终于开始点亮第一个LED了,惯用思维,从模仿开始!前两天一直在做最小系统板,今天上午才调试出来,测试程序也是的别人的,从现在开始就来仔细分析一下这第一个点灯**吧! 由于在开始学习stm32之前已经接触过相关的指导书了,所以现在学起来还是比较轻松的,废话不多说,直接从启动文件开始吧! 启动文件这部分和arm11的还是很类似的,是开发板上电后执行的第一段代码,唯一不同的感觉的就是比arm11的启动文件简单多了,下面的一些代码解释都是和arm11对照来说的,上代码吧,声明,我使用的是3.5的库!芯片的具体型号是stm32f103zet6!这里我不适用keil自带的启动代码,为什么,百度能搜到原因! 首先明白一点自己所用的板子的简单介绍采用STM32F103系列最高端配置芯片STM32F103ZET6,Cortex-M3内核32位处理器,72M主频,LQFP144封装,片内FLASH容量:512K,片内SRAM容量:64 所以采用的是sartup_stm32f10x_hd.s这个启动文件,这是型号所决定的,当然,如果你自己想要写启动文件的另当别论! 上代码了 Stack_Size EQU 0x00000400//这里是定义了栈的大小
AREA STACK, NOINIT, READWRITE, ALIGN=3 //AREA表示开辟一个新的段(数据或者代码)后面就指定了该段的属性
//名称为stack,未初始化,可读写,以2*2*2 = 8字节方式对齐
//所谓字节对齐就是就是该代码段的指令地址能够被8整除,Cortex-M3
//的指令地址要求是4字节对齐的,要求不同罢了!
Stack_Mem SPACE Stack_Size //分配堆栈空间,将Stack_Size的首地址给Stack_Mem,SPACE 用于分配一片连续的存储单元
__initial_sp //初始化堆栈指针,注意栈是向下增长的
__initial_spTop EQU 0x20000400 ; stack used for SystemInit_ExtMemCtl
; <h> Heap Configuration
; <o> Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>
Heap_Size EQU 0x00000200 //与之对应的是堆的大小
AREA HEAP, NOINIT, READWRITE, ALIGN=3 //同样的道理
__heap_base
Heap_Mem SPACE Heap_Size
__heap_limit
PRESERVE8 //这是整个文件8字节的描述方式,在使用RVDS2.2的时候也是要8字节对齐的
//这个和编译器和处理器有关,不许深究
THUMB //THUNB指令集
; Vector Table Mapped to Address 0 at Reset
AREA RESET, DATA, READONLY //下面就是复位向量了
EXPORT __Vectors //EXPORT用于声明一个符号,相当于全局变量,可以被调用
EXPORT __Vectors_End //相对应的还有一个IMPORT是调用别的函数,相当于一个全局变量
EXPORT __Vectors_Size
__Vectors DCD __initial_spTop ; Top of Stack//DCD指令为各中断向量分配空间
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 detect
DCD TAMPER_IRQHandler ; Tamper
DCD RTC_IRQHandler ; RTC
DCD FLASH_IRQHandler ; Flash
DCD RCC_IRQHandler ; RCC
//以下为外部中断向量表
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 DMA1_Channel1_IRQHandler ; DMA1 Channel 1
DCD DMA1_Channel2_IRQHandler ; DMA1 Channel 2
DCD DMA1_Channel3_IRQHandler ; DMA1 Channel 3
DCD DMA1_Channel4_IRQHandler ; DMA1 Channel 4
DCD DMA1_Channel5_IRQHandler ; DMA1 Channel 5
DCD DMA1_Channel6_IRQHandler ; DMA1 Channel 6
DCD DMA1_Channel7_IRQHandler ; DMA1 Channel 7
DCD ADC1_2_IRQHandler ; ADC1 & ADC2
DCD USB_HP_CAN1_TX_IRQHandler ; USB High Priority or CAN1 TX
DCD USB_LP_CAN1_RX0_IRQHandler ; USB Low Priority or CAN1 RX0
DCD CAN1_RX1_IRQHandler ; CAN1 RX1
DCD CAN1_SCE_IRQHandler ; CAN1 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
DCD TIM8_BRK_IRQHandler ; TIM8 Break
DCD TIM8_UP_IRQHandler ; TIM8 Update
DCD TIM8_TRG_COM_IRQHandler ; TIM8 Trigger and Commutation
DCD TIM8_CC_IRQHandler ; TIM8 Capture Compare
DCD ADC3_IRQHandler ; ADC3
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_IRQHandler ; TIM6
DCD TIM7_IRQHandler ; TIM7
DCD DMA2_Channel1_IRQHandler ; DMA2 Channel1
DCD DMA2_Channel2_IRQHandler ; DMA2 Channel2
DCD DMA2_Channel3_IRQHandler ; DMA2 Channel3
DCD DMA2_Channel4_5_IRQHandler ; DMA2 Channel4 & Channel5
__Vectors_End
__Vectors_Size EQU __Vectors_End - __Vectors
AREA |.text|, CODE, READONLY //开辟代码段
; Dummy SystemInit_ExtMemCtl function
SystemInit_ExtMemCtl PROC
EXPORT SystemInit_ExtMemCtl [WEAK]
BX LR
ENDP
; Reset handler routine
Reset_Handler PROC
EXPORT Reset_Handler [WEAK]
IMPORT __main //调用main函数,这就是每个程序需要main函数的原因
//所以你可以修改成你顺眼的主函数
LDR R0, = SystemInit_ExtMemCtl ; initialize external memory controller
BLX R0
//这应该是一条位置相关跳转代码指令,也也就是跳转到运行地址
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