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

kzali
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1 year 10 months ago #316689 by kzali

Replied by kzali on topic LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

What is the mod as marked in the attached photo?

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meister
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1 year 10 months ago #316694 by meister

Replied by meister on topic LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

Zayoo wrote:
What happened with enable and error hardware implementation in riocore?

what exactly do you mean?

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meister
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1 year 10 months ago #316695 by meister

Replied by meister on topic LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

kzali wrote:
What is the mod as marked in the attached photo?

it lowers the voltage of the level shifters on the FPGA side to cope with the 1.8V on certain ports, is fixed in the current git for the board

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Zayoo
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1 year 10 months ago #316705 by Zayoo

Replied by Zayoo on topic LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

In old RIO there was error and enable pins that could be enable in configuration file.

Code:

    "enable": {
        "invert": true,
        "pin": "69"
    },

In case of some error, lost communication with LinuxCNC or similar there need to be some pin on board that will indicate such event.

Thanks

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meister
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1 year 10 months ago #316728 by meister

Replied by meister on topic LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

now we have modifier's for all pin's:

Code:

                "enable": {
                    "name": "enable",
                    "type": "bitout",
                    "pins": {
                        "bit": {
                            "modifier": [
                                {
                                    "type": "onerror",
                                    "invert": false
                                }
                            ]
                        }
                    }
                }

seems more complicated at first glance, but is much more flexible

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MirkoCNC
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1 year 10 months ago #316736 by MirkoCNC

Replied by MirkoCNC on topic LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

@meister

Tangbob board:

What is the reason to add the 10k resistors as pull-down or pull-up resistor?

The FPGA is not configured as open-drain or open-source output.

The standard output configuration of the FPGA would not need the resistors.

Correct?

I would like to leave them out, but the cannot be added later when the FPGA has been soldered. That's why I am asking.

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