CANopen error message

Cristian Anceschi <cristian.anceschi@...>

Hi all

I'm developing a CANOPEN node based on an nRF52DK nRF52832 (PCA10040) board  wired to a MCP2515 and a MCP2551 devices.
So far, through a CAN Interface for USB plugged to a PC, I can receive and transmit packets and command from and to the board

When I compile the project and launch the Zephyr debug, the first message received by the PC over the CAN bus is an error message (hex string). Received only once, at reset.

08A 00 61 01 2A 00 00 00 00 00

which means that the system it is unable to allocate memory for object (CO_EM_MEMORY_ALLOCATION_ERROR).
The log file at the boot is

  *** Booting Zephyr OS build v2.4.0-ncs1  ***
[00:00:02.737,579] [0m<inf> fs_nvs: 6 Sectors of 4096 bytes [0m
[00:00:02.737,579] [0m<inf> fs_nvs: alloc wra: 1, e90 [0m
[00:00:02.737,579] [0m<inf> fs_nvs: data wra: 1, 210 [0m
[00:00:02.739,776] [0m<dbg> canopen_storage.canopen_settings_set: restored object dictionary EEPROM entries [0m
[00:00:02.739,807] [0m<dbg> canopen_driver.CO_CANmodule_init: rxSize = 13, txSize = 9 [0m
[00:00:02.740,814] [1;31m<err> canopen_driver: failed to attach CAN rx isr, no free filter [0m
[00:00:02.740,875] [1;31m<err> canopen_driver: failed to attach CAN rx isr, no free filter [0m
[00:00:02.740,905] [1;31m<err> canopen_driver: failed to attach CAN rx isr, no free filter [0m

[00:00:02.740,966] [0m<inf> app: CANopen stack initialized [0m
After this a guard message (hex string) , every 1 second,  is received over the CAN bus

70A 7F

The node appears in pre-operational state.
No other error messages are shown by the PC via the Zephyr debug system.

In this condition, sending NMT commands, it is possible to force the node to:
  • Enter in STOP mode
  • Enter in Pre-operational mode (from STOP mode)
  • Reset node
  • Reset communication
The node however doesn't enter in operational mode.

Might the reason for this latest fact be, that there is an error at reset, so that the node won't enter in operational mode because of this?
What can be the cause of the error? Is there a THREAD STACK SIZE or some other parameter I have to change to solve the problem?

Or can I suppose that the error message can be overlooked because the node has to start and then everything works as expected? I mean, the node after all IS receiving commands like I said above.

In any case I believe that the node has to be moved away from the error condition in order to proceed. What should be the best way to do this?                                                                                                                                                                                                                                                                                                      Thanks in advance for any hints and support                                                                                                                                                                                                                                                                                                                                          Kind regards                                                                                                                Cristian                                                                                                                                                                                                                                                                                                                                                                                                                                           

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