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Hi Mark,<br>
<br>
In reverse order... I doubt that the delivery order would relate to
the behavior I observed, as the frames are still being delivered.
So, that answers my original question.<br>
<br>
But to the HUD, the way the HUDs and OBD dongles I've used work is
that they poll a set of parameters periodically (some fairly
rapidly), and use the response from the car to update their
display. The one I designed the obd2ecu task around polls for 4 of
them, if I recall: 0x05 (engine coolant temp), 0x0C (Engine RPM),
0x0D (Vehicle speed), and 0x10 (MAF air flow rate), at least by
default. The obd2ecu task responds to those requests with data from
the OVMS metrics table, based on a PID->Metric mapping. I'm sure
I took bus traces at the time I was trying to debug this, but can't
lay my hands on them right now. My debug environment, while
physically intact, is a few years out of date now, and uses the
original 3.0 hardware. (Does the current code even still compile
there?) <br>
<br>
As I noted, the easy workaround is to code a set of events for
vehicle.on and vehicle.off, which are needed anyway to track the
display power with the vehicle key state. The addition is to
vehicle.on, to cycle the obd2ecu task. That prevents the hang.<br>
<blockquote>OVMS# vfs cat /store/events/vehicle.on/myevent<br>
power ext12v
off
<br>
obdii ecu
stop
<br>
obdii ecu start
can3
<br>
power ext12v on <br>
<br>
OVMS# vfs cat /store/events/vehicle.off/myevent<br>
power ext12v
off
<br>
</blockquote>
Anyway, thanks for your continued leadership on the project! Hope
you had (are having) a good Holiday season. <br>
<br>
Greg<br>
<br>
<br>
<div class="moz-cite-prefix">Mark Webb-Johnson wrote:<br>
</div>
<blockquote type="cite"
cite="mid:3BCA441F-F74E-45B7-AB09-A7CCFDDE32FB@webb-johnson.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
I think we would need to see the status of the can bus and a trace
of the traffic to know for sure what is going on. I find it
strange the HUD would send request (I thought that purely
responded to requests from the OVMS master?).
<div class=""><br class="">
</div>
<div class="">Apart from the SPI changes, the only change to the
MCP2515 driver made here was to improve in-order delivery and
throughput. I doubt that would improve the situation with a hung
HUD.</div>
<div class=""><br class="">
</div>
<div class="">Regards, Mark<br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On 6 Jan 2022, at 2:18 AM, Greg D. <<a
href="mailto:gregd2350@gmail.com" class=""
moz-do-not-send="true">gregd2350@gmail.com</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" class="">
<div text="#000000" bgcolor="#FFFFFF" class=""> Hi Mark,<br
class="">
<br class="">
Simply power cycling the HUD didn't work. The only way
I could clear the issue was to restart the application
while the HUD was turned off (ext12v off). As I recall,
watching the CAN bus with a monitor showed the HUD was
sending requests, but they were not being received by
the application. So I concluded something was odd with
the driver, but never pinned it down.<br class="">
<br class="">
Greg<br class="">
<br class="">
<br class="">
<div class="moz-cite-prefix">Mark Webb-Johnson wrote:<br
class="">
</div>
<blockquote type="cite"
cite="mid:3029DF05-0B5E-450A-9486-D1BB3E301FF9@webb-johnson.net"
class="">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" class="">
If a power cycle of the HUD fixed the problem, then it
sounds like the issue is more likely on the HUD side.
Conversely if a stop+start of the CAN on ovms fixed
it, then I would suspect our driver.
<div class=""><br class="">
</div>
<div class="">Regards, Mark.<br class="">
<div class=""><br class="">
<blockquote type="cite" class="">
<div class="">On 4 Jan 2022, at 11:05 AM, Greg D
<<a href="mailto:gregd2350@gmail.com"
class="" moz-do-not-send="true">gregd2350@gmail.com</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta http-equiv="Content-Type"
content="text/html; charset=UTF-8" class="">
<div style="word-wrap: break-word;
-webkit-nbsp-mode: space; line-break:
after-white-space;" class="">No error flags
as I recall. It just stopped receiving
frames. I tried to figure out how to clear
it in the driver, but never succeeded. The
workaround was to cycle the ext12v,
restarting obd2ecu between off and on,
triggered by a Car-on event.<br class="">
<br class="">
Greg<br class="">
<br class="">
<br class="">
<div class="gmail_quote">On January 3, 2022
6:54:22 PM PST, Mark Webb-Johnson <<a
href="mailto:mark@webb-johnson.net"
class="" moz-do-not-send="true">mark@webb-johnson.net</a>>
wrote:
<blockquote class="gmail_quote"
style="margin: 0pt 0pt 0pt 0.8ex;
border-left: 1px solid rgb(204, 204,
204); padding-left: 1ex;">
<div class=""><br class="">
</div>
I don’t know the cause of the HUD bus
hang, so really not sure if it is
resolved or not. The SPI driver is the
standard ESP IDF one now, so should be
stable. But what was the state of the
bus when it hung? Perhaps some error
condition set in the MCP2515?<br
class="">
<div class=""><br class="">
</div>
<div class="">Regards, Mark</div>
<div class=""><br class="">
<blockquote type="cite" class="">
<div class="">On 4 Jan 2022, at
10:46 AM, Greg D <<a
href="mailto:gregd2350@gmail.com"
class="" moz-do-not-send="true">gregd2350@gmail.com</a>>
wrote:</div>
<br
class="Apple-interchange-newline">
<div class="">
<div dir="ltr" class="">Hi Mark,<br
class="">
<div class=""><br class="">
</div>
<div class="">Trying this
again... (got a 554 blocked
reply the first time).
apologize if it's a duplicate.<br
class="">
</div>
<div class=""><br class="">
</div>
Will this fix the bus hangs we
have with the HUD devices? Ref:
"Can buses stop after some time"
email thread from 5/28/2019...
