• State Not Answered
  • Locked Locked
  • Replies 3 replies
  • Subscribers 22 subscribers
  • Views 1052 views
  • Users 0 members are here
Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Problems reading CAN Controller LEC in Infineon XC164CI

Andreas Lins

Hello!

In an application I have the problem of reading the contents of the TwinCAN Controller A Status Register.
Below you will see a code snipped and what the compiler creates out of it:

773:  mem=CAN_ASR;
00010C5A D7408000  EXTP     #0x0080,#1
00010C5E F2F40402  MOV      R4,DPP0:0x0204
00010C62 E4801E00  MOVB     [R0+#0x001E],RL4

mem is an integer variable, so the compiler seems to correctly move just the lower byte into the variable itself

If I unplug the CAN, the CAN_ASR is updated with the value 0x00EB, which I can see in the Peripherals and Memory Window of µVision2 when I come to the code position shown above. But when I do a single step in the code, R4 is not updated with this value. It will have 0x00E8 as contents. The lower 3 bits, which represents the LEC are missing!!
Has anybody already had problems with this??

Andreas

Parents
  • 0 in reply to Andreas Lins

    The ASR is telling you that you are in a bus off state. The LEC will no longer be updated since the bus is disconnected.

    Is your software making use of the Error Interrupt or the Status Change Interrupt?

    An Ack Error will not cause you to go bus-off. So you need to first track down the reason for the bus-off.

Reply
  • 0 in reply to Andreas Lins

    The ASR is telling you that you are in a bus off state. The LEC will no longer be updated since the bus is disconnected.

    Is your software making use of the Error Interrupt or the Status Change Interrupt?

    An Ack Error will not cause you to go bus-off. So you need to first track down the reason for the bus-off.

Children
No data