【.Net Micro Framework PortingKit - 04】修改启动代码&重写向量表

时间:2021-11-12 02:42:35

   在上三篇《移植初步:环境搭建》《STM3210E平台构建》《调试初步:点亮LED》文章中,我们介绍了如何搭建开发环境,并初步写了测试代码,下一步我们将根据Cortex-M3的架构特点,修改启动代码和重写中断向量表。

   Cortex-M3的中断架构非常有特色,芯片内建一个嵌套向量中断控制器NVIC(Nested Vectored Interrupt Controller),它与内核是紧耦合的,提供如下的功能:可嵌套中断支持,向量中断支持,动态优先级调整支持,中断延迟大大缩短,中断可屏蔽。NVIC 支持240 个优先级可动态配置的中断,每个中断的优先级有256 个选择。低延迟的中断处理可以通过紧耦合的NVIC 和处理器内核接口来实现,让新进的中断可以得到有效的处理。NVIC通过时刻关注压栈(嵌套)中断来实现中断的末尾连锁(tail-chaining)。

   .Net Micro Framework的中断处理构建在Cortex-M3的中断架构之上,将大大提升的.Net Micro Framework的实时性能,不过由于架构全新,需要大幅度改写.Net Micro Framework原有中断处理代码,不破不立,这对性能有所诟病的.Net Micro Framework也许是个好事情。

    下面就新中断架构,进行代码改写。

 

    1、修改FirstEntry.s代码

    由于废弃了./devicecode/cores/arm/assemblycode/thumb2/rvd_s/VectorsHanlers.s 所以为了编译通过,我们要在同目录下的FirstEntry.s中添加一些代码,

在文件头添加如下代码:    

     EXPORT  HARD_Breakpoint

    ;IMPORT  HARD_Breakpoint_Handler   ; HARD_Breakpoint_Handler(unsigned int*, unsigned int, unsigned int)

 

在文件尾“END”命令前添加如下代码:

    ;AREA ||i.HARD_Breakpoint||, CODE, READONLY     ; void HARD_Breakpoint()

HARD_Breakpoint

    ; on entry, were are being called from C/C++ in system mode

    ;b       HARD_Breakpoint_Handler     ; address of vector routine in C to jump to, never expect to return

 

    2、重写中断向量表(VectorsTrampolines.s

        重写同目录下的VectorsTrampolines.s文件为如下内容:

