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disco4now

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Joined: 18/12/2014
Location: Australia
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Posted: 12:46pm 16 May 2025

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What is the power source. Can you try another USB-C cable. Bad power supply can be an issue.

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Gadgetguy
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Joined: 26/04/2025
Location: France
Posts: 97

Posted: 02:38pm 16 May 2025

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Thank you for suggesting - but I tried several power supplies and different cables. They make no difference unfortunately. (For example I tried powered by my laptop got same results as when powered by a brand new raspberry pi 5 USB power supply)

Bleep
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Joined: 09/01/2022
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Posted: 03:02pm 16 May 2025

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Gadgetguy said After doing
> option keyboard us, 0, 0, 600, 50

I see:

Total of 6 Mbytes PSRAM available
> US USB Keyboard Connected on channel 1
> USB Mouse Connected on channel 2

So both keyboard and mouse are detected, but neither works

Try
OPTION KEYBOARD US,0,0,200,150
The repeat rate you are setting is extreemly fast.

Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 7843

Posted: 03:28pm 16 May 2025

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Keyboards that contain other devices like USB hubs or track pads may not work. The PicoMite USB system is not a full version like Windows. Also, there are some RGB keyboards that don't work (I have one that appears as multiple USB devices so that it can have n-key rollover, which you can't have on USB2, never mind USB1 like the Pico, as it's too slow).

To confuse things even more, some powered hubs don't work if you use them with a Pico.

Mick

Zilog Inside! nascom.info for Nascom & Gemini
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Gadgetguy
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Joined: 26/04/2025
Location: France
Posts: 97

Posted: 03:49pm 16 May 2025

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Bleep said

Try
OPTION KEYBOARD US,0,0,200,150
The repeat rate you are setting is extreemly fast.

Thank you. Tried it. Not really different unfortunately.

Gadgetguy
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Posted: 03:51pm 16 May 2025

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Mixtel90 said Keyboards that contain other devices like USB hubs or track pads may not work. The PicoMite USB system is not a full version like Windows. Also, there are some RGB keyboards that don't work (I have one that appears as multiple USB devices so that it can have n-key rollover, which you can't have on USB2, never mind USB1 like the Pico, as it's too slow).

To confuse things even more, some powered hubs don't work if you use them with a Pico.

Thank you. Yes, I am aware. But it seems that some people are using the exact same keyboard (Logitech K400) and it works for them. Hence my confusion. Of course I can use the keyboard that works - I was just hoping to use the Logitech one.

dddns
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Joined: 20/09/2024
Location: Germany
Posts: 485

Posted: 04:36pm 16 May 2025

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disco4now said My Logitec K400+ works OK.
Connects Keyboard and Mouse.

Which version are you using as firmware?
Edited 2025-05-17 02:38 by dddns

Gadgetguy
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Posted: 07:00pm 16 May 2025

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dddns said

disco4now said My Logitec K400+ works OK.
Connects Keyboard and Mouse.

Which version are you using as firmware?

I am on RC23. Please note that I have the K400r model, which is very similar to the K400+ but not 100% the same.

Thank you so much for any ideas!
Edited 2025-05-17 05:07 by Gadgetguy

disco4now

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Joined: 18/12/2014
Location: Australia
Posts: 1000

Posted: 10:40pm 16 May 2025

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dddns said

disco4now said My Logitec K400+ works OK.
Connects Keyboard and Mouse.

Which version are you using as firmware?

Logitech K400+ Works on RC23 HDMIUSB for me.
Only setup is
OPTION RESET HDMIUSB
Note: This is the first version of the reference design, no PSRAM option and no I2S

The VID/PID and recognised devices on the Logitech K400+
-----------------------------------
? MM.INFO(USB VID 1) --> 1133
? MM.INFO(USB VID 2) --> 1133
? MM.INFO(USB PID 1) --> 50475
? MM.INFO(USB PID 2) --> 50475
? MM.INFO(USB 1) --> 1 (Keyboard)
? MM.INFO(USB 2) --> 2 (Mouse)
Edited 2025-05-17 12:19 by disco4now

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Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 7843

Posted: 06:59am 17 May 2025

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A K400R is not a K400 or a K400+. Some keys are programmable. There is obviously different firmware in the keyboard and it is definitely a possibility that the K400R won't work even though the others do. We don't know these things until someone tries them, unfortunately. When your sample of K400R users is one it's very difficult to figure out what's happening!

