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Well, I know it is a niche, but I'd really like to get all 16 QUAD timers on 16 pins ...

Sent you a PM re: dissertation. Did you successfully convert it? Thanks!

For (my own) future reference, also found this thread w/ @KurtE

https://forum.pjrc.com/threads/57894-Teensyduino-1-48-Beta-3?p=220131&viewfull=1#post220131

Related: the Future 1170 thread is also closed for the duration "until after Teensy 4.1 ships"

https://forum.pjrc.com/threads/57842-Future-Teensy-features-amp-pinout?p=233257&viewfull=1#post233257...

Thread's closed, but I must be misreading this post:

"These are all the unconnected pins on Teensy 4.0 which could become available:
[..]
B0_06 A8 QTIMER3_TIMER0
B0_07 A9 ...

What if you want three connections, placing the Teensy 3.6 in the middle between a USB device and a USB Host, with a 3rd connection to a PC. Is there enough onboard USB on the 3.6 to address all...

Would it be possible to do PulsePosition input capture on eFlexPWM as well?



You mean the NXP reference manual (non-login version) ?
...

The card does not list QTM, is Beta2 identical to final T4?



10 B0_00 2.0 4:CS0 QT1_0 MQS_RIGHT 2:0
11 B0_02 2.2 ...

Maybe I don't know how to read it, but it does not appear to list/track the FlexTimer Module pins?

https://www.pjrc.com/teensy/td_libs_PulsePosition.html

I am trying to figure out what the...

Only pinout overview I found calling out Quad Timers:

https://forum.pjrc.com/attachment.php?attachmentid=15040&d=1540676635

Implies 9 concurrent inputs.

From the various beta threads:

* https://github.com/PaulStoffregen/FreqCount T4 updates
* https://github.com/manitou48/teensy4 qtmr_ experiment sketches

I lost track on pinout...

QTIMER (output) tests: https://forum.pjrc.com/threads/54711-Teensy-4-0-First-Beta-Test/page151

output 150MHz at pin 19 ...

T4 version of Flex Timer Module called QTIMER

From:
https://forum.pjrc.com/threads/52761-Teensy-4-0-(hypothetical)-pin-assignments?highlight=QTIMER

I'll add what I find (eventually find out) here. One way to phrase my question:

What's the expected/hoped for spec for Pulse Position (QTimer equivalernt) on Teensy 4?
How many pins, which, what...

Teensy 4 FlexTimer Module (FTM) / Quad Timer (QTIMER) Input Capture capabilities

Just in case somebody has already dug out relevant specs:

I am using Teensy 3.x for FTM input capture, targeting...

OK, maybe I2C to a PIC32 then? Something like

https://dorkbotpdx.org/blog/wbowers9000/multi_board_madness

but with 3.x and more details?

Is there an equivalent for the PIC CTMU on the Teensy?

I am not looking to capacitive touch, but a timer for distance measurement.
See page 5 figure 5 here:
...

Thanks - if you don't expect to to have 24-pin versions anytime soon, the suggestion to cut 14-pin down to 10-pin is a sensible one.

This page

https://www.pjrc.com/store/header_14x1_d.html

confuses me. Title says 5 pins, order button legend says 5 pins, image shows 14 pins, which also makes sense.

These would work for...

I am trying to find a good solution to connect several - possibly a dozen - Teensy nodes to a PC host.
The simplest approach would be to just connect them wired, to a USB hub, and run both power and...

Thanks Michael, those are really useful links for mock-ups and prototypes - I can ignore extra width for now, or maybe even cut it off once or twice.
Sort of like this, though cutting might be...

The Tindie part is just the chip, so I am looking at these in earnest:

https://www.ebay.com/itm/LSM303C-3-Axis-6DOF-Accelerometer-Magnetometer-Sensor-Module-for-Arduino-H1Z7/273132674862
...

Thanks - I might not even need feature creep, because the LC might be running all out if I actually use the max of 6 sensors (42mA) it can serve. Each sensor needs at least one FlexTimer Module...

There's the LSM303, for which breakout boards exist, but they aren't any cheaper. I was hoping for $5-$10, not $15+.

Edit: eBay provides. I needed to start looking for eCompass etc., not 6DoF.
...

Did, but not closely enough. It's 9 DoF. I thought it was an IMU, but the gyro is separate.

So the FXOS8700CQ would be an option
https://www.pjrc.com/store/fxos8700cq.pdf

and I already...

I want to determine orientation at rest, using an accelerometer with high resolution and small range.
Need only +/- 1G.
But I also want to measure the magnetic field vector.

Do I have to go for...

I want to power 1-8 sensors from the Teensy 3V3.

The 3.5 and 3.6 "welcome" cards say 250mA for 3V3 max. I don't have a card for the LC - is it the same?

Is that regardless of how hard the...

Is there a perfboard that has the same width as a Teensy and fits on it?
Anybody know of e.g. an OSH perfboard-style "shield" made for Teensy I could mod or use as-is?

In broad strokes, I am looking to prototype a Teensy-based solution for 48/60 MHz data acquisition from 1-6/8 infrared sensors using FTM, using Teensy LC and/or Teensy 3.6.

Something using a...

I think I found the solution - it occured to me that the FTM calls are currently made in this order:



*portConfigRegister(pin) = PORT_PCR_MUX(4);
CSC_CHANGE(ftm, cscEdge);


If ALT4 does...

I can post source of the exact sequence of Teensy API calls for GPIO and InputCapture, but w/o the hardware it's not much of a repro.

I can phrase my question like this: what I observe is that:
...

I also tried INPUT_PULLUP at the end of the final GPIO read verifying the state transition, same issue.

If I read this right, the internal pullups ensure that disconnected pins are guaranteed...

Somebody kindly suggested I should consider the built-in pull-up resistor to ensure that my E pin, configured as input, does not get drawn to LOW - assuming that's what happens when setting ALT4.
...

Thanks a bunch for the references, Paul. I think I understand the InputCapture setup, but I am not sure this covers the problem I am observing.

First, I have to generate a bunch of once-off pulse...

Preamble:

I understand this will take a while for me to sort out.

At this point the guidance I could really use is somebody who understands the Teensy/FTM hardware constraints to tell me "this...

I had hoped to use PPM as-is, and I am not through doing due diligence on it, but I started a thread here:
https://forum.pjrc.com/threads/51727-Question-about-PulsePosition-for-same-pin-I-O

I...

This:

//#define I2C_F_DIV28 ((uint8_t)0x08)
...
//#define I2C_F_DIV1536 ((uint8_t)0x39)
https://github.com/PaulStoffregen/cores/blob/master/teensy3/kinetis.h

The usual caveats - as in...

I would much appreciate a clarification on this - is 48MHz the best this can do (including more recent e.g. Teensy 3.6)? Is it possible to run at 96MHz and sample PP at 48MHz?

How did you get this...

Sanity check needed regarding a possible PulsePosition modification.

I am trying to capture data at 48MHz, similar to what was done here:

https://trmm.net/Lighthouse...