stack_Mem       SPACE   Stack_Size
    __initial_sp
    
    
    ; <h> Heap Configuration
    ;   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
    ; </h>
    
    Heap_Size       EQU     0x00000200
    
                    AREA    HEAP, NOINIT, READWRITE, ALIGN=3
    __heap_base
    Heap_Mem        SPACE   Heap_Size
    __heap_limit
    
                    PRESERVE8
                    THUMB
    
    
    ; Vector Table Mapped to Address 0 at Reset
                    AREA    RESET, DATA, READONLY
                    EXPORT  __Vectors
                    EXPORT  __Vectors_End
                    EXPORT  __Vectors_Size
    
    __Vectors       DCD     __initial_sp               ; Top of Stack
                    DCD     Reset_Handler              ; Reset Handler
                    DCD     NMI_Handler                ; NMI Handler
                    DCD     HardFault_Handler          ; Hard Fault Handler
                    DCD     MemManage_Handler          ; MPU Fault Handler
                    DCD     BusFault_Handler           ; Bus Fault Handler
                    DCD     UsageFault_Handler         ; Usage Fault Handler
                    DCD     0                          ; Reserved
                    DCD     0                          ; Reserved
                    DCD     0                          ; Reserved
                    DCD     0                          ; Reserved
                    DCD     SVC_Handler                ; SVCall Handler
                    DCD     DebugMon_Handler           ; Debug Monitor Handler
                    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 detection                        
                    DCD     TAMP_STAMP_IRQHandler             ; Tamper and TimeStamps through the EXTI line            
                    DCD     RTC_WKUP_IRQHandler               ; RTC Wakeup through the EXTI line                       
                    DCD     FLASH_IRQHandler                  ; FLASH                                           
                    DCD     RCC_IRQHandler                    ; RCC                                             
                    DCD     EXTI0_IRQHandler                  ; EXTI Line0                                             
                    DCD     EXTI1_IRQHandler                  ; EXTI Line1                                             
                    DCD     EXTI2_IRQHandler                  ; EXTI Line2                                             
                    DCD     EXTI3_IRQHandler                  ; EXTI Line3                                             
                    DCD     EXTI4_IRQHandler                  ; EXTI Line4                                             
                    DCD     DMA1_Stream0_IRQHandler           ; DMA1 Stream 0                                   
                    DCD     DMA1_Stream1_IRQHandler           ; DMA1 Stream 1                                   
                    DCD     DMA1_Stream2_IRQHandler           ; DMA1 Stream 2                                   
                    DCD     DMA1_Stream3_IRQHandler           ; DMA1 Stream 3                                   
                    DCD     DMA1_Stream4_IRQHandler           ; DMA1 Stream 4                                   
                    DCD     DMA1_Stream5_IRQHandler           ; DMA1 Stream 5                                   
                    DCD     DMA1_Stream6_IRQHandler           ; DMA1 Stream 6                                   
                    DCD     ADC_IRQHandler                    ; ADC1, ADC2 and ADC3s                            
                    DCD     CAN1_TX_IRQHandler                ; CAN1 TX                                                
                    DCD     CAN1_RX0_IRQHandler               ; CAN1 RX0                                               
                    DCD     CAN1_RX1_IRQHandler               ; CAN1 RX1                                               
                    DCD     CAN1_SCE_IRQHandler               ; CAN1 SCE                                               
                    DCD     EXTI9_5_IRQHandler                ; External Line[9:5]s                                    
                    DCD     TIM1_BRK_TIM9_IRQHandler          ; TIM1 Break and TIM9                   
                    DCD     TIM1_UP_TIM10_IRQHandler          ; TIM1 Update and TIM10                 
                    DCD     TIM1_TRG_COM_TIM11_IRQHandler     ; TIM1 Trigger and Commutation and TIM11
                    DCD     TIM1_CC_IRQHandler                ; TIM1 Capture Compare                                   
                    DCD     TIM2_IRQHandler                   ; TIM2                                            
                    DCD     TIM3_IRQHandler                   ; TIM3                                            
                    DCD     TIM4_IRQHandler                   ; TIM4                                            
                    DCD     I2C1_EV_IRQHandler                ; I2C1 Event                                             
                    DCD     I2C1_ER_IRQHandler                ; I2C1 Error                                             
                    DCD     I2C2_EV_IRQHandler                ; I2C2 Event                                             
