tonton81
Senior Member

FlexCAN_T4 works on Teensy 3.2, 3.5, 3.6, and 4.0 You can also use IFCT for Teensy 3.x

The clock can be changed using setClock, default for Teensy 3.x is 16MHz, you can try up to 60MHz on T4 If there is an error in the setBaudRate function it's been there since the original teachop/pawelsky's...

CAN2.0 or FD mode? If CAN2.0 you can use 307200 for the speed

You mean like the sending struct? CAN_message_t msg; msg.id = 0x123; msg.flags.extended = 0; msg.len = 8; msg.buf = myTemperature; Can0.write(msg);

Tie a gpio to reset pin ?

Calling new and delete dynamically will destroy your heap, not recommended for microcontrollers, be careful :)

Try lowering the I2C rate to 100000 and/or try the alternate Wire library as a test, as for the wiring we can only assume you followed the site but we can't physically see that until you post pictures

Dont know if this also helps, but the time slices of each thread can be changed which affects how long task switching stays in that thread, i had to adjust my time slices when i ran multiple uart displays in previous...

Define reliably? TeensyCAN is using the FD library to distribute 640 byte data with 64byte frames in about 1.5ms constistantly for days. If there is any issues in the FD library I usually respond to fix it within the...

CAN_message_t msg; msg.len = 8; msg.id = 0x321; msg.buf = 1; msg.buf = 2; msg.buf = 3; msg.buf = 4; msg.buf = 5; ...

Why not just run 2 uarts separately through USB converters, better yet, use the same UART and dynamically change baudrate, over a single usb to uart adaptor Serial1.begin(115200); //Do Something......

If you have it wired to the CAN lines, you can attempt to plug a simple OBD reader to the ECU to read the freeze frames, then, in your teensy serial monitor, you should be able to see the ECU address. Writing is...

TeensyCAN has now gone multi-bus mode! Nodes can be talked to on any or all of the 3 CAN busses on Teensy. Responses to nodes will happen to their appropriate busses. Globals now send to all 3 busses unless one is...

Thanks for spotting that :) Updated the fix on github: https://github.com/tonton81/FlexCAN_T4/commit/6cdb2054c46b7ac62c420725e59f5d068575cd1a ::events() now updated as well to return 12 bits each for TX/RX queue...

The whole point of the bootloader is not only to prevent bricking, but to prevent chinese clones from entering the market via normal hex uploading capabilities....

Use Serial1.begin(115200) to use pins 0 and 1 for uart, no need for pinMode

Try enableFIFOInterrupt()? MB version will ignore your request because MB0 doesnt exist in FIFO mode

Correct, the fan must get it's power from the mosfet or transistor, the teensy pin must only allow the signal to tell the mosfet/transistor to turn off or on. There are relay boards and mosfet breakouts you can find on...

#include <FlexCAN_T4.h> FlexCAN_T4<CAN2, RX_SIZE_256, TX_SIZE_16> Can0; void setup(void) { Serial.begin(115200); delay(400); pinMode(6, OUTPUT); digitalWrite(6, LOW); // enable tranceiver Can0.begin(); ...

First you must set the pin to output via pinMode(pin, OUTPUT); Then you can use digitalWrite(pin, HIGH) to turn it on and LOW to turn it off. However, you should NOT source power from the pin itself, the pin should be...

It's the tranceiver's job to handle the bus voltage, not the actual teensy pins. You need a canbus transceiver for teensy

Check out the circular buffer example for average() usages https://github.com/tonton81/Circular_Buffer/blob/master/examples/CB_Calculating_Statiscal_Values/CB_Calculating_Statiscal_Values.ino Just keep pushing the...

Yup, those look to be like alternate pins for CAN1

Skpang is correct. CAN3 pins (same ones for 2.0 and FD) are pads underneath the T4. The pads are very small so you need to be good at soldering tiny wires there or opt in for a breakout board, which couple were posted...

New update for TeensyCAN. Node Discovery! The library is able to keep a list of active nodes, their DLC capabilites (receive DLC size max), and their timeout on the network (millis()). The timeout depicts how long...

Why you using a period instead of a comma for writes? Should be "MB1,msg" Filters should be set after mailbox configuration (reject all) If using FIFO, MB0-7 dont exist, and using setMB does nothing with them ...

The debug prints? If so, try enabling the lpuart clock, CANFD wont work without lpuart clock enabled....

FlexCAN_T4 also works on Teensy 3.x, but was tested during that time on a Teensy 3.5

Yeah just don't use reset, as per the datasheet: The following registers are reset: MCR (except the MDIS bit), TIMER , ECR, ESR1, ESR2, IMASK1, IMASK2, IFLAG1, IFLAG2 and CRCR. Configuration registers that control...

Dont use reset() at all, it will wipe out begin() configuration. Reset() is not complete yet in the library.

Upped to github is a new update to TeensyCAN. USB Serial & UART accesses can be called specifically to a node or globally on the network of nodes! Node.Serial.println("Hello World!"); // prints to Serial monitor of...

