Neil,

Im using the library with an Arduino Uno and a SparkFun CanBus shield. Im seeing two different things and I wonder if you would have some feedback:

1.) CAN.available() always returns 0 for me. Immediately after setup, and anytime afterwards. Is this expected?

2.) When I run my very basic test project to send data to the can bus, see in the logs "write2" after my calls to CAN.write() only 3 times and then it stops, no matter how many more calls I make to CAN.write(). I checked the source and it looks like I've filled the write buffers, but I had assumed that the buffers would clear themselves without a secondary "reader" device on the line to clear them. Is that a correct assumption?

Many thanks,
Mat

Hello.
I tried to compile the "Recieve CAN Messages" example for AT90CAN board and got errors

C:\Users\VADIM\AppData\Local\Temp\arduino_build_445438\sketch\ReceiveCANMessages.ino.cpp.o: In function `CAN_AT90CAN::begin(unsigned long)':
C:\Users\VADIM\Documents\Arduino\libraries\CAN_Library-master/CAN_AT90CAN.h:180: undefined reference to `CAN_AT90CAN::begin(unsigned long, unsigned char)'
C:\Users\VADIM\AppData\Local\Temp\arduino_build_445438\sketch\ReceiveCANMessages.ino.cpp.o: In function `readMessage()':
C:\Users\VADIM\AppData\Local\Temp\arduino_modified_sketch_693090/ReceiveCANMessages.ino:50: undefined reference to `CAN_AT90CAN::available()'
C:\Users\VADIM\AppData\Local\Temp\arduino_modified_sketch_693090/ReceiveCANMessages.ino:52: undefined reference to `CAN_AT90CAN::read()'
C:\Users\VADIM\AppData\Local\Temp\arduino_build_445438\libraries\CAN_Library-master\CAN_AT90CAN.cpp.o: In function `CAN_AT90CAN::CAN_AT90CAN()':
C:\Users\VADIM\Documents\Arduino\libraries\CAN_Library-master/CAN_AT90CAN.cpp:73: undefined reference to `vtable for CAN_AT90CAN'
C:\Users\VADIM\Documents\Arduino\libraries\CAN_Library-master/CAN_AT90CAN.cpp:73: undefined reference to `vtable for CAN_AT90CAN'
collect2.exe: error: ld returned 1 exit status

What I can do for fix it?

MCP2515 runs @8MHz with Arduino Uno with no problem using another CAN lib.
With Arduino Due, @16 Mhz default in your program, I couldn't receive any CAN Data from Vehicle OBDII.
How can I change 16 Mhz to 8 Mhz.

Thank you

Ozer

does this library work on stm32 with arduino ide?

Hi, I have a problem with losing 1 frame, on SAM3X8E
I get packets of 256 frames.
problem is the loss of 1 frame (eventually).

receive file
ex:
read(256)...ok
read(256)...ok
read(255)...bad <---cause the processing to stop
read(256)...ok

tried with con0.init() library
I tried direct mode can_init(CAN0, 84000000, bd).
send receiver ok, but sometimes miss 1 frame,
I use fifio buffer, I tried 2 types (fifo or Queue ).

I thought it might be CAN_BR =00142211, 500k /12xtal

if anyone has any new ideas.

thanks.

I'd like use two MCP2515 controllers for filtering/gateway a midspeed CAN-Bus (125kbs). All your examples, and even the documentation did not mention this setup. All the examples did not explicit instantiate from a class, they just simple use "CAN.".

So i tried to do: CAN TOBUS(9); but this gave me an error while compiling.
Also CANClass TOBUS(9); did not work.
Even CAN_MCP2515 TOBUS(9); failed.

What do i do wrong? Could you please provide an example for it?

Does this library support J1939 multi-frame messages?

In CAN_MCP2515.h the label MCP2515_RXM0 is defined twice. Once at line 158 and again at line 281. Nasty.

CAN Filters will not work in the prepared manor if setMask, setFilter and all the other helpers are defined private. MemFuncs writeAddress, setMode, readRXStatus, setMask, setFilter and readAddress at least should be public.

Now filters for std messages work - extened messages still don't get filtered/accepted.

Hi.
I'm just trying to use the library to create a canbus beetwen teensy boards and arduinos.

I can, with the example, send and receive message from a teensy board to another teensy board with the example.

But i can't send or receive message from an arduino to another with the sample example !!
I have an MCP 2515 connect to him. all connection are good+ 16mhz oscillator.

Do you have some example for each module. one for mcp25-15 (send and receive) and one for teensy.

i want to create a canbus beetween an arduino and a teensy board.

(I either tried other library with mcp25-15, it's work beetween arduino's but the teensy can't receive any message).

can you help me i'm lost.

I tried to send a message that is longer that 8 bytes, but it's always sending 8 bytes no matter what I tried. Am I missing something?

I have installed the library and am trying to compile the SendCANMessages example.

I'm getting the following errors:

Arduino: 1.8.5 (Windows 10), TD: 1.41, Board: "Arduino Due (Native USB Port)"

libraries\CAN_Library\CAN_SAM3X.cpp.o:(.rodata._ZTV9CAN_SAM3X+0x20): undefined reference to `CANClass::setMask(unsigned char, CAN_Filter)'

libraries\CAN_Library\CAN_SAM3X.cpp.o:(.rodata._ZTV9CAN_SAM3X+0x24): undefined reference to `CANClass::setMask(CAN_Filter)'

libraries\CAN_Library\CAN_SAM3X.cpp.o:(.rodata._ZTV9CAN_SAM3X+0x28): undefined reference to `CANClass::clearMask(unsigned char)'

libraries\CAN_Library\CAN_SAM3X.cpp.o:(.rodata._ZTV9CAN_SAM3X+0x2c): undefined reference to `CANClass::setFilter(unsigned char, CAN_Filter)'

libraries\CAN_Library\CAN_SAM3X.cpp.o:(.rodata._ZTV9CAN_SAM3X+0x30): undefined reference to `CANClass::setFilter(CAN_Filter)'

libraries\CAN_Library\CAN_SAM3X.cpp.o:(.rodata._ZTV9CAN_SAM3X+0x34): undefined reference to `CANClass::clearFilter(unsigned char)'

libraries\CAN_Library\CAN_SAM3X.cpp.o:(.rodata._ZTV9CAN_SAM3X+0x38): undefined reference to `CANClass::enableRXInterrupt()'

libraries\CAN_Library\CAN_SAM3X.cpp.o:(.rodata._ZTV9CAN_SAM3X+0x3c): undefined reference to `CANClass::disableRXInterrupt()'

collect2.exe: error: ld returned 1 exit status

exit status 1
Error compiling for board Arduino Due (Native USB Port).

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

Hi,

I've found an little bug in the filter code of CAN_MCP2515.cpp.
Pls. look at line 697 at https://github.com/McNeight/CAN_Library/blob/master/CAN_MCP2515.cpp
for the variable filterID - IMHO it should be filterAddress.

Bye,
Martin

Hi,
are you including these can driver for the atmegaXXM1 cpus family?

https://github.com/thomasonw/avr_can