init.s

uart 试验 点燃led 2440 面向初学者

ULCON0     EQU 0x50000000
UCON0      EQU  0x50000004
UFCON0     EQU  0x50000008
UMCON0     EQU 0x5000000C



UBRDIV0    EQU  0x50000028
GPHCON     EQU  0x56000070
GPHUP      EQU  0x56000078

  
   
  IMPORT Main
  AREA Init,CODE,READONLY
  ENTRY
  LDR R0,=0x3ff0000
  LDR R1,=0xE7FFFF80
  STR R1,[R0]
     LDR SP,=0x3FE1000
     
  
  
    LDR R0,=0x50000000
  LDR R1,=0x03
  STR R1,[R0]
  
    LDR R0,=0x50000004
  LDR R1,=0x05
  STR R1,[R0]
  
    LDR R0,=0x50000008
  LDR R1,=0x00
  STR R1,[R0]
  
    LDR R0,=0x5000000c
  LDR R1,=0x00
  STR R1,[R0]
  
    LDR R0,=0x50000028
  LDR R1,=0x00
  STR R1,[R0]
  
    LDR R0,=0x56000078
  LDR R1,=0x0c
  STR R1,[R0]
  
    LDR R0,=0x56000070
  LDR R1,=0x0a
  STR R1,[R0]

    
  BL Main
  B  .
  END