As I wrote at the time, a 100%
way to reproduce the hang was to
have a HUD device running, <i
class="">then</i> start the
OBD2ECU task. I haven't used my
HUD in some time, so I don't
know if this was fixed since
then. If not, that was a very
quick and easy way to reproduce
the issue.<br class="">
<br class="">
Happy New Year!<br class="">
<br class="">
Greg</div>
<br class="">
<div class="gmail_quote">
<div dir="ltr"
class="gmail_attr">On Mon, Jan
3, 2022 at 5:10 PM Mark
Webb-Johnson <<a
href="mailto:mark@webb-johnson.net"
class=""
moz-do-not-send="true">mark@webb-johnson.net</a>>
wrote:<br class="">
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div style="overflow-wrap:
break-word;" class="">An
update on this.
<div class=""><br class="">
</div>
<div class="">Working with
another developer, we have
made some changes in a
’spimaster’ branch:</div>
<div class=""><br class="">
</div>
<div class="">
<ol class="">
<li class="">Stop using
spi_nodma fork of
ESP’s standard spi
code, and switch back
to use the standard
ESP IDF spi master.<br
class="">
<br class="">
</li>
<li class="">To support
>3 devices (which
ESP IDF spi master
doesn’t due to
hardware limitations
of CS line and 3x DMA
channels), change to
use software CS line
for the MAX7317 driver
(the MCP2515 continue
to use hardware CS).<br
class="">
<br class="">
</li>
<li class="">Confirm the
changes to our MCP2515
driver related to
keeping track of the
last buffer read, to
solve the out-of-order
issue.<br class="">
<br class="">
</li>
<li class="">Confirm the
fix for another
related issue where we
don’t block (delay) if
the can tx queue is
full.</li>
</ol>
<div class=""><br class="">
</div>
<div class="">These seem
better now, and I am
able to establish a CAN
IP connection over
MCP2515. Frames come in
order, and we are seeing
performance around 700
frames/second - which
should be adequate for
our needs.</div>
<div class=""><br class="">
</div>
<div class="">I’ll do some
more testing over the
next few days, and if no
issues found merge back
to master.</div>
<div class=""><br class="">
</div>
<div class="">Regards,
Mark.</div>
<div class=""><br class="">
<blockquote type="cite"
class="">
<div class="">On 7 Jun
2021, at 12:16 AM,
Michael Balzer <<a
href="mailto:dexter@expeedo.de" target="_blank" class=""
moz-do-not-send="true">dexter@expeedo.de</a>>
wrote:</div>
<br class="">
<div class="">
<div class="">
<div class="">
<div class="">Signed
PGP part</div>
<div class="">
<div class="">
Mark,<br
class="">
<br class="">
I've just
found a
spot-on post
on this issue:<br
class="">
<br class="">
<a
href="https://www.microchip.com/forums/tm.aspx?m=620741"
target="_blank" class="" moz-do-not-send="true">https://www.microchip.com/forums/tm.aspx?m=620741</a><br
class="">
<br class="">
Tom suggests
implementing a
state machine
to reproduce
the receive
order. His
analysis &
solution looks
sound to me.<br
class="">
<br class="">
Regards,<br
class="">
Michael<br
class="">
<br class="">
<br class="">
<div class="">Am
06.06.21 um
14:50 schrieb
Mark
Webb-Johnson:<br
class="">
</div>
<blockquote
type="cite"
class="">
<div class=""><br
class="">
</div>
I spent quite
a bit of time
on this. With
my standard
test packet of
11 CAN frames
expected, and
the standard
driver, I get
perhaps 4 or 5
of them (about
half are lost,
and some are
out of order).
<div class=""><br
class="">
</div>
<div class="">I
made the
suggested
change to move
the MyCan.IncomingFrame() call out of the ‘can’ object (when
frameReceived
is true) to
within the
mcp2515 AsynchronousInterruptHandler itself. That allows the handler to
receive more
than one frame
per call and
is a very
simple change.
