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great thanks for clarifying. And it's working fine ... !

I'm following the instructions on the Teensyduino 1.59 page for installing in Linux. The IDE2.3.6 is running fine. So far I have : - added the json link - installed the udev rules. - installed TD in the Boards Manager My simple question regards this line: 4) Download the corresponding...

FWIW after all the hassle the solution was simply to upgrade the microSD cards to better quality / name products.

excellent info as usual on PJRC, thanks Paul.

The basic sketch below is for one of my Adafruit RFM95W Lora modules that I am trying to control with Teensy 4.1 It relies on this Lora library by Sandeep Mistry that is available via the IDE library manager. The sketch compiles with warnings but doesn't work yet. The warnings are about...

I'm using all standard MM Main Double board + Teensy + ZED-F9P + ESP32 wiFi. Fortunately I have two identical setups, and I will swap things around (soon) as suggested by defragster to eliminate any hardware faults, although I'm distracted on another project for now. I will also try a better...

I even took it down to 8MHz and still doesn't behave. Is there an ideal SPI frequency ? It behaves as if logfile.close(); doesn't completely close the file, leaving the SD in an undefined hardware state, so when next I hit reset it doesn't initialise at boot 2nd time around and onwards

I have two identical Micromod assemblies (#1) and (#2). I tested on (#2) using the sketch above at 20MHz and it worked reliably (hence my "Cancel" above). But not so fast ... I did not get same reliability on assembly (#1). It will start and run properly once, but if I restart using RESET...

Cancel :-) I just saw the comment "maximum. Reduce if errors" against #define SPI_CLOCK SD_SCK_MHZ(50)" So I reduced it to 20MHz and the problem no longer happens (doh!)

I'm using a Sparkfun Micromod Teeny Processor on their Micromod Main Double board, that includes a microSD slot. The Teensy interfaces with the microSD over SPI #2 The sketch below simply opens a file on the SD, writes a couple of lines, then closes the file. It runs fine but only once. If I...

Very interesting @AndyA. I started with simple byte by byte forwarding from the ESP32 into Serial2 on Teensy, and again on the Teensy Serial1 to the ZED-F9P. This sort of worked but was unreliable and the RTK lock would drop out a lot of the time. So I added buffering, parsing and CRC checking...

FWIW these instruction worked like a charm: #define RX_BUFFER_SIZE 1024 // expanded ESP serial incoming buffer #define TX_BUFFER_SIZE 1024 // expanded ZED serial outgoing buffer unsigned char RX_buffer[RX_BUFFER_SIZE]; unsigned char TX_buffer[TX_BUFFER_SIZE]...

OK I'll have to give them a try ... hopefully there's a good example of how to use them properly

I did read about them. But addMemoryForRead() &r addMemoryForWrite() seem to use ordinary memory for the extra buffer, is using either (or both) really any better then adding buffer(s) myself, in my code ?

My hardware: Sparkfun Main Double board, fitted with: Processor board : Micromod Teensy Function board 0: Micromod ZED-F9P GNSS Function board 1: Micromod ESP-32 WiFi/Bluetooth My recent interest has been developing a reliable feed of an RTCM3 correction data to the ZED-F9P, so it can maintain...

Thanks KurtE, I found that .arduino15 folder and it's contents looks very familar. I also found .arduinoIDE folder next to it with these contents: I'd never noticed but I now see that is present in Windows too at C:\Users\xx\.arduinoIDE I wonder: What is the Windows equivalent ot the Linux...

Wikipedia does a good job explaining the history of Unix it was one of the first comprehensive operating system for computers, and the fore-runner for DOS, Windows, Linux So not a small compact RTOS, the real-deal So the notion that it can run on a T3.5 is ... astonishing !

With the supposed end of support for Windows 10 (and being violently incompatible with, and allergic to, Windows 11) I bit the bullet and purchased a new Ubuntu laptop a few weeks ago. I'm still green in Linux, although it's proving pretty easy so far ... I have been using IDE 2.3.4 OK, it...

Thanks. I see only HardwareSerial2.cpp and HardwareSerial4.cpp have the MICROMOD distinction, and basically they say: Serial4 pins for T4.1 (16,17) become Serial2 on Micromod Serial2 pins for T4.1 ( 7 , 8) become Serial4 on Micromod That Hardware Serial Ports ref table could do with a...

On a standard T4.1 pins 16/17 = A2/A3 = Rx4/Tx4 = Serial4 For the Micromod teensy I think the same pins 16/17 might be Serial2 but I need to be absolutely sure, so I went looking for clues in ...\AppData\Local\Arduino15\packages\teensy\hardware\avr\1.59.0\cores\teensy4 but quickly got lost in...

Ahah, OK thanks. Basically the sketch uses a generator with a limited selection of set frequencies. If instead I use an external pulse generator as the input source I expect FreqCount will report correclly. I must give that a go ... thanks!

I've been playing with the Serial_Output_T4 example sketch in the FreqCount library, on a T4.1 As provided the sketch reports exxactly 50MHz on pin 9, as expected. However other frequency values don't give expected results Requesting 40MHz reports 37.5 MHz Requesting 10MHz reports 10 MHz...

digitalWriteFast() works nicely, tks

ignore that 4.1 - just me being slack I have all your pinout spreadsheets kurtE, in fact they were the only reference with the link to digital pin 40. Curious: where did you source that info? Good idea, thanks jmarsh. I assume you're suggesting like this? I'll give it a go .. #define...

