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Is it a compiler bug??

Kenny Tsai 

unsigned int Begin;
 ...
Begin=*(U16 CODE *)Begin;

 ...
;---- Variable 'Begin' assigned to Register 'DPTR' ----
002C 8F82              MOV     DPL,R7
002E F583              MOV     DPH,A
                                           ; SOURCE LINE # 82
0030 E4                CLR     A
0031 93                MOVC    A,@A+DPTR
0032 F583              MOV     DPH,A	 <--- Error: This line change the DPTR value.
0034 7401              MOV     A,#01H
0036 93                MOVC    A,@A+DPTR <--- Error: Wrong address.
0037 F582              MOV     DPL,A

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  • 0 in reply to Jon Ward

    Thanks a lot for all your kindly reply!

    I know my code looks weird, such as

    Begin=*(U16 CODE *)Begin;//U16 means unsigned short
    In fact, I do it this way for purpose. I run my program on both Target(Real 8051 ICE) and PC(Windows Simulator). See the complete code below...
    void CopyRomData (U8 XDATA *Des,U8 Index)
{
    U8 CODE *pbSrc;
    unsigned int Begin;//Keil 2B, Win32 4B.
    SysSetRomPage(ROM_PAGE1);//Change Bank, it means the following "MOVC" will retrieve data from specify bank.
    Begin=(unsigned int)&((BankH1 CODE *)0)->OffsetData[Index];//Data offsets are located on begginning of each bank.
    WinWork(winGetRomAddr(&Begin));//For simulator.
    Begin=*(U16 CODE *)Begin;
    WinWork(Begin=U16X(Begin));//Hi-Lo exchange, little-Endian for PC.
    WinWork(winGetRomAddr(&Begin));//For simulator.
    pbSrc=(U8 CODE *)Begin;//Both Target and PC could get the right address.
    strcpy(Des,pbSrc);//I just want to copy string, but keil's library seems refer to 'MOVC' internal(It will access to wrong bank), That's why I wrote a loop myself(see pre post).
    SysSetRomPage(ROM_PAGE0);
}

    My target contains 4 banks. I put all my programs on bank#0(prevent bank switch and common area issue), and the others are const data, such as Fonts,Bitmaps,Midi,String(In this case), etc.
    Of course, I have my own tools for creating those bank's images, and , my little simulator could help me to check if there are O.K. or not. When I found the program is O.K. on PC, but error on Target. Then I starting to solve the problem, until I found the compiler's issue that I metion before.

    My CA51-v7.0 product is out of date (1 year/Bought on Sep2002). Can I still download the most update version?

  • 0 in reply to Kenny Tsai

    My CA51-v7.0 product is out of date (1 year/Bought on Sep2002). Can I still download the most update version?

    You should be able to download 7.07 or 7.07a.

    Jon