|
|
1.启动代码lpc2xxx_cstartup.s（要进中断必须的）
2.在Flash中仿真，配置文件LPC2103_Flash.icf
3.选择交互模式
4.不要优化
5.产生hex文件
这么定义在Proteus仿真中不太会出现配置上的问题，贴下启动代码
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; Part one of the system initialization code,
;; contains low-level
;; initialization.
;;
;; Copyright 2006 IAR Systems. All rights reserved.
;;
;; $Revision: 21638 $
;;
MODULE ?cstartup
;; Forward declaration of sections.
SECTION IRQ_STACK:DATA:NOROOT(3)
SECTION ABT_STACK:DATA:NOROOT(3)
SECTION SVC_STACK:DATA:NOROOT(3)
SECTION UND_STACK:DATA:NOROOT(3)
SECTION FIQ_STACK:DATA:NOROOT(3)
SECTION CSTACK:DATA:NOROOT(3)
;
; The module in this file are included in the libraries, and maybe
; replaced by any user-defined modules that define the PUBLICsymbol
; __iar_program_start or a user defined start symbol.
;
; To override the cstartup defined in the library, simply addyour
; modified version to the workbench project.
SECTION .intvec:CODE:NOROOT(2)
PUBLIC __vector
PUBLIC __vector_0x14
PUBLIC __iar_program_start
EXTERN undef_handler, prefetch_handler, data_handler,
EXTERN irq_handler, fiq_handler
ARM
__vector:
;;
ldr pc,[pc,#+24] ;; Reset
ldr pc,[pc,#+24] ;; Undefined instructions
B . ;; Software interrupt (SWI/SVC)
ldr pc,[pc,#+24] ;; Prefetch abort
ldr pc,[pc,#+24] ;; Data abort
__vector_0x14
DC32 0 ;; RESERVED
ldr pc,[pc,#+24] ;; IRQ
ldr pc,[pc,#+24] ;; FIQ
DC32 __iar_program_start ;; Reset
DC32 undef_handler ;; Undefined instructions
DC32 0 ;; Software interrupt (SWI/SVC)
DC32 prefetch_handler ;; Prefetch abort
DC32 data_handler ;; Data abort
DC32 0 ;; RESERVED
DC32 irq_handler ;; IRQ
DC32 fiq_handler ;; FIQ
; --------------------------------------------------
; ?cstartup -- low-level system initialization code.
;
; After a reser execution starts here, the mode is ARM,supervisor
; with interrupts disabled.
;
SECTION .text:CODE:NOROOT(2)
; PUBLIC ?cstartup
EXTERN ?main
REQUIRE __vector
ARM
__iar_program_start:
?cstartup:
;
; Add initialization needed before setup of stackpointershere.
;
; Errata MAM.1Incorrect read of data from SRAMafter Reset and MAM
; is not enabled or partially enabled.
; Work-around: User code should enable the MAM after Reset andbefore
; any RAM accesses
MAMCR DEFINE 0xE01FC000 ; MAM Control Register
MAMTIM DEFINE 0xE01FC004 ; MAM Timing register
ldr r0,=MAMCR
ldr r1,=MAMTIM
ldr r2,=0
str r2,[r0]
ldr r2,=3 ; 1 < 20 MHz; 20 MHz < 2< 40 MHz; 40MHz > 3
str r2,[r1]
ldr r2,=2
str r2,[r0]
; Initialize the stack pointers.
; The pattern below can be used for any of the exceptionstacks:
; FIQ, IRQ, SVC, ABT, UND, SYS.
; The USR mode uses the same stack as SYS.
; The stack segments must be defined in the linker commandfile,
; and be declared above.
;
; --------------------
; Mode, correspords to bits 0-5 in CPSR
MODE_BITS DEFINE 0x1F ; Bitmask for mode bits in CPSR
USR_MODE DEFINE 0x10 ; Usermode
FIQ_MODE DEFINE 0x11 ; FastInterrupt Request mode
IRQ_MODE DEFINE 0x12 ;Interrupt Request mode
SVC_MODE DEFINE 0x13 ;Supervisor mode
ABT_MODE DEFINE 0x17 ; Abortmode
UND_MODE DEFINE 0x1B ;Undefined Instruction mode
SYS_MODE DEFINE 0x1F ; Systemmode
MRS r0,cpsr ; Original PSR value
BIC r0, r0,#MODE_BITS ; Clear the mode bits
ORR r0, r0,#ABT_MODE ; Set ABT mode bits
MSR cpsr_c,r0 ; Change the mode
LDR sp,=SFE(ABT_STACK) ; End of ABT_STACK
BIC r0, r0,#MODE_BITS ; Clear the mode bits
ORR r0, r0,#SVC_MODE ; Set SVC mode bits
MSR cpsr_c,r0 ; Change the mode
LDR sp,=SFE(SVC_STACK) ; End of SVC_STACK
BIC r0, r0,#MODE_BITS ; Clear the mode bits
ORR r0, r0,#UND_MODE ; Set UND mode bits
MSR cpsr_c,r0 ; Change the mode
LDR sp,=SFE(UND_STACK) ; End of UND_STACK
BIC r0, r0,#MODE_BITS ; Clear the mode bits
ORR r0, r0,#FIQ_MODE ; Set FIQ mode bits
MSR cpsr_c,r0 ; Change the mode
LDR sp,=SFE(FIQ_STACK) ; End of FIQ_STACK
BIC r0, r0,#MODE_BITS ; Clear the mode bits
ORR r0, r0,#IRQ_MODE ; Set IRQ mode bits
MSR cpsr_c,r0 ; Change the mode
LDR sp,=SFE(IRQ_STACK) ; End of IRQ_STACK
BIC r0 ,r0,#MODE_BITS ; Clear the mode bits
ORR r0 ,r0,#SYS_MODE ; Set System mode bits
MSR cpsr_c,r0 ; Change the mode
LDR sp,=SFE(CSTACK) ; End of CSTACK
#ifdef __ARMVFP__
;; Enable the VFP coprocessor.
MOV r0,#0x40000000 ; Set EN bit in VFP
FMXR fpexc,r0 ; FPEXC, clear others.
;
; Disable underflow exceptions by setting flush to zero mode.
; For full IEEE 754 underflow compliance this code should beremoved
; and the appropriate exception handler installed.
;
MOV r0,#0x01000000 ; Set FZ bit in VFP
FMXR fpscr,r0 ; FPSCR, clear others.
#endif
;
; Add more initialization here
;
; Continue to ?main for C-level initialization.
LDR r0, =?main
BX r0
END
|
|
QQ好友和群
QQ空间
腾讯微博
腾讯朋友
收藏
淘帖
顶
踩
