500 lines
17 KiB
ArmAsm
500 lines
17 KiB
ArmAsm
;/*****************************************************************************/
|
|
;/* SAM7.S: Startup file for Atmel AT91SAM7 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 SAM7.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 remaps exception vectors from
|
|
; * on-chip RAM to address 0.
|
|
; *
|
|
; * RAM_INTVEC: when set the startup code copies exception vectors
|
|
; * from on-chip Flash to on-chip RAM.
|
|
; */
|
|
|
|
|
|
; 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
|
|
|
|
|
|
; Internal Memory Base Addresses
|
|
FLASH_BASE EQU 0x00100000
|
|
RAM_BASE EQU 0x00200000
|
|
|
|
|
|
;// <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 0x00000100
|
|
ABT_Stack_Size EQU 0x00000000
|
|
FIQ_Stack_Size EQU 0x00000000
|
|
IRQ_Stack_Size EQU 0x00000100
|
|
USR_Stack_Size EQU 0x00000100
|
|
|
|
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
|
|
|
|
|
|
; Reset Controller (RSTC) definitions
|
|
RSTC_BASE EQU 0xFFFFFD00 ; RSTC Base Address
|
|
RSTC_MR EQU 0x08 ; RSTC_MR Offset
|
|
|
|
;/*
|
|
;// <e> Reset Controller (RSTC)
|
|
;// <o1.0> URSTEN: User Reset Enable
|
|
;// <i> Enables NRST Pin to generate Reset
|
|
;// <o1.8..11> ERSTL: External Reset Length <0-15>
|
|
;// <i> External Reset Time in 2^(ERSTL+1) Slow Clock Cycles
|
|
;// </e>
|
|
;*/
|
|
RSTC_SETUP EQU 1
|
|
RSTC_MR_Val EQU 0xA5000401
|
|
|
|
|
|
; Embedded Flash Controller (EFC) definitions
|
|
EFC_BASE EQU 0xFFFFFF00 ; EFC Base Address
|
|
EFC0_FMR EQU 0x60 ; EFC0_FMR Offset
|
|
EFC1_FMR EQU 0x70 ; EFC1_FMR Offset
|
|
|
|
;// <e> Embedded Flash Controller 0 (EFC0)
|
|
;// <o1.16..23> FMCN: Flash Microsecond Cycle Number <0-255>
|
|
;// <i> Number of Master Clock Cycles in 1us
|
|
;// <o1.8..9> FWS: Flash Wait State
|
|
;// <0=> Read: 1 cycle / Write: 2 cycles
|
|
;// <1=> Read: 2 cycle / Write: 3 cycles
|
|
;// <2=> Read: 3 cycle / Write: 4 cycles
|
|
;// <3=> Read: 4 cycle / Write: 4 cycles
|
|
;// </e>
|
|
EFC0_SETUP EQU 1
|
|
EFC0_FMR_Val EQU 0x00320100
|
|
|
|
;// <e> Embedded Flash Controller 1 (EFC1)
|
|
;// <o1.16..23> FMCN: Flash Microsecond Cycle Number <0-255>
|
|
;// <i> Number of Master Clock Cycles in 1us
|
|
;// <o1.8..9> FWS: Flash Wait State
|
|
;// <0=> Read: 1 cycle / Write: 2 cycles
|
|
;// <1=> Read: 2 cycle / Write: 3 cycles
|
|
;// <2=> Read: 3 cycle / Write: 4 cycles
|
|
;// <3=> Read: 4 cycle / Write: 4 cycles
|
|
;// </e>
|
|
EFC1_SETUP EQU 0
|
|
EFC1_FMR_Val EQU 0x00320100
|
|
|
|
|
|
; Watchdog Timer (WDT) definitions
|
|
WDT_BASE EQU 0xFFFFFD40 ; WDT Base Address
|
|
WDT_MR EQU 0x04 ; WDT_MR Offset
|
|
|
|
;// <e> Watchdog Timer (WDT)
|
|
