Timestamp of periodic frames on CANalyzer.
- From: Achilles <akhil.misra@xxxxxxxxx>
- Date: 23 Apr 2007 05:24:29 -0700
Hi All,
I have written a CAN driver for star12 controller. And I do have some
periodic frames for transmission. I am using not any commercial RTOS
but I do have created my own scheduler for the scheduling different
tasks. I am using a debugger for software download & debugging and I
am also using vector CANalyzer for monitoring the CAN frames on the
bus. Now the problem which I am facing is as below.
Scenario 1: I run my CANalyser, and I power on my ECU, I am observing
the periodic frames appearing on the CAN bus (CANalyzer trace window)
with correct periodicty and everything works fine.
Scenario 2: I Power on my ECU and then I run my CANalyzer. Now for
initial few periodic frames, I am not receiving them at correct
periodicity but after sometime the periodicity becomes correct and the
communication is proper. I dont get any error frame too.
Can anyone explain me the IInd scenario, why I am seeing this kind of
behavior on CANalyzer trace window?
My initial guess was that there may be message buffer on the CANalyzer
which stores few messages and then suddenly when I start the
CANalyser, it throws out all the message and display the timestamp of
priniting the messages, not the timestamp of message reception.
Please help me in this regard.
Thanks in advance
Regards
AKhilesh
.
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