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Discussion Groups | 68HC12 | CAN Transmission not working

Join our technical discussions about Freescale Microcontrollers: M68HC12. (Freescale Semiconductor is a Subsidiary of Motorola).

CAN Transmission not working - Manjunath - May 13 5:07:00 2003

Hello,
Can Anybody tell how to test the CAN Protocol Transmission.
I am using HCS12 of D family and the CAN transciever is of Philips.
I am not getting any pulses on the TXCAN0 of HCS12.
Can anybody tell me Please

Thanks,
With Regards,

Manjunatha T.R.

E-mail : ---------------------------------





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RE: CAN Transmission not working - Dirk Lill - May 13 7:35:00 2003

Hello,

if the receiver does not recognize valid CAN frames, analyzing tools, like
vector's CANalyzer (http://www.vector-informatik.de/english/), do a good
job.
But if the HCS12 does not send any signal to the bus, please check the
setting of the MODRR register in the Port Integration Module, which is
responsible for the mapping of CAN0 (PTM pins or even PTJ on HCS12DJ64).
Another possible bug might be the LISTEN bit set in CANCTL1 register, which
causes the module not to send any answer but to receive the frames
correctly. These are just a few ideas, for further debugging, you should
provide the initialization code and information about the derivative
(MC9S12D64?).

Best regards,
Dirk -----Original Message-----
From: Manjunath [mailto:]
Sent: Tuesday, May 13, 2003 12:07 PM
To:
Subject: [68HC12] CAN Transmission not working Hello,
Can Anybody tell how to test the CAN Protocol Transmission.
I am using HCS12 of D family and the CAN transciever is of Philips.
I am not getting any pulses on the TXCAN0 of HCS12.
Can anybody tell me Please

Thanks,
With Regards,

Manjunatha T.R.

E-mail : ---------------------------------

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http://www.motorola.com/mcu





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RE: CAN Transmission not working - Manjunath - May 13 11:18:00 2003

Hello,
I am trying to transmit and recieve 27bytes of data ( Maximum)
Now I am sending the program.
Can u please show me where i gone wrong.
Please help me.
Dirk Lill <> wrote:
Hello,

if the receiver does not recognize valid CAN frames, analyzing tools, like
vector's CANalyzer (http://www.vector-informatik.de/english/), do a good
job.
But if the HCS12 does not send any signal to the bus, please check the
setting of the MODRR register in the Port Integration Module, which is
responsible for the mapping of CAN0 (PTM pins or even PTJ on HCS12DJ64).
Another possible bug might be the LISTEN bit set in CANCTL1 register, which
causes the module not to send any answer but to receive the frames
correctly. These are just a few ideas, for further debugging, you should
provide the initialization code and information about the derivative
(MC9S12D64?).

Best regards,
Dirk -----Original Message-----
From: Manjunath [mailto:]
Sent: Tuesday, May 13, 2003 12:07 PM
To:
Subject: [68HC12] CAN Transmission not working Hello,
Can Anybody tell how to test the CAN Protocol Transmission.
I am using HCS12 of D family and the CAN transciever is of Philips.
I am not getting any pulses on the TXCAN0 of HCS12.
Can anybody tell me Please

Thanks,
With Regards,

Manjunatha T.R.

E-mail : ---------------------------------

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With Regards,

Manjunatha T.R.

E-mail : ---------------------------------




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