lpc2100 启动代码.txt

LPC21XX 系列启动文件,包括栈设置,中断跳入,OSC设置

LPC2100 启动代码心得与大家分享！1、将寄存器定义到ARM_LPC2000，并用 INCLUDE ARM_LPC2000.INC 包含到主程序文件开头，注意INCLUDE要顶格。

2、设置Targets Settings中Post-linker要选择 ARM fromELF，并在 ARM fromELF设置中使用二进制 plain binary.

3、设置Targets Settings中ARM Linker的Output页的Linktype为**，并设 RO Base = 0x0, RW Base = 0x40000000

4、建立工程时要不要选择周立功的向导，直接用最上面第一项

以下是代码：

INCLUDE ARM_LPC2000.INC
GBLL TargetDowload
GBLL DebugTesting
; GBLL SecurePretect
GBLL PhaseLockLoop

;;===========================================================================================
u0_baud   EQU  115200   ; 115200 = 0x1C200; 11059200 = 0xA8C000; 
Fosc   EQU  11059200        ; Crystal frequence：11059200/27648000/55296000。
Fcclk   EQU  (Fosc  * 4 )    ; 系统频率，必须为Fosc的整数倍(1~32)，且<=60MHZ。
Fcco   EQU  (Fcclk * 4)     ; CCO频率，必须为Fcclk的2、4、8、16倍，范围为156MHz~320MHz。
Fpclk   EQU  (Fcclk / 4) * 1 ; VPB时钟频率，只能为(Fcclk / 4)的1、2、4倍。
; ===========================================================================================
SVC_STACK_LEGTH         EQU         0
FIQ_STACK_LEGTH         EQU         0
IRQ_STACK_LEGTH         EQU         256
ABT_STACK_LEGTH         EQU         0
UND_STACK_LEGTH         EQU         0

; ===========================================================================================
;  程序部分：初始化及中断向量
;  
; ===========================================================================================
AREA Initialize,CODE,READONLY    ; AREA 段名(独立) CODE|DATA| 属性
ENTRY 
CODE32    ; CODE32: 以下为 ARM 指令；CODE16: 以下为 THUMB 指令
; ===========================================================================================
Reset
LDR  PC, Reset_Address           ;; 0x00-复位异常向量
LDR  PC, Undefine_Address         ;; 0x04-未定义指令异常
LDR  PC, SWI_Address           ;; 0x08-SWI 异常
LDR  PC, PrefetchAbort_Address      ;; 0x0C-指令预取中止异常
LDR  PC, DataAbort_Address       ;; 0x10-数据预取中止异常
DCD  0xb9205f88          ;; 为使向量表所有32位数据累加和为零而补数，LPC2000系列仅校验0x00~0x1F
    LDR  PC, [PC,#-0x0FF0]        ;; 0x18-IRQ 异常    PC执行完本指令后指向0x20,此时PC-#0xFF0=0xFFFFF030，正是VICVectAddr地址
LDR  PC, FIQ_Address         ;; 0x1C-FIQ 异常

Reset_Address   DCD  Reset_Initialize   ;; 返回：BL => MOV PC,LR
Undefine_Address  DCD  Undefine_Handler   ;; 返回：MOVS  PC,R14_und
SWI_Address    DCD  SWI_Handler     ;; 返回：MOVS  PC,R14_svc
PrefetchAbort_Address DCD  PrefetchAbort_Handler  ;; 返回：SUBS  PC,R14_abt,#04
DataAbort_Address  DCD  DataAbort_Handler   ;; 返回：SUBS  PC,R14_abt,#08
FIQ_Address    DCD  FIQ_Handler     ;; 返回：SUBS  PC,R14_fiq,#04

; ===========================================================================================
Undefine_Handler  B  .
SWI_Handler    B  SWI_Exception
PrefetchAbort_Handler B  .
DataAbort_Handler  B  .
FIQ_Handler
STMFA SP!, {R0-R3, LR}
BL  FIQ_Exception
LDMFA SP!, {R0-R3, LR}
SUBS PC, LR, #4

;;*******************************************************************************************
;;===============  SWI 调用 ===============

; MOV R0,#0x12
; MOV R1,#0x31     ;;  调用0x12(R0)号软中断的0x31(R1)号子功能。
; SWI 0       ;; 相当于 mov r0,#0x31; swi #0x12

SWI_Exception            ;; SWI: CPU Mode exchanging!
MOV PC,LR

FIQ_Exception            ;; FIQ: Winthin 27 clock!
MOV PC,LR
; ===========================================================================================
;        InitStack & InitTarget
; ===========================================================================================
InitStack
MOV R0,LR
MSR CPSR_c,#0x000000D3
LDR R1,=SvcStackSpace
MOV SP,R1

MSR CPSR_c,#0x000000D2
LDR R1,=IrqStackSpace
MOV SP,R1

MSR CPSR_c,#0x000000D1
LDR R1,=FiqStackSpace
MOV SP,R1

MSR CPSR_c,#0x000000D7
LDR R1,=AbtStackSpace
MOV SP,R1

MSR CPSR_c,#0x000000Db
LDR R1,=UndtStackSpace
MOV SP,R1

MSR CPSR_c,#0x0000005F  ;#0x000000DF修改，打开中断
LDR SP,=StackUSR
MOV PC,R0

InitTarget
  ldr r0,=0xe01fc000
;; /* Set Up ReMap */
  mov      r1,#1    ;;1->#0xe01fc040: image to Flash,Boot loader; ;;0x02: image to RAM,User program
  str      r1,[r0,#0x40]

    if  :def:  PhaseLockLoop  ;;/////////////
;; /* Set system timers for each component */
mov      r1,#1     ;;   1-enable
strb     r1,[r0,#0x80]   ;; Step1:Enable PLL by PLLCON(0xe01fc080)

