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 plaincopy1 ;/* 2 ; * file: startup_LPC177x_8x.s 3 ; * purpose: CMSIS Cortex-M3 Core Device Startup File 4 ; * for the NXP LPC177x_8x Device Series 5 ; * version: V1.20 6 ; * date: 07. October 2010 7 ; *- - 8 ; * 9 ; * Copyright (C) 2010 ARM Limited. All rights reserved. 10 ; * ARM Limited (ARM) is supplying this software for use with Cortex-M3 11 ; * processor based microcontrollers. This file can be freely distributed 12 ; * within development tools that are supporting such ARM based processors. 13 ; * 14 ; * THIS SOFTWARE IS PROVIDED AS IS. NO WARRANTIES, WHETHER EXPRESS, IMPLIED 15 ; * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF 16 ; * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. 17 ; * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR 18 ; * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER. 19 ; * 20 ; */ 21 22 23 ; Stack Configuration 24 ; Stack Size (in Bytes) 25 ; 26 27 Stack_Size EQU 0x00000200 28 29 AREA STACK, NOINIT, READWRITE, ALIGN=3 30 Stack_Mem SPACE Stack_Size 31 _initial_sp 32 33 34 ; Heap Configuration 35 ; Heap Size (in Bytes) 36 ; 37 38 Heap_Size EQU 0x00000400 39 40 AREA HEAP, NOINIT, READWRITE, ALIGN=3 41 _heap_base 42 Heap_Mem SPACE Heap_Size 43 _heap_limit 44 45 46 PRESERVE8 47 THUMB 48 49 50 ; Vector Table Mapped to Address 0 at Reset 51 52 AREA RESET, DATA, READONLY 53 EXPORT _Vectors 54 55 _Vectors DCD _initial_sp ; Top of Stack 56 DCD Reset_Handler ; Reset Handler 57 DCD NMI_Handler ; NMI Handler 58 DCD HardFault_Handler ; Hard Fault Handler 59 DCD MemManage_Handler ; MPU Fault Handler 60 DCD BusFault_Handler ; Bus Fault Handler 61 DCD UsageFault_Handler ; Usage Fault Handler 62 DCD 0 ; Reserved 63 DCD 0 ; Reserved 64 DCD 0 ; Reserved 65 DCD 0 ; Reserved 66 DCD SVC_Handler ; SVCall Handler 67 DCD DebugMon_Handler ; Debug Monitor Handler 68 DCD 0 ; Reserved 69 DCD PendSV_Handler ; PendSV Handler 70 DCD SysTick_Handler ; SysTick Handler 71 72 ; External Interrupts 73 DCD WDT_IRQHandler ; 16: Watchdog Timer 74 DCD TIMER0_IRQHandler ; 17: Timer0 75 DCD TIMER1_IRQHandler ; 18: Timer1 76 DCD TIMER2_IRQHandler ; 19: Timer2 77 DCD TIMER3_IRQHandler ; 20: Timer3 78 DCD UART0_IRQHandler ; 21: UART0 79 DCD UART1_IRQHandler ; 22: UART1 80 DCD UART2_IRQHandler ; 23: UART2 81 DCD UART3_IRQHandler ; 24: UART3 82 DCD PWM1_IRQHandler ; 25: PWM1 83 DCD I2C0_IRQHandler ; 26: I2C0 84 DCD I2C1_IRQHandler ; 27: I2C1 85 DCD I2C2_IRQHandler ; 28: I2C2 86 DCD SPIFI_IRQHandler ; 29: SPIFI 87 DCD