Once that is
done, we can
at least now
try to tune
it.</div>
<div class=""><br
class="">
</div>
<div class="">So
I then
modified the
code of
mcp2515 AsynchronousInterruptHandler
to loop so
long as the
interrupt flag
says either
buffer #0 or
#1 has a
frame. The
result looks
something like
this:</div>
<div class=""><br
class="">
</div>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<div class="">
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:14px"
class="">D
(63192)
mcp2515:
AsynchronousInterruptHandler
instat=01
errflag=00
txb0ctrl=00</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:14px"
class="">D
(63192)
mcp2515:
AsynchronousInterruptHandler
rx frame from
buffer #0 (ID
0x110 B1=54)</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:14px"
class="">D
(63192)
mcp2515:
AsynchronousInterruptHandler
instat=23
errflag=40
txb0ctrl=00</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:14px"
class="">D
(63192)
mcp2515:
AsynchronousInterruptHandler
rx frame from
buffer #0 (ID
0x110 B1=40)</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:14px"
class="">D
(63192)
mcp2515:
AsynchronousInterruptHandler
rx frame from
buffer #1 (ID
0x110 B1=45)</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:14px"
class="">D
(63192)
mcp2515:
AsynchronousInterruptHandler
Clear RX
buffer #0
overflow flag</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:14px"
class="">D
(63192)
mcp2515:
AsynchronousInterruptHandler
instat=23
errflag=00
txb0ctrl=00</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:14px"
class="">D
(63192)
mcp2515:
AsynchronousInterruptHandler
rx frame from
buffer #0 (ID
0x110 B1=24)</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:14px"
class="">D
(63192)
mcp2515:
AsynchronousInterruptHandler
rx frame from
buffer #1 (ID
0x110 B1=34)</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:14px"
class="">D
(63192)
mcp2515:
AsynchronousInterruptHandler
instat=20
errflag=00
txb0ctrl=00</span></font></div>
</div>
</blockquote>
<div class="">
<div class=""><br
class="">
</div>
<div class="">The
actual frames
on the bus are
(B1 values)
54, 45, 40,
0a, 7a, d5,
0c, 14, 1c,
24, 2c, and
34. Looking at
the above
debug output,
we get:</div>
<div class=""><br
class="">
</div>
<div class="">
<ul class="">
<li class="">Interrupt
flags show
buffer #0 has
a frame. It is
B1=54. Good.</li>
<li class="">Interrupt
flags show
buffers #0 and
#1 both have
frames. Buffer
#0 has B1=40
and buffer #1
has B1=45.</li>
<li class="">Etc
etc</li>
</ul>
</div>
<div class=""><br
class="">
</div>
<div class="">That
is not good.
What must have
happened is
that the first
B1=54 frame
arrived, got
put in buffer
#0, and
interrupt was
raised. We
checked the
interrupt
flags, found
buffer #0 had
something, and
read the frame
ok. All is
good. But what
is happening
now is that
between the
time we
checked the
interrupt
flags and the
time we
finished
reading the 13
bytes from
buffer #0, a
second frame
arrived and
was put in
buffer #1.
Then a third
frame arrives
and is put in
buffer #0. We
loop back to
check the
interrupt
flags and find
both buffers
have frames
ready. So we
ready buffer
#0 to get the
third frame,
then buffer #1
to get the
second frame.
We are out of
sequence.</div>
<div class=""><br
class="">
</div>
<div class="">By
removing the
ESP_LOGD
statements, I
can improve
performance
enough to get
10 out of the
11 frames, but
still
sometimes
frames are
swapped in
order.</div>
<div class=""><br
class="">
</div>
<div class="">By
over-clocking
the MCP2515
SPI bus
(supposed to
be 10MHz, but
I push it to
15MHz), I can
get all 11
frames, but
two are out of
order.</div>
<div class=""><br
class="">
</div>
<div class="">I
suppose I can
minimise the
chance of the
out-of-order
issue by
repeating the
call to read
interrupt
flags after
processing
buffer #0 but
before
checking for
buffer #1.
That would at
least reduce
the time
window to as
small as
possible, but
would be
another SPI
call and is
too slow.
Doing that
brings us back
to losing
frames.</div>
<div class=""><br
class="">
</div>
<div class="">Another
approach may
relate to our
current use of
the READ
command to
read 5 status
registers
(interrupt
flags, error
flags, two
skipped, then
transmit
buffer #0
flags). There
are two
specific
commands ‘read
status’ (which
gets the rx
and tx buffer
status flags
in one byte),
and ‘rx
status’ (which
gets just the
receive buffer
status and
some info on
the frames
received,
again in one
byte). I think
those are more
designed for
what we are
trying to do.
I can try to
optimise the
read loop at
the start of
the
AsynchronousInterruptHandler
to use one of
those - they
are 2 SPI
bytes vs 7 for
what we are
doing at the
moment (so
more than
three times as
fast).</div>
<div class=""><br
class="">
</div>
<div class="">I
think it will
also be
worthwhile
having a look
at some other
open source
mcp2515
drivers to see
how other
people are
doing it.</div>
<div class=""><br
class="">
</div>
<div class="">Regards,
Mark.</div>
<div class=""><br
class="">
<blockquote
type="cite"
class="">
<div class="">On
4 Jun 2021, at
3:02 PM, Mark
Webb-Johnson
<<a
href="mailto:mark@webb-johnson.net"
target="_blank" class="" moz-do-not-send="true">mark@webb-johnson.net</a>>
wrote:</div>
<br class="">
<div class="">
<div class="">
<div class="">
<div class="">Signed
PGP part</div>
<div class="">
<div
style="overflow-wrap:
break-word;"
class="">
<div class=""><br
class="">
</div>
The handler
can only
return one
frame. As it
is, if both
buffers #0 and
#1 have a
frame, it
returns #0. I
am not sure if
it gets called
again (seems
to depend on
the interrupt
gpio status).
<div class=""><br
class="">
</div>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<div class="">
<div class="">//
Read the
interrupt pin
status and if
it's still
active (low),
require
another
interrupt
handling
iteration</div>
<div class="">
return
!gpio_get_level((gpio_num_t)m_intpin);</div>
</div>
</blockquote>
<div class=""><br
class="">
</div>
<div class="">Maybe
a quick
solution is to
just return
true,
immediately
after *frameReceived=true,
if
intflag=0x01
and (intstat
&
CANINTF_RX1IF)?
That would
dispatch the
incoming
frame, then
call back for
more (from the
loop in the
can object).</div>
<div class=""><br
class="">
</div>
<div class="">I
am not sure in
general
why AsynchronousInterruptHandler
uses a bool
frameReceived
flag, and
doesn’t just
simply
dispatch the
frame
immediately to
the can
object? That
would simplify
things and
allow
the AsynchronousInterruptHandler
to handle
receiving both
frames in the
same call.
