113 lines
4.5 KiB
NASM
113 lines
4.5 KiB
NASM
;//###########################################################################
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;//
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;// FILE: F2837xD_CodeStartBranch.asm
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;//
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;// TITLE: Branch for redirecting code execution after boot.
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;//
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;// For these examples, code_start is the first code that is executed after
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;// exiting the boot ROM code.
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;//
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;// The codestart section in the linker cmd file is used to physically place
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;// this code at the correct memory location. This section should be placed
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;// at the location the BOOT ROM will re-direct the code to. For example,
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;// for boot to FLASH this code will be located at 0x3f7ff6.
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;//
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;// In addition, the example F2837xD projects are setup such that the codegen
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;// entry point is also set to the code_start label. This is done by linker
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;// option -e in the project build options. When the debugger loads the code,
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;// it will automatically set the PC to the "entry point" address indicated by
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;// the -e linker option. In this case the debugger is simply assigning the PC,
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;// it is not the same as a full reset of the device.
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;//
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;// The compiler may warn that the entry point for the project is other then
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;// _c_init00. _c_init00 is the C environment setup and is run before
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;// main() is entered. The code_start code will re-direct the execution
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;// to _c_init00 and thus there is no worry and this warning can be ignored.
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;//
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;//###########################################################################
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;//
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;// $Release Date: $
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;// $Copyright:
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;// Copyright (C) 2013-2023 Texas Instruments Incorporated - http://www.ti.com/
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;//
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;// Redistribution and use in source and binary forms, with or without
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;// modification, are permitted provided that the following conditions
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;// are met:
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;//
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;// Redistributions of source code must retain the above copyright
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;// notice, this list of conditions and the following disclaimer.
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;//
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;// Redistributions in binary form must reproduce the above copyright
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;// notice, this list of conditions and the following disclaimer in the
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;// documentation and/or other materials provided with the
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;// distribution.
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;//
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;// Neither the name of Texas Instruments Incorporated nor the names of
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;// its contributors may be used to endorse or promote products derived
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;// from this software without specific prior written permission.
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;//
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;// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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;// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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;// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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;// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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;// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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;// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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;// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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;// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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;// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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;// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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;// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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;// $
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;//###########################################################################
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***********************************************************************
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WD_DISABLE .set 1 ;set to 1 to disable WD, else set to 0
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.ref _c_int00
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.global code_start
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***********************************************************************
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* Function: codestart section
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*
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* Description: Branch to code starting point
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***********************************************************************
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.sect "codestart"
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.retain
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code_start:
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.if WD_DISABLE == 1
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LB wd_disable ;Branch to watchdog disable code
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.else
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LB _c_int00 ;Branch to start of boot._asm in RTS library
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.endif
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;end codestart section
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***********************************************************************
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* Function: wd_disable
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*
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* Description: Disables the watchdog timer
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***********************************************************************
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.if WD_DISABLE == 1
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.text
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wd_disable:
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SETC OBJMODE ;Set OBJMODE for 28x object code
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EALLOW ;Enable EALLOW protected register access
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MOVZ DP, #7029h>>6 ;Set data page for WDCR register
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MOV @7029h, #0068h ;Set WDDIS bit in WDCR to disable WD
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EDIS ;Disable EALLOW protected register access
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LB _c_int00 ;Branch to start of boot._asm in RTS library
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.endif
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;end wd_disable
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.end
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;//
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;// End of file.
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;//
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