Receiving messages issue

Receiving messages issue

[Luka Rahne]

I am using MCP2515 with  i.MX27

Now my problem is that candump (and my application) doesn't receive
all messages.

I have multiple devices (low end Freescale mcf51JM) on Can that each
send  message at boot-up. If I turn-on all nodes at same time, they
send all messages at same time.

For some reason that makes problem for i.MX27 system

Beside single i.MX27 on bus and 5 mcf51JM nodes there is also PEAK-CAN
usb device for sniffing.

luka@pcan-usb:~$ candump any
  can0      2002  [8] 48 61 69 46 6F 6C 6B 7A
  can0      2012  [8] 48 61 69 46 6F 6C 6B 7A
  can0      2022  [8] 48 61 69 46 6F 6C 6B 7A
  can0      2032  [8] 48 61 69 46 6F 6C 6B 7A
  can0      2042  [8] 48 61 69 46 6F 6C 6B 7A
//this if fine


luka@iMX27:~$ candump
interface = can0, family = 29, type = 3, proto = 1
<0x00002002> [8] 48 61 69 46 6f 6c 6b 7a
<0x00002012> [8] 48 61 69 46 6f 6c 6b 7a
<0x00002032> [8] 48 61 69 46 6f 6c 6b 7a
<0x00002042> [8] 48 61 69 46 6f 6c 6b 7a


As You can see iMX27 lost message (  can0      2022  [8] 48 61 69 46
6F 6C 6B 7A <- is lost )
and this happens each restart on all mcf51JM nodes so it is predictable.

There were some freezing kernel/stalling issue @ kernel 3.0.4 but they
are gone since i compiled on 3.0.81.
Kernel is 3.0.81

I am  new with all this, so any pointers will be appreciated.

Re: Receiving messages issue

[Marc Kleine-Budde]

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On 06/24/2013 02:26 PM, Luka Rahne wrote:
> I am using MCP2515 with  i.MX27

MCP2515 is the second worst CAN hardware I know. Only MCP2510 is worse.

You can try Andre B. Oliveira's async mcp2515 driver. It's here:

http://git.pengutronix.de/?p=mkl/linux.git;a=shortlog;h=refs/heads/can/mcp2515-async

regards,
Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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