On Thu, 8 Oct 2020 18:24:23 +0100 Luke Kenneth Casson Leighton <lkcl at lkcl.net> wrote: > self.pi = PortInterface("mmupi") With the port interface it now understandable. I'm currently working on a test_pipe_caller.py -- Tobias Platen <libre-soc[at]platen-software[dot]de>