LPC1778启动代码分析.doc

LPC1788 启动代码分析 在Keil uVision4中新建一个基于NXP1788的工程后，会提示添加启动汇编代码startup_LPC177x_8x.S。该文件进行从汇编到C语言运行环境的初始化工作。 [cpp] view plaincopy ;/***************************************************************************** ; * @file: startup_LPC177x_8x.s ; * @purpose: CMSIS Cortex-M3 Core Device Startup File ; * for the NXP LPC177x_8x Device Series ; * @version: V1.20 ; * @date: 07. October 2010 ; *------- Use Configuration Wizard in Context Menu ------------------ ; * ; * Copyright (C) 2010 ARM Limited. All rights reserved. ; * ARM Limited (ARM) is supplying this software for use with Cortex-M3 ; * processor based microcontrollers. This file can be freely distributed ; * within development tools that are supporting such ARM based processors. ; * ; * THIS SOFTWARE IS PROVIDED AS IS. NO WARRANTIES, WHETHER EXPRESS, IMPLIED ; * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF ; * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. ; * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR ; * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER. ; * ; *****************************************************************************/ ; h Stack Configuration ; o Stack Size (in Bytes) 0x0-0xFFFFFFFF:8 ; /h Stack_Size EQU 0 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 0 AREA HEAP, NOINIT, READWRITE, ALIGN=3 __heap_base Heap_Mem SPACE Heap_Size __heap_limit PRESERVE8 THUMB ; Vector Table Mapped to Address 0 at Reset AREA RESET, DATA, READONLY EXPORT __Vectors __Vectors DCD __initial_sp ; Top of Stack