nf_lib.a51

mp3播放器

;//! @file nf_lib.a51,v
;//!
;//! Copyright (c) 2003-2004
;//!
;//! Use of this program is subject to Atmel's End User License Agreement.
;//! Please read file license.txt for copyright notice.
;//!
;//! @brief This file contains the asm procedure for optimize the bootstrap
;//!
;//! The quick mode, the loading NF to cram and start hardware contexte 0
;//!
;//! @version 1.1 snd3-refd1-1_9_5 $Id: nf_lib.a51,v 1.1 2004/12/20 17:43:02 ppatron Exp $
;//!
;//! @todo
;//! @bug


$TITLE      (*** snd3-refd1-1_9_5 ***)

;//_____ I N C L U D E S ______________________________________________________
#define  ASM_INCLUDE
#define KEIL
#include "config.h"

;//_____ M A C R O S __________________________________________________________

;//_____ D E F I N I T I O N S ________________________________________________

ASM_MODULE   SEGMENT CODE
RSEG    ASM_MODULE

;//_____ D E C L A R A T I O N S ______________________________________________

PUBLIC  _nf_upload
PUBLIC  _nf_download



;//! @brief Transfer packet of 16 bytes from NF to CRAM, through C51 core.
;//!
;//! @param Pointer (xdata only) on CRAM
;//! @param number of 16 bytes packet
;//!
;//! @return none
;//!
_nf_upload:
   MOV      DPL,R7  ; Init the DPTR to beginning of pointer
   MOV      DPH,R6

   MOV      A,R5
   JNZ      loop_16_up     ; if R5 <> 0 then resume transfer
   RET

loop_16_up:
   MOV      A,NFDATF
   MOVX     @DPTR,A        ;1
   INC      DPTR
   MOV      A,NFDATF
   MOVX     @DPTR,A        ;2
   INC      DPTR
   MOV      A,NFDATF
   MOVX     @DPTR,A        ;3
   INC      DPTR
   MOV      A,NFDATF
   MOVX     @DPTR,A        ;4
   INC      DPTR
   MOV      A,NFDATF
   MOVX     @DPTR,A        ;5
   INC      DPTR
   MOV      A,NFDATF
   MOVX     @DPTR,A        ;6
   INC      DPTR
   MOV      A,NFDATF
   MOVX     @DPTR,A        ;7
   INC      DPTR
   MOV      A,NFDATF
   MOVX     @DPTR,A        ;8
   INC      DPTR
   MOV      A,NFDATF
   MOVX     @DPTR,A        ;9
   INC      DPTR
   MOV      A,NFDATF
   MOVX     @DPTR,A        ;10
   INC      DPTR
   MOV      A,NFDATF
   MOVX     @DPTR,A        ;11
   INC      DPTR
   MOV      A,NFDATF
   MOVX     @DPTR,A        ;12
   INC      DPTR
   MOV      A,NFDATF
   MOVX     @DPTR,A        ;13
   INC      DPTR
   MOV      A,NFDATF
   MOVX     @DPTR,A        ;14
   INC      DPTR
   MOV      A,NFDATF
   MOVX     @DPTR,A        ;15
   INC      DPTR
   MOV      A,NFDATF
   MOVX     @DPTR,A        ;16
   INC      DPTR

   DEC      R5
   MOV      A,R5
   JNZ      loop_16_up     ; if R5 <> 0 then resume transfer
   RET



;//! @brief Transfer packet of 16 bytes from CRAM to NF, through C51 core.
;//!
;//! @param Pointer (xdata only) on CRAM
;//! @param number of 16 bytes packet
;//!
;//! @return none
;//!
_nf_download:
   MOV      DPL,R7  ; Init the DPTR to beginning of pointer
   MOV      DPH,R6

   MOV      A,R5
   JNZ      loop_16_down     ; if R5 <> 0 then resume transfer
   RET

loop_16_down:
   MOVX     A, @DPTR
   MOV      NFDAT, A    ; 1
   INC      DPTR
   MOVX     A, @DPTR
   MOV      NFDAT, A    ; 2
   INC      DPTR
   MOVX     A, @DPTR
   MOV      NFDAT, A    ; 3
   INC      DPTR
   MOVX     A, @DPTR
   MOV      NFDAT, A    ; 4
   INC      DPTR
   MOVX     A, @DPTR
   MOV      NFDAT, A    ; 5
   INC      DPTR
   MOVX     A, @DPTR
   MOV      NFDAT, A    ; 6
   INC      DPTR
   MOVX     A, @DPTR
   MOV      NFDAT, A    ; 7
   INC      DPTR
   MOVX     A, @DPTR
   MOV      NFDAT, A    ; 8
   INC      DPTR
   MOVX     A, @DPTR
   MOV      NFDAT, A    ; 9
   INC      DPTR
   MOVX     A, @DPTR
   MOV      NFDAT, A    ; 10
   INC      DPTR
   MOVX     A, @DPTR
   MOV      NFDAT, A    ; 11
   INC      DPTR
   MOVX     A, @DPTR
   MOV      NFDAT, A    ; 12
   INC      DPTR
   MOVX     A, @DPTR
   MOV      NFDAT, A    ; 13
   INC      DPTR
   MOVX     A, @DPTR
   MOV      NFDAT, A    ; 14
   INC      DPTR
   MOVX     A, @DPTR
   MOV      NFDAT, A    ; 15
   INC      DPTR
   MOVX     A, @DPTR
   MOV      NFDAT, A    ; 16
   INC      DPTR

   DEC      R5
   MOV      A,R5
   JNZ      loop_16_down     ; if R5 <> 0 then resume transfer
   RET

END