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Your sketch does not transmit any CAN frame. You have not setup the mailbox correctly. Follow the example sketch : mailbox_filtering_example_with_interrupts.ino Can0.begin(); Can0.setBaudRate(250000); Can0.setMaxMB(NUM_TX_MAILBOXES + NUM_RX_MAILBOXES); for (int i = 0; i<NUM_RX_MAILBOXES...

The second sketch works. It can display the frames from can1 and can2. Check your wiring. Make sure you have two 120R terminator on each end of your CAN network. Using a scope, check you can see pulses on pin CRX2 of the Teensy.

Your second sketch works fine. I can see printf from can1 and can2 like this: CAN1 MB: 0 ID: 0x65 EXT: 0 LEN: 8 DATA: 85 52 66 50 50 86 87 89 TS: 869 CAN1 MB: 0 ID: 0x65 EXT: 0 LEN: 8 DATA: 85 52 66 50 50 86 87 89 TS: 30325 CAN1 MB: 0 ID: 0x65 EXT: 0 LEN: 8 DATA: 85 52 66 50 50 86...

Yes, you can use can3 in Classic CAN mode.

Sparkfun have the T4.1 in stock now. Just placed an order with them.

I wonder if there is a way to tell the new Teensy is manufactured by Sparkfun ? It would be useful to know.

I've attempted to port CANopenNode to Teensy but failed. Couldn't get the directory structure and search path to compile on the Arduino IDE. I did managed to get CANopenNode STM32 example to compile and working. Tested with CANopen Magic.

News made it on to Electronics Weekly: https://www.electronicsweekly.com/news/products/bus-systems-sbcs/arduino-compatible-teesny-cortex-m7-dev-boards-now-made-by-sparkfun-2025-03

Sparkfun offer cheaper shipping so that is good news. I wish they will offer an option of no printed card. The Teensy I buy will into a board that I sell and I don't need the printed card. I've got thousands of printed cards that go into the recycle bin.

Best to use FlexCAN_T4.h CAN1 and CAN2 are the same. CAN3 has FD capability.

Yes, you can use a level shifter but your Teensy 4.1 might have already been damaged if you applied 5v to its input. Try to use CAN1 or CAN2 instead of CAN3.

The MCP2551 is a 5v device with a 5v on the logic pin. The Teensy 4.1 is not tolerant on its input, you will damage the Teensy if it receives 5v. Try and use the MCP2562 instead. It has a separate VIO pin for the logic.

I can get 5Mb/s to work with these settings: CANFD_timings_t config; config.clock = CLK_60MHz; config.baudrate = 500000; config.baudrateFD = 5000000; config.propdelay = 188; config.bus_length = 1; config.sample = 75; You might want to try 4 or 6Mb/s instead. I found they are...

First, please post complete code so we can compile the sketch. The #include <FlexCAN_T4.h> is missing. The sender is working fine. The receiver needs a can1.events() Change your code to this: void loop() { can1.events(); if (can1.read(msg)){ Serial.print("ID...

With the FlexCAN_T4.h library you can call the error(CAN_error_t &error, bool printDetails) function. This will give you these type of errors: typedef struct CAN_error_t { char state[30] = "Idle"; bool BIT1_ERR = 0; bool BIT0_ERR = 0; bool ACK_ERR = 0; bool CRC_ERR = 0; bool FRM_ERR...

Your schematic like that is not going to work. If you look at the OLED module there is U2 and L1. You haven't got there on your schematic. On the OLED panel pin 2 is VCC. Look at datasheet section 4.3 page 10. VCC requires a voltage of 12v. You are connecting it to 3.3v Have a look at the...

Looking at the components around U2, there is an inductor (L1) there which suggest it is a power supply of some sort. Most probably a boost converter. Have a look at this board, it has a similar power supply: https://www.adafruit.com/product/1431

The LAN8651 uses the SPI bus, so connecting to the Teensy 4.0 module is relatively simple 4 wires.

@shawn, thanks for the offer. It will take me a few days to get the hardware ready for you. I will PM you once it is ready to ship. The Single Pair Ethernet chipset is the Microchip LAN8651 10Base-T1S MAC/PHY. It talks to the Teensy via SPI. I've ported a basic UDP demo to the Teensy and it...

Info on CAN termination: https://www.ti.com/document-viewer/lit/html/SSZTB40 Best to keep using the FlexCAN_T4.h and not FlexCAN.h Your code will then work as Classic CAN on can3 with the SN65HVD230 transceiver.

Have you closed the terminator header pins on the CAN transceiver board ? The SN65HVD230 is not CAN FD compliant. You need to use a CAN FD compliant transceiver such as the MCP2562FD chip.

First your code doesn't compile. You need to add: uint8_t count; Just comment out msg.flags.fd = 1; As can3 is already has CAN FD. On PCAN-View you should see something like this: With your error on PCAN-View, it could be your wiring to the CAN transceiver is not right. Which CAN...

