s3c44b0x.s

一个基于S3C44B0芯片的示例代码,实现利用定时器中断点亮LED指示灯,UART通信功能

;/*****************************************************************************/
;/* S3C44B0X.S: Startup file for Samsung S3C44B0X                             */
;/*****************************************************************************/
;/* <<< 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. */
;/*****************************************************************************/


; *** Startup Code (executed after Reset) ***

    INCLUDE option.inc
    INCLUDE memcfg.inc

;****************************************************************************
;存储器空间
;GCS6 64M 16bit(8MB) DRAM/SDRAM(0xc000000-0xc7fffff)
;APP    RAM=0xc000000~0xc7effff 
;44BMON RAM=0xc7f0000-0xc7fffff
;STACK	   =0xc7ffa00		   

;****************************************************************************
;看门狗定时器预定义
;WTCON	    EQU	0x01d30000

;****************************************************************************
;系统时钟预定义
PLLCON	    EQU	0x01d80000
CLKCON	    EQU	0x01d80004
LOCKTIME    EQU	0x01d8000c
	
;****************************************************************************
;存储器控制预定义
;REFRESH	    EQU 0x01c80024

;****************************************************************************
;BDMA目的寄存器
BDIDES0     EQU 0x1f80008
BDIDES1     EQU 0x1f80028

;****************************************************************************
;存储器控制预定义
REFRESH	    EQU 0x01c80024


; 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     0x00000400
SVC_Stack_Size  EQU     0x00001000
ABT_Stack_Size  EQU     0x00000400
FIQ_Stack_Size  EQU     0x00001000
IRQ_Stack_Size  EQU     0x00001000
USR_Stack_Size  EQU     0x00000800

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


; CPU Wrapper and Bus Priorities definitions
CPUW_BASE       EQU     0x01C00000      ; CPU Wrapper Base Address
SYSCFG_OFS      EQU     0x00            ; SYSCFG Offset
NCACHBE0_OFS    EQU     0x04            ; NCACHBE0 Offset
NCACHBE1_OFS    EQU     0x08            ; NCACHBE0 Offset
BUSP_BASE       EQU     0x01C40000      ; Bus Priority Base Address
SBUSCON_OFS     EQU     0x00            ; SBUSCON Offset

;// <e> CPU Wrapper and Bus Priorities
;//   <h> CPU Wrapper
;//     <o1.0>      SE: Stall Enable
;//     <o1.1..2>   CM: Cache Mode
;//                 <0=> Disable Cache (8kB SRAM)
;//                 <1=> Half Cache Enable (4kB Cache, 4kB SRAM)
;//                 <2=> Reserved
;//                 <3=> Full Cache Enable (8kB Cache)
;//     <o1.3>      WE: Write Buffer Enable
;//     <o1.4>      RSE: Read Stall Enable
;//     <o1.5>      DA: Data Abort  <0=> Enable <1=> Disable
;//     <h> Non-cacheable Area 0
;//       <o2.0..15>  Start Address     <0x0-0x0FFFF000:0x1000><#/0x1000>
;//                   <i> SA = (Start Address) / 4k
;//       <o2.16..31> End Address + 1   <0x0-0x10000000:0x1000><#/0x1000>
;//                   <i> SE = (End Address + 1) / 4k
;//     </h>
;//     <h> Non-cacheable Area 1
;//       <o3.0..15>  Start Address     <0x0-0x0FFFF000:0x1000><#/0x1000>
;//                   <i> SA = (Start Address) / 4k
;//       <o3.16..31> End Address + 1   <0x0-0x10000000:0x1000><#/0x1000>
;//                   <i> SE = (End Address + 1) / 4k
;//     </h>
;//   </h>
;//   <h> Bus Priorities
;//     <o4.31>       FIX: Fixed Priorities
;//     <o4.6..7>     LCD_DMA    <0=> 1st  <1=> 2nd  <2=> 3rd  <3=> 4th
;//     <o4.4..5>     ZDMA       <0=> 1st  <1=> 2nd  <2=> 3rd  <3=> 4th
;//     <o4.2..3>     BDMA       <0=> 1st  <1=> 2nd  <2=> 3rd  <3=> 4th
;//     <o4.0..1>     nBREQ      <0=> 1st  <1=> 2nd  <2=> 3rd  <3=> 4th
;//   </h>
;// </e>
SYS_SETUP       EQU     0
SYSCFG_Val      EQU     0x00000001
NCACHBE0_Val    EQU     0x00000000
NCACHBE1_Val    EQU     0x00000000
SBUSCON_Val     EQU     0x80001B1B


