startup.s

hreadx实时嵌入式操作系统源代码,ARM移植. threadx是一个很好的多任务实时嵌入式操作系统

;/*    DATE              NAME                      DESCRIPTION             */ 
;/*                                                                        */ 
;/*                                                                        */ 
;/**************************************************************************/ 
__user_initial_stackheap        FUNCTION    
    LDR   r0, =bottom_of_heap
    MOV   pc, lr
                                ENDFUNC
;/**************************************************************************/ 
;/*                                                                        */ 
;/*  FUNCTION                                               RELEASE        */ 
;/*                                                                        */ 
;/*    TargetInitReset                                                     */ 
;/*                                                           3.0a         */ 
;/*  AUTHOR                                                                */ 
;/*                                                                        */ 
;/*                                                                        */ 
;/*                                                                        */ 
;/*  DESCRIPTION                                                           */ 
;/*                                                                        */ 
;/*    config the data bus, resert watch dog, and initialize the clock     */
;/*                                                                        */ 
;/*  INPUT                                                                 */ 
;/*                                                                        */ 
;/*                                                                        */ 
;/*  OUTPUT                                                                */ 
;/*                                                                        */ 
;/*    None                                                                */ 
;/*                                                                        */ 
;/*  CALLS                                                                 */ 
;/*                                                                        */ 
;/*    None                                                                */ 
;/*                                                                        */ 
;/*  CALLED BY                                                             */ 
;/*                                                                        */ 
;/*    resert handle                                                       */ 
;/*                                                                        */ 
;/*  RELEASE HISTORY                                                       */ 
;/*                                                                        */ 
;/*    DATE              NAME                      DESCRIPTION             */ 
;/*                                                                        */ 
;/*                                                                        */ 
;/**************************************************************************/ 
TargetInitReset					FUNCTION
    LDR             R0,     =WTCON
                                          ;  close the watch dog
    MOV             R1,     #0         
    STR             R1,     [R0]

    LDR             R0,     =INTMSK
                                         ;  mask all interrupu source
    LDR             R1,     =0xFFFFFFFF  
    STR             R1,     [R0]
    LDR             R0,     =INTSUBMSK
    LDR             R1,     =0x07FF
    STR             R1,     [R0]
        
    LDR             R0,     =SRCPND
    LDR             R1,     =0xFFFFFFFF
                                        ;  clear all interrupt flag
    STR             R1,     [R0]
        
    LDR             R0,     =INTPND      
    LDR             R1,     [R0]  
    STR             R1,     [R0]


    ;        
    ; 总线设置，初始化SDRAM
    ;
    LDR             R0,     =BUS_INIT
    LDR             R1,     =BWSCON
    LDMIA           R0!,    {R2-R8}
    STMIA           R1!,    {R2-R8}
    LDMIA           R0!,    {R2-R7}
    STMIA           R1!,    {R2-R7}         
    LDR             R0,     =CAMDIVN
    LDR             R1,     =0
    STR             R1,     [R0]

    ;
    ;  拷贝向量表
    ;
    ;LDR             R0,     =0X30000000
    ;MOV             R1,     #0X00000000
    ;LDMIA           R0!,    {R2-R9}
    ;STMIA           R1!,    {R2-R9}
    ;LDMIA           R0!,    {R2-R9}
    ;STMIA           R1!,    {R2-R9}
        
    ;
    ;  系统时钟设置，启用PLL
    ;  LOCKTIME = 0x00FFFFFF, 锁定时间设置U_LTIME=0xFFF，M_LTIME=0xFFF
    ;  FCLK : HCLK : PCLK = 1 : 4 : 8
    ;
    LDR             R0,     =CLKDIVN 
    LDR             R1,     =(0     << 3)   | (2  << 1)  | 1                
    STR             R1,     [R0]
                                 
    LDR             R0,     =CAMDIVN 
    LDR             R1,     =0                
    STR             R1,     [R0]                             
    
    LDR             R0,     =MPLLCON 
    LDR             R1,     =(127   << 12)  | (2  << 4)  | 1                
    STR             R1,     [R0]
                                 
    LDR             R0,     =UPLLCON 
    LDR             R1,     =(56    << 12)  | (2  << 4)  | 2                
    STR             R1,     [R0]                             

    LDR             R0,     =LOCKTIME
    LDR             R1,     =0x00FFFFFF
    STR             R1,     [R0]

    MOV             PC,     LR

    							ENDFUNC

BUS_INIT 
    DCD ((B1_BWSCON<<4)+(B2_BWSCON<<8)+(B3_BWSCON<<12)+(B4_BWSCON<<16)+(B5_BWSCON<<20)+(B6_BWSCON<<24)+(B7_BWSCON<<28))
    DCD ((B0_Tacs<<13)+(B0_Tcos<<11)+(B0_Tacc<<8)+(B0_Tcoh<<6)+(B0_Tah<<4)+(B0_Tacp<<2)+(B0_PMC))   ;GCS0
    DCD ((B1_Tacs<<13)+(B1_Tcos<<11)+(B1_Tacc<<8)+(B1_Tcoh<<6)+(B1_Tah<<4)+(B1_Tacp<<2)+(B1_PMC))   ;GCS1 
    DCD ((B2_Tacs<<13)+(B2_Tcos<<11)+(B2_Tacc<<8)+(B2_Tcoh<<6)+(B2_Tah<<4)+(B2_Tacp<<2)+(B2_PMC))   ;GCS2
    DCD ((B3_Tacs<<13)+(B3_Tcos<<11)+(B3_Tacc<<8)+(B3_Tcoh<<6)+(B3_Tah<<4)+(B3_Tacp<<2)+(B3_PMC))   ;GCS3
    DCD ((B4_Tacs<<13)+(B4_Tcos<<11)+(B4_Tacc<<8)+(B4_Tcoh<<6)+(B4_Tah<<4)+(B4_Tacp<<2)+(B4_PMC))   ;GCS4
    DCD ((B5_Tacs<<13)+(B5_Tcos<<11)+(B5_Tacc<<8)+(B5_Tcoh<<6)+(B5_Tah<<4)+(B5_Tacp<<2)+(B5_PMC))   ;GCS5
    DCD ((B6_MT<<15)+(B6_Trcd<<2)+(B6_SCAN))    ;GCS6
    DCD ((B7_MT<<15)+(B7_Trcd<<2)+(B7_SCAN))    ;GCS7
    DCD ((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Tsrc<<18)+REFCNT)       

    DCD 0xb2            ;SCLK power saving mode, ARM core burst enable , BANKSIZE 128M/128M - 11/29/2002
    DCD 0x30            ;MRSR6 CL=3clk
    DCD 0x30            ;MRSR7

;/**************************************************************************/
;/*     end of file                                                        */ 
;/**************************************************************************/
    END