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Hello,
I use the NXP LPC 2368 and want to write a function to save the exceptions Data Abort Error, Undefined Instruction Error and Pre-fetch Abort Error in a seriel EEPROM and after reset the CPU. How can I overwrite the dummy exception handler Undef_Handler, PAbt_Handler and DAbt_Handler with C code? I found the technical support: http://www.keil.com/support/docs/3027.htm If I write the irq-functions there is no warning and no error so far so good. But if I test the irq the PC stuck always in the dummy function in startup and not in my own function! Somebody have a idea?
Thanks for the tip. But now the Compiler Error: "system\LPC2300.s(615): error: A1516E: Bad symbol 'ProgramAbortHandler', not defined or external" comes.
Here my Code: Startup-File
; Exception Vectors ; Mapped to Address 0. ; Absolute addressing mode must be used. ; Dummy Handlers are implemented as infinite loops which can be modified. Vectors LDR PC, Reset_Addr LDR PC, Undef_Addr LDR PC, SWI_Addr LDR PC, PAbt_Addr LDR PC, DAbt_Addr NOP ; Reserved Vector ; LDR PC, IRQ_Addr LDR PC, [PC, #-0x0120] ; Vector from VicVectAddr LDR PC, FIQ_Addr Reset_Addr DCD Reset_Handler Undef_Addr DCD Undef_Handler SWI_Addr DCD SWI_Handler PAbt_Addr DCD ProgramAbortHandler DAbt_Addr DCD DAbt_Handler DCD 0 ; Reserved Address IRQ_Addr DCD IRQ_Handler FIQ_Addr DCD FIQ_Handler IMPORT SWI_Handler Undef_Handler B Undef_Handler ;SWI_Handler B SWI_Handler ;Don't need the dummy PAbt handler ;PAbt_Handler B PAbt_Handler DAbt_Handler B DAbt_Handler IRQ_Handler B IRQ_Handler FIQ_Handler B FIQ_Handler
File irq.c
void ProgramAbortHandler(void) __irq { // For Test while(1); }
I think I have to declare the function because it is defined in another file. How can I do this in Assembler? Thanks
Add the following line to the startup before referencing your function:
IMPORT ProgramAbortHandler
Just add
IMPORT IntSPI_isr
at the beginning of your startup file and i think that would be it :)
I write too slowly :) And the answer above is better than mine, because I used the name of my own handler :D
Thank you very much for the help. The startup assembler is very hard to understand for me. The solution above works! But now I get a warning (after the linking process): Warning: L6306W: '~PRES8' section lpc2300.o(RESET) should not use the address of 'REQ8' function ProgramAbortHandler. In the technical Support I read this: http://www.keil.com/support/docs/3268.htm So what I did was PRESERVE8 put in the first line of my start up code. But after i get a compiler error: error: A1355U: A Label was found which was in no AREA Now the Joke of the Day: The label is the PRESERVE8 comand! First I think I wrote wrong. But I copy and paste it of the technical support document!
So the solution of the technical support is not the best way. Anybody know why there is a linker-warning and how I can solve it?
Like all directives in asm, the PRESERVE8 needs to have some whitespace before it. If it starts in column 1 then it's a label and not a directive.
thank you very much for the fast help. After I insert a space before the asm PRESERVE8 everything works fine! I am sorry for my lack of knowledge. So I wrote now Exception Handlers for the PAbt, DAbt and Undef Instructions. I use the RTX OS so I additinal check for the stack overflow and wrote my own os_stk_overflow function. Somebody know further exceptions so I can handle? If no so I thank again very much for the good help.