Given that
MCP2515 is the
only driver
using AsynchronousInterruptHandler,
that would be
an easy fix.</div>
<div class=""><br
class="">
</div>
<div class="">Regards,
Mark.</div>
<div class="">
<div class=""><br
class="">
<blockquote
type="cite"
class="">
<div class="">On
4 Jun 2021, at
2:29 PM,
Michael Balzer
<<a
href="mailto:dexter@expeedo.de"
target="_blank" class="" moz-do-not-send="true">dexter@expeedo.de</a>>
wrote:</div>
<br class="">
<div class="">
<div class="">
<div class="">
<div class="">Signed
PGP part</div>
<div class="">
<div class="">
Mark,<br
class="">
<br class="">
the handler is
meant to read
both buffers
sequentially,
and on a quick
glance I don't
see why it
wouldn't. But
it can't hurt
if you do an
audit of the
code.<br
class="">
<br class="">
I remember
having had
that
out-of-order
discussion
when handling
both RX
buffers before
here, but
don't remember
the outcome.
Too bad the
list archives
cannot be
searched.<br
class="">
<br class="">
I think it was
the MCP not
doing
overflows from
RX buffer 1 to
0. I.e. if
buffer 1 still
has a frame on
arrival, the
new frame will
be lost. That
means losing a
frame if the
handler cannot
react fast
enough, but
receiving out
of order would
be worse.<br
class="">
<br class="">
Regards,<br
class="">
Michael<br
class="">
<br class="">
<br class="">
<div class="">Am
04.06.21 um
04:16 schrieb
Mark
Webb-Johnson:<br
class="">
</div>
<blockquote
type="cite"
class="">
Michael,
<div class=""><br
class="">
</div>
<div class="">Good
suggestion on
the timing. I
think it best
to use the
same timings
as the Arduino
library, and
have committed
that change.
No vehicle
modules
currently use
1Mbps on
MCP2515
anyway.
Unfortunately,
it didn’t
resolve my
problem.</div>
<div class=""><br
class="">
</div>
<div class="">Looking
at the error
flags I see:</div>
<div class=""><br
class="">
</div>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<div class="">
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class="">Error
flag:
0x23401c01</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class=""><br
class="">
</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class="">intstat
0x23</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class="">
ERRIF Error
Interrupt
pending</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class="">
RX0IF Rx
buffer 0 full
interrupt</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class="">
RX1IF Rx
buffer 1 full
interrupt</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class=""><br
class="">
</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class="">errflag
0x40</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class="">
RX0OVR Rx
buffer 0
overflow</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class=""><br
class="">
</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class="">intflag
0x1c01</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class="">
0x01 Implied
from Rx buffer
0 full</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class=""><br
class="">
</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class="">
0x1c = 0001
1100</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class="">
Means RXB0
overflow. No
data lost in
this case (it
went into
RXB1)</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class="">
Means
(errflag &
EFLG_RX01OVR),
clear RX
buffer
overflow flags</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal;font-size:12px"
class="">
Means
(intstat &
(CANINTF_MERRF
|
CANINTF_WAKIF
|
CANINTF_ERRIF)),
clear error
& wakeup
interrupts</span></font></div>
</div>
</blockquote>
<div class=""><br
class="">
</div>
<div class="">So
we have CAN
frames in BOTH
rx buffers #0
and #1.
Looking at our
driver code
(mcp2515::AsynchronousInterruptHandler),
it seems in
that case we
only read from
buffer #0.
From the flow
I can see, we
are going to
lose that
second frame.
We’re not
really
handling the
issue of two
frames being
in the buffers
when the
interrupt
handler is
called.</div>
<div class=""><br
class="">
</div>
<div class="">As
the
architecture
of <span
class="">mcp2515::AsynchronousInterruptHandler
can only
receive one
frame, it is
not so simple
to fix. We
could simply
read and
return the
frame in
buffer #0,
requesting to
be called
again (return
true), but
another frame
may arrive
(into buffer
#0) before we
get called
again, and
that is going
to result in
out-of-order
frames.</span></div>
<div class=""><span
class=""><br
class="">
</span></div>
<div class="">I’ll
work on
improving the
handling of
this case.</div>
<div class=""><br
class="">
</div>
<div class="">Regards,
Mark.</div>
<div class="">
<div class=""><br
class="">
<blockquote
type="cite"
class="">
<div class="">On
3 Jun 2021, at
3:07 PM,
Michael Balzer
<<a
href="mailto:dexter@expeedo.de"
target="_blank" class="" moz-do-not-send="true">dexter@expeedo.de</a>>
wrote:</div>
<br class="">
<div class="">
<div class="">
<div class="">
<div class="">Signed
PGP part</div>
<div class="">
<div class="">
Mark,<br
class="">
<br class="">
I'd give the
bit timing a
try first, the
MCP2515 seems
to be very
sensitive for
this. I've
even had some
trouble
finding a
working
configuration
for the 50
kbit timing
I've added a
couple weeks
ago.<br
class="">
<br class="">
We currently
use 00 / D0 /
82 which is
also the
result of the
old Intrepid
timing
calculator.