                    DCD     I2C2_ER_IRQHandler                ; I2C2 Error                                               
                    DCD     SPI1_IRQHandler                   ; SPI1                                            
                    DCD     SPI2_IRQHandler                   ; SPI2                                            
                    DCD     USART1_IRQHandler                 ; USART1                                          
                    DCD     USART2_IRQHandler                 ; USART2                                          
                    DCD     USART3_IRQHandler                 ; USART3                                          
                    DCD     EXTI15_10_IRQHandler              ; External Line[15:10]s                                  
                    DCD     RTC_Alarm_IRQHandler              ; RTC Alarm (A and B) through EXTI Line                  
                    DCD     OTG_FS_WKUP_IRQHandler            ; USB OTG FS Wakeup through EXTI line                        
                    DCD     TIM8_BRK_TIM12_IRQHandler         ; TIM8 Break and TIM12                  
                    DCD     TIM8_UP_TIM13_IRQHandler          ; TIM8 Update and TIM13                 
                    DCD     TIM8_TRG_COM_TIM14_IRQHandler     ; TIM8 Trigger and Commutation and TIM14
                    DCD     TIM8_CC_IRQHandler                ; TIM8 Capture Compare                                   
                    DCD     DMA1_Stream7_IRQHandler           ; DMA1 Stream7                                           
                    DCD     FSMC_IRQHandler                   ; FSMC                                            
                    DCD     SDIO_IRQHandler                   ; SDIO                                            
                    DCD     TIM5_IRQHandler                   ; TIM5                                            
                    DCD     SPI3_IRQHandler                   ; SPI3                                            
                    DCD     UART4_IRQHandler                  ; UART4                                           
                    DCD     UART5_IRQHandler                  ; UART5                                           
                    DCD     TIM6_DAC_IRQHandler               ; TIM6 and DAC1&2 underrun errors                   
                    DCD     TIM7_IRQHandler                   ; TIM7                   
                    DCD     DMA2_Stream0_IRQHandler           ; DMA2 Stream 0                                   
                    DCD     DMA2_Stream1_IRQHandler           ; DMA2 Stream 1                                   
                    DCD     DMA2_Stream2_IRQHandler           ; DMA2 Stream 2                                   
                    DCD     DMA2_Stream3_IRQHandler           ; DMA2 Stream 3                                   
                    DCD     DMA2_Stream4_IRQHandler           ; DMA2 Stream 4                                   
                    DCD     ETH_IRQHandler                    ; Ethernet                                        
                    DCD     ETH_WKUP_IRQHandler               ; Ethernet Wakeup through EXTI line                      
                    DCD     CAN2_TX_IRQHandler                ; CAN2 TX                                                
                    DCD     CAN2_RX0_IRQHandler               ; CAN2 RX0                                               
                    DCD     CAN2_RX1_IRQHandler               ; CAN2 RX1                                               
                    DCD     CAN2_SCE_IRQHandler               ; CAN2 SCE                                               
                    DCD     OTG_FS_IRQHandler                 ; USB OTG FS                                      
                    DCD     DMA2_Stream5_IRQHandler           ; DMA2 Stream 5                                   
                    DCD     DMA2_Stream6_IRQHandler           ; DMA2 Stream 6                                   
                    DCD     DMA2_Stream7_IRQHandler           ; DMA2 Stream 7                                   
                    DCD     USART6_IRQHandler                 ; USART6                                           
                    DCD     I2C3_EV_IRQHandler                ; I2C3 event                                             
                    DCD     I2C3_ER_IRQHandler                ; I2C3 error                                             
                    DCD     OTG_HS_EP1_OUT_IRQHandler         ; USB OTG HS End Point 1 Out                      
                    DCD     OTG_HS_EP1_IN_IRQHandler          ; USB OTG HS End Point 1 In                       
                    DCD     OTG_HS_WKUP_IRQHandler            ; USB OTG HS Wakeup through EXTI                         
                    DCD     OTG_HS_IRQHandler                 ; USB OTG HS                                      
                    DCD     DCMI_IRQHandler                   ; DCMI                                            
                    DCD     CRYP_IRQHandler                   ; CRYP crypto                                     
                    DCD     HASH_RNG_IRQHandler               ; Hash and Rng
                    DCD     FPU_IRQHandler                    ; FPU
                                             