;// <o1.0..11> WDV: Watchdog Counter Value <0-4095>
|
|
;// <o1.16..27> WDD: Watchdog Delta Value <0-4095>
|
|
;// <o1.12> WDFIEN: Watchdog Fault Interrupt Enable
|
|
;// <o1.13> WDRSTEN: Watchdog Reset Enable
|
|
;// <o1.14> WDRPROC: Watchdog Reset Processor
|
|
;// <o1.28> WDDBGHLT: Watchdog Debug Halt
|
|
;// <o1.29> WDIDLEHLT: Watchdog Idle Halt
|
|
;// <o1.15> WDDIS: Watchdog Disable
|
|
;// </e>
|
|
WDT_SETUP EQU 1
|
|
WDT_MR_Val EQU 0x00008000
|
|
|
|
|
|
; Power Mangement Controller (PMC) definitions
|
|
PMC_BASE EQU 0xFFFFFC00 ; PMC Base Address
|
|
PMC_MOR EQU 0x20 ; PMC_MOR Offset
|
|
PMC_MCFR EQU 0x24 ; PMC_MCFR Offset
|
|
PMC_PLLR EQU 0x2C ; PMC_PLLR Offset
|
|
PMC_MCKR EQU 0x30 ; PMC_MCKR Offset
|
|
PMC_SR EQU 0x68 ; PMC_SR Offset
|
|
PMC_MOSCEN EQU (1<<0) ; Main Oscillator Enable
|
|
PMC_OSCBYPASS EQU (1<<1) ; Main Oscillator Bypass
|
|
PMC_OSCOUNT EQU (0xFF<<8) ; Main OScillator Start-up Time
|
|
PMC_DIV EQU (0xFF<<0) ; PLL Divider
|
|
PMC_PLLCOUNT EQU (0x3F<<8) ; PLL Lock Counter
|
|
PMC_OUT EQU (0x03<<14) ; PLL Clock Frequency Range
|
|
PMC_MUL EQU (0x7FF<<16) ; PLL Multiplier
|
|
PMC_USBDIV EQU (0x03<<28) ; USB Clock Divider
|
|
PMC_CSS EQU (3<<0) ; Clock Source Selection
|
|
PMC_PRES EQU (7<<2) ; Prescaler Selection
|
|
PMC_MOSCS EQU (1<<0) ; Main Oscillator Stable
|
|
PMC_LOCK EQU (1<<2) ; PLL Lock Status
|
|
PMC_MCKRDY EQU (1<<3) ; Master Clock Status
|
|
|
|
;// <e> Power Mangement Controller (PMC)
|
|
;// <h> Main Oscillator
|
|
;// <o1.0> MOSCEN: Main Oscillator Enable
|
|
;// <o1.1> OSCBYPASS: Oscillator Bypass
|
|
;// <o1.8..15> OSCCOUNT: Main Oscillator Startup Time <0-255>
|
|
;// </h>
|
|
;// <h> Phase Locked Loop (PLL)
|
|
;// <o2.0..7> DIV: PLL Divider <0-255>
|
|
;// <o2.16..26> MUL: PLL Multiplier <0-2047>
|
|
;// <i> PLL Output is multiplied by MUL+1
|
|
;// <o2.14..15> OUT: PLL Clock Frequency Range
|
|
;// <0=> 80..160MHz <1=> Reserved
|
|
;// <2=> 150..220MHz <3=> Reserved
|
|
;// <o2.8..13> PLLCOUNT: PLL Lock Counter <0-63>
|
|
;// <o2.28..29> USBDIV: USB Clock Divider
|
|
;// <0=> None <1=> 2 <2=> 4 <3=> Reserved
|
|
;// </h>
|
|
;// <o3.0..1> CSS: Clock Source Selection
|
|
;// <0=> Slow Clock
|
|
;// <1=> Main Clock
|
|
;// <2=> Reserved
|
|
;// <3=> PLL Clock
|
|
;// <o3.2..4> PRES: Prescaler
|
|
;// <0=> None
|
|
;// <1=> Clock / 2 <2=> Clock / 4
|
|
;// <3=> Clock / 8 <4=> Clock / 16
|
|
;// <5=> Clock / 32 <6=> Clock / 64
|
|
;// <7=> Reserved
|
|
;// </e>
|
|
PMC_SETUP EQU 1
|
|
PMC_MOR_Val EQU 0x00000601
|
|
PMC_PLLR_Val EQU 0x00191C05
|
|
PMC_MCKR_Val EQU 0x00000007
|
|
|
|
|
|
PRESERVE8
|
|
|
|
|
|
; Area Definition and Entry Point
|
|
; Startup Code must be linked first at Address at which it expects to run.