That's a
propagation
segment of 1
Tq and 3 Tq
per phase,
resulting in
samling
between 50% -
62.5%.<br
class="">
<br class="">
The Arduino
MCP CAN lib by
Cory Fowler
also had this
previously,
but then
changed in…<br
class="">
<br class="">
<a
href="https://github.com/coryjfowler/MCP_CAN_lib/commit/ece730cf697fef1cbe8a90111694868168d41000"
target="_blank" class="" moz-do-not-send="true">https://github.com/coryjfowler/MCP_CAN_lib/commit/ece730cf697fef1cbe8a90111694868168d41000</a><br
class="">
<br class="">
…to 00 / CA /
81, which is a
propagation
segment of 3
Tq and 2 Tq
per phase,
shifting the
sampling
window to 62.5
- 75%.<br
class="">
<br class="">
Our current
configuration
scheme for the
internal
SJA1000
compatible CAN
seems to
sample at 62.5
- 75% as well,
so that would
also match.<br
class="">
<br class="">
Regards,<br
class="">
Michael<br
class="">
<br class="">
<br class="">
<div class="">Am
03.06.21 um
07:36 schrieb
Mark
Webb-Johnson:<br
class="">
</div>
<blockquote
type="cite"
class="">
<div class=""><br
class="">
</div>
<div class="">I’m
working on an
implementation
of IP stack
over CAN for
the Tesla
Roadster. IP
frames are
encoded as a
length
followed by a
sequence of
CAN frames,
all on the
same ID. This
runs over a
1MHz bus, so
presumably the
traffic volume
could be high
at times.</div>
<div class=""><br
class="">
</div>
<div class="">I
was having
problems with
this running
on CAN2, so
tried CAN1 and
it worked
perfectly.
Here are some
simple dumps
of a single
PING packet
(and single
PING response
packet):</div>
<div class=""><br
class="">
</div>
<div class="">ID
#111 is used
to transmit an
IP packet, and
ID #110 is
used to
receive an IP
packet. The
special empty
data frame is
an
acknowledgment.</div>
<div class=""><br
class="">
</div>
<div class="">Using
latest master
branch code
(3.2.016-196-g0aad1a9f/ota_1/edge
(build idf
v3.3.4-848-g1ff5e24b1
Jun 2 2021
09:28:58)).</div>
<div class=""><br
class="">
</div>
<div class="">So,
first let’s
test with
traffic on
CAN1 (active,
1Mbps), and
listening on
CAN2 (listen,
1Mbps):</div>
<div class=""><br
class="">
</div>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class="">TCPDUMP:</span></font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class=""><br
class="">
</span></font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><span style="font-family:"Andale
Mono""
class="">05:57:55.980291
IP (tos 0x0,
ttl 64, id
43101, offset
0, flags [DF],
proto ICMP
(1), length
84)</span></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class="">
10.10.99.3
> <a
href="http://10.10.99.2/"
target="_blank" class="" moz-do-not-send="true">10.10.99.2</a>: ICMP
echo request,
id 23372, seq
1, length 64</span></font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class=""><span style="white-space:pre-wrap" class=""> </span>0x0000:
4500 0054
a85d 4000 4001
b832 0a0a 6303
<a
href="mailto:E..T.]@.@..2..c"
target="_blank" class="" moz-do-not-send="true">E..T.]@.@..2..c</a>.</span></font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class=""><span style="white-space:pre-wrap" class=""> </span>0x0010:
0a0a 6302
0800 7df8 5b4c
0001 5361 b860
..c...}.[L..Sa.`</span></font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class=""><span style="white-space:pre-wrap" class=""> </span>0x0020:
19f5 0e00
0809 0a0b 0c0d
0e0f 1011 1213
................</span></font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class=""><span style="white-space:pre-wrap" class=""> </span>0x0030:
1415 1617
1819 1a1b 1c1d
1e1f 2021 2223
.............!"#</span></font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class=""><span style="white-space:pre-wrap" class=""> </span>0x0040:
2425 2627
2829 2a2b 2c2d
2e2f 3031 3233
$%&'()*+,-./0123</span></font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class=""><span style="white-space:pre-wrap" class=""> </span>0x0050:
3435 3637
4567</span></font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class=""><br
class="">
</span></font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class="">05:57:56.436190
IP (tos 0x0,
ttl 64, id
14937, offset
0, flags
[none], proto
ICMP (1),
length 84)</span></font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class="">
10.10.99.2
> <a
href="http://10.10.99.3/"
target="_blank" class="" moz-do-not-send="true">10.10.99.3</a>: ICMP
echo reply, id
23372, seq 1,
length 64</span></font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class=""><span style="white-space:pre-wrap" class=""> </span>0x0000:
4500 0054
3a59 0000 4001
6637 0a0a 6302
<a
href="mailto:E..T:Y..@.f7..c"
target="_blank" class="" moz-do-not-send="true">E..T:Y..@.f7..c</a>.</span></font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class=""><span style="white-space:pre-wrap" class=""> </span>0x0010:
0a0a 6303
0000 85f8 5b4c
0001 5361 b860
..c.....[L..Sa.`</span></font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class=""><span style="white-space:pre-wrap" class=""> </span>0x0020:
19f5 0e00
0809 0a0b 0c0d
0e0f 1011 1213
................</span></font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class=""><span style="white-space:pre-wrap" class=""> </span>0x0030:
1415 1617
1819 1a1b 1c1d
1e1f 2021 2223
.............!"#</span></font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class=""><span style="white-space:pre-wrap" class=""> </span>0x0040:
2425 2627
2829 2a2b 2c2d
2e2f 3031 3233
$%&'()*+,-./0123</span></font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class=""><span style="white-space:pre-wrap" class=""> </span>0x0050:
3435 3637
4567</span></font></blockquote>
<font class=""
face="Andale
Mono"><span
style="font-style:normal"
class=""><br
class="">
</span></font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class="">Traffic
(as shown on
PC the other
end of the can
log tcp
connection):</span></font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
style="font-style:normal"
class=""><br
class="">
