Re: [Xenomai-help] CAN

[Wolfgang Grandegger <wg@domain.hid>]

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Urs Eichholzer wrote:
> Hi
> 
> We are using Linux 2.6.19.2 and Xenomai 2.3.0

Xenomai 2.3.0 is quite old and I recommand to  update to 2.3.5., at lreast

> The problem disapeared when we not changed the baudrate (we try to scan the
> bus..). What shoult be the time between changing the baudrate?

Ah, I see. Does the attached patch help?

Wolfgang.


> Thank's
> 
> Urs
> 
> From: Wolfgang Grandegger [wg@domain.hid]
> Sent: Wednesday, April 09, 2008 12:19 AM
> To: Urs Eichholzer
> Cc: xenomai@xenomai.org
> Subject: Re: [Xenomai-help] CAN Probleme
> 
> Hi Urs,
> 
> Urs Eichholzer wrote:
>> Hello
>>
>> We are just start to use the setup...
>> We try to read parameters from a device true the CAN. From some
>> parameters we get proper replay and with other parameters we get the
>> following message:
>> rtcan0: btr0=0x05 btr1=0x4f
>> rtcan0: btr0=0x0a btr1=0x6f
>> rtcan_mscan_start_xmit: TX buffer not empty
> 
> Hm, this message is pretty fatal. What version of Linux and Xenomai do you use?
> What type of parameters do you read when the error message shows up. Can you
> reproduce the problem with a little example program?
> 
> Thanks,
> 
> 
> ----------------------------------------------------------------
> This message was sent using Samart Web Mail 2005.
> 
> 


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Index: rtcan_mscan.c
===================================================================
--- rtcan_mscan.c	(revision 3454)
+++ rtcan_mscan.c	(working copy)
@@ -358,6 +358,10 @@ static int rtcan_mscan_mode_stop(struct 
     if (!CAN_STATE_OPERATING(state))
         goto out;
 
+    regs->canrier = 0;
+    if (!(regs->cantflg & MSCAN_TXE0))
+	    regs->cantarq = MSCAN_TXE0;
+
     /* Switch to sleep mode */
     regs->canctl0 |= MSCAN_SLPRQ;
     regs->canctl0 |= MSCAN_INITRQ;