LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

the tangnano9k is directly connected to the bob, you can simply solder an adapter to the DB25 Connector.

BUT !!! the FPGA is not realy 5V tolerant, pullups are ok, i have no problem with my china BOB, but i can't say if it works with other BOB's

The Ethernet-Board is an optional UDP to SPI bridge, so you can use any PC.

And before you are frustrated, please try to build the project before buying the hardware, some user have problems to compile the firmware.

EDIT: you can map each pin to more or less each function
 

the 8Inputs + 8Outputs Board's also works now
the boards are stackable !

 

ok, I was hoping the Tang Nano 9k might be as compact as I'd done with an Arduino Pro Mini(5v) and a DB25 breakout connector. I had an esp32 working for a little bit but the driver chips I used must have been on the edge of working for driving the opto-isolators on the CNC driver board ahead of the TB6600 drivers as it got intermittent after a few tests.  I was hoping to not put such a big box behind the CNC although a meter long RS232 cable might still work.  This is the same reason why I've not jumped on Remora on the CNC. I've had rPi/LinuxCNC/Remora working on a K40 laser cutter and an Ender 3 3D printer so your FPGA setup has my interest.

I run only Linux software but I will try to create a build environment and build your firmware and see how it goes. Without configuration files building the firmware sounds like the way to make it work on each machine.

Thanks for explaining that Ethernet/UDP/SPi board.  Sounds like I using either rPi and TangNano9K directly over SPI(~300mm length) or the Ethernet option with either rPi or desktop/laptop. Nice.

I'll start looking around for a BOB. Should be some that'll work with the ESP32 and RIO interchangeably and hopefully with enough drive for the opto-isolators.

 

How about LPT-port to connect tang via SPI protocol ?

Are these for Tang Nano as well and are the boards open source

MaxEkb77 wrote:

How about LPT-port to connect tang via SPI protocol ?
 

good idea, but i don't know how to implement it and have no time to learn it but it's possible