| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182 |
- ;//###########################################################################
- ;//
- ;// FILE: DSP2803x_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 DSP2803x 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: F2803x C/C++ Header Files and Peripheral Examples V130 $
- ;// $Release Date: May 8, 2015 $
- ;// $Copyright: Copyright (C) 2009-2015 Texas Instruments Incorporated -
- ;// http://www.ti.com/ ALL RIGHTS RESERVED $
- ;//###########################################################################
- ***********************************************************************
- 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.
- ;//===========================================================================
|