SSP0_IRQHandler ; 30: SSP0 88 DCD SSP1_IRQHandler ; 31: SSP1 89 DCD PLL0_IRQHandler ; 32: PLL0 Lock (Main PLL) 90 DCD RTC_IRQHandler ; 33: Real Time Clock 91 DCD EINT0_IRQHandler ; 34: External Interrupt 0 92 DCD EINT1_IRQHandler ; 35: External Interrupt 1 93 DCD EINT2_IRQHandler ; 36: External Interrupt 2 94 DCD EINT3_IRQHandler ; 37: External Interrupt 3 95 DCD ADC_IRQHandler ; 38: A/D Converter 96 DCD BOD_IRQHandler ; 39: Brown-Out Detect 97 DCD USB_IRQHandler ; 40: USB 98 DCD CAN_IRQHandler ; 41: CAN 99 DCD DMA_IRQHandler ; 42: General Purpose DMA 100 DCD I2S_IRQHandler ; 43: I2S 101 DCD ENET_IRQHandler ; 44: Ethernet 102 DCD MCI_IRQHandler ; 45: SD/MMC card I/F 103 DCD MCPWM_IRQHandler ; 46: Motor Control PWM 104 DCD QEI_IRQHandler ; 47: Quadrature Encoder Interface 105 DCD PLL1_IRQHandler ; 48: PLL1 Lock (USB PLL) 106 DCD USBActivity_IRQHandler ; 49: USB Activity interrupt to wakeup 107 DCD CANActivity_IRQHandler ; 50: CAN Activity interrupt to wakeup 108 DCD UART4_IRQHandler ; 51: UART4 109 DCD SSP2_IRQHandler ; 52: SSP2 110 DCD LCD_IRQHandler ; 53: LCD 111 DCD GPIO_IRQHandler ; 54: GPIO 112 DCD PWM0_IRQHandler ; 55: PWM0 113 DCD EEPROM_IRQHandler ; 56: EEPROM 114 115 116 IF :LNOT:DEF:NO_CRP 117 AREA |.ARM._at_0x02FC|, CODE, READONLY 118 CRP_Key DCD 0xFFFFFFFF 119 ENDIF 120 121 122 AREA |.text|, CODE, READONLY 123 124 125 ; Reset Handler 126 127 Reset_Handler PROC 128 EXPORT Reset_Handler WEAK 129 IMPORT SystemInit 130 IMPORT _main 131 LDR R0, =SystemInit 132 BLX R0 133 LDR R0, =_main 134 BX R0 135 ENDP 136 137 138 ; Dummy Exception Handlers (infinite loops which can be modified) 139 140 NMI_Handler PROC 141 EXPORT NMI_Handler WEAK 142 B . 143 ENDP 144 HardFault_Handler 145 PROC 146 EXPORT HardFault_Handler WEAK 147 B . 148 ENDP 149 MemManage_Handler 150 PROC 151 EXPORT MemManage_Handler WEAK 152 B . 153 ENDP 154 BusFault_Handler 155 PROC 156 EXPORT BusFault_Handler WEAK 157 B . 158 ENDP 159 UsageFault_Handler 160 PROC 161 EXPORT UsageFault_Handler WEAK 162 B . 163 ENDP 164 SVC_Handler PROC 165 EXPORT SVC_Handler WEAK 166 B . 167 ENDP 168 DebugMon_Handler 169 PROC 170 EXPORT DebugMon_Handler WEAK 171 B . 172 ENDP 173 PendSV_Handler PROC 174 EXPORT PendSV_Handler WEAK 175 B . 176 ENDP 177 SysTick_Handler PROC 178 EXPORT SysTick_Handler WEAK 179 B . 