|
|
|
|
AREA RESET, CODE, READONLY
|
|
ARM
|
|
|
|
|
|
; 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
|
|
LDR PC,IRQ_Addr
|
|
LDR PC,FIQ_Addr
|
|
|
|
Reset_Addr DCD Reset_Handler
|
|
Undef_Addr DCD Undef_Handler
|
|
SWI_Addr DCD SWI_Handler
|
|
PAbt_Addr DCD PAbt_Handler
|
|
DAbt_Addr DCD DAbt_Handler
|
|
DCD 0 ; Reserved Address
|
|
IRQ_Addr DCD IRQ_Handler
|
|
FIQ_Addr DCD FIQ_Handler
|
|
|
|
Undef_Handler B Undef_Handler
|
|
SWI_Handler B SWI_Handler
|
|
PAbt_Handler B PAbt_Handler
|
|
DAbt_Handler B DAbt_Handler
|
|
FIQ_Handler B FIQ_Handler
|
|
|
|
|
|
; Reset Handler
|
|
|
|
EXPORT Reset_Handler
|
|
Reset_Handler
|
|
|
|
|
|
; Setup RSTC
|
|
IF RSTC_SETUP != 0
|
|
LDR R0, =RSTC_BASE
|
|
LDR R1, =RSTC_MR_Val
|
|
STR R1, [R0, #RSTC_MR]
|
|
ENDIF
|
|
|
|
|
|
; Setup EFC0
|
|
IF EFC0_SETUP != 0
|
|
LDR R0, =EFC_BASE
|
|
LDR R1, =EFC0_FMR_Val
|
|
STR R1, [R0, #EFC0_FMR]
|
|
ENDIF
|
|
|
|
; Setup EFC1
|
|
IF EFC1_SETUP != 0
|
|
LDR R0, =EFC_BASE
|
|
LDR R1, =EFC1_FMR_Val
|
|
STR R1, [R0, #EFC1_FMR]
|
|
ENDIF
|
|
|
|
; Setup WDT
|
|
IF WDT_SETUP != 0
|
|
LDR R0, =WDT_BASE
|
|
LDR R1, =WDT_MR_Val
|
|
STR R1, [R0, #WDT_MR]
|
|
ENDIF
|
|
|
|
|
|
; Setup PMC
|
|
IF PMC_SETUP != 0
|
|
LDR R0, =PMC_BASE
|
|
|
|
; Setup Main Oscillator
|
|
LDR R1, =PMC_MOR_Val
|
|
STR R1, [R0, #PMC_MOR]
|
|
|
|
; Wait until Main Oscillator is stablilized
|
|
IF (PMC_MOR_Val:AND:PMC_MOSCEN) != 0
|
|
MOSCS_Loop LDR R2, [R0, #PMC_SR]
|
|
ANDS R2, R2, #PMC_MOSCS
|
|
BEQ MOSCS_Loop
|
|
ENDIF
|
|
|
|
; Setup the PLL
|
|
IF (PMC_PLLR_Val:AND:PMC_MUL) != 0
|
|
LDR R1, =PMC_PLLR_Val
|
|
STR R1, [R0, #PMC_PLLR]
|
|
|
|
; Wait until PLL is stabilized
|
|
PLL_Loop LDR R2, [R0, #PMC_SR]
|
|
ANDS R2, R2, #PMC_LOCK
|
|
BEQ PLL_Loop
|
|
ENDIF
|
|
|
|
; Select Clock
|
|
IF (PMC_MCKR_Val:AND:PMC_CSS) == 1 ; Main Clock Selected
|
|
LDR R1, =PMC_MCKR_Val
|
|
AND R1, #PMC_CSS
|
|
STR R1, [R0, #PMC_MCKR]
|
|
WAIT_Rdy1 LDR R2, [R0, #PMC_SR]
|
|
ANDS R2, R2, #PMC_MCKRDY
|
|
BEQ WAIT_Rdy1
|
|
LDR R1, =PMC_MCKR_Val
|
|
STR R1, [R0, #PMC_MCKR]