You need to use the CAN port of the Teensy. On the card it is shown in pink. So you need to wire up like this: For CAN port can1 CRX1 on pin 23 CTX1 on pin 22 For CAN port can2 CRX2 on pin 0 CTX2 on pin 1 For CAN port can3 CRX3 on pin 30 CTX3 on pin 31 So the RX pin of your CAN transceiver...

Yes, pin 24 and 25 is not CAN.

The photo of the wiring connection doesn't look right. Looks like you are using pin 24 and 25. Those are UART pins, not CAN. You need to use pin 0,1 for can2. pin 30,31 for can3 and pin 23,22 for can1

As bicycleguy said, the CRX3 pin should be 3.3v the scope trace doesn't look like 3.3v On pin 8 (Rs) of the CAN transceiver is it connected to anything ? Can't see it from the photo. Try and connect it to GND. Also your code: for (uint8_t i = 0; i < msg.len; i++) { Serial.print(msg.buf, HEX)...

PJRC might not bring back the Teensy 3.2 but definitely need something less powerful and less power hungry then the Teensy 4.0 A Teensy 3.3 may be ?

It is useful to know the T4.0 also have a MAC address. I have a T4.0 ethernet project which needs a MAC address. I was going to use an external I2C MAC address chip. Now I know I don't need this anymore. The project is Single Pair Ethernet in which the T4.0 is communicated over SPI to the...

Strange, if you use this code on a T4.0 you get all 00s #include <QNEthernet.h> using namespace qindesign::network; uint8_t mac[6]; void setup() { // put your setup code here, to run once: delay(1000); Ethernet.macAddress(mac); // This is informative; it retrieves, not sets...

I've tested the T4.0 and can't find a valid MAC address.

I've tested a TEENSY41_NE board and found a MAC address.

Post a photo of your setup would help to see what is going on.

The max speed of CAN FD depend on the topology. I've managed to get 8Mbps in a point to point topology.

First the 100Ohm terminator is a bit low. They recommend 120Ohm. Try and change the clock setting from: cfg.clock = CLK_80MHz; to cfg.clock = CLK_24MHz; I think 80MHz is too high or it is not a clean dividable to get 2Mbps.

On the ISO1050 transceiver, have you applied the correct voltage on Vcc1 and Vcc2 ? Post a photo of your setup.

Yes, those changes are correct. They are needed as Markus library has changed to a two step init.

I have a RGB LED LIN-bus example working with the Teensy 4.0 and Markus's LIN library. https://github.com/skpang/Teensy40_CAN_FD_LIN-bus_NCV7430_RGB_demo Looks like jsimonkeller is making progress, lets see if he needs anymore help.

It is working on my M1 Mac Studio.

Good to see the forum is back.

You are using extended IDs. You need to add this : msg.flags.extended = 1;

The OBDII port I've seen uses 500k. Suggest you tried that. Depend on the make/model/year of your vehicle you may not see any data on its own. The OBDII port is not usually directly connected to the CAN network. It is via a gateway. You would need to do a request first, then the gateway will...

Do you have a GitHub link ?

If you plug the T4 and PCAN analyser in and the car bus goes silent. If the bitrate is set correctly then it could be that the CAN_H and CAN_L are swapped.

If you have a known working transceiver then the speed shouldn't really matter as long as it is 1Mbps or below. I would use your CAN-bus analyser, set it to 83.3k and connect it to your car to see if any data on PCAN-View. If you don't see any data that means it is not quite 83.3k If you see...

I don't have a device that runs at 83.3k so the following code might not work. All I can test is on a CAN-bus analyser. Try this : #include <FlexCAN_T4.h> FlexCAN_T4<CAN1, RX_SIZE_256, TX_SIZE_16> can1; uint8_t i; void setup(void) { can1.begin(); can1.setBaudRate(83333)...

I just replaced my library with your lin_bus.h and lin_bus.cpp files. Changed to LIN lin and move the lin.begin into setup(). It works!! This is now working as it used to be. Strange v1.58 broke it. Thank you KurtE for fixing this. It is not my library.

Putting LIN lin(&Serial3, 19200); inside the setup works ok but I can't access it in the main loop. I have to recompile the code and comment out the LIN lin(&Serial3, 19200) and upload again to get the crash report. CrashReport: A problem occurred at (system time) 19:17:32 Code was...

I'm using the lin_bus.h library with Arduino IDE 2.0.4 on a Teensy 4. https://github.com/MarkusLange/Teensy_3.x_4.x_and_LC_LIN_Master This is working with v1.57.2 and now I've upgraded to v1.58.0 but the Teensy looks like it crashes on startup. #include "lin_bus.h" LIN lin(&Serial3, 19200)...

Install, compile and upload ok on Mac Studio with Ventura 13.3

Assumed you have wired them up correctly. If you see waveform on CTX and steady state on CAN_H and CAN_L then the SN65HVD230D breakout board most likely to be faulty.