    __Vectors_End
    
    __Vectors_Size  EQU  __Vectors_End - __Vectors
    
                    AREA    |.text|, CODE, READONLY
    
    ; Reset handler
    Reset_Handler    PROC
                     EXPORT  Reset_Handler             [WEAK]
            IMPORT  SystemInit
            IMPORT  __main
    
                     LDR     R0, =SystemInit
                     BLX     R0
                     LDR     R0, =__main
                     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
    MemManage_Handler\
                    PROC
                    EXPORT  MemManage_Handler          [WEAK]
                    B       .
                    ENDP
    BusFault_Handler\
                    PROC
                    EXPORT  BusFault_Handler           [WEAK]
                    B       .
                    ENDP
    UsageFault_Handler\
                    PROC
                    EXPORT  UsageFault_Handler         [WEAK]
                    B       .
                    ENDP
    SVC_Handler     PROC
                    EXPORT  SVC_Handler                [WEAK]
                    B       .
                    ENDP
    DebugMon_Handler\
                    PROC
                    EXPORT  DebugMon_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  TAMP_STAMP_IRQHandler             [WEAK]         
                    EXPORT  RTC_WKUP_IRQHandler               [WEAK]                     
                    EXPORT  FLASH_IRQHandler                  [WEAK]                                         
                    EXPORT  RCC_IRQHandler                    [WEAK]                                            
                    EXPORT  EXTI0_IRQHandler                  [WEAK]                                            
                    EXPORT  EXTI1_IRQHandler                  [WEAK]                                             
                    EXPORT  EXTI2_IRQHandler                  [WEAK]                                            
                    EXPORT  EXTI3_IRQHandler                  [WEAK]                                           
                    EXPORT  EXTI4_IRQHandler                  [WEAK]                                            
                    EXPORT  DMA1_Stream0_IRQHandler           [WEAK]                                
                    EXPORT  DMA1_Stream1_IRQHandler           [WEAK]                                   
                    EXPORT  DMA1_Stream2_IRQHandler           [WEAK]                                   
                    EXPORT  DMA1_Stream3_IRQHandler           [WEAK]                                   
                    EXPORT  DMA1_Stream4_IRQHandler           [WEAK]                                   
                    EXPORT  DMA1_Stream5_IRQHandler           [WEAK]                                   
                    EXPORT  DMA1_Stream6_IRQHandler           [WEAK]                                   
                    EXPORT  ADC_IRQHandler                    [WEAK]                         
                    EXPORT  CAN1_TX_IRQHandler                [WEAK]                                                
                    EXPORT  CAN1_RX0_IRQHandler               [WEAK]                                               
                    EXPORT  CAN1_RX1_IRQHandler               [WEAK]                                                
                    EXPORT  CAN1_SCE_IRQHandler               [WEAK]                                                
                    EXPORT  EXTI9_5_IRQHandler                [WEAK]                                    
                    EXPORT  TIM1_BRK_TIM9_IRQHandler          [WEAK]                  
                    EXPORT  TIM1_UP_TIM10_IRQHandler          [WEAK]                
                    EXPORT  TIM1_TRG_COM_TIM11_IRQHandler     [WEAK] 
                    EXPORT  TIM1_CC_IRQHandler                [WEAK]                                   
                    EXPORT  TIM2_IRQHandler                   [WEAK]                                            
                    EXPORT  TIM3_IRQHandler                   [WEAK]                                            
                    EXPORT  TIM4_IRQHandler                   [WEAK]                                            
                    EXPORT  I2C1_EV_IRQHandler                [WEAK]                                             
                    EXPORT  I2C1_ER_IRQHandler                [WEAK]                                             
                    EXPORT  I2C2_EV_IRQHandler                [WEAK]                                            
                    EXPORT  I2C2_ER_IRQHandler                [WEAK]                                               
                    EXPORT  SPI1_IRQHandler                   [WEAK]                                           
                    EXPORT  SPI2_IRQHandler                   [WEAK]                                            
                    EXPORT  USART1_IRQHandler                 [WEAK]                                          
                    EXPORT  USART2_IRQHandler                 [WEAK]                                          
                    EXPORT  USART3_IRQHandler                 [WEAK]                                         
                    EXPORT  EXTI15_10_IRQHandler              [WEAK]                                  
                    EXPORT  RTC_Alarm_IRQHandler              [WEAK]                  
                    EXPORT  OTG_FS_WKUP_IRQHandler            [WEAK]                        
                    EXPORT  TIM8_BRK_TIM12_IRQHandler         [WEAK]                 
                    EXPORT  TIM8_UP_TIM13_IRQHandler          [WEAK]                 
                    EXPORT  TIM8_TRG_COM_TIM14_IRQHandler     [WEAK] 
                    EXPORT  TIM8_CC_IRQHandler                [WEAK]                                   
                    EXPORT  DMA1_Stream7_IRQHandler           [WEAK]                                          
                    EXPORT  FSMC_IRQHandler                   [WEAK]                                             
                    EXPORT  SDIO_IRQHandler                   [WEAK]                                             
                    EXPORT  TIM5_IRQHandler                   [WEAK]                                             
                    EXPORT  SPI3_IRQHandler                   [WEAK]                                             
                    EXPORT  UART4_IRQHandler                  [WEAK]                                            
                    EXPORT  UART5_IRQHandler                  [WEAK]                                            
                    EXPORT  TIM6_DAC_IRQHandler               [WEAK]                   
                    EXPORT  TIM7_IRQHandler                   [WEAK]                    
                    EXPORT  DMA2_Stream0_IRQHandler           [WEAK]                                  
                    EXPORT  DMA2_Stream1_IRQHandler           [WEAK]                                   
                    EXPORT  DMA2_Stream2_IRQHandler           [WEAK]                                    
                    EXPORT  DMA2_Stream3_IRQHandler           [WEAK]                                    
                    EXPORT  DMA2_Stream4_IRQHandler           [WEAK]                                 
                    EXPORT  ETH_IRQHandler                    [WEAK]                                         
                    EXPORT  ETH_WKUP_IRQHandler               [WEAK]                     
                    EXPORT  CAN2_TX_IRQHandler                [WEAK]                                               
                    EXPORT  CAN2_RX0_IRQHandler               [WEAK]                                               
                    EXPORT  CAN2_RX1_IRQHandler               [WEAK]                                               
                    EXPORT  CAN2_SCE_IRQHandler               [WEAK]                                               
                    EXPORT  OTG_FS_IRQHandler                 [WEAK]                                       
                    EXPORT  DMA2_Stream5_IRQHandler           [WEAK]                                   
                    EXPORT  DMA2_Stream6_IRQHandler           [WEAK]                                   
                    EXPORT  DMA2_Stream7_IRQHandler           [WEAK]                                   
                    EXPORT  USART6_IRQHandler                 [WEAK]                                           
                    EXPORT  I2C3_EV_IRQHandler                [WEAK]                                              
                    EXPORT  I2C3_ER_IRQHandler                [WEAK]                                              
                    EXPORT  OTG_HS_EP1_OUT_IRQHandler         [WEAK]                      
                    EXPORT  OTG_HS_EP1_IN_IRQHandler          [WEAK]                      
                    EXPORT  OTG_HS_WKUP_IRQHandler            [WEAK]                        
                    EXPORT  OTG_HS_IRQHandler                 [WEAK]                                      
                    EXPORT  DCMI_IRQHandler                   [WEAK]                                             
                    EXPORT  CRYP_IRQHandler                   [WEAK]                                     
                    EXPORT  HASH_RNG_IRQHandler               [WEAK]
                    EXPORT  FPU_IRQHandler                    [WEAK]
    
