Gemma Bootloading Problems

[davethewalker]

Hi all,

I've been having untold trouble with both Gemma and Trinket, with intermittent operation and downright refusal to connect properly.

In the end, I ran the latest libUSB .inf creator and discovered that the boards weren't enumerating properly with the USB, but that I had quite a lot of USB peripherals connected (mouse (appearing several times in the USB list), keyboard, etc..) as I run my laptop in a docking station. When I unplugged these USB devices, LO AND BEHOLD, the boards appeared and the drivers installed properly!

It's now repeatable. If my mouse & keyboard is plugged in, it won't work. If I unplug them, it's fine.

I strongly recommend anyone having difficulties tries this out! It could have saved me a few hours of faultfinding if I'd known in advance...

Hope that helps,
Dave

[adafruit_support_mike]

What OS are you using?

[davethewalker]

Sorry, should have said.

Windows 7

[adafruit_support_mike]

You might try connecting the Trinket/Gemma through a USB hub. Some people who've had trouble making a direct connection work can get good transfers every time with a hub acting as the intermediary.

Our theory is that USB hubs have a chip that reads and transfers the signals. The chips are made to be compatible with the USB stacks from most/all major OSes, but seem to be a bit more tolerant when communicating with client devices.

[EvelinRim]

Hi Guys.

I am going crazy here, just can't make this Gemma to work! I've read all this thread, tried everything that was written here, spent all day and it still doesnt work. I have Windows 7 and I keep getting this message ''avrdude: Error: Could not find USBtiny device (0x1781/0xc9f)''. I am newbie at Arduino, and now regretting that I did not purchase flora instead.

When I plug it in to new usb port, I get this, is this what's causing the problem?



I tried installing the drivers from here: https://learn.adafruit.com/introducing- ... bootloader but the install just does not work, black screen opens similar to SMD and disappears after few seconds, and no further actions. Please help =/

Eve

[adafruit_support_rick]

What happened when you manually installed the USBtinyISP device driver? Did you get an error?

What do you see in Device Manger? Where does the Trinket/Gemma show up?

[EvelinRim]

Ah, such a silly mistake, I figured it out, once I went to the device manager =D
I dont get that message anymore, and it seems all fine now, BUT is there any place where I can find other sketches for gemma? Or do I have to learn and write it myself?

[adafruit_support_rick]

We have lots of projects on the learning system:
https://learn.adafruit.com/search?q=gemma

[DuncanW]

I got the Gemma a couple of days ago, i downloaded the fast installation and i got the program up and running just fine. When i pasted the "blink" program into Arduino 1.5 and pressed the verify button it said it was working just fine. But when i plug in the Gemma, hit the button on it and then press the upload button all i get is
Error: Could not find USBtiny device (0x1781/0xc9f)
and i cant figure out why im getting this

[adafruit_support_rick]

Are you running Windows? Did you install the USBtinyISP driver?

[DuncanW]

Yes i am running windows 7, and how would i know for sure if i installed the USBtinyISP

[adafruit_support_rick]

Look in Device Manager. If you've installed the driver correctly, the Gemma will appear as "USBtinyISP Avr Programmer" under "LibUSB-Win32 Devices".

[DuncanW]

so i tried to install it but when i tried to nothing is happening like in the tutorial. it says that the wizard window is supposed to pop up but all i get is the black command box showing up on the screen and disappearing instantly and nothing else happens.

[adafruit_support_rick]

Does the Gemma show up anywhere in Device Manager? Under "Unknown Devices", perhaps?

[DuncanW]

When i plug the Gemma in and open device manager it appears under "other devices" and its called "trinket" and has the yellow "!" triangle