Hello!
I have uVision that compiles fine with the C51 v7.03 compiler and the related package, but not complete with the 8.06. I used two different Keil installations. All files are in the same folder.
In the 8.06 I get linker errors like "object does not fit in to pdata page" and "0080H". This looks like the compiler was thinking the PDATA was only 128 bytes, but it is set to 256 bytes in the startup.a51. Any clue what's different in the newer Keil package?
Also there is a warning in 8.06 (which does not show in 7.03) "converting non-pointer to pointer" on this
ptr_xdata = sPtr_obj->Adresse;
while the vars are set like this:
uchar uc_set_obj( uchar pdata *ptr_Set) { uchar i; uchar xdata *ptr_xdata; struct stOBJADR code *sPtr_obj; sPtr_obj=&Obj[*ptr_Set]; . . . ptr_xdata = sPtr_obj->Adresse; }
The struct stOBJADR has a member "uint Adresse;"
I can see no wrong use of the pointers. I just want to be sure that the warning does not affect the code to not work correctly.
The compiler will do exactly what you tell it to do - but, as mentioned earlier, if you cannot express what you want correctly, then the compiler cannot guess for you... "the compiler was unsure how to handle it." Often, a compiler will try to figure out what you ment and instead of an error issue a warning, which, in a way means "the compiler was unsure how to handle it.". Then, it is up to you to accept "unsure" or find the reason for the warning and remove it. Should you decide to accept 'unsure' please tell me and I will avoid buying any of your products.
Again, the compiler does what you tell it - but, if you tell it rubbish, you will get rubbish as a result.
Hence the well-known programming term, GIGO = Garbage In; Garbage Out.
I thought that in the OK it was "RIRO rubbish in, rubbish out" :)
Erik
Yes, I suppose it should be - but we are beset by far too many americanisms...
:-(