IO Questions around mixing IO between Ethercat and Pi 5?

that EasyCAT is an interesting bit of kit...

github.com/zmrdko/3DWorks_EasyCAT/blob/main/3DWorks_EasyCAT.ino

you can find some examples of IO, which I tried.

looking at your code, are you getting 64 digital inputs and outputs you "could" address over EtherCat?

looking at your code your passing around the digital io around as a single 32bit int and you have 2 of them...

uint32_t outDigitalSet0;
uint32_t outDigitalSet1;

if you mix that with an I2C or SPI extender couldn't those be mapped to an I/O extender of some kind?

i am sorry, it was some time ago. I believe that you can customize PDOs as you need.