;// <e> Vectored Interrupt Mode (for IRQ)
;//   <o1.25> EINT0      <i> External Interrupt 0
;//   <o1.24> EINT1      <i> External Interrupt 1
;//   <o1.23> EINT2      <i> External Interrupt 2                        
;//   <o1.22> EINT3      <i> External Interrupt 3
;//   <o1.21> EINT4567   <i> External Interrupt 4/5/6/7
;//   <o1.20> TICK       <i> RTC Time Tick Interrupt
;//   <o1.19> ZDMA0      <i> General DMA0 Interrupt
;//   <o1.18> ZDMA1      <i> General DMA1 Interrupt
;//   <o1.17> BDMA0      <i> Bridge DMA0 Interrupt
;//   <o1.16> BDMA1      <i> Bridge DMA1 Interrupt
;//   <o1.15> WDT        <i> Watchdog Timer Interrupt
;//   <o1.14> UERR01     <i> UART0/1 Error Interrupt
;//   <o1.13> TIMER0     <i> Timer0 Interrupt
;//   <o1.12> TIMER1     <i> Timer1 Interrupt
;//   <o1.11> TIMER2     <i> Timer2 Interrupt
;//   <o1.10> TIMER3     <i> Timer3 Interrupt
;//   <o1.9>  TIMER4     <i> Timer4 Interrupt
;//   <o1.8>  TIMER5     <i> Timer5 Interrupt
;//   <o1.7>  URXD0      <i> UART0 Rx Interrupt
;//   <o1.6>  URXD1      <i> UART1 Rx Interrupt
;//   <o1.5>  IIC        <i> IIC Interrupt
;//   <o1.4>  SIO        <i> SIO Interrupt
;//   <o1.3>  UTXD0      <i> UART0 Tx Interrupt
;//   <o1.2>  UTXD1      <i> UART1 Tx Interrupt
;//   <o1.1>  RTC        <i> RTC Alarm Interrupt
;//   <o1.0>  ADC        <i> ADC EOC Interrupt
;// </e>
VIM_SETUP       EQU     1
VIM_CFG         EQU     0x00000000

; interrupt table

I_ISPR            EQU     0x01e00020
_ISR_STARTADDRESS EQU	  0xc7fff00


HandleReset     EQU                _ISR_STARTADDRESS				;/* c7fff00 */
HandleUndef	    EQU                _ISR_STARTADDRESS + 4
HandleSWI	    EQU	               _ISR_STARTADDRESS + 4*2
HandlePabort    EQU	               _ISR_STARTADDRESS + 4*3
HandleDabort    EQU	               _ISR_STARTADDRESS + 4*4
HandleReserved  EQU                _ISR_STARTADDRESS + 4*5
HandleIRQ		EQU                _ISR_STARTADDRESS + 4*6
HandleFIQ		EQU                _ISR_STARTADDRESS + 4*7
HandleADC       EQU    	           _ISR_STARTADDRESS + 4*8
HandleRTC       EQU		           _ISR_STARTADDRESS + 4*9
HandleUTXD1     EQU	               _ISR_STARTADDRESS + 4*10
HandleUTXD0     EQU	               _ISR_STARTADDRESS + 4*11
HandleSIO		EQU                _ISR_STARTADDRESS + 4*12
HandleIIC		EQU                _ISR_STARTADDRESS + 4*13
HandleURXD1	    EQU                _ISR_STARTADDRESS + 4*14
HandleURXD0     EQU                _ISR_STARTADDRESS + 4*15
HandleTIMER5    EQU                _ISR_STARTADDRESS + 4*16
HandleTIMER4    EQU                _ISR_STARTADDRESS + 4*17
HandleTIMER3	EQU                _ISR_STARTADDRESS + 4*18
HandleTIMER2    EQU                _ISR_STARTADDRESS + 4*19
HandleTIMER1	EQU                _ISR_STARTADDRESS + 4*20
HandleTIMER0	EQU                _ISR_STARTADDRESS + 4*21
HandleUERR01	EQU				   _ISR_STARTADDRESS + 4*22
HandleWDT		EQU                _ISR_STARTADDRESS + 4*23
HandleBDMA1 	EQU                _ISR_STARTADDRESS + 4*24
HandleBDMA0	    EQU                _ISR_STARTADDRESS + 4*25
HandleZDMA1 	EQU                _ISR_STARTADDRESS + 4*26
HandleZDMA0	    EQU                _ISR_STARTADDRESS + 4*27
HandleTICK		EQU                _ISR_STARTADDRESS + 4*28
HandleEINT4567	EQU                _ISR_STARTADDRESS + 4*29
HandleEINT3	    EQU                _ISR_STARTADDRESS + 4*30
HandleEINT2	    EQU                _ISR_STARTADDRESS + 4*31
HandleEINT1	    EQU                _ISR_STARTADDRESS + 4*32
HandleEINT0	    EQU                _ISR_STARTADDRESS + 4*33	


