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are you using pins 0 & 1 for CAN2?
are you using level shifters? teensy is 3.3v
is the Rs pin driven low?

only thr t4.x masters needs specific dse bits set, other masters work fine

the master 4.x need a patch for the DSE bits, check out the commits for SPI_MSTransfer_T4, this only affects the master, just make sure your ground is the one next to the 5v pin (not near pin 0)

Hardware only sends transmission once but only if it is successful. It will retry until a valid ACK occurs and then it can continue to next frame. Be sure a node is on the bus to ACK it and check the...

i don't see POPR used in your last code, both of them must be used. if you dont care for POPR (receiving) then flush it at very least:


(void)mySPI.popr();

for the 4.x slave check if you're using the GND beside the 5v pin, and not the one beside pin 0

there is no buffer, this is a fixed register in the SPI hardware
POPR receives byte from bus master...

Is there any data on the bus? If it's in a TX mailbox it should be writing out, what does mailboxstatus print out?

thats the master, have you tried the master slave examples as a start to make sure your wiring is okay? the examples do work so they will rule out if it's a software or hardware connection issue

do a mailboxStatus(), if it still stays there after you stop transmitting, verify your baudrate, terminations, transceiver connections. it will stay in the mailbox and software has no control over...

each hardware mailbox stores only one frame during poll mode. if you use interrupts, a queue system automatically collects the mailboxes so they can receive another frame. From that queue, the...

still that error makes no sense if you have it set to teensy T4.x. maybe its because it's a french IDE having incompatibilities with teensyduino? nothing in the library is avr related

is that the only method you need working? if so, you can temporarily add it as a virtual method in FlexCAN_T4_Base class (virtual method(args) = 0) and it will work until i figure out a template...

You can use the base class as an alternative




FlexCAN_T4<CAN1, RX_SIZE_256, TX_SIZE_16> Can0;

class TestClass {
private:
FlexCAN_T4_Base* bus = nullptr;

I wrote a post regarding using template objects, it just replicates your function for X busses without doubling it in the sketch.
...

same device? well i would imagine the interrupt being held open with active locked, the loop wouldnt be able to send anything until that's done, i never tested it as a loopback but thats where you...

yes, latest always on github for any library

never heard of that error before, make sure you have teensy selected as the board

should be the arduino/libraries folder, not the main project location

if thats the 4.1, could you try the GND on the other side of the board, not the one next to pin 0

try 2.2k resistors instead of 4.7k for 3.3v i2c

I can't see all your code but just remove events() from the loop() if you have it so the callback will fire directly rather from the events() queue system, this will disable the RX queue system and...

most libraries depended on the original flexcan.h, however the one you are using is custom and accesses the hardware directly without depending on flexcan.h. Once you remap the addresses and figure...

we had -20 winters here and t4.0 ran fine, it was running 24/7

the registers should be fine to port the older library to t4, however if you look at flexcan_t4's begin() you'll see the initialization routines needed, and you'll need to remap the address of can0...

both are the same, they call same function, so it's user preference really. You can continue writing to the buffer it will overwrite older values when full, no need to empty it and wait for it to...

every person has a preference so this is what I mostly use:



static uint32_t t = millis();
if ( millis() - t > 1000 ) {
// DoSomething();
t = millis();
}

i2c does need pullups even for 3.3v, use 2.2k

Just out of curiosity for SPI0 try to run this after SPI.begin() using default SPI pins on the T4.1 master:



#if defined(__IMXRT1062__)
IOMUXC_SW_PAD_CTL_PAD_GPIO_B0_01 = IOMUXC_PAD_DSE(3)...

According to the author of the port:



I am wondering if the modified core as well as updated toolchain have a side affect to this...

By the way USBHost.h was not found, which library you...

that's an assert error from free-rtos end on the memory map itself, that could be a problem with the freertos port

have you tried fresh rtos with blinking light?
and
have you tried all your code...

perhaps a demo example of usbhost on t3.6 with rtos and how it crashes, it could just be a code issue, maybe UB or sepamore issue. RTOS is very finicky sometimes, I have an ESP32 using quad ble...

there are also multiple timing parameters for FD in the Advanced setbaudrate config menu, it displays all the timings for the same bitrate so you can pick one from the list, by default it uses the...

have you tried other baudrates? tried changing the clock to 60?

collink had same if not similar issue with 500000/2000000 specifically, while 1000000/2000000 was fine

unfortunately you're limited by the bus speed, abort cancels a transmission and may or may not guarentee the frame be sent out or not still, plus that would lead to more latency and missing frame to...

Uploaded patch for return value 0 if queue was full.
Tested it as well:


for ( int i = 0; i < 30; i++) {
CAN_message_t msg;
msg.id = 0x555;
msg.seq = 1;
...

the sender only has a transmit queue of 16, you'll need to increase that if you plan to burst

i went to check the write function unfortunately it doesn't check for overflows, as they'll return -1...

https://github.com/tonton81/SPI_MSTransfer_T4

It works on all Teensy LC, 3.x, and 4.x

I made a daisy-chainable SPI slave library, you can use it either separate or same CS, and you can send whatever arrays you want from master to slave or slave to master

you could do it yourself...

yeah, its just for curiosity, we had an issue with SPI talking to an SPI slave T4 and this ressolved it, if it can fix other stuff since you have a scope it can be a good reference to look back on

out of curiosity, can you try this?
put it AFTER SPI.begin()


#if defined(__IMXRT1062__)
IOMUXC_SW_PAD_CTL_PAD_GPIO_B0_01 = IOMUXC_PAD_DSE(3) | IOMUXC_PAD_SPEED(3) | IOMUXC_PAD_PKE; /*...

a scoped mutex would be sufficient there

did you try threads.delay() ? i think we not suppose to use delay() in threads

Use TeensyThreads, even though RTOS on ESP32 uses 2 cores mostly it uses tasks on core 1 for arduino, TeensyThreads is very good at switching tasks(threads), although there are no sepamores you still...

solder joints look weak, did you adjust your code?
the fifo example with interrupts is a good start as that is guarenteed to work, provided you choose the right bus in the constructor and baudrate...

As paul said you need a proper circuit with logic mosfets and series resistor to protect the pins. You shouldn't be driving loads only applying a signal where the mosfet or relay takes care of the...

i am using an esp32 with mosfets being commanded by teensy over CAN. So teensy can control the 10 gpios currently connected to the esp32. i also posted a sketch for it on github. mosfet boards you...

must be setMB configured before doing any filterwork, by default with fifo disabled the 4 first ones are STD while next 4 are EXT then 8 TX.

yes with the transceivers it will work as it's intended.

9600 isn't a standard CAN bitrate though. Try 125000 on low end, recommended 500000

How can your PC serial monitor see traffic if:
A) you have no callback
B) you're not polling
C) you are not using interrupts.

Sending may be working but you will never receive anything. Take a...

it doesn't work that way, it works based on the payload which can come in from anywhere. if you do go that route you'll most likely use filtering, but its a background queue that reassembles the...