FlexCAN_T4 readme documentation updated. CANFD mode setBaudRate changed slightly. Two ways of calling: FD.setBaudRate(config); /* no printout will occur, with the default listing entry of 1st on CAN and 1st on...

if ( Serial.available() ) { uint8_t receivedByte = Serial.read(); if ( receivedByte != lastByte ) { //Do Something... } lastByte = receivedByte; // store the last byte as previous byte

FlexCAN_T4 has been updated! Up to 3 raw outputs are enabled in background for external libraries (you know where this is going.......... :) ) All reception mailbox has mass enabler for interrupt capability! No...

After you compare it: myByte == lastByte, or however you wish to compare, then set it to the new value: lastByte = myByte; Then your code repeats it

A class static/auto or global variable is needed where you can copy the last byte to and check later on Simply can put it before the void setup() line: uint8_t lastByte = 0; void setup() { ....

I don't think you can use the core Serialx library on a modified single wire bus, you'd need to implement another library to handle it.

Yes, thanks for the concern. I hopefully will have finished off the FlexCAN_T4 which would be a successor to IFCT in terms of performance, while maintaining the Teensy 3.x compatibility. If there are any bugs, I'd like...

Its a bad usb cable, try another

Weird, that register shouldnt do anything except activate the mailbox in hardware, did you try it in another teensy?

Thats the register for the code field, so i dont see how it gets stuck there, can you print something in serial monitor before and after that line to see if it prints both texts?

Does it restore when you properly fix the cables/resistor? The problem is your trying to access the registers despite being in a bus off state. Can you reproduce this between 2 teensies? Also if you can try out an...

Serial or i2c is feasable. But you will need to handle the serial data to parse the data you need, in i2c/spi you can send/receive data as blocks, like an indiced array ordered, 3rd option is CAN, but you would need...

It has nothing to do with my profile picture, no need to judge me based on a picture of the work i did on my car... Why is it obscure? Just because I modified my car makes me incapable of writing a library for general...

Setlistenmode effectively disconnects the writes from the network, another option would be putting the controller into freezemode (like a paused state), indefinately, until switched back to normal mode

HardwareSerial* ports = { Serial1, Serial2, Serial3 }; ports->available(); ? Untested but if theyre all in same class just create array of pointers

Msg.timestamp? It uses same structure, its a 16 bit rollover counter

Did you see the madness Catalina did to people with gmail, random email deletions and blank sent folders. Lol apple messed up big time

Try out IFCT, it has very easy examples to get up and running

Check your constructor, you need to use "CAN2" and remove "FD" from FlexCAN_T4FD, CAN2 is pins 0 and 1 and you need this to be able to communicate with T3 FlexCAN_T4FD<CAN3, RX_SIZE_256, TX_SIZE_16> FD; Thats a...

Thanks, just added it :)

Daisy chaining will work but is fault tolerant. If one node drops, you cut off a segment of the network. In canbus all nodes are wired in parallel, and if one goes offline, all other nodes remain working as programmed ...

This looks like a perfect candidate for CANbus. Every node gets a message and it is multi master so they can all talk together As for length, you can do a kilometer if you want over 3 wire UTP :)

Break out some liquid nitrogen and/or phase change cooling :)

Check out the flexcan_t4 thread, each bus has it's own object in a different templated constructor, you can call them myData and myCritical if you wish, then use them like normal, myData.begin(), etc Yes,...

Yes it would be for inactive CAN controllers. If a user uses CAN2, he can optionally use CAN1 or CAN3 for non-volatile ram storage which should be pretty fast, the controller will remain in freeze mode so the data wont...

Hi defragster, just following up on older post about flexcan memory Is there any interest in using unused flexcan controllers for RAM storage? If so, on T3, 48 dwords are accessible for 16 MB space, plus maybe 3-4...

Name can be anything you want it to be, like a variable, yeah Txmsg is an example to let you know its a transmit message

The library is out (FlexCAN_T4) which supports all 3 busses 2.0 and FD. CANFD pins are available on the underside pads of the teensy 4, CAN1 and CAN2 are available as pins on T4, they support 2.0 only, a transceiver...

The TX normally sits high unless theres another node transmitting on the bus. Not everyone is familiar with the hardware, i myself am more into the software part of it

1) Library has been updated officially to support T3.x. 2) The FD mailbox offsets have been further optimized. 3) As per request of skpang, EDL and BRS reception flags have been added to the message struct and...

Its basically like a container that has multiple variables. As an example above, these work: msg.id; msg.buf; msg.flags.extended,

Receive message, its just a struct with the id, data, etc

After the last update I worked on adding Teensy 3.x support. Here it is for testing! Currently This compiles on both Teensy 3.5 and Teensy 4.0 on my test bench, and looks to be working. I've separated it from the main...

Hello all, I just updated CAN2.0 on github. It has distributions and enhancements (smart filtering) working. Any potential bugs let me know ;P CAN2.0 and CANFD have both been running in parallel during my tests....