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Hi Paul, one more thing... Is it necessary to have this code in the project: #include <WireIMXRT.h> #include <WireKinetis.h> Thanks

Hi Paul, Thanks for the response - When I try a second Teensy that I have here, I get the correct waveform. Trying to determine why the first unit was giving me problems yesterday..... Thanks again!

Hi All, First time playing with i2c on a Teensy4.1, but I have done is a bunch with other controllers. I load the code below, but I see nothing on my oscilloscope on pins 16, 17, 18, & 19. All 4 pins just sit at 3.3V. No clock, no data, nothing. Any ideas? Thanks! #include <Wire.h>...

Hi skylarl, Please send me a direct message - hopefully I can help. Not to many years ago I finished Electrical Engineering at UofM.

Quasi Solution! Hi All, I did what mark said, and I tied the LIN line to two UART channels, Teensy Ch2 and Teensy Ch6. I configured Ch6 to detect the LIN break, and left Ch2 to accept the data. Sure enough, Ch6 detects the LIN break and Ch2 can pull in the data. Only issue is that, Ch2...

Hi Mark, I was thinking about doing exactly what you are saying - however I have to imagine that there's a way to get the LIN functionality to behave on a single channel. I am going to keep plugging away here...

Progress Hi Everyone, I am able to detect the Break Pulse! - However when I do this, I am unable to read the incoming data bytes. Serial2.available() always returns zero. When I go into the i.MX RT documentation, I see that by enabling Break detection, the data buffer packing is disabled...

Hi All, Has anyone been able to detect a LIN bus break pulse? I am trying to build a LIN bus sniffer and would like to actually detect the 13 dominant (low) bits that indicate Start-Of-Frame. Thanks!

Hi Markus, Haha, wow I am dense.... have you any experience with detecting the LIN break? I have tried a lot of things but cannot successfully detect the break.

Hi Markus, Is the LIN library you have on Github capable of detecting a LIN break? I see in your source files that the break length selection is available, however no where in the library do I see where the break is detected, to trigger the Start of LIN Frame. Thank You

@defragster - you are correct about updating t1 - the code I posted here is a snippet of my actual (large) project. In my main project, I have void loop() { t1 = millis(); Are you saying the Serial2 will take over functionality of the IRQ_LPUART4? I am not exactly following.... In the...

Hello all, I have been working on LIN implementations on Teensy4.1, basing most everything I do from the LIN libraries from Markus Lange https://github.com/MarkusLange/Teensy_3.x_4.x_and_LC_LIN_Master What I am trying to do is trigger an interrupt when the Break field of the LIN bus is...

Thank You Paul, As always, something simple that I just overlook..... Thanks Again!

Hi BriComp, I just use the example (Cardinfo.ino) from the example list in the Arduino IDE /* SD card test This example shows how use the utility libraries on which the' SD library is based in order to get info about your SD card. Very useful for testing a card when you're not sure...

Hi All, Using my Teensy4.1, I have opened the Example project Cardinfo.ino. I upload this project to the board with a MicroSD card inserted (8GB), and I get this error message in the serial window: I also tried using a 32GB microSD card and the same problem occurred. I am connected to the...

Hi Manitou, Firstly - I based my code directly on your examples, so thank you for that! Second - I need to adjust the high and low times, for each cycle. I am creating a specific digital signal, not just a PWM with a given frequency & Duty-Cycle. Otherwise I'd do exactly what you've posted...

Hello Everyone, In my project, I use Quad Timer (TMR4_CH2) to count up to a value (TMR4_COMP12) and then trigger an interrupt. In the interrupt, I create a PWM signal. I am successful in doing so, however I still have questions regarding some of the registers. My (working) code is below, it...

Hello KurtE, Thank You!

Hi All, I am using Quad Timers to measure an external PWM signal and I was wondering if anyone could tell me the difference between attaching a Interrupt Service routine using void setup() { attachInterrupt(digitalPinToInterrupt(11), ISR_TMR1_CH2, FALLING); } or using...

Thanks Manitou!

Hi All, I found a way to reset the counter, but it's kind of dirty... In the iMXRT1060 document, it says that if you set GPT1_OCR1 to a new value, it will reset GPT1_CNT. So within my ISR, I just set GPT1_OCR1 to an arbitrary high value (0x1FFFFFFF). No need for the value to change, any...

Hi All, Does anyone know how to reset the General Purpose Timer Counter registers? For example, within an interrupt, I want to read the value of GPT1_CNT, and then reset GPT1_CNT to zero. This is def possible with FlexTimers and others, however I cannot determine how to do this with General...

Hi Paul & Joe, It only occurs on the first build of the program, for example, when I first open the project and build for the first time. After that, all the .o files are generated and it takes about 40-45 seconds to compile. I am behind a corporate firewall/antivirus so it is possible that...

Hi DroneOverLord & Everyone else, I have to apologize, I am not the sharpest tool in the shed... I plugged the ethernet cable from my Teensy4.1 to an ethernet switch and Ta-Da! the system initializes, etc. It gets passed Ethernet.begin().

Hi Drone, Without having an ethernet cable plugged into anything, I use the teensyMAC function. I can see over serial bus that the teensyMAC function changes the values of my MAC address. Then I call Ethernet.begin(MAC,IP) and the CPU still gets hung up. If you could try tonight, could you...

I saw your comment, thanks! I've replied to your reply there too!

