str71x.s

STR71x开发板上做LED驱动的代码

;/*****************************************************************************/
;/* STARTUP.S: Startup file for ST STR71x device series                       */
;/*****************************************************************************/
;/* <<< Use Configuration Wizard in Context Menu >>>                          */ 
;/*****************************************************************************/
;/* This file is part of the uVision/ARM development tools.                   */
;/* Copyright (c) 2005-2006 Keil Software. All rights reserved.               */
;/* This software may only be used under the terms of a valid, current,       */
;/* end user licence from KEIL for a compatible version of KEIL software      */
;/* development tools. Nothing else gives you the right to use this software. */
;/*****************************************************************************/


;/*
; *  The STARTUP.S code is executed after CPU Reset. This file may be 
; *  translated with the following SET symbols. In uVision these SET 
; *  symbols are entered under Options - ASM - Define.
; *
; *  REMAP: when set the startup code initializes the register BOOTCR 
; *  which overwrites the settings of the CPU configuration pins. The 
; *  startup and interrupt vectors are remapped from:
; *     0x40000000  default setting
; *     0x60000000  when EXTMEM_MODE is used
; *     0x20000000  when RAM_MODE is used
; *
; *  EXTMEM_MODE: when set the device is configured for code execution
; *  from external memory starting at address 0x60000000. The startup
; *  vectors are located to 0x60000000.
; *
; *  RAM_MODE: when set the device is configured for code execution
; *  from on-chip RAM starting at address 0x20000000. The startup
; *  vectors are located to 0x20000000.
; */


; Standard definitions of Mode bits and Interrupt (I & F) flags in PSRs

Mode_USR        EQU     0x10
Mode_FIQ        EQU     0x11
Mode_IRQ        EQU     0x12
Mode_SVC        EQU     0x13
Mode_ABT        EQU     0x17
Mode_UND        EQU     0x1B
Mode_SYS        EQU     0x1F

I_Bit           EQU     0x80            ; when I bit is set, IRQ is disabled
F_Bit           EQU     0x40            ; when F bit is set, FIQ is disabled


;// <h> Stack Configuration (Stack Sizes in Bytes)
;//   <o0> Undefined Mode      <0x0-0xFFFFFFFF:8>
;//   <o1> Supervisor Mode     <0x0-0xFFFFFFFF:8>
;//   <o2> Abort Mode          <0x0-0xFFFFFFFF:8>
;//   <o3> Fast Interrupt Mode <0x0-0xFFFFFFFF:8>
;//   <o4> Interrupt Mode      <0x0-0xFFFFFFFF:8>
;//   <o5> User/System Mode    <0x0-0xFFFFFFFF:8>
;// </h>

UND_Stack_Size  EQU     0x00000000
SVC_Stack_Size  EQU     0x00000008
ABT_Stack_Size  EQU     0x00000000
FIQ_Stack_Size  EQU     0x00000000
IRQ_Stack_Size  EQU     0x00000100
USR_Stack_Size  EQU     0x00000400

ISR_Stack_Size  EQU     (UND_Stack_Size + SVC_Stack_Size + ABT_Stack_Size + \
                         FIQ_Stack_Size + IRQ_Stack_Size)

                AREA    STACK, NOINIT, READWRITE, ALIGN=3

Stack_Mem       SPACE   USR_Stack_Size
__initial_sp    SPACE   ISR_Stack_Size
Stack_Top


;// <h> Heap Configuration
;//   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF>
;// </h>

Heap_Size       EQU     0x00000000

                AREA    HEAP, NOINIT, READWRITE, ALIGN=3
__heap_base
Heap_Mem        SPACE   Heap_Size
__heap_limit


; APB Bridge 1 & 2 definitions (Peripherals)
APB1_BASE       EQU     0xC0000000      ; APB Bridge 1 Base Address
APB2_BASE       EQU     0xE0000000      ; APB Bridge 2 Base Address
CKDIS_OFS       EQU     0x10            ; Clock Disable Register Offset
SWRES_OFS       EQU     0x14            ; Software Reset Register Offset
APB1_Mask       EQU     0x27FB          ; APB1 Peripherals Mask
APB2_Mask       EQU     0x7FDD          ; APB2 Peripherals Mask

;// <e> Reset all Device Peripherals
PERIPH_RESET    EQU     0
;// </e>


; External Memory Interface (EMI) definitions
EMI_BASE        EQU     0x6C000000      ; EMI Base Address
BCON0_OFS       EQU     0x00            ; BCON0 Offset
BCON1_OFS       EQU     0x04            ; BCON1 Offset
BCON2_OFS       EQU     0x08            ; BCON2 Offset
BCON3_OFS       EQU     0x0C            ; BCON3 Offset

;// <e> External Memory Interface (EMI)
EMI_SETUP       EQU     0

;//   <h> Bank Configuration 0 (BCON0)
;//     <o.15>    BE: Bank Enable
;//     <o.0..1>  B_SIZE: Bus Size  <0=>  8-bit    <1=> 16-bit
;//                                 <2=> Reserved  <3=> Reserved
;//     <o.2..5>  C_LENGTH: Cycle Length <0-15>
;//               <i> Number of Wait States
;//   </h>
BCON0_Val       EQU     0x0000801D

