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step1. °´Ð´ÆÕͨc51³ÌÐò·½·¨£¬½¨Á¢¹¤³Ì£¬ÔÚÀïÃæµ¼Èëmain.cÎļþºÍCFUNC.cÎļþ¡£

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//main.cÎļþ
#include < reg51.h >

#define uchar unsigned char
#define uint unsigned int

extern uint AFUNC(uchar v_achr,bit v_bflag);

void main()
{
    bit BFLAG;
    uchar mav_chr;
    uint    mvintrslt;

    mav_chr=0xd4; BFLAG=1;
    mvintrslt=AFUNC(mav_chr,BFLAG);
}

//CFUNC.cÎļþ

#define uchar unsigned char
#define uint unsigned int

uint AFUNC(uchar v_achr,bit v_bflag)
{
    uchar tmp_vchr;
    uint  tp_vint;

    tmp_vchr=v_achr;
    tp_vint=(uint)v_bflag;
    return tmp_vchr+(tp_vint<<8);
}

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step4. buildÕâ¸ö¹¤³Ìºó½«»á²úÉúÒ»¸öCFUNC.SRCµÄÎļþ£¬½«Õâ¸öÎļþ¸ÄÃûΪCFUNC.A51£¨Ò²¿ÉÒÔͨ¹ý±àÒëÑ¡ÏîÖ±½Ó²úÉúCFUNC.A51ÎÄ
       ¼þ£©£¬È»ºóÔÚ¹¤³ÌÀïÈ¥µô¿âÎļþ£¨ÈçC51S.Lib)ºÍCFUNC.c,¶ø½«CFUNC.A51Ìí¼Óµ½¹¤³ÌÀï¡£

//CFUNC.SRCÎļþÈçÏÂ
.\CFUNC.SRC generated from: CFUNC.c
NAME CFUNC

?PR?_AFUNC?CFUNC     SEGMENT CODE
?BI?_AFUNC?CFUNC     SEGMENT BIT OVERLAYABLE
    PUBLIC    ?_AFUNC?BIT
    PUBLIC    _AFUNC

    RSEG  ?BI?_AFUNC?CFUNC
?_AFUNC?BIT:
    v_bflag?041:   DBIT   1
; #define uchar unsigned char
; #define uint unsigned int
;
; uint AFUNC(uchar v_achr,bit v_bflag)

    RSEG  ?PR?_AFUNC?CFUNC
_AFUNC:
    USING    0
            ; SOURCE LINE # 5
;---- Variable 'v_achr?040' assigned to Register 'R7' ----
; {
            ; SOURCE LINE # 6
;     uchar tmp_vchr;
;     uint    tp_vint;
;
;     tmp_vchr=v_achr;
            ; SOURCE LINE # 10
;---- Variable 'tmp_vchr?042' assigned to Register 'R5' ----
    MOV      R5,AR7
;     tp_vint=(uint)v_bflag;
            ; SOURCE LINE # 11
    MOV      C,v_bflag?041
    CLR      A
    RLC      A
;---- Variable 'tp_vint?043' assigned to Register 'R6/R7' ----
;     return tmp_vchr+(tp_vint<<8);
            ; SOURCE LINE # 12
    MOV      R6,A
    MOV      R4,#00H
    CLR      A
    ADD      A,R5
    MOV      R7,A
    MOV      A,R4
    ADDC     A,R6
    MOV      R6,A
; }
            ; SOURCE LINE # 13
?C0001:
    RET
; END OF _AFUNC

    END

step5. ¼ì²émain.cµÄ¡°Generate Assembler SRC File¡±ºÍ¡°Assemble SRC File¡±ÊÇ·ñÓÐЧ£¬ÈôÊÇÓÐЧÔòµã»÷ʹ¼ì²é¿ò±ä³ÉÎÞЧ״
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//main.c
#include < reg51.h >

#define uchar unsigned char
#define uint unsigned int

extern uint AFUNC(uchar v_achr,bit v_bflag);

void main()
{
    bit BFLAG;
    uchar mav_chr;
    uint    mvintrslt;

    mav_chr=0xd4; BFLAG=1;
    mvintrslt=AFUNC(mav_chr,BFLAG);
}

//a51FUNC.c

#define uchar unsigned char
#define uint unsigned int

extern uint CFUNC(uint);

uint AFUNC(uchar v_achr,bit v_bflag)    //c51дµÄ»ã±àº¯Êý£¬×îÖÕÒª±ä³É»ã±à´úÂë
{
    uchar tmp_vchr;
    uint  tp_vint;

    tmp_vchr=v_achr;
    tp_vint=(uint)v_bflag;

    return CFUNC(tp_vint);             //ÕâÀïµ÷ÓÃÒ»¸öc51º¯Êý
}

//c51FUNC.c

#define uchar unsigned char
#define uint unsigned int

uint CFUNC(uint v_int)                //±»»ã±àº¯Êýµ÷ÓÃc51º¯Êý
{
    return v_int<<2;
}

µÚ¶þ²½Êǰ´89852Ìû×ÓµÄstep2,3,4°ÑÓÃc51дµÄ(»ã±à)º¯Êý±ä³Éa51Îļþ(½ñÌìÎÒÊÔÁËÒ»ÏÂstep3¿ÉÒÔ²»Òª)Àý³Ì±àÒë½á¹ûÈç
주
; .\a51func.SRC generated from: a51func.c
NAME    A51FUNC

?PR?_AFUNC?A51FUNC   SEGMENT CODE
?DT?_AFUNC?A51FUNC   SEGMENT DATA OVERLAYABLE
?BI?_AFUNC?A51FUNC   SEGMENT BIT OVERLAYABLE
    EXTRN    CODE (_CFUNC)
    PUBLIC    ?_AFUNC?BIT
    PUBLIC    _AFUNC

    RSEG  ?DT?_AFUNC?A51FUNC
?_AFUNC?BYTE:
   tmp_vchr?042:   DS   1

    RSEG  ?BI?_AFUNC?A51FUNC
?_AFUNC?BIT:
    v_bflag?041:   DBIT   1
; //a51FUNC.c
;
; #define uchar unsigned char
; #define uint unsigned int
;
; extern uint CFUNC(uint);
;
; uint AFUNC(uchar v_achr,bit v_bflag)

    RSEG  ?PR?_AFUNC?A51FUNC
_AFUNC:        ;c51ËùдµÄº¯Êý²úÉúµÄ»ã±à´úÂë´ÓÕâÀ↑ʼ
    USING    0
            ; SOURCE LINE # 8
;---- Variable 'v_achr?040' assigned to Register 'R7' ----
; {
            ; SOURCE LINE # 9
;     uchar tmp_vchr;
;     uint  tp_vint;
;
;     tmp_vchr=v_achr;
            ; SOURCE LINE # 13
    MOV      tmp_vchr?042,R7
;     tp_vint=(uint)v_bflag;
            ; SOURCE LINE # 14
    MOV      C,v_bflag?041
    CLR      A
    MOV      R6,A
    RLC      A
    MOV      R7,A
;---- Variable 'tp_vint?043' assigned to Register 'R6/R7' ----
;      ÕâÀï˵Ã÷R6,R7ÄÚÈݾÍÊÇtp_vint
;     return CFUNC(tp_vint);
            ; SOURCE LINE # 16
    LCALL    _CFUNC    ;ÕâÀïµ÷ÓÃÁËÓÃc51дµÄº¯Êý
; }
            ; SOURCE LINE # 17
?C0001:
    RET
; END OF _AFUNC

    END

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