DSP2833x增加代码跳转文件

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DSP2833x增加代码跳转文件 [复制链接]

同时我们还需要在原有的调试程序项目中添加跳转代码文件DSP2833x_CodeStartBranch.asm，在处理器完成引导后跳转到用户应用过程入口。

同一芯片对应的DSP2833x_CodeStartBranch.asm文件也相同，因此我们可以从其他例程中拷贝或者自己添加该文件，文件内容如下：

注意：以下内容只试用于TMS320F28335!

;// TI File $Revision: /main/1 $
;// Checkin $Date: August 18, 2006   13:45:55 $
;//###########################################################################
;//
;// FILE:  DSP2833x_CodeStartBranch.asm
;//
;// TITLE: Branch for redirecting code execution after boot.
;//
;// For these examples, code_start is the first code that is executed after
;// exiting the boot ROM code.
;//
;// The codestart section in the linker cmd file is used to physically place
;// this code at the correct memory location.  This section should be placed
;// at the location the BOOT ROM will re-direct the code to.  For example,
;// for boot to FLASH this code will be located at 0x3f7ff6.
;//
;// In addition, the example DSP2833x projects are setup such that the codegen
;// entry point is also set to the code_start label.  This is done by linker
;// option -e in the project build options.  When the debugger loads the code,
;// it will automatically set the PC to the "entry point" address indicated by
;// the -e linker option.  In this case the debugger is simply assigning the PC,
;// it is not the same as a full reset of the device.
;//
;// The compiler may warn that the entry point for the project is other then
;//  _c_init00.  _c_init00 is the C environment setup and is run before
;// main() is entered. The code_start code will re-direct the execution
;// to _c_init00 and thus there is no worry and this warning can be ignored.
;//
;//###########################################################################
;// $TI Release: DSP2833x/DSP2823x C/C++ Header Files V1.31 $
;// $Release Date: August 4, 2009 $
;//###########################################################################


***********************************************************************

WD_DISABLE  .set    1       ;set to 1 to disable WD, else set to 0

    .ref _c_int00
    .global code_start

***********************************************************************
* Function: codestart section
*
* Description: Branch to code starting point
***********************************************************************

    .sect "codestart"

code_start:
    .if WD_DISABLE == 1
         LB wd_disable       ;Branch to watchdog disable code
    .else
        LB _c_int00         ;Branch to start of boot.asm in RTS library
    .endif

;end codestart section


***********************************************************************
* Function: wd_disable
*
* Description: Disables the watchdog timer
***********************************************************************
    .if WD_DISABLE == 1

    .text
wd_disable:
    SETC OBJMODE        ;Set OBJMODE for 28x object code
    EALLOW              ;Enable EALLOW protected register access
    MOVZ DP, #7029h>>6  ;Set data page for WDCR register
    MOV @7029h, #0068h  ;Set WDDIS bit in WDCR to disable WD
    EDIS                ;Disable EALLOW protected register access
    LB _c_int00         ;Branch to start of boot.asm in RTS library

    .endif
;end wd_disable
    .end

;//===========================================================================
;// End of file.
;//===========================================================================