sharing data between the CPUs

I'm programming in C++ and I've gotten small programs to run on the DS, but I can't get data from one cpu to the other. The best I've done is be able to initialize a variable on the ARM7 and then read it once on the ARM9, but the ARM7 can no longer modify the variable.

I am aware that there is a section of memory for communication between the CPUs, but I could not get it working, and I would also like to know how to share the main memory to share large chunks of data(maybe by putting a pointer in the FIFO).

http://forum.gbadev.org would probably be better for DS coding help. Most people here are end-users, not developers.

Yes, it's GBAdev, but there are three active DS sections as well.

thanks, I actually figured it out reading over there