LPC2300.s
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上传日期:2022-06-12
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- ;/*****************************************************************************/
- ;/* LPC2300.S: Startup file for Philips LPC2300 device series */
- ;/*****************************************************************************/
- ;/* <<< Use Configuration Wizard in Context Menu >>> */
- ;/*****************************************************************************/
- ;/* This file is part of the uVision/ARM development tools. */
- ;/* Copyright (c) 2006 Keil - An ARM Company. 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 LPC2300.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 MEMMAP
- ; * which overwrites the settings of the CPU configuration pins. The
- ; * startup and interrupt vectors are remapped from:
- ; * 0x00000000 default setting (not remapped)
- ; * 0x40000000 when RAM_MODE is used
- ; *
- ; * RAM_MODE: when set the device is configured for code execution
- ; * from on-chip RAM starting at address 0x40000000.
- ; */
- ; 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
- Stack_Size EQU (UND_Stack_Size + SVC_Stack_Size + ABT_Stack_Size +
- FIQ_Stack_Size + IRQ_Stack_Size + USR_Stack_Size)
- AREA STACK, NOINIT, READWRITE, ALIGN=3
- Stack_Mem SPACE Stack_Size
- Stack_Top EQU Stack_Mem + Stack_Size
- ;// <h> Heap Configuration
- ;// <o> Heap Size (in Bytes) <0x0-0xFFFFFFFF>
- ;// </h>
- Heap_Size EQU 0x00000000
- AREA HEAP, NOINIT, READWRITE, ALIGN=3
- Heap_Mem SPACE Heap_Size
- ; System Control Block (SCB) Module Definitions
- SCB_BASE EQU 0xE01FC000 ; SCB Base Address
- PLLCON_OFS EQU 0x80 ; PLL Control Offset
- PLLCFG_OFS EQU 0x84 ; PLL Configuration Offset
- PLLSTAT_OFS EQU 0x88 ; PLL Status Offset
- PLLFEED_OFS EQU 0x8C ; PLL Feed Offset
- CCLKCFG_OFS EQU 0x104 ; CPU Clock Divider Reg Offset
- USBCLKCFG_OFS EQU 0x108 ; USB Clock Divider Reg Offset
- CLKSRCSEL_OFS EQU 0x10C ; Clock Source Sel Reg Offset
- SCS_OFS EQU 0x1A0 ; Sys Control and Status Reg Offset
- PCLKSEL0_OFS EQU 0x1A8 ; Periph Clock Sel Reg 0 Offset
- PCLKSEL1_OFS EQU 0x1AC ; Periph Clock Sel Reg 0 Offset
- ; Constants
- OSCRANGE EQU (1<<4) ; Oscillator Range Select
- OSCEN EQU (1<<5) ; Main oscillator Enable
- OSCSTAT EQU (1<<6) ; Main Oscillator Status
- PLLCON_PLLE EQU (1<<0) ; PLL Enable
- PLLCON_PLLC EQU (1<<1) ; PLL Connect
- PLLSTAT_M EQU (0x7FFF<<0) ; PLL M Value
- PLLSTAT_N EQU (0xFF<<16) ; PLL N Value
- PLLSTAT_PLOCK EQU (1<<26) ; PLL Lock Status
- ;// <e> Clock Setup
- ;// <h> System Controls and Status Register (SYS)
- ;// <o1.4> OSCRANGE: Main Oscillator Range Select
- ;// <0=> 1 MHz to 20 MHz
- ;// <1=> 15 MHz to 24 MHz
- ;// <e1.5> OSCEN: Main Oscillator Enable
- ;// </e>
- ;// </h>
- ;//
- ;// <h> PLL Clock Source Select Register (CLKSRCSEL)
- ;// <o2.0..1> CLKSRC: PLL Clock Source Selection
- ;// <0=> Internal RC oscillator
- ;// <1=> Main oscillator
- ;// <1=> RTC oscillator
- ;// </h>
- ;//
- ;// <h> PLL Configuration Register (PLLCFG)
- ;// <i> PLL_clk = (2* M * PLL_clk_src) / N
- ;// <o3.0..14> MSEL: PLL Multiplier Selection
- ;// <1-32768><#-1>
- ;// <i> M Value
- ;// <o3.16..23> NSEL: PLL Divider Selection
- ;// <1-256><#-1>
- ;// <i> N Value
- ;// </h>
- ;//
- ;// <h> CPU Clock Configuration Register (CCLKCFG)
- ;// <o4.0..7> CCLKSEL: Divide Value for CPU Clock from PLL
- ;// <1-256><#-1>