    WWDG_IRQHandler                                                       
    PVD_IRQHandler                                      
    TAMP_STAMP_IRQHandler                  
    RTC_WKUP_IRQHandler                                
    FLASH_IRQHandler                                                       
    RCC_IRQHandler                                                            
    EXTI0_IRQHandler                                                          
    EXTI1_IRQHandler                                                           
    EXTI2_IRQHandler                                                          
    EXTI3_IRQHandler                                                         
    EXTI4_IRQHandler                                                          
    DMA1_Stream0_IRQHandler                                       
    DMA1_Stream1_IRQHandler                                          
    DMA1_Stream2_IRQHandler                                          
    DMA1_Stream3_IRQHandler                                          
    DMA1_Stream4_IRQHandler                                          
    DMA1_Stream5_IRQHandler                                          
    DMA1_Stream6_IRQHandler                                          
    ADC_IRQHandler                                         
    CAN1_TX_IRQHandler                                                            
    CAN1_RX0_IRQHandler                                                          
    CAN1_RX1_IRQHandler                                                           
    CAN1_SCE_IRQHandler                                                           
    EXTI9_5_IRQHandler                                                
    TIM1_BRK_TIM9_IRQHandler                        
    TIM1_UP_TIM10_IRQHandler                      
    TIM1_TRG_COM_TIM11_IRQHandler  
    TIM1_CC_IRQHandler                                               
    TIM2_IRQHandler                                                           
    TIM3_IRQHandler                                                           
    TIM4_IRQHandler                                                           
    I2C1_EV_IRQHandler                                                         
    I2C1_ER_IRQHandler                                                         
    I2C2_EV_IRQHandler                                                        
    I2C2_ER_IRQHandler                                                           
    SPI1_IRQHandler                                                          
    SPI2_IRQHandler                                                           
    USART1_IRQHandler                                                       
    USART2_IRQHandler                                                       
    USART3_IRQHandler                                                      
    EXTI15_10_IRQHandler                                            
    RTC_Alarm_IRQHandler                            
    OTG_FS_WKUP_IRQHandler                                
    TIM8_BRK_TIM12_IRQHandler                      
    TIM8_UP_TIM13_IRQHandler                       
    TIM8_TRG_COM_TIM14_IRQHandler  
    TIM8_CC_IRQHandler                                               
    DMA1_Stream7_IRQHandler                                                 
    FSMC_IRQHandler                                                            
    SDIO_IRQHandler                                                            
    TIM5_IRQHandler                                                            
    SPI3_IRQHandler                                                            
    UART4_IRQHandler                                                          
    UART5_IRQHandler                                                          
    TIM6_DAC_IRQHandler                            
    TIM7_IRQHandler                              
    DMA2_Stream0_IRQHandler                                         
    DMA2_Stream1_IRQHandler                                          
    DMA2_Stream2_IRQHandler                                           
    DMA2_Stream3_IRQHandler                                           
    DMA2_Stream4_IRQHandler                                        
    ETH_IRQHandler                                                         
    ETH_WKUP_IRQHandler                                
    CAN2_TX_IRQHandler                                                           
    CAN2_RX0_IRQHandler                                                          
    CAN2_RX1_IRQHandler                                                          
    CAN2_SCE_IRQHandler                                                          
    OTG_FS_IRQHandler                                                    
    DMA2_Stream5_IRQHandler                                          
    DMA2_Stream6_IRQHandler                                          
    DMA2_Stream7_IRQHandler                                          
    USART6_IRQHandler                                                        
    I2C3_EV_IRQHandler                                                          
    I2C3_ER_IRQHandler                                                          
    OTG_HS_EP1_OUT_IRQHandler                           
    OTG_HS_EP1_IN_IRQHandler                            
    OTG_HS_WKUP_IRQHandler                                
    OTG_HS_IRQHandler                                                   
    DCMI_IRQHandler                                                            
    CRYP_IRQHandler                                                    
    HASH_RNG_IRQHandler
    FPU_IRQHandler
       