; Clock Management definitions
CLK_BASE        EQU     0x01D80000      ; Clock Base Address
PLLCON_OFS      EQU     0x00            ; PLLCON Offset
CLKCON_OFS      EQU     0x04            ; CLKCON Offset
CLKSLOW_OFS     EQU     0x08            ; CLKSLOW Offset
LOCKTIME_OFS    EQU     0x0C            ; LOCKTIME Offset

;// <e> Clock Management
;//   <h> PLL Settings
;//   <i> Fpllo = (m * Fin) / (p * 2^s), 20MHz < Fpllo < 66MHz
;//     <o1.12..19> MDIV: Main divider <0x0-0xFF>
;//                 <i> m = MDIV + 8
;//     <o1.4..9>   PDIV: Pre-divider  <0x0-0x3F>
;//                 <i> p = PDIV + 2, 1MHz <= Fin/p < 2MHz
;//     <o1.0..1>   SDIV: Post Divider <0x0-0x03>
;//                 <i> s = SDIV, Fpllo * 2^s < 170MHz
;//     <o4.0..11>  LTIME CNT: PLL Lock Time Count  <0x0-0x0FFF>
;//   </h>
;//   <h> Master Clock
;//   <i> PLL Clock:  Fout = Fpllo
;//   <i> Slow Clock: Fout = Fin / (2 * SLOW_VAL), SLOW_VAL > 0
;//   <i> Slow Clock: Fout = Fin, SLOW_VAL = 0
;//     <o3.5>      PLL_OFF: PLL Off
;//                 <i> PLL is turned Off only when SLOW_BIT = 1
;//     <o3.4>      SLOW_BIT: Slow Clock
;//     <o3.0..3>   SLOW_VAL: Slow Clock divider    <0x0-0x0F>
;//   </h>
;//   <h> Clock Generation
;//     <o2.14>     IIS       <0=> Disable  <1=> Enable
;//     <o2.13>     IIC       <0=> Disable  <1=> Enable
;//     <o2.12>     ADC       <0=> Disable  <1=> Enable
;//     <o2.11>     RTC       <0=> Disable  <1=> Enable
;//     <o2.10>     GPIO      <0=> Disable  <1=> Enable
;//     <o2.9>      UART1     <0=> Disable  <1=> Enable
;//     <o2.8>      UART0     <0=> Disable  <1=> Enable
;//     <o2.7>      BDMA0,1   <0=> Disable  <1=> Enable
;//     <o2.6>      LCDC      <0=> Disable  <1=> Enable
;//     <o2.5>      SIO       <0=> Disable  <1=> Enable
;//     <o2.4>      ZDMA0,1   <0=> Disable  <1=> Enable
;//     <o2.3>      PWMTIMER  <0=> Disable  <1=> Enable
;//   </h>
;// </e>
CLK_SETUP       EQU     0
PLLCON_Val      EQU     0x00056031
CLKCON_Val      EQU     0x00007FF8
CLKSLOW_Val     EQU     0x00000009
LOCKTIME_Val    EQU     0x00000FFF


; Watchdog Timer definitions
WT_BASE         EQU     0x01D30000      ; WT Base Address
WTCON_OFS       EQU     0x00            ; WTCON Offset
WTDAT_OFS       EQU     0x04            ; WTDAT Offset
WTCNT_OFS       EQU     0x08            ; WTCNT Offset

;// <e> Watchdog Timer
;//   <o1.5>      Watchdog Timer Enable/Disable
;//   <o1.0>      Reset Enable/Disable
;//   <o1.2>      Interrupt Enable/Disable
;//   <o1.3..4>   Clock Select  
;//               <0=> 1/16  <1=> 1/32  <2=> 1/64  <3=> 1/128
;//               <i> Clock Division Factor
;//   <o1.8..15>  Prescaler Value <0x0-0xFF>
;//   <o2.0..15>  Time-out Value  <0x0-0xFFFF>
;// </e>
WT_SETUP        EQU     0
WTCON_Val       EQU     0x00000000
WTDAT_Val       EQU     0x00000000


; Memory Controller definitions
MC_BASE         EQU     0x01C80000      ; Memory Controller Base Address

;// <e> Memory Controller
MC_SETUP        EQU     0

;//   <h> Bank 0
;//     <o0.0..1>   PMC: Page Mode Configuration
;//                 <0=> 1 Data  <1=> 4 Data  <2=> 8 Data  <3=> 16 Data
;//     <o0.2..3>   Tpac: Page Mode Access Cycle
;//                 <0=> 2 clks  <1=> 3 clks  <2=> 4 clks  <3=> 6 clks
;//     <o0.4..5>   Tcah: Address Holding Time after nGCSn
;//                 <0=> 0 clk   <1=> 1 clk   <2=> 2 clks  <3=> 4 clks
;//     <o0.6..7>   Toch: Chip Select Hold on nOE
;//                 <0=> 0 clk   <1=> 1 clk   <2=> 2 clks  <3=> 4 clks
;//     <o0.8..10>  Tacc: Access Cycle