Programming Extended Message ID Filters

If space is reserved in Extended Message ID CAN filters in device tree node, then extended filters can be configured using following sys interface:

/sys/devices/c310000.mttcan/net/can0/xtd_filter
  • Enter echo help(h) to the sys interface to obtain the format for the parameters to be provided in dmesg.
    #echo h > /sys/devices/c310000.mttcan/net/can0/xtd_filter
[250873.532674] net can0: Invalid std filter
[250873.536673] usage:eft=0..3 efec=0..7 efid1=ID1h efid2=ID2h idx=i

    Where:

    • The efid1 and efid2 are in HEX.
    • The eft, efec, and idx are in unsinged integers.
    • The idx field is optional.
    • If the index is provided, then the given index filter is updated; otherwise the filters are assigned incrementally.

    For example:

    echo "eft=0 efec=2 efid=0x7 efid2=0x21 idx=0" > /sys/devices/c310000.mttcan/net/can0/xtd_filter