     ; 导入异常或中断处理程序

         IMPORT  NMIException

         IMPORT  HardFaultException

         IMPORT  MemManageException

         IMPORT  BusFaultException

         IMPORT  UsageFaultException

         IMPORT  SVCHandler

         IMPORT  DebugMonitor

         IMPORT  PendSVC

         IMPORT  SysTickHandler

         IMPORT  WWDG_IRQHandler

         IMPORT  PVD_IRQHandler

         IMPORT  TAMPER_IRQHandler

         IMPORT  RTC_IRQHandler

         IMPORT  FLASH_IRQHandler

         IMPORT  RCC_IRQHandler

         IMPORT  EXTI0_IRQHandler

         IMPORT  EXTI1_IRQHandler

         IMPORT  EXTI2_IRQHandler

         IMPORT  EXTI3_IRQHandler

         IMPORT  EXTI4_IRQHandler

         IMPORT  DMA1_Channel1_IRQHandler

         IMPORT  DMA1_Channel2_IRQHandler

         IMPORT  DMA1_Channel3_IRQHandler

         IMPORT  DMA1_Channel4_IRQHandler

         IMPORT  DMA1_Channel5_IRQHandler

         IMPORT  DMA1_Channel6_IRQHandler

         IMPORT  DMA1_Channel7_IRQHandler

         IMPORT  ADC1_2_IRQHandler

         IMPORT  USB_HP_CAN_TX_IRQHandler

         IMPORT  USB_LP_CAN_RX0_IRQHandler

         IMPORT  CAN_RX1_IRQHandler

         IMPORT  CAN_SCE_IRQHandler

         IMPORT  EXTI9_5_IRQHandler

         IMPORT  TIM1_BRK_IRQHandler

         IMPORT  TIM1_UP_IRQHandler

         IMPORT  TIM1_TRG_COM_IRQHandler

         IMPORT  TIM1_CC_IRQHandler

         IMPORT  TIM2_IRQHandler

         IMPORT  TIM3_IRQHandler

         IMPORT  TIM4_IRQHandler

         IMPORT  I2C1_EV_IRQHandler

         IMPORT  I2C1_ER_IRQHandler

         IMPORT  I2C2_EV_IRQHandler

         IMPORT  I2C2_ER_IRQHandler

         IMPORT  SPI1_IRQHandler

         IMPORT  SPI2_IRQHandler

         IMPORT  USART1_IRQHandler

         IMPORT  USART2_IRQHandler

         IMPORT  USART3_IRQHandler

         IMPORT  EXTI15_10_IRQHandler

         IMPORT  RTCAlarm_IRQHandler

         IMPORT  USBWakeUp_IRQHandler

         IMPORT  TIM8_BRK_IRQHandler

         IMPORT  TIM8_UP_IRQHandler

         IMPORT  TIM8_TRG_COM_IRQHandler

         IMPORT  TIM8_CC_IRQHandler

         IMPORT  ADC3_IRQHandler

         IMPORT  FSMC_IRQHandler

         IMPORT  SDIO_IRQHandler

         IMPORT  TIM5_IRQHandler

         IMPORT  SPI3_IRQHandler

         IMPORT  UART4_IRQHandler

         IMPORT  UART5_IRQHandler

         IMPORT  TIM6_IRQHandler

         IMPORT  TIM7_IRQHandler

         IMPORT  DMA2_Channel1_IRQHandler

         IMPORT  DMA2_Channel2_IRQHandler

         IMPORT  DMA2_Channel3_IRQHandler

         IMPORT  DMA2_Channel4_5_IRQHandler

 

 

    EXPORT  ARM_Vectors

 

    IMPORT  StackTop

    IMPORT  EntryPoint

   

;*****************************************************************************

 

    AREA |.text|, CODE, READONLY

 

