Lpc2000

> Im not calling the IAP routines from Thumb mode. Do you have to do 
> that. There is a command in the gcc compiler "-mthumb-interwork" 
> that should support calls between ARM and THUMB mode..
> Then... im not so good at writing code in assembler, I can just 
read 
> it so.. any more help is very welcome.

Yes. If you're running ARM code and u need to use the IAP u need 2do 
a thumb instruction.

Though I'm not familiar with your compiler, does GCC have thumb/arm 
directives that u can add-on to fuction definitions? Something 
like...

typdef _thumb void (*IAP)(unsigned int[], unsigned int[])
{
.....
}

If yes, then modifying your IAP call to a thumb function should do 
it.