|
|
WAIT_Rdy2 LDR R2, [R0, #PMC_SR]
|
|
ANDS R2, R2, #PMC_MCKRDY
|
|
BEQ WAIT_Rdy2
|
|
ELIF (PMC_MCKR_Val:AND:PMC_CSS) == 3 ; PLL Clock Selected
|
|
LDR R1, =PMC_MCKR_Val
|
|
AND R1, #PMC_PRES
|
|
STR R1, [R0, #PMC_MCKR]
|
|
WAIT_Rdy1 LDR R2, [R0, #PMC_SR]
|
|
ANDS R2, R2, #PMC_MCKRDY
|
|
BEQ WAIT_Rdy1
|
|
LDR R1, =PMC_MCKR_Val
|
|
STR R1, [R0, #PMC_MCKR]
|
|
WAIT_Rdy2 LDR R2, [R0, #PMC_SR]
|
|
ANDS R2, R2, #PMC_MCKRDY
|
|
BEQ WAIT_Rdy2
|
|
ENDIF ; Select Clock
|
|
ENDIF ; PMC_SETUP
|
|
|
|
|
|
; Copy Exception Vectors to Internal RAM
|
|
|
|
IF :DEF:RAM_INTVEC
|
|
ADR R8, Vectors ; Source
|
|
LDR R9, =RAM_BASE ; Destination
|
|
LDMIA R8!, {R0-R7} ; Load Vectors
|
|
STMIA R9!, {R0-R7} ; Store Vectors
|
|
LDMIA R8!, {R0-R7} ; Load Handler Addresses
|
|
STMIA R9!, {R0-R7} ; Store Handler Addresses
|
|
ENDIF
|
|
|
|
|
|
; Remap on-chip RAM to address 0
|
|
|
|
MC_BASE EQU 0xFFFFFF00 ; MC Base Address
|
|
MC_RCR EQU 0x00 ; MC_RCR Offset
|
|
|
|
IF :DEF:REMAP
|
|
LDR R0, =MC_BASE
|
|
MOV R1, #1
|
|
STR R1, [R0, #MC_RCR] ; Remap
|
|
ENDIF
|
|
|
|
|
|
; Setup Stack for each mode
|
|
|
|
LDR R0, =Stack_Top
|
|
|
|
; Enter Undefined Instruction Mode and set its Stack Pointer
|
|
MSR CPSR_c, #Mode_UND:OR:I_Bit:OR:F_Bit
|
|
MOV SP, R0
|
|
SUB R0, R0, #UND_Stack_Size
|
|
|
|
; Enter Abort Mode and set its Stack Pointer
|
|
MSR CPSR_c, #Mode_ABT:OR:I_Bit:OR:F_Bit
|
|
MOV SP, R0
|
|
SUB R0, R0, #ABT_Stack_Size
|
|
|
|
; Enter FIQ Mode and set its Stack Pointer
|
|
MSR CPSR_c, #Mode_FIQ:OR:I_Bit:OR:F_Bit
|
|
MOV SP, R0
|
|
SUB R0, R0, #FIQ_Stack_Size
|
|
|
|
; Enter IRQ Mode and set its Stack Pointer
|
|
MSR CPSR_c, #Mode_IRQ:OR:I_Bit:OR:F_Bit
|
|
MOV SP, R0
|
|
SUB R0, R0, #IRQ_Stack_Size
|
|
|
|
; Enter Supervisor Mode and set its Stack Pointer
|
|
MSR CPSR_c, #Mode_SVC:OR:I_Bit:OR:F_Bit
|
|
MOV SP, R0
|
|
SUB R0, R0, #SVC_Stack_Size
|
|
|
|
; Enter User Mode and set its Stack Pointer
|
|
; MSR CPSR_c, #Mode_USR
|
|
IF :DEF:__MICROLIB
|
|
|
|
EXPORT __initial_sp
|
|
|
|
ELSE
|
|
|
|
; No usr mode stack here.