;//   <h> Bank Configuration 1 (BCON1)
;//     <o.15>    BE: Bank Enable
;//     <o.0..1>  B_SIZE: Bus Size  <0=>  8-bit    <1=> 16-bit
;//                                 <2=> Reserved  <3=> Reserved
;//     <o.2..5>  C_LENGTH: Cycle Length <0-15>
;//               <i> Number of Wait States
;//   </h>
BCON1_Val       EQU     0x0000801D

;//   <h> Bank Configuration 2 (BCON2)
;//     <o.15>    BE: Bank Enable
;//     <o.0..1>  B_SIZE: Bus Size  <0=>  8-bit    <1=> 16-bit
;//                                 <2=> Reserved  <3=> Reserved
;//     <o.2..5>  C_LENGTH: Cycle Length <0-15>
;//               <i> Number of Wait States
;//   </h>
BCON2_Val       EQU     0x0000001D

;//   <h> Bank Configuration 3 (BCON3)
;//     <o.15>    BE: Bank Enable
;//     <o.0..1>  B_SIZE: Bus Size  <0=>  8-bit    <1=> 16-bit
;//                                 <2=> Reserved  <3=> Reserved
;//     <o.2..5>  C_LENGTH: Cycle Length <0-15>
;//               <i> Number of Wait States
;//   </h>
BCON3_Val       EQU     0x0000001D

;// </e> End of EMI


; GPIO Port 2 definitions (for External Memory Interface setup)
GPIO2_BASE      EQU     0xE0005000      ; GPIO2 Base Address
PC0_OFS         EQU     0x00            ; PC0 Offset
PC1_OFS         EQU     0x04            ; PC1 Offset
PC2_OFS         EQU     0x08            ; PC2 Offset
PD_OFS          EQU     0x0C            ; PD Offset


; Enhanced Interrupt Controller (EIC) definitions
EIC_BASE        EQU     0xFFFFF800      ; EIC Base Address
ICR_OFS         EQU     0x00            ; Interrupt Control Reg. Offset
CIPR_OFS        EQU     0x08            ; Curr. Int. Priority R. Offset
IVR_OFS         EQU     0x18            ; Interrupt Vector Reg. Offset
FIR_OFS         EQU     0x1C            ; Fast Interrupt Reg. Offset
IER_OFS         EQU     0x20            ; Interrupt Enable Reg. Offset
IPR_OFS         EQU     0x40            ; Interrupt Pending Reg. Offset
SIR0_OFS        EQU     0x60            ; Source Interrupt Reg. 0 Offset

;// <e> Setup EIC and Exception Handlers
EIC_SETUP       EQU     1
;// </e>


                PRESERVE8
                

; Area Definition and Entry Point
;  Startup Code must be linked first at Address at which it expects to run.

                EXPORT  Vectors
                AREA    Reset, CODE, READONLY
                ARM

                IF      EIC_SETUP <> 0

                ; Import Exceptions Handlers
                IMPORT  UndefHandler
                IMPORT  SWIHandler
                IMPORT  PAbtHandler
                IMPORT  DAbtHandler
                IMPORT  IRQHandler
                IMPORT  FIQHandler

                ; Import IRQ Handlers
                IMPORT  T0TIMIIRQHandler
                IMPORT  FLASHIRQHandler
                IMPORT  RCCUIRQHandler
                IMPORT  RTCIRQHandler
                IMPORT  WDGIRQHandler
                IMPORT  XTIIRQHandler
                IMPORT  USBHPIRQHandler
                IMPORT  I2C0ITERRIRQHandler
                IMPORT  I2C1ITERRIRQHandler
                IMPORT  UART0IRQHandler
                IMPORT  UART1IRQHandler
                IMPORT  UART2IRQHandler
                IMPORT  UART3IRQHandler
                IMPORT  BSPI0IRQHandler
                IMPORT  BSPI1IRQHandler
                IMPORT  I2C0IRQHandler
                IMPORT  I2C1IRQHandler
                IMPORT  CANIRQHandler
                IMPORT  ADC12IRQHandler
                IMPORT  T1TIMIIRQHandler
                IMPORT  T2TIMIIRQHandler
                IMPORT  T3TIMIIRQHandler
                IMPORT  HDLCIRQHandler
                IMPORT  USBLPIRQHandler
                IMPORT  T0TOIIRQHandler
                IMPORT  T0OC1IRQHandler
                IMPORT  T0OC2IRQHandler

                ENDIF

; Exception Vectors
;  Mapped to Address 0.
;  Absolute addressing mode must be used.
;  Dummy Handlers are implemented as infinite loops which can be modified.

Vectors         LDR     PC, Reset_Addr         
                LDR     PC, Undef_Addr
                LDR     PC, SWI_Addr
                LDR     PC, PAbt_Addr
                LDR     PC, DAbt_Addr
                NOP                         ; Reserved Vector 
                IF      EIC_SETUP <> 0                
                LDR     PC,IRQ_Addr
                ELSE
                LDR     PC,[PC, #-0x0808]   ; Vector from EIC_IVR
                ENDIF
                LDR     PC, FIQ_Addr