STM32启动代码的详细分析

HJF(117592949) 21:16:42 谢谢回复 我也看了，但就是后半部分看不懂 从Default_Handler PROC之后都有重复的命名，很奇怪了。我就看到这里就不懂了 飞哥(376412054) 21:18:13 列出来看看 HJF(117592949) 21:18:21 好 HJF(117592949) 21:19:36 Stack_Size EQU 0x00000200 AREA STACK, NOINIT, READWRITE, ALIGN=3 ;用AREA标记STACK节的开始，未初始化，可读写，8字节对齐 Stack_Mem SPACE Stack_Size ;为Stack——Mem分配Stack_Size个字大小的连续地址空间，初始化为0 __initial_sp ;Stack地址分配结束标记（就是一个地址标记） ;// <h> Heap Configuration ;// <o> Heap Size (in Bytes) <0x0-0xFFFFFFFF:8> ;// </h> Heap_Size EQU 0x00000000 AREA HEAP, NOINIT, READWRITE, ALIGN=3 ;用AREA标记HEAP操作段的开始，暂未分配实际地址，可读写，8字节对齐 __heap_base ;堆的基地址标识（汇编过程中实际分配具体地址） Heap_Mem SPACE Heap_Size ;声明要为HEAP分配Heap_Size个字节大小的连续空间，并初始化为0 __heap_limit ;堆的末地址标记 PRESERVE8 ;要求堆栈保持8字节对齐 THUMB ;说明下面的代码是Thumb汇编 HJF(117592949) 21:19:50 ; Vector Table Mapped to Address 0 at Reset AREA RESET, DATA, READONLY ;标记RESET段的开始，这段定义为数据段，默认只读 EXPORT __Vectors ;声明一个全局可引用标记_Vectors __Vectors DCD __initial_sp ; Top of Stack，该处物理地址值即为_vectors标记所表示的值，该地址中存储_initial_sp所代表的地址值，填充大小为一个字（32-bit） DCD Reset_Handler ; Reset Handler 紧接上一个DCD，这个地址中填充Rest_Handler入口地址 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 detect DCD TAMPER_IRQHandler ; Tamper DCD RTC_IRQHandler ; RTC 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 DMAChannel1_IRQHandler ; DMA Channel 1 DCD DMAChannel2_IRQHandler ; DMA Channel 2 DCD DMAChannel3_IRQHandler ; DMA Channel 3 DCD DMAChannel4_IRQHandler ; DMA Channel 4 DCD DMAChannel5_IRQHandler ; DMA Channel 5 DCD DMAChannel6_IRQHandler ; DMA Channel 6 DCD DMAChannel7_IRQHandler ; DMA Channel 7 DCD ADC_IRQHandler ; ADC DCD USB_HP_CAN_TX_IRQHandler ; USB High Priority or CAN TX DCD USB_LP_CAN_RX0_IRQHandler ; USB Low Priority or CAN RX0 DCD CAN_RX1_IRQHandler ; CAN RX1 DCD CAN_SCE_IRQHandler ; CAN SCE DCD EXTI9_5_IRQHandler ; EXTI Line 9..5 DCD TIM1_BRK_IRQHandler ; TIM1 Break DCD TIM1_UP_IRQHandler ; TIM1 Update DCD TIM1_TRG_COM_IRQHandler ; TIM1 Trigger and Commutation 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 ; EXTI Line 15..10 DCD RTCAlarm_IRQHandler ; RTC Alarm through EXTI Line DCD USBWakeUp_IRQHandler ; USB Wakeup from suspend AREA |.text|, CODE, READONLY ;标记代码段的开始，只读，两个“|”必须要加上；因为“text”前面有个“.”AREA后面第一个参数为字段的标号；若以数值或标记开始标号就要用两个“|”夹起来 HJF(117592949) 21:20:05 ; Reset Handler Reset_Handler PROC EXPORT Reset_Handler [WEAK] IMPORT __main ;应用main标号，既main函数入口地址几经被包含在此段汇编文件中了 LDR R0, =__main BX R0 ;跳转从新开始执行main（） ENDP ;子代码段结束（与前面的PROC配合） ; 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 HJF(117592949) 21:20:21 Default_Handler PROC EXPORT WWDG_IRQHandler [WEAK] EXPORT PVD_IRQHandler [WEAK] EXPORT TAMPER_IRQHandler [WEAK] EXPORT RTC_IRQHandler [WEAK] EXPORT FLASH_IRQHandler [WEAK] EXPORT RCC_IRQHandler [WEAK] EXPORT EXTI0_IRQHandler [WEAK] EXPORT EXTI1_IRQHandler [WEAK]