Hi,

> - are the pins 'provided' by an extender as usable as normal GPIO pins (for 
> instance to connect and LCD, or a cascaded extender)?

Coincidentally, the example described previously with the HD44780 driver over 
an I2C IO-expander is now officially an example.
https://github.com/roboterclubaachen/xpcc/blob/develop/examples/stm32f4_discovery/display/hd44780/main.cpp

Cheers,
Niklas
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