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Date: Tue, 17 Jun 2008 09:21:35 +0200
From: Wolfgang Grandegger <wg@domain.hid>
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Subject: Re: [Xenomai-help] Hello, doubts with RT-CAN
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To: quinty <webquinty2@domain.hid>
Cc: xenomai@xenomai.org

quinty wrote:
> Hello,
> 
> I am testing RT-CAN with MPC5200 and linux 2.6.23.14 <http://2.6.23.14> 
> , xenomai 2.4.2. <http://2.4.2.>
> Well I have some doubts:
> 1.- In kernel configuration, there is a parameter to change lenght of RX 
> CAN buffer, 1024 by default.
> What units???, 1024 bytes, 1024 telegrams??'

It is in bytes and must be 2^n.


> 2.- RT-CAN is a block or non-block??? in other words, when I use 
> rtcanrecv examples, code wait in this line of code
> 
> ret = rt_dev_recvfrom <http://www.xenomai.org/documentation/branches/v2.4.x/html/api/group__userapi.html#g0cc144457c649f197d485581686273dd>(s, (void *)&frame, sizeof(can_frame_t <http://www.xenomai.org/documentation/branches/v2.4.x/html/api/structcan__frame.html>), 0,(struct sockaddr *)&addr, &addrlen);, until driver recieve  message.

Yes, unless you have opened the socket with the non-blocking flag.

> 
> 3.- Have RT-CAN TX buffer???

No, Out-going messages are not queued.

What is your problem?

Wolfgang.