Re: RxFilter issues vcan

[Oliver Hartkopp <oliver.hartkopp@volkswagen.de>]

Am 30.05.2013 10:34, schrieb Sebastian Haas:
> Hi,
>
> Am 30.05.2013 06:58, schrieb Oliver Hartkopp:
>> On 29.05.2013 22:55, Sebastian Haas wrote:
>>> Hello everybody,
>>>
>>> I played a bit with the RxFilters and noticed that they are behaving somewhat
>>> strange.
>>>
>>> If I start candump this way:
>>> sh@helios:~/workspace/node-can$ candump vcan0,100~7ff,101~7ff
>>>   I want to receive any messages except 100h and 101h.
>>>
>>> When I send a message which matches the filter, it is received twice:
>>> sh@helios:~/workspace/node-can$ cansend vcan0 1ff#22
>>>    vcan0  1FF   [1]  22
>>>    vcan0  1FF   [1]  22
>>>
>>> When I send a message which should not received at all, it is received:
>>> sh@helios:~/workspace/node-can$ cansend vcan0 100#22
>>>    vcan0  100   [1]  22
>>>
>>> Did I misunderstood the filter here?
>>
>> The filters are independent and therefore "logical OR".
> Ok. That explain why received 100h even though I tried to filter it out. But
> why receive a message twice while it was only sent once?

You have defined two(!) filters that let pass the CAN-ID 0x1FF.

So what else would you expect?

:-)

>
> Sebastian
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