基于stm32f103zet6點(diǎn)亮LED之啟動(dòng)文件
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終于開(kāi)始點(diǎn)亮第一個(gè)LED了，慣用思維，從模仿開(kāi)始！前兩天一直在做最小系統(tǒng)板，今天上午才調(diào)試出來(lái)，測(cè)試程序也是的別人的，從現(xiàn)在開(kāi)始就來(lái)仔細(xì)分析一下這第一個(gè)點(diǎn)燈大法吧！
由于在開(kāi)始學(xué)習(xí)stm32之前已經(jīng)接觸過(guò)相關(guān)的指導(dǎo)書了，所以現(xiàn)在學(xué)起來(lái)還是比較輕松的，廢話不多說(shuō)，直接從啟動(dòng)文件開(kāi)始吧!
啟動(dòng)文件這部分和arm11的還是很類似的，是開(kāi)發(fā)板上電后執(zhí)行的第一段代碼，唯一不同的感覺(jué)的就是比arm11的啟動(dòng)文件簡(jiǎn)單多了，下面的一些代碼解釋都是和arm11對(duì)照來(lái)說(shuō)的，上代碼吧，聲明，我使用的是3.5的庫(kù)！芯片的具體型號(hào)是stm32f103zet6！這里我不適用keil自帶的啟動(dòng)代碼，為什么，百度能搜到原因！
首先明白一點(diǎn)自己所用的板子的簡(jiǎn)單介紹采用STM32F103系列最高端配置芯片STM32F103ZET6，Cortex-M3內(nèi)核32位處理器,72M主頻，LQFP144封裝，片內(nèi)FLASH容量:512K,片內(nèi)SRAM容量:64
所以采用的是sartup_stm32f10x_hd.s這個(gè)啟動(dòng)文件，這是型號(hào)所決定的，當(dāng)然，如果你自己想要寫啟動(dòng)文件的另當(dāng)別論！
上代碼了
Stack_Size EQU 0x00000400//這里是定義了棧的大小
AREA STACK, NOINIT, READWRITE, ALIGN=3 //AREA表示開(kāi)辟一個(gè)新的段（數(shù)據(jù)或者代碼）后面就指定了該段的屬性
//名稱為stack，未初始化，可讀寫，以2*2*2 = 8字節(jié)方式對(duì)齊
//所謂字節(jié)對(duì)齊就是就是該代碼段的指令地址能夠被8整除，Cortex-M3
//的指令地址要求是4字節(jié)對(duì)齊的，要求不同罷了！
Stack_Mem SPACE Stack_Size //分配堆?？臻g，將Stack_Size的首地址給Stack_Mem，SPACE 用于分配一片連續(xù)的存儲(chǔ)單元
__initial_sp //初始化堆棧指針，注意棧是向下增長(zhǎng)的
__initial_spTop EQU 0x20000400 ; stack used for SystemInit_ExtMemCtl
;
;
;
Heap_Size EQU 0x00000200 //與之對(duì)應(yīng)的是堆的大小
AREA HEAP, NOINIT, READWRITE, ALIGN=3 //同樣的道理
__heap_base
Heap_Mem SPACE Heap_Size
__heap_limit
PRESERVE8 //這是整個(gè)文件8字節(jié)的描述方式，在使用RVDS2.2的時(shí)候也是要8字節(jié)對(duì)齊的
//這個(gè)和編譯器和處理器有關(guān)，不許深究
THUMB //THUNB指令集
; Vector Table Mapped to Address 0 at Reset
AREA RESET, DATA, READONLY //下面就是復(fù)位向量了
EXPORT __Vectors //EXPORT用于聲明一個(gè)符號(hào)，相當(dāng)于全局變量，可以被調(diào)用
EXPORT __Vectors_End //相對(duì)應(yīng)的還有一個(gè)IMPORT是調(diào)用別的函數(shù)，相當(dāng)于一個(gè)全局變量
EXPORT __Vectors_Size
__Vectors DCD __initial_spTop ; Top of Stack//DCD指令為各中斷向量分配空間
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
//以下為外部中斷向量表
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 //開(kāi)辟代碼段
; 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 //調(diào)用main函數(shù)，這就是每個(gè)程序需要main函數(shù)的原因
//所以你可以修改成你順眼的主函數(shù)
LDR R0, = SystemInit_ExtMemCtl ; initialize external memory controller
BLX R0
//這應(yīng)該是一條位置相關(guān)跳轉(zhuǎn)代碼指令，也也就是跳轉(zhuǎn)到運(yùn)行地址
//而不是編譯地址，不清楚的可以百度了!
LDR R1, = __initial_sp ; restore original stack pointer
MSR MSP, R1 //存儲(chǔ)堆棧指針
LDR R0, =__main //同樣的道理
BX R0
ENDP
; Dummy Exception Handlers (infinite loops which can be modified)
//下面的中斷都是不可返回的中斷跳轉(zhuǎn)，一般都是系自我保護(hù)的中斷跳轉(zhuǎn)
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
//輸出異常向量表標(biāo)號(hào)，方便外部實(shí)現(xiàn)異常的具體功能
[WEAK] 是弱定義的意思，如果外部定義了，優(yōu)先執(zhí)行外部定義，
否則下面的函數(shù)定義,明顯這是為了防止我們使用了中斷，卻沒(méi)有定義而準(zhǔn)備的。
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]
EXPORT EXTI2_IRQHandler [WEAK]
EXPORT EXTI3_IRQHandler [WEAK]
EXPORT EXTI4_IRQHandler [WEAK]
EXPORT DMA1_Channel1_IRQHandler [WEAK]
EXPORT DMA1_Channel2_IRQHandler [WEAK]
EXPORT DMA1_Channel3_IRQHandler [WEAK]
EXPORT DMA1_Channel4_IRQHandler [WEAK]
EXPORT DMA1_Channel5_IRQHandler [WEAK]
EXPORT DMA1_Channel6_IRQHandler [WEAK]
EXPORT DMA1_Channel7_IRQHandler [WEAK]
EXPORT ADC1_2_IRQHandler [WEAK]
EXPORT USB_HP_CAN1_TX_IRQHandler [WEAK]
EXPORT USB_LP_CAN1_RX0_IRQHandler [WEAK]
EXPORT CAN1_RX1_IRQHandler [WEAK]
EXPORT CAN1_SCE_IRQHandler [WEAK]
EXPORT EXTI9_5_IRQHandler [WEAK]
EXPORT TIM1_BRK_IRQHandler [WEAK]
EXPORT TIM1_UP_IRQHandler [WEAK]
EXPORT TIM1_TRG_COM_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 RTCAlarm_IRQHandler [WEAK]
EXPORT USBWakeUp_IRQHandler [WEAK]
EXPORT TIM8_BRK_IRQHandler [WEAK]
EXPORT TIM8_UP_IRQHandler [WEAK]
EXPORT TIM8_TRG_COM_IRQHandler [WEAK]
EXPORT TIM8_CC_IRQHandler [WEAK]
EXPORT ADC3_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_IRQHandler [WEAK]
EXPORT TIM7_IRQHandler [WEAK]
EXPORT DMA2_Channel1_IRQHandler [WEAK]
EXPORT DMA2_Channel2_IRQHandler [WEAK]
EXPORT DMA2_Channel3_IRQHandler [WEAK]
EXPORT DMA2_Channel4_5_IRQHandler [WEAK]
//不難看出這些個(gè)函數(shù)都是空函數(shù)，所以什么都不會(huì)做的，我們只要 重新定義和使用這些函數(shù)就行了，還有一點(diǎn)就是下面的中斷函數(shù)都是用的同一個(gè)地址
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