Thanks Alan,
I can see that a timeout/retry in detail would be hardware dependent.
But in the absence of "something," code can send a message, but have no
idea that it hasn't actually been sent, then try and close the "file"
and the thread will hang indefinitely. I think we need something that
reports the fail so some kind of recovery/reset can be attempted?
Perhaps the "close" could be wrapped with something to deal with this?
Or the open mode needs to be different somehow?
POSIX/Linux type programming is new to me, after decades of bare-metal
type software dev where I'm in total control albeit unique to a
given/chosen processor, so any suggestions would be very welcome.
On 09/08/2023 19:56, Alan C. Assis wrote:
Hi Tim,
I think that the default behavior of CAN Controller is trying to send
indefinitely a message, some HW can define some retry limit.
Please take a look:
https://forum.pjrc.com/threads/67435-FlexCAN-Infinite-Endless-TX-Retries
So, I'm not sure if it will make sense to implement a CAN TX timeout
on NuttX side, since this behavior could be HW dependent.
BR,
Alan
On 8/9/23, Tim Hardisty<t...@jti.uk.com.invalid> wrote:
I am now cracking on with the app for my custom board, and in parallel
writing a production board-test app.
In trying to cover potential board faults, I have found that if there's
something that prevents a CAN message reaching an endpoint/destination,
the CAN transmitter (of course, as I understand it) is continuously
retrying the message send, meaning the test app hangs when you try and
close the file once the test has been deemed to fail. That is "by
design" in the higher (i.e. non-arch specific) can code as it waits for
the TX FIFO/queue to empty until the close is allowed.
What is the correct POSIX way to handle this error condition?
Might it be better to use Socket CAN, for example, assuming it has
better error handling by design, or is the NuttX CAN "system"
fundamentally missing something to handle this (or, more likely, I've
just missed it )?
--
Regards,
Tim Hardisty
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