|
|
;MOV SP, R0
|
|
;SUB SL, SP, #USR_Stack_Size
|
|
|
|
ENDIF
|
|
|
|
|
|
; Enter the C code
|
|
|
|
IMPORT __main
|
|
LDR R0, =__main
|
|
BX R0
|
|
|
|
IMPORT rt_interrupt_enter
|
|
IMPORT rt_interrupt_leave
|
|
IMPORT rt_thread_switch_interrupt_flag
|
|
IMPORT rt_interrupt_from_thread
|
|
IMPORT rt_interrupt_to_thread
|
|
IMPORT rt_hw_trap_irq
|
|
|
|
IRQ_Handler PROC
|
|
EXPORT IRQ_Handler
|
|
STMFD sp!, {r0-r12,lr}
|
|
BL rt_interrupt_enter
|
|
BL rt_hw_trap_irq
|
|
BL rt_interrupt_leave
|
|
|
|
; if rt_thread_switch_interrupt_flag set, jump to
|
|
; rt_hw_context_switch_interrupt_do and don't return
|
|
LDR r0, =rt_thread_switch_interrupt_flag
|
|
LDR r1, [r0]
|
|
CMP r1, #1
|
|
BEQ rt_hw_context_switch_interrupt_do
|
|
|
|
LDMFD sp!, {r0-r12,lr}
|
|
SUBS pc, lr, #4
|
|
ENDP
|
|
|
|
; /*
|
|
; * void rt_hw_context_switch_interrupt_do(rt_base_t flag)
|
|
; */
|
|
rt_hw_context_switch_interrupt_do PROC
|
|
EXPORT rt_hw_context_switch_interrupt_do
|
|
MOV r1, #0 ; clear flag
|
|
STR r1, [r0]
|
|
|
|
LDMFD sp!, {r0-r12,lr}; reload saved registers
|
|
STMFD sp!, {r0-r3} ; save r0-r3
|
|
MOV r1, sp
|
|
ADD sp, sp, #16 ; restore sp
|
|
SUB r2, lr, #4 ; save old task's pc to r2
|
|
|
|
MRS r3, spsr ; get cpsr of interrupt thread
|
|
|
|
; switch to SVC mode and no interrupt
|
|
MSR cpsr_c, #I_Bit|F_Bit|Mode_SVC
|
|
|
|
STMFD sp!, {r2} ; push old task's pc
|
|
STMFD sp!, {r4-r12,lr}; push old task's lr,r12-r4
|
|
MOV r4, r1 ; Special optimised code below
|
|
MOV r5, r3
|
|
LDMFD r4!, {r0-r3}
|
|
STMFD sp!, {r0-r3} ; push old task's r3-r0
|
|
STMFD sp!, {r5} ; push old task's cpsr
|
|
MRS r4, spsr
|
|
STMFD sp!, {r4} ; push old task's spsr
|
|
|
|
LDR r4, =rt_interrupt_from_thread
|
|
LDR r5, [r4]
|
|
STR sp, [r5] ; store sp in preempted tasks's TCB
|
|
|
|
LDR r6, =rt_interrupt_to_thread
|
|
LDR r6, [r6]
|
|
LDR sp, [r6] ; get new task's stack pointer
|
|
|
|
LDMFD sp!, {r4} ; pop new task's spsr
|
|
MSR spsr_cxsf, r4
|
|
LDMFD sp!, {r4} ; pop new task's psr
|
|
MSR cpsr_cxsf, r4
|
|
|
|
LDMFD sp!, {r0-r12,lr,pc} ; pop new task's r0-r12,lr & pc
|
|
ENDP
|
|
|
|
IF :DEF:__MICROLIB
|
|
|
|
EXPORT __heap_base
|
|
EXPORT __heap_limit
|
|
|
|
ELSE
|
|
; User Initial Stack & Heap
|
|
AREA |.text|, CODE, READONLY
|
|
|
|
IMPORT __use_two_region_memory
|
|
EXPORT __user_initial_stackheap
|
|
__user_initial_stackheap
|
|
|
|
LDR R0, = Heap_Mem
|
|
LDR R1, = (Stack_Mem + IRQ_Stack_Size)
|
|
LDR R2, = (Heap_Mem + Heap_Size)
|
|
LDR R3, = Stack_Mem
|
|
BX LR
|
|
ENDIF
|
|
|
|
END
|