- ;// </h>
- ;//
- ;// <h> USB Clock Configuration Register (USBCLKCFG)
- ;// <o5.0..3> USBSEL: Divide Value for USB Clock from PLL
- ;// <1-16><#-1>
- ;// </h>
- ;//
- ;// <h> Peripheral Clock Selection Register 0 (PCLKSEL0)
- ;// <o6.0..1> PCLK_WDT: Peripheral Clock Selection for WDT
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o6.2..3> PCLK_TIMER0: Peripheral Clock Selection for TIMER0
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o6.4..5> PCLK_TIMER1: Peripheral Clock Selection for TIMER1
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o6.6..7> PCLK_UART0: Peripheral Clock Selection for UART0
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o6.8..9> PCLK_UART1: Peripheral Clock Selection for UART1
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o6.10..11> PCLK_PWM0: Peripheral Clock Selection for PWM0
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o6.12..13> PCLK_PWM1: Peripheral Clock Selection for PWM1
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o6.14..15> PCLK_I2C0: Peripheral Clock Selection for I2C0
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o6.16..17> PCLK_SPI: Peripheral Clock Selection for SPI
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o6.18..19> PCLK_RTC: Peripheral Clock Selection for RTC
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o6.20..21> PCLK_SSP1: Peripheral Clock Selection for SSP1
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o6.22..23> PCLK_DAC: Peripheral Clock Selection for DAC
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o6.24..25> PCLK_ADC: Peripheral Clock Selection for ADC
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o6.26..27> PCLK_CAN1: Peripheral Clock Selection for CAN1
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 6
- ;// <o6.28..29> PCLK_CAN2: Peripheral Clock Selection for CAN2
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 6
- ;// <o6.30..31> PCLK_ACF: Peripheral Clock Selection for ACF
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 6
- ;// </h>
- ;//
- ;// <h> Peripheral Clock Selection Register 1 (PCLKSEL1)
- ;// <o7.0..1> PCLK_BAT_RAM: Peripheral Clock Selection for the Battery Supported RAM
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o7.2..3> PCLK_GPIO: Peripheral Clock Selection for GPIOs
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o7.4..5> PCLK_PCB: Peripheral Clock Selection for Pin Connect Block
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o7.6..7> PCLK_I2C1: Peripheral Clock Selection for I2C1
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o7.10..11> PCLK_SSP0: Peripheral Clock Selection for SSP0
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o7.12..13> PCLK_TIMER2: Peripheral Clock Selection for TIMER2
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o7.14..15> PCLK_TIMER3: Peripheral Clock Selection for TIMER3
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o7.16..17> PCLK_UART2: Peripheral Clock Selection for UART2
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o7.18..19> PCLK_UART3: Peripheral Clock Selection for UART3
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o7.20..21> PCLK_I2C2: Peripheral Clock Selection for I2C2
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o7.22..23> PCLK_I2S: Peripheral Clock Selection for I2S
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o7.24..25> PCLK_MCI: Peripheral Clock Selection for MCI