                    B       .
    
                    ENDP
    
                    ALIGN
    
    ;*******************************************************************************
    ; User Stack and Heap initialization
    ;*******************************************************************************
                     IF      :DEF:__MICROLIB
                    
                     EXPORT  __initial_sp
                     EXPORT  __heap_base
                     EXPORT  __heap_limit
                    
                     ELSE
                    
                     IMPORT  __use_two_region_memory
                     EXPORT  __user_initial_stackheap
                     
    __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*****

[image-20210704002711214]: /images/20221005/33802c1a254a473e89fbd9cc957c0089.png
[image-20210704003405707]: /images/20221005/0261c60f706e4d6d8a3e5e76ae5f7acb.png
[image-20210704003446767]: /images/20221005/a1cb865851614dbc86720a9f4967265e.png
[image-20210704130625122]: /images/20221005/768a0b27796f4cbe81120a0443e80e00.png
[image-20210704130731937]: /images/20221005/888b474fb55841adb6e4d3554ca37c88.png
[image-20210704125638723]: /images/20221005/26d21862a24c454199dcada81ee70855.png
[image-20210704125430455]: /images/20221005/9717b8f94d7b43c5affa07a9ac33330b.png
[image-20210704125615320]: /images/20221005/f74e96d103ab41d78fedf175fc5d799e.png
[image-20210704131404407]: /images/20221005/5691b44582ed48a59e7bdcab3cf879ae.png