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

Mecanix
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09 Aug 2024 09:29 #307314 by Mecanix

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

@meister

Similarly, I can't make the stepper work. This is NOT a good start for me man, ouchy lol

The dir works on all axis, however getting no pulse from any of them. Can you also share a stepgen config for an axis? Below is what I've blindly attempted, but getting nowhere (as usual!!).

        {
            "type": "stepdir",
            "pins": {
                "step": {
                    "pin": "13"
                },
                "dir": {
                    "pin": "14"
                }
            },
            "is_joint": true,
            "axis": "X",
            "signals": {
                "velocity": {
                    "net": "joint.0.vel-cmd"
                },
                "position": {
                    "net": "joint.0.motor-pos-fb"
                }
            }
        },

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meister
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09 Aug 2024 09:34 - 09 Aug 2024 09:36 #307316 by meister

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

joints need no signal config

        {
            "type": "stepdir",
            "pins": {
                "step": {
                    "pin": "13"
                },
                "dir": {
                    "pin": "14"
                }
            },
            "is_joint": true,
            "axis": "X"
        },

EDIT: better using the rio-setup tool
even i now have problems doing this in pure json

Last edit: 09 Aug 2024 09:36 by meister.

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meister
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09 Aug 2024 09:39 #307317 by meister

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

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Mecanix
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09 Aug 2024 09:41 - 09 Aug 2024 09:43 #307318 by Mecanix

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

Wow. I didn't get a pulse on any axis with the original config, that's why I tried with the signals. Neither config pulses. Snap, now what.

Pulse PIN is always HIGH. Dir pin works fine though!

Can you show a functional HAL file with a functional step/dir stepper config? I'll compare it to mine and see what's not updating in mine.

Last edit: 09 Aug 2024 09:43 by Mecanix.

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meister
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09 Aug 2024 09:49 #307319 by meister

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

all flashed ? halcompile ?

check it in rio-test gui (do not forget the enable checkbox)

i'm not at home, so i can not test a config and send you, but it should work

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Mecanix
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09 Aug 2024 09:55 #307323 by Mecanix

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

Ah man no rush, you're too kind for real. I'm so not making thousand-dollar parts, just testing this gowin pinouts and timings, and so nothing to worry about.

Yeah gateware flashed, LinuxCNC files overwritten and halcomp'd, everything routine after each generate.

I'll play around with it. Obviously something I'm doing wrong. I'll update if I get anywhere.

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meister
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09 Aug 2024 10:00 #307325 by meister

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

i had done a major update, but i just compared one with an old version and everything looks good.
Unfortunately I can't tell you what the problem might be at the moment

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Mecanix
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09 Aug 2024 10:16 #307327 by Mecanix

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

PIN 13 (x_pulse) is NOT working on my FPGA. w t f

If I swap pins and place the step on PIN 14, I'm getting steps (!!). Told you the problem was at my end, but I'll have to keep you responsible for this one - guilty!! You picked those random pins

In all seriousness, something's not right with PIN13. Let's hope it's just hardware (bad soldering) and not gowin's internals or their place/routing compiler. Yikes. See? That's why I wanted to test ALL PINS on that thing before sending out some PCB work... don't trust - verify!

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meister
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09 Aug 2024 10:17 #307328 by meister

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

if you are playing around anyway, you can also set the enable bits of the stepdir instances to 1 in rio.v

    assign PINOUT_STEPDIR11_STEP = PINOUT_STEPDIR11_STEP_RAW;
    assign PINOUT_STEPDIR11_DIR = PINOUT_STEPDIR11_DIR_RAW;
    wire PINOUT_STEPDIR11_STEP_RAW;
    wire PINOUT_STEPDIR11_DIR_RAW;
    wire UNUSED_PIN_STEPDIR11_EN;
    stepdir stepdir11 (
        .clk(sysclk),
        .step(PINOUT_STEPDIR11_STEP_RAW),
        .dir(PINOUT_STEPDIR11_DIR_RAW),
        .en(UNUSED_PIN_STEPDIR11_EN),
        .velocity(VAROUT32_STEPDIR11_VELOCITY),
        .enable(1),
        .position(VARIN32_STEPDIR11_POSITION)
    );

but if that works, something is wrong with the connection and the board is in ERROR state

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Mecanix
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09 Aug 2024 11:06 - 09 Aug 2024 11:06 #307340 by Mecanix

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

Quick update:

Changed all the pinouts to the ones that works. So far PIN13 and PIN15 are persistently HIGH. As if they were physically shorted but they aren't (good soldering). Just putting this out there, to be aware.

So far got stepgen, spindle pwm, spindle encoder & index, and home switches. [TESTED]. Everything that makes up for the essentials!! Super happy about that.

Those screwed-up pins are discouraging me though. But I'm not coming down to any cynical conclusion yet. I'll have a look in their datasheet again and see if I can find any reason for those being HIGH on crack...

Last edit: 09 Aug 2024 11:06 by Mecanix.

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

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