</span></font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 54 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 45 00 00 54 a8 5d 40 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 40 01 b8 32 0a 0a 63 03</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 0a 0a 63 02 08 00 7d f8</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 5b 4c 00 01 53 61 b8 60</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 19 f5 0e 00 08 09 0a 0b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 0c 0d 0e 0f 10 11 12 13</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 14 15 16 17 18 19 1a 1b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 1c 1d 1e 1f 20 21 22 23</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 24 25 26 27 28 29 2a 2b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 2c 2d 2e 2f 30 31 32 33</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 34 35 36 37</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><br class="">
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 54 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 45 00 00 54 3a 59 00 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 40 01 66 37 0a 0a 63 02</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 0a 0a 63 03 00 00 85 f8</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 5b 4c 00 01 53 61 b8 60</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 19 f5 0e 00 08 09 0a 0b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 0c 0d 0e 0f 10 11 12 13</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 14 15 16 17 18 19 1a 1b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 1c 1d 1e 1f 20 21 22 23</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 24 25 26 27 28 29 2a 2b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 2c 2d 2e 2f 30 31 32 33</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 34 35 36 37</blockquote>
<br class="">
</font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono">CAN1
active:</font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><br
class="">
</font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1T11 111 54 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1R11 110</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><br class="">
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1CER TX_Queue T11 111 40 01 b8 32 0a 0a 63 03</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1T11 111 45 00 00 54 a8 5d 40 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1T11 111 40 01 b8 32 0a 0a 63 03</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1CER TX_Queue T11 111 5b 4c 00 01 53 61 b8 60</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1T11 111 0a 0a 63 02 08 00 7d f8</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1T11 111 5b 4c 00 01 53 61 b8 60</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1CER TX_Queue T11 111 0c 0d 0e 0f 10 11 12 13</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1T11 111 19 f5 0e 00 08 09 0a 0b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1T11 111 0c 0d 0e 0f 10 11 12 13</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1CER TX_Queue T11 111 1c 1d 1e 1f 20 21 22 23</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1T11 111 14 15 16 17 18 19 1a 1b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1T11 111 1c 1d 1e 1f 20 21 22 23</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1CER TX_Queue T11 111 2c 2d 2e 2f 30 31 32 33</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1T11 111 24 25 26 27 28 29 2a 2b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1T11 111 2c 2d 2e 2f 30 31 32 33</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1T11 111 34 35 36 37</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><br class="">
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1R11 110 54 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1R11 110 45 00 00 54 3a 59 00 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1R11 110 40 01 66 37 0a 0a 63 02</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1R11 110 0a 0a 63 03 00 00 85 f8</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1R11 110 5b 4c 00 01 53 61 b8 60</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1R11 110 19 f5 0e 00 08 09 0a 0b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1R11 110 0c 0d 0e 0f 10 11 12 13</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1R11 110 14 15 16 17 18 19 1a 1b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1R11 110 1c 1d 1e 1f 20 21 22 23</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1R11 110 24 25 26 27 28 29 2a 2b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1R11 110 2c 2d 2e 2f 30 31 32 33</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">1R11 110 34 35 36 37</blockquote>
<br class="">
</font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono">CAN2
listen:</font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><br
class="">
</font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 111 54 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 110</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><br class="">
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 111 45 00 00 54 a8 5d 40 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 111 40 01 b8 32 0a 0a 63 03</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 111 0a 0a 63 02 08 00 7d f8</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 111 5b 4c 00 01 53 61 b8 60</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 111 19 f5 0e 00 08 09 0a 0b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 111 0c 0d 0e 0f 10 11 12 13</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 111 14 15 16 17 18 19 1a 1b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 111 1c 1d 1e 1f 20 21 22 23</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 111 24 25 26 27 28 29 2a 2b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 111 2c 2d 2e 2f 30 31 32 33</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 111 34 35 36 37</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><br class="">
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 110 54 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2CER Error intr=10 rxpkt=14 txpkt=0
errflags=0x23401c01
rxerr=0
txerr=0
rxinval=0
rxovr=0
txovr=0
txdelay=0
txfail=0
wdgreset=0
errreset=0</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 110 40 01 66 37 0a 0a 63 02</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 110 19 f5 0e 00 08 09 0a 0b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 110 34 35 36 37</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 110 45 00 00 54 3a 59 00 00</blockquote>
</font></blockquote>
</blockquote>
<div class=""><br
class="">
</div>
<div class="">Conclusion
is that the
CAN1 traffic
looks fine,
and the PING
packet gets a
good reply.
All
successful.
