-
Updated 2023-07-12: Hello, Guest! Welcome back, and be sure to check out this follow-up post about our outage a week or so ago.
Getting G3 Whisper Perch USB working
- Thread starter croissantking
- Start date
croissantking
Well-known member
Do you mean to update my schematic with what I’ve added since your suggestions?
Phipli
Well-known member
If you could put all the components you added on it, like the capacitors around the main chip etc, then I can mark what I think they should be.
Is VCC3 showing 3.3V? Are you able to check?
croissantking
Well-known member
Bear with me, I’ll get onto these.
cheesestraws
Well-known member
One other thing to check: the whole mouse thing sounds rather like signal integrity issues to me, at a wild guess. The instructions in the application note for the chip say to make sure that the 24MHz is kept away (unspecified amount of 'away' though) from D-/D+. Might be worth checking you haven't parked the crystal on top of them or anything...
croissantking
Well-known member
It's a 48Mhz part I've used. It is away from the data lines. Interesting that the data lines on the personaity card don't have guard traces either side as in the reference design?
croissantking
Well-known member
Updated schematic:
croissantking
Well-known member
Yes, VCC3 is at 3.3V. Is my diode at D2 the right way round? Cause it’s not labelled on the PCB.
croissantking
Well-known member
Here's the errors that happen with the wireless mouse connected (it does work though):
Here's what happens when a USB card reader is connected, which causes the port to become non-functional requiring a system restart.
Here's what happens when a USB card reader is connected, which causes the port to become non-functional requiring a system restart.
Last edited:
mg.man
Well-known member
Well, it's not a Keyspan (although, I might have one of those somewhere
), but what I do have to hand is this:
...which seems to also be a pretty simple implementation.
Phipli
Well-known member
That looks like the reference design I shared earlier.Well, it's not a Keyspan (although, I might have one of those somewhere
View attachment 54038
View attachment 54039
...which seems to also be a pretty simple implementation.
croissantking
Well-known member
Just to check I am OK testing the card without the backplate fitted? Just noticed that the ground plane goes to the screw mounts of said backplate.
croissantking
Well-known member
Swapping in a 470pF cap at C113 has stopped the USB working completely. Are you sure this is the right value?
croissantking
Well-known member
Hmm seems to be working again
Phipli
Well-known member
Not sure, but fairly sure. We are trying to work out values for a design we don't have based on designs that aren't quite the same.
Looking at the design, in this instance I don't think switching in that 470pF cap caused the issue you described.
Phipli
Well-known member
Shouldn't be an issue.
croissantking
Well-known member
Okay, here's the latest update after having worked on the board some more - it's all good news.
I can now plug my Logitech Unifying Receiver into the side of the Apple keyboard, and both the mouse (MX Master 2S) and keyboard work together perfectly in tandem. This is a big improvement as before, the side ports didn't work.
The scanner (CanoScan n1220u) now makes noises. After plugging in, I can try to load the scanning software and the scanner tries to initialise (the carriage moves). However, the message that the scanner could not be found pops up, and that's the end of the show. Good news is that I can unplug the scanner and plug something else back in, whereas previously the scanner would hang up the USB bus completely.
The card reader still does not seem to work, it's detected as a device but it will not mount my CF card. However, as with the scanner, it also no longer hangs up the bus as it did before.
Plugging in a USB 3.0 External HDD (An OWC Mercury OTG with 1.5GB SATA HDD) causes a sudden restart of the system. Just before restart, I see that the volume changes (with an indicator on-screen like you'd see if you pushed up or down on the volume of a PowerBook, and an alert sound). The drive does spin up, however.
I can now plug my Logitech Unifying Receiver into the side of the Apple keyboard, and both the mouse (MX Master 2S) and keyboard work together perfectly in tandem. This is a big improvement as before, the side ports didn't work.
The scanner (CanoScan n1220u) now makes noises. After plugging in, I can try to load the scanning software and the scanner tries to initialise (the carriage moves). However, the message that the scanner could not be found pops up, and that's the end of the show. Good news is that I can unplug the scanner and plug something else back in, whereas previously the scanner would hang up the USB bus completely.
The card reader still does not seem to work, it's detected as a device but it will not mount my CF card. However, as with the scanner, it also no longer hangs up the bus as it did before.
Plugging in a USB 3.0 External HDD (An OWC Mercury OTG with 1.5GB SATA HDD) causes a sudden restart of the system. Just before restart, I see that the volume changes (with an indicator on-screen like you'd see if you pushed up or down on the volume of a PowerBook, and an alert sound). The drive does spin up, however.
Last edited:
croissantking
Well-known member
I've ordered that LCR-T4 component tester and I'll be going over all my caps to check their values, as some of them might be a little off.
What do you guys think?
What do you guys think?
croissantking
Well-known member
Tried another USB hard drive (an old Seagate control board with a WD drive I have laying about) and it works great copying files both ways under 9.2.2 and 10.2.8. Sometimes, like 1/3rd of the time, it causes a sudden restart when plugging in. Maybe it's drawing too much power.
Similar threads