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// <o7.28..29> PCLK_SYSCON: Peripheral Clock Selection for System Control Block
- ;// <0=> Pclk = Cclk / 4
- ;// <1=> Pclk = Cclk
- ;// <2=> Pclk = Cclk / 2
- ;// <3=> Pclk = Cclk / 8
- ;// </h>
- ;// </e>
- CLOCK_SETUP EQU 1
- SCS_Val EQU 0x00000020
- CLKSRCSEL_Val EQU 0x00000001
- PLLCFG_Val EQU 0x0000000B
- CCLKCFG_Val EQU 0x00000004
- USBCLKCFG_Val EQU 0x00000005
- PCLKSEL0_Val EQU 0x00000000
- PCLKSEL1_Val EQU 0x00000000
- ; Memory Accelerator Module (MAM) definitions
- MAM_BASE EQU 0xE01FC000 ; MAM Base Address
- MAMCR_OFS EQU 0x00 ; MAM Control Offset
- MAMTIM_OFS EQU 0x04 ; MAM Timing Offset
- ;// <e> MAM Setup
- ;// <o1.0..1> MAM Control
- ;// <0=> Disabled
- ;// <1=> Partially Enabled
- ;// <2=> Fully Enabled
- ;// <i> Mode
- ;// <o2.0..2> MAM Timing
- ;// <0=> Reserved <1=> 1 <2=> 2 <3=> 3
- ;// <4=> 4 <5=> 5 <6=> 6 <7=> 7
- ;// <i> Fetch Cycles
- ;// </e>
- MAM_SETUP EQU 1
- MAMCR_Val EQU 0x00000002
- MAMTIM_Val EQU 0x00000004
- ; 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, [PC, #-0x0120] ; Vector from VicVectAddr
- 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
- IRQ_Handler B IRQ_Handler
- FIQ_Handler B FIQ_Handler
- ; Reset Handler
- EXPORT Reset_Handler
- Reset_Handler
- ; Setup Clock
- IF CLOCK_SETUP != 0
- LDR R0, =SCB_BASE
- MOV R1, #0xAA
- MOV R2, #0x55
- ; Configure and Enable PLL
- LDR R3, =SCS_Val ; Enable main oscillator
- STR R3, [R0, #SCS_OFS]
- IF (SCS_Val:AND:OSCEN) != 0
- OSC_Loop LDR R3, [R0, #SCS_OFS] ; Wait for main osc stabilize
- ANDS R3, R3, #OSCSTAT
- BEQ OSC_Loop
- ENDIF
- LDR R3, =CLKSRCSEL_Val ; Select PLL source clock
- STR R3, [R0, #CLKSRCSEL_OFS]
- LDR R3, =PLLCFG_Val
- STR R3, [R0, #PLLCFG_OFS]
- STR R1, [R0, #PLLFEED_OFS]
- STR R2, [R0, #PLLFEED_OFS]
- MOV R3, #PLLCON_PLLE
- STR R3, [R0, #PLLCON_OFS]
- STR R1, [R0, #PLLFEED_OFS]
- STR R2, [R0, #PLLFEED_OFS]
- ; Wait until PLL Locked
- PLL_Loop LDR R3, [R0, #PLLSTAT_OFS]
- ANDS R3, R3, #PLLSTAT_PLOCK
- BEQ PLL_Loop
- M_N_Lock LDR R3, [R0, #PLLSTAT_OFS]
- LDR R4, =(PLLSTAT_M:OR:PLLSTAT_N)
- AND R3, R3, R4
- LDR R4, =PLLCFG_Val
- EORS R3, R3, R4
- BNE M_N_Lock
- ; Setup CPU clock divider
- MOV R3, #CCLKCFG_Val
- STR R3, [R0, #CCLKCFG_OFS]
- ; Setup USB clock divider
- LDR R3, =USBCLKCFG_Val
- STR R3, [R0, #USBCLKCFG_OFS]
- ; Setup Peripheral Clock
- LDR R3, =PCLKSEL0_Val
- STR R3, [R0, #PCLKSEL0_OFS]
- LDR R3, =PCLKSEL1_Val
- STR R3, [R0, #PCLKSEL1_OFS]
- ; Switch to PLL Clock
- MOV R3, #(PLLCON_PLLE:OR:PLLCON_PLLC)
- STR R3, [R0, #PLLCON_OFS]
- STR R1, [R0, #PLLFEED_OFS]
- STR R2, [R0, #PLLFEED_OFS]
- ENDIF ; CLOCK_SETUP
- ; Setup MAM
- IF MAM_SETUP != 0
- LDR R0, =MAM_BASE
- MOV R1, #MAMTIM_Val
- STR R1, [R0, #MAMTIM_OFS]
- MOV R1, #MAMCR_Val
- STR R1, [R0, #MAMCR_OFS]
- ENDIF ; MAM_SETUP
- ; Memory Mapping (when Interrupt Vectors are in RAM)
- MEMMAP EQU 0xE01FC040 ; Memory Mapping Control
- IF :DEF:REMAP
- LDR R0, =MEMMAP
- IF :DEF:RAM_MODE
- MOV R1, #2
- ELSE
- MOV R1, #1
- ENDIF
- STR R1, [R0]
- ENDIF
- ; Initialise Interrupt System
- ; ...
- ; 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
- MOV SP, R0
- SUB SL, SP, #USR_Stack_Size
- ; Enter the C code
- IMPORT __main
- LDR R0, =__main
- BX R0
- ; 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 + USR_Stack_Size)
- LDR R2, = (Heap_Mem + Heap_Size)
- LDR R3, = Stack_Mem
- BX LR
- END