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

JohnS
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Joined: 18/11/2011
Location: United Kingdom
Posts: 4036

Posted: 09:29am 17 May 2025

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Gadgetguy said I see USB Keyboard connected - but when I type on the keyboard it does not show on the screen. Are there any options to configure the keyboard? (if I plug the keyboard receiver in my laptop it works)

Bear in mind most things you have connected that keyboard to have hardware USB and/or large USB stacks (software). The Pico has neither i.e. no USB hardware and a limited software emulation of USB fitted into the available space.

John

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10223

Posted: 10:10am 17 May 2025

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Gadgetguy: does your board have R54 and R55 fitted? If it does please remove them (completely benign) and see if it makes a difference

Gadgetguy
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Joined: 26/04/2025
Location: France
Posts: 97

Posted: 01:28pm 17 May 2025

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Thank you all for the super helpful comments. I found another no name chinese wireless keyboard that works. So I have now 3 that don't and 2 that do.
I will just live with this (not really comfortable desoldering parts) and acknowledge that my logitech is not compatible. We shall see if it works with the Maximite. I will update you here. Thank you again!

Gadgetguy
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Joined: 26/04/2025
Location: France
Posts: 97

Posted: 07:48pm 24 May 2025

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Update : got the k400+ version. Well, that does not work either. I wonder how it works for others?

disco4now

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Location: Australia
Posts: 1000

Posted: 10:42pm 24 May 2025

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Do you get the same results for VID/PID ?

The VID/PID and recognised devices on the Logitech K400+
-----------------------------------
? MM.INFO(USB VID 1) --> 1133
? MM.INFO(USB VID 2) --> 1133
? MM.INFO(USB PID 1) --> 50475
? MM.INFO(USB PID 2) --> 50475
? MM.INFO(USB 1) --> 1 (Keyboard)
? MM.INFO(USB 2) --> 2 (Mouse)

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Gadgetguy
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Joined: 26/04/2025
Location: France
Posts: 97

Posted: 06:06am 25 May 2025

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disco4now said Do you get the same results for VID/PID ?

The VID/PID and recognised devices on the Logitech K400+
-----------------------------------
? MM.INFO(USB VID 1) --> 1133
? MM.INFO(USB VID 2) --> 1133
? MM.INFO(USB PID 1) --> 50475
? MM.INFO(USB PID 2) --> 50475
? MM.INFO(USB 1) --> 1 (Keyboard)
? MM.INFO(USB 2) --> 2 (Mouse)

I am getting zero for all.

disco4now

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Joined: 18/12/2014
Location: Australia
Posts: 1000

Posted: 07:00am 25 May 2025

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matherp said Gadgetguy: does your board have R54 and R55 fitted? If it does please remove them (completely benign) and see if it makes a difference

You might consider removing these. You should be able to remove mechanically if you dont want to put a soldering iron in there. See this link for the history on this.

Post about R54 and R55

and here
Edited 2025-05-25 17:04 by disco4now

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Gadgetguy
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Joined: 26/04/2025
Location: France
Posts: 97

Posted: 07:39am 26 May 2025

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I will try. What I wonder is why some wireless dongles work and only some others dont. If this is an issue with the resistors then no dongle would work - or is that logic not true?

phil99

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Joined: 11/02/2018
Location: Australia
Posts: 2601

Posted: 08:04am 26 May 2025

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My understanding is there was a batch of USB hub chips that had an error in their output current protection circuit. Removing those resistors disables that.
The board has other over current protection so the USB chip's current protection isn't required.

Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 7843

Posted: 08:14am 26 May 2025

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That's correct. The USB chips that were supplied to JLCPCB's suppliers had the wrong internal configuration, apparently.

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

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