Hi Bob

Did you have to make any changes to get the twiapi.c to compile? I am having issues with the two ARM include files generating hundreds if not thousands of errors, all to do with some of the statements like EQU in those files.

It turns out I did change those two files. In ioat91sam7x256.h, I moved the else from line 2744 to the line before the end of the file so the assembly EQU's fell within the #if 0.
In lib_AT91SAM7X256.h, I changed the void parameter on some function prototypes. I don't believe this change was required; I was probably experimenting with compiler warnings. Here is the diff output. Hopefully this will work for you, as I will not be able to check the forum for a few days.
Regards,
Bob

[bobf@www ARM7_AT91SAM7S]$ diff lib_AT91SAM7X256.h ~/fw131/heavy/controller/freertos/portable/GCC/ARM7_AT91SAM7S/lib_AT91SAM7X256.h
60c60
< void (*newHandler)() ) // \arg address of the interrupt handler
---
> void (*newHandler) (void) ) // \arg address of the interrupt handler
135c135
< void (*Handler) (void) ) // \arg Interrupt Handler
---
> void (*Handler) () ) // \arg Interrupt Handler


[bobf@www ARM7_AT91SAM7S]$ diff ioat91sam7x256.h ~/fw131/heavy/controller/freertos/portable/GCC/ARM7_AT91SAM7S/ioat91sam7x256.h
2744c2744
<
---
> #endif
4697c4697
< #endif
---
>

Thanks for the diffs Bob.
Moving the endif got rid of the errors and the compile/link
finished fine. I didn't bother with the void changes, they are
not necessary, but do get rid of a lot of warnings.
Nice work, much appreciated