    ;向量表

ARM_Vectors

         DCD  StackTop                   ; Top of Stack  栈顶

         DCD  EntryPoint                                    ; 复位

         DCD  NMIException

         DCD  HardFaultException

         DCD  MemManageException

         DCD  BusFaultException

         DCD  UsageFaultException

         DCD  0                 ; Reserved

         DCD  0                 ; Reserved

         DCD  0                 ; Reserved

         DCD  0                 ; Reserved

         DCD  SVCHandler

         DCD  DebugMonitor

         DCD  0                 ; Reserved

         DCD  PendSVC

         DCD  SysTickHandler

         DCD  WWDG_IRQHandler

         DCD  PVD_IRQHandler

         DCD  TAMPER_IRQHandler

         DCD  RTC_IRQHandler

         DCD  FLASH_IRQHandler

         DCD  RCC_IRQHandler

         DCD  EXTI0_IRQHandler

         DCD  EXTI1_IRQHandler

         DCD  EXTI2_IRQHandler

         DCD  EXTI3_IRQHandler

         DCD  EXTI4_IRQHandler

         DCD  DMA1_Channel1_IRQHandler

         DCD  DMA1_Channel2_IRQHandler

         DCD  DMA1_Channel3_IRQHandler

         DCD  DMA1_Channel4_IRQHandler

         DCD  DMA1_Channel5_IRQHandler

         DCD  DMA1_Channel6_IRQHandler

         DCD  DMA1_Channel7_IRQHandler

         DCD  ADC1_2_IRQHandler

         DCD  USB_HP_CAN_TX_IRQHandler

         DCD  USB_LP_CAN_RX0_IRQHandler

         DCD  CAN_RX1_IRQHandler

         DCD  CAN_SCE_IRQHandler

         DCD  EXTI9_5_IRQHandler

         DCD  TIM1_BRK_IRQHandler

         DCD  TIM1_UP_IRQHandler

         DCD  TIM1_TRG_COM_IRQHandler

         DCD  TIM1_CC_IRQHandler

         DCD  TIM2_IRQHandler

         DCD  TIM3_IRQHandler

         DCD  TIM4_IRQHandler

         DCD  I2C1_EV_IRQHandler

         DCD  I2C1_ER_IRQHandler

         DCD  I2C2_EV_IRQHandler

         DCD  I2C2_ER_IRQHandler

         DCD  SPI1_IRQHandler

         DCD  SPI2_IRQHandler

         DCD  USART1_IRQHandler

         DCD  USART2_IRQHandler

         DCD  USART3_IRQHandler

         DCD  EXTI15_10_IRQHandler

         DCD  RTCAlarm_IRQHandler

         DCD  USBWakeUp_IRQHandler

         DCD  TIM8_BRK_IRQHandler

         DCD  TIM8_UP_IRQHandler

         DCD  TIM8_TRG_COM_IRQHandler

         DCD  TIM8_CC_IRQHandler

         DCD  ADC3_IRQHandler

         DCD  FSMC_IRQHandler

         DCD  SDIO_IRQHandler

         DCD  TIM5_IRQHandler

         DCD  SPI3_IRQHandler

         DCD  UART4_IRQHandler

         DCD  UART5_IRQHandler

         DCD  TIM6_IRQHandler

         DCD  TIM7_IRQHandler

         DCD  DMA2_Channel1_IRQHandler

         DCD  DMA2_Channel2_IRQHandler

         DCD  DMA2_Channel3_IRQHandler

         DCD  DMA2_Channel4_5_IRQHandler

 

 

;*****************************************************************************

 

    END

3、新建VectorsHandler_Temp库文件

    ./DeviceCode/Targets/Native/CortexM3/DeviceCode目录下,新建目录VectorsHandler_Temp,并新建两个文件dotNetMF.proj(编译配置,可参见其它同类文件),VectorsHandler_Temp.c(空的中断处理函数)。

 

    VectorsHandler_Temp.c的内容如下:

    void NMIException(void) {}

    void HardFaultException(void){while (1);}

    void MemManageException(void){while (1);}

    void BusFaultException(void){while (1);}

    void UsageFaultException(void){while (1);}

    void DebugMonitor(void){}

    void SVCHandler(void){}

 

    // 省略部分代码 .....

 

    void TIM6_IRQHandler(void){}

    void TIM7_IRQHandler(void){}

    void DMA2_Channel1_IRQHandler(void){}

    void DMA2_Channel2_IRQHandler(void){}

    void DMA2_Channel3_IRQHandler(void){}

    void DMA2_Channel4_5_IRQHandler(void){}

    以上函数为暂且为空,以后我们在根据需要再添加相应的中断处理代码。

 

4dotNetMF.proj文件调整

   1)对./DeviceCode/cores/arm/dotNetMF.proj文件做如下调整:

  <ItemGroup Condition="'$(INSTRUCTION_SET)'=='thumb2'">

    <Compile Include="AssemblyCode/thumb2/$(AS_SUBDIR)/FirstEntry.s" />

    <Compile Include="AssemblyCode/thumb2/$(AS_SUBDIR)/IDelayLoop.s" />

    <Compile Include="AssemblyCode/thumb2/$(AS_SUBDIR)/Sampling_Profiler_RAM.s" />

    <Compile Include="AssemblyCode/thumb2/$(AS_SUBDIR)/VectorsHandlers.s" />

    <Compile Include="AssemblyCode/thumb2/$(AS_SUBDIR)/VectorsTrampolines.s" />

  </ItemGroup>

  修改为:

  <ItemGroup Condition="'$(INSTRUCTION_SET)'=='thumb2'">

    <Compile Include="AssemblyCode/thumb2/$(AS_SUBDIR)/FirstEntry.s" />

    <Compile Include="AssemblyCode/thumb2/$(AS_SUBDIR)/VectorsTrampolines.s" />

  </ItemGroup>

  

  <ItemGroup>

    <HFiles Include="../../Initialization/MasterConfig.h" />

    <Compile Include="Diagnostics/Aborts.cpp" />

    <Compile Include="Diagnostics/FIQ_Profiler.cpp" />

    <Compile Include="Diagnostics/RamTest.cpp" />

    <Compile Include="Diagnostics/RamTest.h" />

    <LIB_FIRSTENTRY_OBJ Include="$(OBJ_DIR)/FirstEntry.$(OBJ_EXT)" />

  </ItemGroup>

  修改为:

  <ItemGroup>

    <LIB_FIRSTENTRY_OBJ Include="$(OBJ_DIR)/FirstEntry.$(OBJ_EXT)" />

  </ItemGroup>

 

  2)在./Solutions/STM3210E/NativeSample/NativeSample.proj文件中添加如下内容:

  <ItemGroup>

    <RequiredProjects Include="$(SPOCLIENT)/DeviceCode/Targets/Native/CortexM3/DeviceCode/VectorsHandler_Temp/dotNetMF.proj" />

    <DriverLibs Include="VectorsHandler_Temp.$(LIB_EXT)" />

  </ItemGroup> 

 

5、编译

   编译我们的代码,看看是否能编译成功。编译成功后,在用MDK下载的开发板试一试,如果运行正常,这一步工作将告一段落。下一步我们将编写SRAM初始化代码和设置NVIC中断表偏移。