if (Fpclk/(Fcclk/4)) = 1  ;; Step2:Setup reg_VPBDIV
  mov      r2,#0
  strb     r2,[r0,#0x100]
endif
if (Fpclk/(Fcclk/4)) = 2
  mov      r2,#2
  strb     r2,[r0,#0x100]
endif
if (Fpclk/(Fcclk/4)) = 4
  mov      r2,#1    ;;  MEMVALB VPBDIV,0x00010001
  strb     r2,[r0,#0x100]  ;;  Fcclk/Fpclk 比值： =1:00，=2:10，=4:01; b7~4=b3~0
endif

if (Fcco/Fcclk) = 2    ;; Step3:Setup reg_PLLCFG
  MEMVALB PLLCFG,((Fcclk/Fosc) - 1)|(0<<5)
endif
if (Fcco/Fcclk) = 4
  mov      r1,#0x23   ;;  MEMVALB PLLCFG,((Fcclk/Fosc) - 1)|(1<<5)
  strb     r1,[r0,#0x84]
endif
if (Fcco/Fcclk) = 8
  MEMVALB PLLCFG,((Fcclk/Fosc) - 1)|(2<<5)
endif
if (Fcco/Fcclk) = 16
  MEMVALB PLLCFG,((Fcclk/Fosc) - 1)|(3<<5)
endif

mov      r3,#0xaa
strb     r3,[r0,#0x8c]   ;; PLLFEED = 0xAA;
mov      r12,#0x55    ;; PLLFEED = 0x55;
strb     r12,[r0,#0x8c]

ldrh     r1,[r0,#0x88]  ;;PLLSTAT
tst      r1,#0x400   ;;  Test PLLSTAT_bit10 = 1?
beq      {PC} - 12   ;; Step5:waiting until LOCK signal.

mov      r1,#3    ;;PLLCON 3-connect
strb     r1,[r0,#0x80]  ;; Step6:Connect PLL

strb     r3,[r0,#0x8c]
strb     r12,[r0,#0x8c]  ;; Step7:Feedback 0xaa,0x55 once more to avalid setting!
endif      ;;/////////////

if :def: TargetDowload  ;;////####
;; /* Set memory accelerater module*/
MEMVALB MAMCR,0x0000  ;; Step1:disable MAM.
if Fcclk < 20000000
  MEMVALB MAMTIM,0x0001
else 
if Fcclk < 40000000
  MEMVALB MAMTIM,0x0002
else
  MEMVALB MAMTIM,0x0003
endif
endif
MEMVALB MAMCR,0x0000  ;; Step2: enable MAM.

;----------- Set Up VIC:
mvn      r0,#0    ;; r0 = 0xffffffff
mov      r2,#0
str      r0,[r2,#-0xfec] ;;VICIntEnClr = 0xffffffff
str      r2,[r2,#-0xfd0] ;;VICVectAddr = 0x0
str      r2,[r2,#-0xff4] ;;VICIntSelect= 0x0
endif      ;;////####

mov pc,lr
; ===========================================================================================
Reset_Initialize
  BL InitStack
  BL InitTarget
  B InitSystem
; ===========================================================================================
__user_initial_stackheap
    LDR   r0,=bottom_of_heap
;    LDR   r1,=StackUSR
    MOV   pc,lr
; =========================================================================================== 
if :def: SecurePretect
  if :def: EN_CRP     ;; 芯片加密：向地址0x1FC处写0x87654321 便实现了ARM7加密，只能ISP擦除。
         if  . >= 0x1FC
         INFO    1,"\nThe data at 0x000001fc must be 0x87654321."
         endif
CrpData
     while . < 0x1FC
     NOP
     wend
CrpData1                    ;; 对于LPC2100系列ARM7核:
     DCD     0x87654331  ;; When the Data is 0x87654321 on address_0x1FC,user code be protected.
     endif
   endif
; ===========================================================================================    
; 设置 ARM Linker 类型：Simple image 的 RO Base: 0x00000000; RW Base: 0x40000300。
; 或  Command Line：-info totals -entry 0x00000000 -ro-base 0x00000000 -rw-base 0x40000300

AREA   MyStacks, DATA, NOINIT, ALIGN=2  ;ALIGN=2 表示代码是04字节对齐的。

SvcStackSpace       %   SVC_STACK_LEGTH * 4  ;Stack spaces for Administration Mode 管理模式堆栈空间
IrqStackSpace       %   IRQ_STACK_LEGTH * 4  ;Stack spaces for Interrupt ReQuest Mode 中断模式堆栈空间
FiqStackSpace       %   FIQ_STACK_LEGTH * 4  ;Stack spaces for Fast Interrupt reQuest Mode 快速中断模式堆栈空间
AbtStackSpace       %   ABT_STACK_LEGTH * 4  ;Stack spaces for Suspend Mode 中止义模式堆栈空间
UndtStackSpace      %   UND_STACK_LEGTH * 4  ;Stack spaces for Undefined Mode 未定义模式堆栈

AREA   Variable, DATA

BufferTxd   SPACE  100  ;
BufferRxd   SPACE  100  ;
BufferCurTime  SPACE  16  ;
BufferI2CSlaveAddress   %       1  ;包含 bit=0/1 读写信息
BufferI2CNumber      %     1       ;
BufferI2CData      %     0x100   ;

AREA   Heap, DATA, NOINIT
bottom_of_heap  SPACE   1

    AREA   Stacks, DATA, NOINIT
StackUSR   SPACE 100

;;===========================================================================================
AREA MainProgram,CODE,READONLY
CODE32    ; CODE32: 以下为 ARM 指令；CODE16: 以下为 THUMB 指令
;;===========================================================================================


;; 从这里开始写你自己的程序