We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.
Hi all,
I have searched the forums high and low but still can't find a definitive answer. I'm hoping there are some gurus out there that can point me in the right direction.
My question is: How do I successfully include a 'c' header file in the STARTUP.A51 file? NB: My c header file only includes #defines etc
I was under the impression that the C preprocessor should be able to do this easily? Alas, I can't compile my code because the compiler doesn't recognize the symbols in my STARTUP.A51 (which are specified in my header file).
In case you were wondering, here's some background info:
Basically, I have had to edit the STARTUP.A51 file, in order to redirect some interrupts for my bootloader application.
The interrupts jump to a memory address that I have called (say) "APPLICATION_VECTOR_TABLE_ADDRESS"
This all works fine.
All I want to do is #define APPLICATION_VECTOR_TABLE_ADDRESS in my c header file - because this needs to be shared amongst several source files.
I am using the uVision4 IDE, and C51 compiler V9.01.
Look forward to some responses. Cheers
Hi, Thanks for your replies. Yes, just to clarify I am refering to a .h file.
It clearly isn't just as simple as typing #include headerfile.h in the STARTUP.A51 code - because it if were - it would work - which it isn't.
This is (some of) my STARTUP CODE: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #include "MEMORYMAP.h" $NOMOD51 IDATALEN EQU 80H XDATASTART EQU 0 XDATALEN EQU 0 PDATASTART EQU 0H PDATALEN EQU 0H
~~more statup code here~~
CSEG AT 0 LJMP irq0
CSEG AT 0x100
irq0: CLR A MOV DPTR,#(isBootMode) MOVX A,@DPTR JZ irq0App
irq0Boot: LJMP externalIntISR irq0App: LJMP APP_VEC_ADDRESS+0
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ My MemoryMap.h file only includes the following code:
#define APP_VEC_ADDRESS 0x5000 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Do I have to change the compling/linking order of the source files? ie: Does the linker have to see memorymap.h before it sees STARTUP.A51?
Is STARTUP.A51 even sent through the C preprocessor???
Cheers
Oh I forgot to mention ... if I actually compile the code above (ie: with the #include memorymap.h"), I get the following error:
..\Common\STARTUP.A51(238): error A45: UNDEFINED SYMBOL (PASS-2)
The "UNDEFINED SYMBOL" is refering to APP_VEC_ADDRESS.
Cheers, T
Anyone have any ideas here? Cheers, T
My guess is that your startup file isn't sent through the preprocessor, in which case the assembler will see a strange and unknown symbol, instead of the hexadecimal value you intended the assembler to see.
http://www.keil.com/support/man/docs/a51/a51_mp_c.htm
note the difference between IF and $IF, etc: http://www.keil.com/support/man/docs/a51/a51_ap_conditional.htm and check if there are other such variations or limitations of any other directives that you use...