180 ENDP 181 182 Default_Handler PROC 183 184 EXPORT WDT_IRQHandler WEAK 185 EXPORT TIMER0_IRQHandler WEAK 186 EXPORT TIMER1_IRQHandler WEAK 187 EXPORT TIMER2_IRQHandler WEAK 188 EXPORT TIMER3_IRQHandler WEAK 189 EXPORT UART0_IRQHandler WEAK 190 EXPORT UART1_IRQHandler WEAK 191 EXPORT UART2_IRQHandler WEAK 192 EXPORT UART3_IRQHandler WEAK 193 EXPORT PWM1_IRQHandler WEAK 194 EXPORT I2C0_IRQHandler WEAK 195 EXPORT I2C1_IRQHandler WEAK 196 EXPORT I2C2_IRQHandler WEAK 197 EXPORT SPIFI_IRQHandler WEAK 198 EXPORT SSP0_IRQHandler WEAK 199 EXPORT SSP1_IRQHandler WEAK 200 EXPORT PLL0_IRQHandler WEAK 201 EXPORT RTC_IRQHandler WEAK 202 EXPORT EINT0_IRQHandler WEAK 203 EXPORT EINT1_IRQHandler WEAK 204 EXPORT EINT2_IRQHandler WEAK 205 EXPORT EINT3_IRQHandler WEAK 206 EXPORT ADC_IRQHandler WEAK 207 EXPORT BOD_IRQHandler WEAK 208 EXPORT USB_IRQHandler WEAK 209 EXPORT CAN_IRQHandler WEAK 210 EXPORT DMA_IRQHandler WEAK 211 EXPORT I2S_IRQHandler WEAK 212 EXPORT ENET_IRQHandler WEAK 213 EXPORT MCI_IRQHandler WEAK 214 EXPORT MCPWM_IRQHandler WEAK 215 EXPORT QEI_IRQHandler WEAK 216 EXPORT PLL1_IRQHandler WEAK 217 EXPORT USBActivity_IRQHandler WEAK 218 EXPORT CANActivity_IRQHandler WEAK 219 EXPORT UART4_IRQHandler WEAK 220 EXPORT SSP2_IRQHandler WEAK 221 EXPORT LCD_IRQHandler WEAK 222 EXPORT GPIO_IRQHandler WEAK 223 EXPORT PWM0_IRQHandler WEAK 224 EXPORT EEPROM_IRQHandler WEAK 225 226 WDT_IRQHandler 227 TIMER0_IRQHandler 228 TIMER1_IRQHandler 229 TIMER2_IRQHandler 230 TIMER3_IRQHandler 231 UART0_IRQHandler 232 UART1_IRQHandler 233 UART2_IRQHandler 234 UART3_IRQHandler 235 PWM1_IRQHandler 236 I2C0_IRQHandler 237 I2C1_IRQHandler 238 I2C2_IRQHandler 239 SPIFI_IRQHandler 240 SSP0_IRQHandler 241 SSP1_IRQHandler 242 PLL0_IRQHandler 243 RTC_IRQHandler 244 EINT0_IRQHandler 245 EINT1_IRQHandler 246 EINT2_IRQHandler 247 EINT3_IRQHandler 248 ADC_IRQHandler 249 BOD_IRQHandler 250 USB_IRQHandler 251 CAN_IRQHandler 252 DMA_IRQHandler 253 I2S_IRQHandler 254 ENET_IRQHandler 255 MCI_IRQHandler 256 MCPWM_IRQHandler 257 QEI_IRQHandler 258 PLL1_IRQHandler 259 USBActivity_IRQHandler 260 CANActivity_IRQHandler 261 UART4_IRQHandler 262 SSP2_IRQHandler 263 LCD_IRQHandler 264 GPIO_IRQHandler 265 PWM0_IRQHandler 266 EEPROM_IRQHandler 267 268 B . 269 270 ENDP 271 272 273 ALIGN 274 275 276 ; User Initial Stack & Heap 277 278 IF :DEF:_MICROLIB 279 280 EXPORT _initial_sp 281 EXPORT _heap_base 282 EXPORT _heap_limit 283 284 ELSE 285 286 IMPORT _use_two_region_memory 287 EXPORT _user_initial_stackheap 288 _user_initial_stackheap 289 290 LDR R0, = Heap_Mem 291 LDR R1, =(Stack_Mem + Stack_Size) 292 LDR R2, = (Heap_Mem + Heap_Size) 293 LDR R3, = Stack_Mem 294 BX LR 295 296 ALIGN 297 298 ENDIF 299 300 301 END 程序完成如下内容的工作： 开辟一块大小为Stack_Size的栈空间； 标号_initial_sp指向栈顶位置； 定义堆空间大小为