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楼主 |
发表于 2012-6-18 10:46:52
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回复【2楼】正点原子:
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我写过了，在main程序的第一行就是清空RAM的程序;
main()
{
RAM_Erase();//自己写的RAM_Erase()程序
...
...
变量赋值与其它子程序
...
...
}
这个程序能实现将RAM区域清空，但是由于main程序中要调用其它文件里定义的全局变量，而且其中有些变量是赋了初值的。执行RAM_Erase()之后，这些变量赋的初值也没有了，导致程序不能正常运行。
我观察过RAM区域，在编译器（keil uVersion4)编译完成后就自动对一些没有赋初值的全局变量赋0值。而对程序中赋了初值的全局变量在相应的RAM空间就是赋的初值。
所以在main函数中清零的操作是不可行的，我想大概要在上电启动后就先清空整个RAM区域，然后再编译才能保证所有的变量与被赋的值的准确性。
我的这个工程里有个很老的*.s文件，请各位大侠帮忙看看能不能在这里作点文章，清空RAM区域，不胜感激！
;// <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>
;// </h>
Stack_Size EQU 0x00004200
; AREA STACK, NOINIT, READWRITE, ALIGN=3
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 0x00000000
AREA HEAP, NOINIT, READWRITE, ALIGN=3
__heap_base
Heap_Mem SPACE Heap_Size
__heap_limit
 RESERVE8
THUMB
; Vector Table Mapped to Address 0 at Reset
AREA RESET, DATA, READONLY
EXTERN NMIException
EXTERN HardFaultException
EXTERN MemManageException
EXTERN BusFaultException
EXTERN UsageFaultException
EXTERN SVCHandler
EXTERN DebugMonitor
EXTERN endSVC
EXTERN SysTickHandler
EXPORT __Vectors
__Vectors DCD __initial_sp ; Top of Stack
DCD Reset_Handler ; Reset Handler
DCD NMIException ; NMI Handler
DCD HardFaultException ; Hard Fault Handler
DCD MemManageException ; MPU Fault Handler
DCD BusFaultException ; Bus Fault Handler
DCD UsageFaultException ; Usage Fault Handler
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD SVCHandler ; SVCall Handler
DCD DebugMonitor ; Debug Monitor Handler
DCD 0 ; Reserved
DCD endSVC ; endSV Handler
DCD SysTickHandler ; SysTick Handler
; External Interrupts
EXTERN WWDG_IRQHandler
EXTERN VD_IRQHandler
EXTERN TAMPER_IRQHandler
EXTERN RTC_IRQHandler
EXTERN FLASH_IRQHandler
EXTERN RCC_IRQHandler
EXTERN EXTI0_IRQHandler
EXTERN EXTI1_IRQHandler
EXTERN EXTI2_IRQHandler
EXTERN EXTI3_IRQHandler
EXTERN EXTI4_IRQHandler
EXTERN DMAChannel1_IRQHandler
EXTERN DMAChannel2_IRQHandler
EXTERN DMAChannel3_IRQHandler
EXTERN DMAChannel4_IRQHandler
EXTERN DMAChannel5_IRQHandler
EXTERN DMAChannel6_IRQHandler
EXTERN DMAChannel7_IRQHandler
EXTERN ADC_IRQHandler
EXTERN USB_HP_CAN_TX_IRQHandler
EXTERN USB_LP_CAN_RX0_IRQHandler
EXTERN CAN_RX1_IRQHandler
EXTERN CAN_SCE_IRQHandler
EXTERN EXTI9_5_IRQHandler
EXTERN TIM1_BRK_IRQHandler
EXTERN TIM1_UP_IRQHandler
EXTERN TIM1_TRG_COM_IRQHandler
EXTERN TIM1_CC_IRQHandler
EXTERN TIM2_IRQHandler
EXTERN TIM3_IRQHandler
EXTERN TIM4_IRQHandler
EXTERN I2C1_EV_IRQHandler
EXTERN I2C1_ER_IRQHandler
EXTERN I2C2_EV_IRQHandler
EXTERN I2C2_ER_IRQHandler
EXTERN SPI1_IRQHandler
EXTERN SPI2_IRQHandler
EXTERN USART1_IRQHandler
EXTERN USART2_IRQHandler
EXTERN USART3_IRQHandler
EXTERN EXTI15_10_IRQHandler
EXTERN RTCAlarm_IRQHandler
EXTERN USBWakeUp_IRQHandler
DCD WWDG_IRQHandler ; Window Watchdog
DCD VD_IRQHandler ; VD 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 riority or CAN TX
DCD USB_LP_CAN_RX0_IRQHandler ; USB Low riority 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
; Reset Handler
Reset_Handler ROC
EXPORT Reset_Handler [WEAK]
IMPORT __main
LDR R0, =__main
BX R0
ENDP
ALIGN
; User Initial Stack & Heap
IF  EF:__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 |
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发表于 2012-6-18 09:21:35
发表于 2012-6-18 09:31:28