But the CAN2
listen is
missing a few
packets and
the last
packet is out
of order.</div>
<div class=""><br
class="">
</div>
<div class="">Now,
let’s test
with traffic
on CAN2
(active,
1Mbps), and
listening on
CAN1 (listen,
1Mbps):</div>
<div class=""><br
class="">
</div>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<div class=""><font
class=""
face="Andale
Mono">TCPDUMP:</font></div>
<div class=""><font
class=""
face="Andale
Mono"><br
class="">
</font></div>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<div class=""><font
class=""
face="Andale
Mono"><span
class="">
<div class="">06:00:33.004060
IP (tos 0x0,
ttl 64, id
58240, offset
0, flags [DF],
proto ICMP
(1), length
84)</div>
</span></font></div>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
class="">
<div class="">
10.10.99.3
> <a
href="http://10.10.99.2/"
target="_blank" class="" moz-do-not-send="true">10.10.99.2</a>: ICMP
echo request,
id 23393, seq
1, length 64</div>
</span></font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
class="">
<div class=""><span style="white-space:pre-wrap" class=""> </span>0x0000:
4500 0054
e380 4000 4001
7d0f 0a0a 6303
<a
href="mailto:E..T..@.@"
target="_blank" class="" moz-do-not-send="true">E..T..@.@</a>.}...c.</div>
</span></font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
class="">
<div class=""><span style="white-space:pre-wrap" class=""> </span>0x0010:
0a0a 6302
0800 7cc8 5b61
0001 f161 b860
..c...|.[a...a.`</div>
</span></font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
class="">
<div class=""><span style="white-space:pre-wrap" class=""> </span>0x0020:
8b0f 0000
0809 0a0b 0c0d
0e0f 1011 1213
................</div>
</span></font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
class="">
<div class=""><span style="white-space:pre-wrap" class=""> </span>0x0030:
1415 1617
1819 1a1b 1c1d
1e1f 2021 2223
.............!"#</div>
</span></font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
class="">
<div class=""><span style="white-space:pre-wrap" class=""> </span>0x0040:
2425 2627
2829 2a2b 2c2d
2e2f 3031 3233
$%&'()*+,-./0123</div>
</span></font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><span
class="">
<div class=""><span style="white-space:pre-wrap" class=""> </span>0x0050:
3435 3637
4567</div>
</span></font></blockquote>
<font class=""
face="Andale
Mono"><span
class=""><br
class="">
</span></font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono">Traffic (as
shown on PC
the other end
of the can log
tcp
connection):</font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><br
class="">
</font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 54 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 45 00 00 54 e3 80 40 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 40 01 7d 0f 0a 0a 63 03</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 0a 0a 63 02 08 00 7c c8</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 5b 61 00 01 f1 61 b8 60</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 8b 0f 00 00 08 09 0a 0b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 0c 0d 0e 0f 10 11 12 13</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 14 15 16 17 18 19 1a 1b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 1c 1d 1e 1f 20 21 22 23</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 24 25 26 27 28 29 2a 2b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 2c 2d 2e 2f 30 31 32 33</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">tx: #111 34 35 36 37</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><br class="">
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 54 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 45 00 00 54 3a 5a 00 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 0a 0a 63 03 00 00 84 c8</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 8b 0f 00 00 08 09 0a 0b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 34 35 36 37</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">rx: #110 40 01 66 36 0a 0a 63 02</blockquote>
</font></blockquote>
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><br
class="">
</font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono">CAN2
active:</font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><br
class="">
</font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2T11 111 54 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 110</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><br class="">
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2CER TX_Queue T11 111 40 01 7d 0f 0a 0a 63 03</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2T11 111 45 00 00 54 e3 80 40 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2T11 111 40 01 7d 0f 0a 0a 63 03</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2CER TX_Queue T11 111 5b 61 00 01 f1 61 b8 60</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2T11 111 0a 0a 63 02 08 00 7c c8</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2T11 111 5b 61 00 01 f1 61 b8 60</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2CER TX_Queue T11 111 0c 0d 0e 0f 10 11 12 13</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2T11 111 8b 0f 00 00 08 09 0a 0b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2T11 111 0c 0d 0e 0f 10 11 12 13</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2CER TX_Queue T11 111 1c 1d 1e 1f 20 21 22 23</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2T11 111 14 15 16 17 18 19 1a 1b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2T11 111 1c 1d 1e 1f 20 21 22 23</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2CER TX_Queue T11 111 2c 2d 2e 2f 30 31 32 33</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2T11 111 24 25 26 27 28 29 2a 2b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2T11 111 2c 2d 2e 2f 30 31 32 33</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2T11 111 34 35 36 37</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><br class="">
</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 110 54 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 110 45 00 00 54 3a 5a 00 00</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2CER Error intr=15 rxpkt=3 txpkt=12
errflags=0x23401c01
rxerr=0
txerr=0
rxinval=0
rxovr=0
txovr=0
txdelay=5
txfail=0
wdgreset=0
errreset=0</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 110 0a 0a 63 03 00 00 84 c8</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 110 8b 0f 00 00 08 09 0a 0b</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 110 34 35 36 37</blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">2R11 110 40 01 66 36 0a 0a 63 02</blockquote>
<br class="">
</font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono">CAN1
listen:</font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><br
class="">
</font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono">1R11 111 54
00<br class="">
1R11 110</font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><br
class="">
1R11 111 45 00
00 54 e3 80 40
00<br class="">
1R11 111 40 01
7d 0f 0a 0a 63
03<br class="">
1R11 111 0a 0a
63 02 08 00 7c
c8<br class="">
1R11 111 5b 61
00 01 f1 61 b8
60<br class="">
1R11 111 8b 0f
00 00 08 09 0a
0b<br class="">
1R11 111 0c 0d
0e 0f 10 11 12
13<br class="">
1R11 111 14 15
16 17 18 19 1a
1b<br class="">
1R11 111 1c 1d
1e 1f 20 21 22
23<br class="">
1R11 111 24 25
26 27 28 29 2a
2b<br class="">
1R11 111 2c 2d
2e 2f 30 31 32
33<br class="">
1R11 111 34 35
36 37</font></blockquote>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class=""><font class="" face="Andale Mono"><br