I'm working on reset control from my T4.1 processor to the ZED-F9P GNSS chip on my Micromod system comprising: MMod Main Double Board with: Processor: T4.1 F0: ZED-F9P GNSS F1: ESP32-WROOM-32 WiFi/Bluetooth But I'm having trouble getting it to work. AFAIK this is the connection path: T4.1 MM...

I've been reading up how use my Sparkfun Micromod ESP32 Wifi/Bluetooth module with the ESP32-WROOM-32E chip. I need to set up a Bluetooth link to get (RTK) data from my Android mobile, and I think I have to customise the firmware to do this. From what I've read I need to use the ESP-IDF tool,as...

Doh! Of course it's SCK. Many thanks FWIW I should have mnentioned: When I previously ran the code above on my stock T4.1 the LED flashes work fine, since it uses SDIO AFAIK there such pins aren't broken out on the Micromod boards, so not so easy. I could maybe do something over I2C? It's not...

Thanks muchly @AndyA, you're suggestions made me take another deep dive into all the lists/schematics again and confirmed your points. The numbering and labelling is all a bit of a nightmare but below is my detailed summary for the serial connection path to a Sparkfun ESP32-WROOM-32 board in F1...

I asked this question on Sparkfun forum several weeks ago, with no response as yet : I have a MM Main Double board, with Teensy 4.1, ZED-F9P GNSS Function board (in F0 slot) and ESP32-WROOM Function Board (in F1). After studying all the schematics and pin-out it seems there is no Serial...

When I run this sketch the LED blinks twice during setup, but doesn't flash in loop(). However, if I comment out the if-else SD initialisation, the LED flashes as expected. Looks like an issue for SdFat lib, but I don't know where to look? #include "Streaming.h" #include "SdFat.h" #ifdef...

Those instructions are a bit out of date, for a T3.2 not T4.1 which has 2 pads (yes one is VIN, the other VUSB) Why not just cut betwen the pads, so VIN anf VUSB are no longer connected? And it's quite easy to reverse if need be, with a solder blob. Fitting diodes to the pads would not be...

I see they're #defined in cores\teensy4\imxrt.h altho it doesn't provide any detail beyond the manual. I think the manual is the ultimate resource.

Thanks for the good info, will give it a serious go later. I see low level terms like IOMUXC_GPT2_IPP_IND_CAPIN1_SELECT_INPUT are listed in the 1060 Reference Manual. Question: Is that document the main/only resource for details on such terms?

Have you read this: Teensy 4 Power ?

.. I assume you mean: write some low-level code?

The overview description of the GPT timer module in the I.MX RT1060 Reference Manual includes this: AFAIK the TTT doesn't support this, but is there a way to hook an attachInterrupt() pin sequence into TTT ? Or IntervalTimer ? Suggestions appreciated ...

Success. I downloaded your latest from GitHub, and the PIT now runs at expected frequency, without any compensation factor required. thank you :-)

That happens occassionally with IDE 2 even if \scr is not in use.

Sure, but how can I get hold of 1.4.3? Library Manager only offers 1.4.1 Same on GitHub AFAIK, although TBF I'm not that familiar with GitHub workings

A long shot but it may be caused by electromagnetic interference from the engine. Try shielding the teensy from the motor by surrounding it with tin foil with as few air gaps as possible (i.e. a faraday cage). Ideally connect the foil to ground as well, but in one place only.

Before you appled external power to VIN did you cut the join between VIN+VUSB (on the back of the teensy, near VIN pin) ? Did these boards work in the past? (BTW the link in your post is to the schematic for Teensy 4.1 not 3.6, although they are similar in this regard, i've attached T3.5/3.6...

Thanks Joe, happy with that. I will definitely look into PWM / FlexPWM later. Meanwhile I believe I've stumbled on an inconsistency in the way the library handles the PIT timer. With USE_GPT_PIT_150MHz = false and the timer set up with "period", or "semi_cycle" (s) for a toggled output, the...

hi luni, I've spent quite some days/hours reading much of this thread and your excellent wiki, then fiddling with various timer sketches to get to grips with how it all fits together. I'm in awe at how comprehensive the library & documentation are, much appreciated. This thread is a top example...

I have been doing this for some time, but without the src sub directory. It requires some discipline / care with includes and externs, but I've found it much easier to maintain stuff, and results in a set of code "modules" (.cpp/.h pairs) that are easily re-usable in other sketches. Curious...

I'd nearly finished a large post yesterday and then I had to leave suddenly. I had to shutdown, so I saved the draft. But I can't find it today (on a different computer). Does the "save draft" option preserve over logins?

... spilt beer = my greatest fear! What a relief :-) :-)

Based on all your responses it seems none of you are experiencing the inconsistencies / symptoms I've explained in post #10, right? I ask because I'm surprised many others haven't experinced the same issues, given I'm just using the standard IDE+TD on Windows Teensy port, always. More than one...

Interesting. I'm not keen to subscribe for AI, but I do refer to free Google Gemini and ChatGPT for C++ / Arduino code questions, either general or specific. They're not too bad, definitely useful. But not a whole sketch ...

you must have missed it, post #10 line 3 I would have thought it was clear I understand this from what I wrote. Of course the program button is not a reset. However I do think it's reasonable to think of the ON/OFF input as a reset function, albeit with a 4 sec delay. It really doesn't matter...

... ouch :-)