;******************** (C) COPYRIGHT Metanergy ********************
;* File Name : KEIL_Startup_myg0002.s
;* Author : MCD Application Team
;* Description : myg0002 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 >>>
;*******************************************************************************
; 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 0x00000200
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 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 0 ; Reserved
DCD EXTI11_IRQHandler ; EXTI Line 11 interrupt(AWU_WKP)
DCD FLASH_IRQHandler ; FLASH
DCD RCC_IRQHandler ; RCC
DCD EXTI0_IRQHandler ; EXTI Line 0
DCD EXTI1_IRQHandler ; EXTI Line 1
DCD EXTI2_IRQHandler ; EXTI Line 2
DCD EXTI3_IRQHandler ; EXTI Line 3
DCD EXTI4_IRQHandler ; EXTI Line 4
DCD EXTI5_IRQHandler ; EXTI Line 5
DCD TIM1_BRK_IRQHandler ; TIM1 break interrupt
DCD ADC1_IRQHandler ; ADC1 interrupt(combined with EXTI line 8)
DCD TIM1_UP_TRG_COM_IRQHandler ; TIM1 Update, Trigger and Commutation
DCD TIM1_CC_IRQHandler ; TIM1 Capture Compare
DCD TIM2_IRQHandler ; TIM2
DCD 0 ; Reserved
DCD TIM6_IRQHandler ; TIM6
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD EXTI6_IRQHandler ; EXTI Line 6
DCD EXTI7_IRQHandler ; EXTI Line 7
DCD I2C1_IRQHandler ; I2C1(combined with EXTI line 10)
DCD 0 ; Reserved
DCD SPI1_IRQHandler ; SPI1
DCD 0 ; Reserved
DCD USART1_IRQHandler ; USART1(combined with EXTI line 9)
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
__Vectors_End
__Vectors_Size EQU __Vectors_End - __Vectors
AREA |.text|, CODE, READONLY
; Reset handler routine
Reset_Handler PROC
EXPORT Reset_Handler [WEAK]
IMPORT __main
IMPORT SystemInit
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
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 EXTI11_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 EXTI5_IRQHandler [WEAK]
EXPORT TIM1_BRK_IRQHandler [WEAK]
EXPORT ADC1_IRQHandler [WEAK]
EXPORT TIM1_UP_TRG_COM_IRQHandler [WEAK]
EXPORT TIM1_CC_IRQHandler [WEAK]
EXPORT TIM2_IRQHandler [WEAK]
EXPORT TIM6_IRQHandler [WEAK]
EXPORT EXTI6_IRQHandler [WEAK]
EXPORT EXTI7_IRQHandler [WEAK]
EXPORT I2C1_IRQHandler [WEAK]
EXPORT SPI1_IRQHandler [WEAK]
EXPORT USART1_IRQHandler [WEAK]
WWDG_IRQHandler
EXTI11_IRQHandler
FLASH_IRQHandler
RCC_IRQHandler
EXTI0_IRQHandler
EXTI1_IRQHandler
EXTI2_IRQHandler
EXTI3_IRQHandler
EXTI4_IRQHandler
EXTI5_IRQHandler
TIM1_BRK_IRQHandler
ADC1_IRQHandler
TIM1_UP_TRG_COM_IRQHandler
TIM1_CC_IRQHandler
TIM2_IRQHandler
TIM6_IRQHandler
EXTI6_IRQHandler
EXTI7_IRQHandler
I2C1_IRQHandler
SPI1_IRQHandler
USART1_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 Metanergy *****END OF FILE*****
这段代码是一个汇编语言脚本，用于ARM Cortex-M0处理器的启动文件，通常与Keil MDK工具链一起使用。以下是对代码的解释：
汇编语言脚本解释
1. 栈和堆配置:
`Stack_Size` 和 `Heap_Size` 分别定义了栈和堆的大小。
`STACK` 和 `HEAP` 区域被定义为未初始化的内存区域，分别用于栈和堆。
2. **向量表**:
向量表是处理器复位后执行的第一段代码，它包含了指向各种异常和中断处理程序的指针。
`__Vectors` 是向量表的开始，`__Vectors_End` 是结束，`__Vectors_Size` 是向量表的大小。
向量表中包含了复位处理程序(`Reset_Handler`)、各种异常处理程序（如`NMI_Handler`, `HardFault_Handler`等）以及外部中断处理程序的地址。
3. 复位处理程序:
`Reset_Handler` 是处理器复位后执行的第一个函数。
它首先调用`SystemInit`函数进行系统初始化，然后跳转到C库的`__main`函数，最终调用`main()`函数。
4. 默认异常处理程序:
- 对于未定义的中断和异常，使用默认处理程序，这些处理程序通常只是进入无限循环。
5. 用户栈和堆初始化:
如果定义了`__MICROLIB`，则导出栈和堆的初始地址。
否则，定义`__user_initial_stackheap`函数，用于初始化用户的栈和堆。
注意事项
这个启动文件是为特定的处理器和工具链设计的，不应随意修改，除非你了解你在做什么。
如果你需要添加自定义的中断处理程序，你应该在向量表中相应的位置添加或替换处理程序的地址。
栈和堆的大小应该根据你的应用程序的需求进行调整。
这段代码是嵌入式系统编程中的一个重要组成部分，它确保了处理器复位后能够正确地初始化系统并开始执行C程序。
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