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Messages - tangrs

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TI-Nspire / Re: TI-Nspire USB serial breakout boards
« on: December 17, 2014, 09:29:16 pm »
I've set up a landing page so you guys can get some eye candy while we wait for the remaining parts and soldering stencil to come in :)

TI-Nspire / Re: TI-Nspire USB serial breakout boards
« on: December 12, 2014, 12:54:21 am »
Does anyone have any more information on how the USB host port works? I did manage to find this but there aren't any concrete values...

TI-Nspire / Re: TI-Nspire USB serial breakout boards
« on: December 08, 2014, 09:18:18 pm »
A little late but the final prototype looks like this:

In the end, I decided that a clamp type design would work best since it fits like a adapter/plug rather than a whole case (it also cuts down on 3d printing time, complexity and material).

I will also release the STL files and dimensions of the PCB board so people can print or modify the 3d printed case to their own likings.

TI-Nspire / Re: TI-Nspire USB serial breakout boards
« on: December 05, 2014, 08:03:44 am »
MiniUSB it is then :)

TI-Nspire / Re: TI-Nspire USB serial breakout boards
« on: December 05, 2014, 12:40:54 am »
Also, for the next version, do more of you prefer MicroUSB or MiniUSB?

TI-Nspire / Re: TI-Nspire USB serial breakout boards
« on: December 05, 2014, 12:33:38 am »
Wow that looks even nicer than the previous one now. I am curious about how much this would cost?

I still haven't worked out the details but a ballpark figure would be around AUD$35 (around USD$29.30) plus shipping. It'll be the board and a high quality 3D printed clamp (pre-assembled).

Version 1 should be available early January. I should have about 10 in stock but I'll get more manufactured if there's high demand. At the moment, I'm just waiting on a stencil to come so I can start bulk soldering efficiently.

After that, I'll start working on a second version with a USB host port and charging via the dock but this will take a while.

Also make sure to keep this maintained, because we never know if TI might perform slight changes on Nspire cases to make sure that this connector no longer fits. :P

For sure :)

TI-Nspire / Re: GDB debugging on HW?
« on: November 29, 2014, 08:28:10 am »

Is it better than nspire_emu's?

Depends on whether you like GDB better or the nspire_emu debugger better :)

Host or device stack? Host wouldn't be so interesting, as the BSD api is already working. Or does the device side also require enumeration?

It's a device stack.

TI-Nspire / Re: GDB debugging on HW?
« on: November 26, 2014, 05:26:09 pm »
It's definitely possible to debug the calculator through serial. GDB has built in support for attaching to serial.

I actually wrote an implementation of the GDB server protocol for one of my projects with breakpoint support and everything. I'll post it up if I find it.

Incidentally, the project I used this in was in writing a minimal USB stack for the TI-Nspire - the lesson learned: it's hard. If anyone wants the full source code of the project (it's pretty much dead now), I'll be glad to post it. The USB stack has enumeration working but no actual transfer of data.

TI-Nspire / Re: TI-Nspire USB serial breakout boards
« on: November 23, 2014, 06:30:19 am »
Just to clear up some misunderstandings, the dock connector has serial UART pins that can be used to get diagnostic information during boot up, in Ndless programs and Linux boot logs. This is a connector that slides into the dock connector and connects the pins to a USB-to-serial converter chip. I'm hoping it will be a replacement for some of the (admittedly very creative) home made dock connectors I've seen floating around.

From some of the feedback, I'll be also adding a possibility to break out the pads to normal header pins for GPIO hacking and adding a USB port for the second USB host pins too - though I may have to design these separately. However, I am not familiar with the possibility of powering the Nspire via the dock connector though. I will have to look in the hackspire documentation to see if this is a possibility.

The design is not finalised yet. I am trying to figure out a good way to clip these onto the calculator while also being compatible with all models.

TI-Nspire / TI-Nspire USB serial breakout boards
« on: November 22, 2014, 06:35:06 am »
Hey guys, it's tangrs.

Just want to announce something I've been working on over the past few weeks. It's a USB serial adapter that plugs right into the TI-Nspire dock connector.

The one shown in the pictures above is a very early prototype. The PCB is a hacked up home-made one (holy crap, DIY reflow soldering is a pain in the ass without solder mask) and the 3D printed bracket that goes with it is still in its early designs. The prototype works though :) I've already ordered some professionally made PCBs for the connector part.

So, my question to all of you guys, how many would be interested in buying one of these once I've got a decent design up and running? I'm deciding whether to mass produce a small batch of these once I'm finished with the design :)

TI-Nspire / Re: TI-Nspire CX dock connector breakout boards
« on: May 28, 2014, 08:20:20 am »
Stuffed up ? Do you mean the traces not being parallel to the borders ? :P

Nah, I submitted a mirrored design so everything was flipped and forgot to specify board thickness at order time. Oh well.

TI-Nspire / Re: TI-Nspire CX dock connector breakout boards
« on: May 28, 2014, 06:39:54 am »
Why, I had this idea yesterday ! :D I'm not going to get yours though because I'd like to learn PCB design stuff.

I also did this to learn PCB design XD

You can also tell it's my first time doing it since I stuffed up so much D:

TI-Nspire / Re: TI-Nspire CX dock connector breakout boards
« on: May 28, 2014, 05:29:34 am »
Selling stuff is OK :) The price is very generous I think so I'm sure you can at least sell 1 or 2 of them.

Cool, I was a bit edgy about posting this since a lot of forums ban this kind of stuff. The price is mainly to cover postage really..

TI-Nspire / TI-Nspire CX dock connector breakout boards
« on: May 28, 2014, 05:22:36 am »

I apologize in advance if selling stuff is against the rules of the forum.

I made a very, very basic design for a breakout board that's soldered to the CX model (old versions not supported, sorry!). Think modchip but for breaking out the dock connector.

I originally designed this just for myself but the PCB manufacturers sent me 6 extra boards. Unfortunately, they sent me boards thicker than I expected and mirrored my design :( Also, unless you solder some right angle pin headers, you won't be able to close the lid on the back of the calculator.

They're still usable if you do a bit of manual drilling work and a bit of extra patience when soldering. I'd rather see these boards be put to use than thrown away or chucked in the corner.

If anyone's interested, I'm willing to send the extra PCBs for AUD$5 postage (that's about EUR$3.40 or USD$4.60) to anywhere in the world. Add AUD$2 for the matching surface mount pin header but I only have 4 of these left. Please note that is is for advanced users who have de/soldering skills and is okay with opening up their TI-Nspire CX's.

I'll post some soldering/installation instructions if there are people interested.

TI-Nspire / Re: Calling all Linux Kernel developers!
« on: March 01, 2014, 07:33:47 am »
Sorry guys, still pushing the USB driver through to mainline for the device tree kernel.

Users who don't need cutting edge should probably stick to the old kernel for now.

The freezing at boot problem could be the result of turning on earlyprintk but selecting the wrong serial driver. Turning it off should solve the boot freezes.

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