Erik, Andy, A while ago, I read in one of the threads an answer from one of you (if I remember well) regarding the abstraction of the compiler datatypes. One of you was giving examples of how, for instance, abstract the 'unsigned char' by defining UCHAR, the 'char' by defining SCHAR, and so on in a separate header file. This all to make your code less compiler dependent. I want to apply this solution, because I find it a nice one (separation between your code and typical compiler properties makes your code as much as possible portable). The problem is: I simply can't find back anymore this thread. Is there any chance one of you still know this? Of course, if other people reading this message would know it, I would be equally thankful! ;-) --Geert
is this what you were looking for: http://www.keil.com/forum/docs/thread2472.asp Note that I would use "U8" rather then "UCHAR" because it explicitly & unambiguously tells you the size of the type. And it's shorter to type! ;-) I would also use #defines for al compiler-specific keyword extensions; eg,
#if defined __C51__ // Keil C51 #define DATA data #define XDATA xdata #define AT(adr) _at_ adr //etc #elif defined __BORLANDC__ // Borland C #define DATA #define XDATA #define AT(adr) //etc #else #error Unknown Compiler #endif
Indeed, Andy This is exactly what I was looking for. Thanks very much for the prompt answer and thanks for the extra input too! Best regards, --Geert
OK, here is the whole symphony Global Variables are defined in a .h file included in every module, one module #defines DATACT.
#define U1 bit #define UB8 unsigned char bdata #define U8 unsigned char #define S8 signed char #define UI8 unsigned char idata #define UX8 unsigned char xdata #define UC8 unsigned char code #define U16 unsigned short #define S16 signed short #define UI16 unsigned short idata #define UX16 unsigned short xdata #define UC16 unsigned short code #define U32 unsigned long #define UX32 unsigned long xdata #define UI32 unsigned long idata #define UC32 unsigned long code // pointer in data in #define U8DI unsigned char idata * data // data idata #define U8DX unsigned char xdata * data // data xdata #define U8IX unsigned char xdata * idata // idata xdata #define U8IC unsigned char code * idata // idata code #define U8DC unsigned char code * data // data code #define U8XC unsigned char code * xdata // xdata code #define U8CC unsigned char code * code // code code #define U16DX unsigned short xdata * data // data xdata #define U16IX unsigned short xdata * idata // idata xdata #define U16CC unsigned short code * code // code code #ifdef DATACT #define DOX #else // !DATACT #define DOX extern #endif // DATACT #define UB DOX U1 // bit #define UC DOX U8 // unsigned char #define UI DOX U16 // unsigned short #define UL DOX U32 // unsigned long #define UBC DOX UB8 // unsigned char bdata #define UCI DOX UI8 // unsigned char idata #define UCX DOX UX8 // unsigned char xdata //#define UXR DOX UX8 // unsigned char xdata //#define UCC DOX UC8 // unsigned char code #define UII DOX UI16 // unsigned short idata #define UIX DOX UX16 // unsigned short xdata //#define UIC DOX UC16 // unsigned short code #define ULI DOX UI32 #define ULX DOX UX32 #define UCDI DOX U8DI // unsigned char idata * data #define UCDX DOX U8DX // unsigned char xdata * data #define UCIX DOX U8IX // unsigned char xdata * idata #define UCCX DOX U8CC // unsigned char code * code #define UCDC DOX U8DC // unsigned char code * data #define UIDX DOX U16DX // unsigned short xdata * data #define UIIX DOX U16IX // unsigned short xdata * idata #define UIDC DOX U8DC // unsigned short code * data #ifdef DATACT #define UXRG(name,addr) UX8 name _at_ addr #else #define UXRG(name,addr) extern UX8 name #endif #define FALSE 0 #define TRUE ~FALSE
Superb! Thanks both of you for your valuable input! --Geert