Coming Soon: Teensy-LC (low cost Teensy)

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christoph said:
Huh? I understand that SPI0_C3 doesn't exist, but the register before that is SPI0_CI (clear interrupt reg) and that should certainly exist.
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The CI register doesn't exist on SPI0. Those interrupt conditions are all associated with the FIFO feature.

In standard buffer mode, the SPI0_S register has the interrupt flag. CI doesn't exist, because only 2 types of events can trigger an interrupt without the FIFO.

But in either mode, SPI interrupts are pretty much worthless, unless you're using a very slow bitrate. DMA looks like it could be quite useful, but for DMA usage you'd get the interrupt from the DMA controller, not the SPI.
 
Can any of the product testers enlighten me as to what the two circular pads above pins 1&2 on the bottom side of board are connected to?
7mVJU1p.jpg
 
Those are test points, which we use while testing the board and programming the bootloader.

Here's a page I wrote a couple years ago, about the test fixture for Teensy 3.0.

https://www.kickstarter.com/project...rm-cortex-m4-usable-in-arduino-a/posts/305527

As you can see in the photos, several extra test pins are located in the center, which touch similar pads on the bottom side of Teensy 3.0. For Teensy-LC, we've made a very similar test fixture. Because Teensy-LC is a simpler board, only 2 special test pads are needed.
 
Here's a photo of the tester for Teensy-LC. :)

lctester.jpg
(click for full size)

If you look closely, you can probably see a 3rd test point close to pin 0 was originally planned. It turned out to not be necessary.
 
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Are those pogo pins hand soldered or reflowed? So clean.

Also, how often does the Red LED light? I'm assuming the failure rate is quite low.
 
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Interesting Paul those pogo pins. I just ordered a bunch some weeks ago to do the opposite. Soldering them to a Teensy and then use them to test the boards that I will mount the Teensies on.

Found out that DX.com has them for a crazy low price b.t.w.
 
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Got Robin's email and started looking up about this part. Have been busy figuring out the one path for resource allocation to add position latching with my Teensy 3.1's and not doing much Forum monitoring.

Got a hold of the Freescale documentation and read:

All TPM modules in the
device are configured only as basic TPM function, do not support quadrature decoder
function,
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Looks like I will have to add 'Teensy 3.x Only' to my code. :(

TLB
 
Hey there,

I woke up this morning and I found Robin's email.

I really thank you for considering me as part of this beta testing; I'm probably late, but I can wait for the green boards; I wouldn't have the time to thoroughly test the beta so I won't be of much help with early beta testing, but I really cannot wait to test the new Teensy LC with a project I'm currently working on, those 8 PWM outputs look very promising for what I have in mind!

And, dude, the cost of the LC is crazy.

Again, thank you very much, I can't wait to test this baby :D
 
tlb said:
Looks like I will have to add 'Teensy 3.x Only' to my code. :(
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Yeah, many of the other peripherals also have only their basic functions.

Really, it's pretty amazing how many special and really nice extra features are packed into Teensy 3.1's peripherals!
 
The final green boards with gold plating just arrived. Erin is hand soldering right now! We'll be sending all the rest of the early boards over the next week (Feb 16-20).
 
For the fun of it, I started trying to figure out which Teensy Arduino pins connect to which pins on the underlying processor as to get an idea if there are possibilities for using different pins for some things. Example if I wish to use SPI1 and USART0 which by the cheat sheet both use Pins 0 and 1.

So hopefully figuring out the pin mapping:
(B16, B17, D0, ...) and using the pin mapping table in the PDF, I think we have:
Teensy-LC---Pin-out.jpg
Note: It took me awhile to import text of pdf to excel so very possibly I have some data slightly off.
But if this is correct, it does look like UART0 could go to pins 3,4
And it looks like at least parts of SPI1 can be remapped as well.

Probably should just experiment.

Kurt

Edit: Card should also show that the CS0 on pin 6 is for SPI1
 
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I was still playing around with my Excel document for how Teensy pins map, to see Alternatives if I have two things I want that by default are on the same pin.
Teensy-LC---Pin-out.jpg

I started to play with marking PWM ones on the chart, which are probably the TPMn_n like values. (should verify again in manual), I got up to where
Teeny LC pin 21 is parked as PWM on the cheat sheet, but not sure it maps?
I believe is the processor pin D6, which I think is on pin 47 of the QFN48 chip and I don't see anything... ?
 
Robin, if you have any Teensies hand soldered I would be happy to help testing. Ordered 4 last week already (apart from the 3.1).
 
Robin said:
No. The initial round of Teensy-LC boards have been hand soldered so that test can happen before the production run is complete.
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Ah, I was wondering since Paul said the final green boards was beeing soldered, so I thought they where final..
So if we pre-order now, we are going to get the ones from production when everything is done, right?
 
neslekkim said:
Ah, I was wondering since Paul said the final green boards was beeing soldered, so I thought they where final..
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This last round of hand soldered boards are using the final PCBs. The prior 2 rounds used prototypes we had made at OSH Park and Sunstone, so the PCB is physically different material.

All the early boards are hand soldered, which takes an enormous amount of manual labor. Erin has done most of it. I did a little on the first several. We're only building just enough for everyone on the list at the beginning of this thread. Everyone on that list has contributed greatly at some point within the last several months, answering questions or writing libraries or testing and giving really useful feedback on early beta software. Robin and I really wanted to do something special for everyone who's contributed so much.... so we got extra protos from OSH Park & Sunstone, and put the labor & shipping into getting the early boards made.

So if we pre-order now, we are going to get the ones from production when everything is done, right?
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Yes, absolutely. All pre-order boards will be from the normal production.

If you want one as soon as possible, definitely get a pre-order in. Those will all ship first.
 
What is written below may sound silly, but...

Whoa! I just discovered that I can track packages from you. Awesome. I just never tried it before, because the mail simply says "The customs bar code ID on your package is ...". But it's a USPS tracking number. So my LC is in germany already, waiting for someone to carry it to my door. Can't wait!
 
Sending Teensies to Europe always goes very well from PJRC is my experience indeed ;) didn't know about tracing either!

Will you happen to be at Embedded World Nürnberg next week christoph, a friend and I will go there on wednesday!
 
christoph said:
What is written below may sound silly, but...

Whoa! I just discovered that I can track packages from you. Awesome. I just never tried it before, because the mail simply says "The customs bar code ID on your package is ...". But it's a USPS tracking number. So my LC is in germany already, waiting for someone to carry it to my door. Can't wait!
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International tracking has improved quite a lot over the last year. Some countries better than others with tracking/delivery. It's good to hear Germany is on the list of countries with better tracking.
 
Isn't that on the USPS side Robin? I can also see my Teensies 3.1 have departed from the US yesterday. Will try to see if that also works within NL.

Update: nope, doesn't work in NL yet. Guess we should have just have stayed German territory after all in 1945 ;)
 
@jakorten no, don't think so. I'll have a fluid mechanics exam on tuesday, and during the next two weeks I'll have to see how 260 students tried to pass. Besides, my employer wouldn't pay for that trip.
 
Too bad :) So you are also a teacher or doing a course beside your job. I fortunately have no lectures to give on wednesday so take one of my former students with me. We have a startup and use Teensies a lot in our products (still in prototype stage but coming along, other students will be using it the next couple of months for research). We will use the LC too in a sensor module.
 
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