an interesting CAN driver issue

Hello All,

from past few days I was facing an intersting prob with CAN driver
implementation. I was using the Star12 Xgate processor. The CAN driver
was initialized properly and it was working with vector CAN Card XL.
The frames transmitted from the CAN controller were seen on the
Oscilloscope and the frames were appearing on the CANAlyzer Trace
window properly. Everything worked perfectly fine.
But when I replaced the vector CAN Card XL with CAN Card X, the frames
stopped appearing on the trace window. But they were present on the
CAN bus, I could verify the same with an oscilloscope. The code
downloaded on the ECU was same as it was in case of CANCardXL.

after so much debugging I found that the DLC register was creating the
problem. I wanted to transmit always an 8 bytes long frame. I was
putting the value of dlc as -->> DLC_Reg |= 0x08;
with this the frames were observed on the CAN CardXL. but not with CAN
Card X.

When I changed the implementation to -->> DLC_Reg |= 0x08; The CAN
Card X also worked fine. All frames started appearing on the CANalyzer
trace window.

In both the cases, there were no error frames, no error counter
increament, CANalyzer bus statistics window also showed the standard
data frames increamenting on the bus.

So can any one of you please point out the DLC value was responsible
for the frame reception on the CANalyzer trace window.

The same frame was not seen on CANCardX but on CANCardXL, it was
visible and in both the cases the oscilloscope was showing the frame
on the bus.

Please provide your feedback in understanding the root cause of the
problem.

Regards
Akhilesh

.

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