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?
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.