Sharing data between PULP and HWPE on HERO

[Adi]

Hi,


Initially I used the TCDM to share data between PULP and a HWPE in bigpulp, but I couldn't make the TCDM large enough because of FPGA BRAM and routing limitations.
I understand that I can also use rt_alloc.h API to share data between PULP and the HWPE, is that right? 
If so, how can I do it? I tried using the API but I see that the HWPE doesn't read the expected data so clearly I'm not using it right. Is there a working example somewhere?

Thanks!
Adi