基于LPC1114的M0启动流程分析
作者:解琛
时间:2020 年 8 月 1 日
一、.s 启动进程
首先关注 LPC1114 的启动文件,为了低成本的需要,使用芯片内部的晶振,所以这里需要对启动文件进行修改。
先看一下 startup_LPC11xx.s 文件,其代码如下。
;/**************************************************************************//**
; * @file startup_LPC11xx.s
; * @brief CMSIS Cortex-M0 Core Device Startup File
; * for the NXP LPC11xx/LPC11Cxx Device Series
; * @version V1.10
; * @date 24. November 2010
; *------- <<< Use Configuration Wizard in Context Menu >>> ------------------
; *
; * @note
; * Copyright (C) 2009-2010 ARM Limited. All rights reserved.
; *
; * @par
; * ARM Limited (ARM) is supplying this software for use with Cortex-M
; * processor based microcontrollers. This file can be freely distributed
; * within development tools that are supporting such ARM based processors.
; *
; * @par
; * 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 0x00000400
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 0x00000000
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
DCD Reset_Handler ; Reset Handler
DCD NMI_Handler ; NMI Handler
DCD HardFault_Handler ; Hard Fault Handler
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD SVC_Handler ; SVCall Handler
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD PendSV_Handler ; PendSV Handler
DCD SysTick_Handler ; SysTick Handler
; External Interrupts
DCD WAKEUP_IRQHandler ; 16+ 0: Wakeup PIO0.0
DCD WAKEUP_IRQHandler ; 16+ 1: Wakeup PIO0.1
DCD WAKEUP_IRQHandler ; 16+ 2: Wakeup PIO0.2
DCD WAKEUP_IRQHandler ; 16+ 3: Wakeup PIO0.3
DCD WAKEUP_IRQHandler ; 16+ 4: Wakeup PIO0.4
DCD WAKEUP_IRQHandler ; 16+ 5: Wakeup PIO0.5
DCD WAKEUP_IRQHandler ; 16+ 6: Wakeup PIO0.6
DCD WAKEUP_IRQHandler ; 16+ 7: Wakeup PIO0.7
DCD WAKEUP_IRQHandler ; 16+ 8: Wakeup PIO0.8
DCD WAKEUP_IRQHandler ; 16+ 9: Wakeup PIO0.9
DCD WAKEUP_IRQHandler ; 16+10: Wakeup PIO0.10
DCD WAKEUP_IRQHandler ; 16+11: Wakeup PIO0.11
DCD WAKEUP_IRQHandler ; 16+12: Wakeup PIO1.0
DCD CAN_IRQHandler ; 16+13: CAN
DCD SSP1_IRQHandler ; 16+14: SSP1
DCD I2C_IRQHandler ; 16+15: I2C
DCD TIMER16_0_IRQHandler ; 16+16: 16-bit Counter-Timer 0
DCD TIMER16_1_IRQHandler ; 16+17: 16-bit Counter-Timer 1
DCD TIMER32_0_IRQHandler ; 16+18: 32-bit Counter-Timer 0
DCD TIMER32_1_IRQHandler ; 16+19: 32-bit Counter-Timer 1
DCD SSP0_IRQHandler ; 16+20: SSP0
DCD UART_IRQHandler ; 16+21: UART
DCD USB_IRQHandler ; 16+22: USB IRQ
DCD USB_FIQHandler ; 16+24: USB FIQ
DCD ADC_IRQHandler ; 16+24: A/D Converter
DCD WDT_IRQHandler ; 16+25: Watchdog Timer
DCD BOD_IRQHandler ;