Hi DroneOverLord, Thanks for your response, I'll try the MAC address route. I assume this function below would also retrieve the MAC address too. Do you know... can I run this ethernet kit without a ethernet cable connected? Does the kit need to be connected to a valid ethernet server or...

Hi DroneOverLord, I also cannot get the NativeEthernet to work on Teensy4.1 - I have tried many things and nothing seems to work. I have tracked down where the system gets bogged down though, please look at my thread from today...

Another Update: Within NativeEthernet.cpp, I added a bunch of Serial.println() comments to debug where my program was getting hung up. I found it to be in the function void EthernetClass::begin(uint8_t *mac, IPAddress ip, IPAddress dns, IPAddress gateway, IPAddress subnet) The very last...

Quick update - in the previous post above, I was using the Ethernet libraries, and not the NativeEthernet. So Now I have attempted to use NativeEthernet examples as my starting point and the processor gets hung up at the line Ethernet.begin(mac,IP_Addr); You'll see in my code below that I...

Hello All, Has anyone else experienced horrendously long compile times when using NativeEthernet.h? I first started with a Hello-World type project, just blink an LED. The initial compile time was a bit long, but subsequent compile times were the normal 45 seconds. Then, the only change I...

Yes, I'll dig something up if I can find the drawings.

Hi All, Recently I hooked up an ethernet kit for my Teensy4.1. I soldered everything in and loaded up the example file UDPSendReceiveString.ino. When I start the program, I get the message (in the serial window): Ethernet shield was not found. Sorry, can't run without hardware. :( So now...

Hello all, Using Teensy4.1 here. A lot to go thru here so I'll break it down in sections. Overview I am trying to do something "simple" and create a PWM from a QuadTimer, specifically TMR1_Ch2. I am simply trying to have TMR1_CNTR2 count up to TMR1_COMP12, then enter a service routine where...

Hi CollinK, It seems the MCP2562FD is the way to go, except you're correct, they are not in good supply! So I did a no/no yesterday, and connected up the SN65HVD266 (5V) direct to the CAN1 Tx/Rx of the Teensy4.1, and it worked! To be safe however, I installed a voltage divider circuit on the...

Figured it out Of course as soon as I press SUBMIT, I try something that actually works... For the SN65HVD266, one must apply 5.0V to the Vrxd pin (pin 5). This works at least when working at 5.0V levels. Still trying to figure out 3.3V.... If anyone has a good 3.3V CAN-FD transceiver out...

Hello All, I am trying to move to a CAN-FD transceiver for my Teensy4.1 - I already use the SN65HVD230 for CAN2.0 applications just fine. I can read/write messages from the Teensy4.1 without any problems. When I disconnect the Tx and Rx lines from the Teensy, the SN65HVD230 still sends out...

Hi All, I got it all working. I forgot that you needed a functioning transceiver properly connected, before the µC would actually send out packaged CAN data. Thank You!

Hi Tonton81, I have an external CAN tool that I use to read CAN bus, terminated properly with selectable 120Ω or 60Ω (or none). My PC is running the software that controls this external CAN tool. Hi cgeber24, I thought I had left a reply below my initial comment, it appears that it did...

Hi All, Working with a Teensy 4.1, I have done a multitude of CAN projects with Arduino Uno and Arduino Due in the past. I am trying to get a Hello-World project up and running for CAN bus, however I am not getting any tangible output. Before I try any CAN-FD, I wanted to make sure I could...

Hi All, I am looking to execute an input capture event on the falling edge of an external signal. I start with Manitou48's example here: https://github.com/manitou48/teensy4/blob/master/qtmr_capture.ino With regards to Manitou's code, can anyone explain what the code on line 40 does...

defragster - Thank You!

Hi Manitou, I actually made my variable volatile before I added __asm volatile ("dsb");, and that alone did not solve my problem. I will try it again to be sure (I tried about 100 combinations of things) but as I recall, making the variable volatile does not by-itself prevent the double-tap...

defragster, I was wondering about __asm volatile ("dsb"); Adding that line of code to the end of the ISR works great! Thank You!

Update: Surprisingly.... when I put a Serial.print() call within the ISR, the output incrementing of ISR_Cnt is correct. I have no clue why this is occuring, investigating now and will update ASAP. This increments correctly: void Dimitri_ISR() { GPT2_SR = 0x3F; Serial.print("ISR \t")...

Slow Counter Mis-Incrementing Hi Manitou, Thank you for the response, I found right after I posted that when adjust my ISR as such: inline void Test_ISR() { GPT2_SR = 0x3F; ISR_Cnt = ISR_Cnt + 1; } Then I get the ISR to behave. I did not initially realize at first that I had to clear...

Hello All, I am trying to generate a simple counter, using GPT2 timer and an interrupt. Currently, when GPT2_CNT reaches the Output Compare Value (GPT2_OCR1), the program stops executing. Within my ISR, I only increment a counter value. My Code for GPT2 Timer: /* * Teensy 4.1 General...

Thanks Luni, This works! I was wondering about that activation, based on what I saw in imxrt.h. It would be interesting to see why GPT1 is already initialized! Thanks again!

Hello all, First time posting on Teensy Forum... I recently purchased Teensy4.1 and I am trying to view the General Purpose Timer registers. I have no problem viewing GPT1 registers, however when I try to view GPT2 regs, the system gets caught up in an infinite loop. The board LED will not...