class="">
1R11 110 54 00<br
class="">
1R11 110 45 00
00 54 3a 5a 00
00<br class="">
1R11 110 40 01
66 36 0a 0a 63
02<br class="">
1R11 110 0a 0a
63 03 00 00 84
c8<br class="">
1R11 110 5b 61
00 01 f1 61 b8
60<br class="">
1R11 110 8b 0f
00 00 08 09 0a
0b<br class="">
1R11 110 0c 0d
0e 0f 10 11 12
13<br class="">
1R11 110 14 15
16 17 18 19 1a
1b<br class="">
1R11 110 1c 1d
1e 1f 20 21 22
23<br class="">
1R11 110 24 25
26 27 28 29 2a
2b<br class="">
1R11 110 2c 2d
2e 2f 30 31 32
33<br class="">
1R11 110 34 35
36 37</font></blockquote>
</blockquote>
<div class=""><br
class="">
</div>
<div class="">Conclusion
is that the
CAN2 transmit
traffic looks
fine, but no
PING reply
received via
CAN. The CAN1
listen shows
the reply just
fine.</div>
<div class=""><br
class="">
</div>
<div class="">Here
is that last
CAN1 listen,
with
timestamps:</div>
<div class=""><br
class="">
</div>
<blockquote
style="margin:0px
0px 0px
40px;border:medium
none;padding:0px" class="">
<div class="">
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal"
class="">1622696433.080107
1R11 111 54 00</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal"
class="">1622696433.081657
1R11 110</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal"
class=""><br
class="">
</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal"
class="">1622696433.227479
1R11 111 45 00
00 54 e3 80 40
00</span></font></div>
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class=""
face="Andale
Mono"><span
style="font-style:normal"
class="">1622696433.228318
1R11 111 40 01
7d 0f 0a 0a 63
03</span></font></div>
<div class=""><font
class=""
face="Andale
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style="font-style:normal"
class="">1622696433.245727
1R11 111 0a 0a
63 02 08 00 7c
c8</span></font></div>
<div class=""><font
class=""
face="Andale
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style="font-style:normal"
class="">1622696433.246214
1R11 111 5b 61
00 01 f1 61 b8
60</span></font></div>
<div class=""><font
class=""
face="Andale
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style="font-style:normal"
class="">1622696433.248219
1R11 111 8b 0f
00 00 08 09 0a
0b</span></font></div>
<div class=""><font
class=""
face="Andale
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style="font-style:normal"
class="">1622696433.248772
1R11 111 0c 0d
0e 0f 10 11 12
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<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal"
class="">1622696433.250774
1R11 111 14 15
16 17 18 19 1a
1b</span></font></div>
<div class=""><font
class=""
face="Andale
Mono"><span
style="font-style:normal"
class="">1622696433.251338
1R11 111 1c 1d
1e 1f 20 21 22
23</span></font></div>
<div class=""><font
class=""
face="Andale
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style="font-style:normal"
class="">1622696433.253380
1R11 111 24 25
26 27 28 29 2a
2b</span></font></div>
<div class=""><font
class=""
face="Andale
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style="font-style:normal"
class="">1622696433.253944
1R11 111 2c 2d
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33</span></font></div>
<div class=""><font
class=""
face="Andale
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style="font-style:normal"
class="">1622696433.265937
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36 37</span></font></div>
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class=""
face="Andale
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style="font-style:normal"
class=""><br
class="">
</span></font></div>
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style="font-style:normal"
class="">1622696433.269221
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class=""
face="Andale
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style="font-style:normal"
class="">1622696433.272095
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00</span></font></div>
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class=""
face="Andale
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style="font-style:normal"
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02</span></font></div>
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class=""
face="Andale
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style="font-style:normal"
class="">1622696433.272156
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class=""
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style="font-style:normal"
class="">1622696433.272193
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class=""
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style="font-style:normal"
class="">1622696433.272245
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class=""
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style="font-style:normal"
class="">1622696433.272277
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style="font-style:normal"
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class=""
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style="font-style:normal"
class="">1622696433.272354
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23</span></font></div>
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class=""
face="Andale
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style="font-style:normal"
class="">1622696433.272387
1R11 110 24 25
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2b</span></font></div>
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class=""
face="Andale
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style="font-style:normal"
class="">1622696433.272420
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class=""
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style="font-style:normal"
class="">1622696433.272452
1R11 110 34 35
36 37</span></font></div>
</div>
</blockquote>
<div class=""><br
class="">
</div>
<div class="">It
is 1Mbps, with
30us or so
between each
packet. This
is the <b
class="">only</b>
traffic on the
bus.
Everything
else is turned
off. Roughly
12 packets
each way.
Surely even if
we were
hitting a
performance
limit, our
buffers can
handle 12
packets?</div>
<div class=""><br
class="">
</div>
<div class="">The
good news is
that I have a
good
environment to
replicate this
issue now, so
any fix should
be easy to
test.</div>
<div class=""><br
class="">
</div>
<div class="">I
haven’t worked
on the MCP2515
driver in our
code in a long
time, but it
certainly
seems
something is
messed up and
that could be
badly
affecting
vehicle
modules using
anything other
than CAN1.</div>
<div class=""><br
class="">
</div>
<div class="">I
will start to
look at this
over the
weekend, but
has anyone got
any
ideas/suggestions?
Perhaps the
bit timing
registers are
off by a small
amount (so it
works on CAN1
but not on
CAN2)? Or
something more
serious in our
driver?</div>
<div class=""><br
class="">
</div>
<div class="">Regards,
Mark.</div>
<div class=""><br
class="">
</div>
<br class="">
<fieldset
class=""></fieldset>
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<br class="">
<pre cols="72" class="">--
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26</pre>
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<pre cols="72" class="">--
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26</pre>
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<pre cols="72" class="">--
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26</pre>
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