nflashset.asm

DSP+MP3+USB+FAT12的所有源程序(C语言编写)

;******************************************************************************
;
;Copyright (c) 2004 GoldInfo Technology Co., Ltd.
;
;Module Name:
;
;         NFlash.ASM
;
;Abstract:
;
;          Module related to The NandFlash write and read
;
;Environment:
;
;        ccs2.0 IDE
;
;Revision History:
;
;        02/03/2004      Mikal   created
;
;
;;*****************************************************************************


	            .mmregs


	            .sect	"code"
;********************************************************************
  ;global function
                .global  _G_NFlashData
  		
                .bss  _G_NFlashData ,1         


NAND_DATA       .set  	05ffch
NAND_SET_ALE  	.set	05ffdh
NAND_SET_CLE  	.set	05ffeh
 
 


       
                  .def    _Nand_Write_Data      
_Nand_Write_Data:
                   nop
                   nop
                   nop
                   pshm    AL     ; save  the data to write
                   nop
                   nop
                   nop
                   portw   *SP(0), NAND_DATA
                   frame   1
                   ret




                   .def    _NandWrite_SET_CLE
_NandWrite_SET_CLE
                    nop
                    nop
                    nop
                    pshm    AL        ; save  the data to write
                    nop
                    nop
                    nop
                    
                    ; write data
                    portw   *SP(0), NAND_SET_CLE
                    frame   1
                    ret





                     .def    _NandWrite_SET_ALE
_NandWrite_SET_ALE
                     nop
                     nop
                     nop
                     pshm    AL     ; save  the data to write
                     nop
                     nop
                     nop
                     
                     ; write data
                     portw   *SP(0), NAND_SET_ALE
                     frame   1
                     ret






                     .def    _AtaBusyStatusCheck
_AtaBusyStatusCheck:
BusyStatusCheck 
	              	 nop
		             nop
		             nop
                     bc      BusyStatusCheck, BIO
                     nop
                     nop
                     ret
        


        
                .def  _NFlashReadData
_NFlashReadData:
                  nop
                  nop
                  nop
                  stm #(_G_NFlashData) , AR7
                  nop
                  portr   NAND_DATA , *AR7
                  nop
                  nop
                  nop
    
                  ret