On the documentation section on your website you state that FPGA code for Atom Display is available as open source. Where can it be downloaded?

If I use the M5Paper alone, without any module plugged on Ports ABC, I am able to use the function Shutdown(time) and it works. However when some module is plugged in (for instance, the BPS sensor module) whenever i make a call to Shutdown(time) the system hangs. Is this an expected behavior?