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Discussion Groups | 68HC12 | Re: Re: Re: problem regarding Succesful Transmission of CAN message
Join our technical discussions about Freescale Microcontrollers: M68HC12. (Freescale Semiconductor is a Subsidiary of Motorola).
Re: Re: Re: problem regarding Succesful Transmission of CAN message - Edward Karpicz - Mar 27 3:06:07 2009
> Thanks,Edward!
> Is there any situation that MSCAN aborts current transmitting without
> application abort request?
No. MSCAN won't about anything without request.
> If MSCAN keep retrying transmitting, but there is no any ack, what will
> happen later? error interrupt to inform application?
Error counters may increment, bus-off may happen. But it all should self-fix
and marked to send Tx buffers will be transmitted after bus issues
disappear. MSCAN will try again and again. Of course application should
workaound possible timing issues; if delivery is critical, then app should
track change of error status and provide necessary workarounds.
Edward
> wrote:
>>
>>> how application knows when arbitration lost? will msCAN retry later?
>>> thanks!
>>
>>Yes MSCAN will retry later. It will keep retrying until message is send
>>and
>>acked by other nodes.
>>
>>>
>>> helo everybody
>>> >
>>> > i am working on S12MSCAN-v2....for data transmission
>>> > between any test equipment and an ECU...the Microcontroller I am
>>> > using in the using ECU is MC9S12D64..
>>> >
>>> > i have a question regarding this....
>>> >
>>> > how can we know that the CAN transmission is
>>> > completed...instead of cheking the MSCAN transmitter register
>>> > (CAN0TFLG (TXE))..
>>
>>Why checking TXE doesn't suit you?
>>
>>> >
>>> > how can we check the status of the CAN bus..i.e., when we
>>> > send a data to the Data segement register....CANTFLG will be set to 1
>>> > automatically stating that the transmitter buffer is empty that
>>> > means the transmission is completed succesfully..but how can we know
>>> > about the successful transmission if the CAN Bus is Open or any error
>>> > occured in the CAN bus...please provide the sample code for this if u
>>> > have...
>>
>>To check if bus is OK, you should configure RSTATEx, TSTATEx bits in
>>CANRIER
>>register. Then you should monitor CSCIF flag. RSTATx (no E in bit name),
>>TSTATx flags are updated only when CSCIF is cleared. So every time error
>>status changes (CSCIF=1), you read error status flags RSTATx, TSTATx and
>>clear CSCIF by writing one to it.
>>
>>Edward
>>
>>> > it will help me alot..
>>> > thanks and regards
>>> > Yadunandan
>>> ------------------------------------
> ------------------------------------
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> Is there any situation that MSCAN aborts current transmitting without
> application abort request?
No. MSCAN won't about anything without request.
> If MSCAN keep retrying transmitting, but there is no any ack, what will
> happen later? error interrupt to inform application?
Error counters may increment, bus-off may happen. But it all should self-fix
and marked to send Tx buffers will be transmitted after bus issues
disappear. MSCAN will try again and again. Of course application should
workaound possible timing issues; if delivery is critical, then app should
track change of error status and provide necessary workarounds.
Edward
> wrote:
>>
>>> how application knows when arbitration lost? will msCAN retry later?
>>> thanks!
>>
>>Yes MSCAN will retry later. It will keep retrying until message is send
>>and
>>acked by other nodes.
>>
>>>
>>> helo everybody
>>> >
>>> > i am working on S12MSCAN-v2....for data transmission
>>> > between any test equipment and an ECU...the Microcontroller I am
>>> > using in the using ECU is MC9S12D64..
>>> >
>>> > i have a question regarding this....
>>> >
>>> > how can we know that the CAN transmission is
>>> > completed...instead of cheking the MSCAN transmitter register
>>> > (CAN0TFLG (TXE))..
>>
>>Why checking TXE doesn't suit you?
>>
>>> >
>>> > how can we check the status of the CAN bus..i.e., when we
>>> > send a data to the Data segement register....CANTFLG will be set to 1
>>> > automatically stating that the transmitter buffer is empty that
>>> > means the transmission is completed succesfully..but how can we know
>>> > about the successful transmission if the CAN Bus is Open or any error
>>> > occured in the CAN bus...please provide the sample code for this if u
>>> > have...
>>
>>To check if bus is OK, you should configure RSTATEx, TSTATEx bits in
>>CANRIER
>>register. Then you should monitor CSCIF flag. RSTATx (no E in bit name),
>>TSTATx flags are updated only when CSCIF is cleared. So every time error
>>status changes (CSCIF=1), you read error status flags RSTATx, TSTATx and
>>clear CSCIF by writing one to it.
>>
>>Edward
>>
>>> > it will help me alot..
>>> > thanks and regards
>>> > Yadunandan
>>> ------------------------------------
> ------------------------------------
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