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[5744P]FlexCAN example code problem

Question asked by eric hsu on Nov 10, 2016
Latest reply on Jan 9, 2017 by yefang xiao

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I'm using the MPC5744P now. I use GHS MULTI IDE and P&E MULTILINK and EVB is KIT33908MBEVBE+KITMPC5744DBEVM.

But the CAN0 ( FlexCAN module) can not work well. And the program is always suspending in the below line.

while ( (CAN_0.IFLAG1.B.BUF31TO8I & 1) == 0) { } // wait until the tx is completed.

Could someone give me advice about the CAN0, please? It would be better if you can share me the example code of FlexCAN.

Thanks a lot.

Original Attachment has been moved to: Example-MPC5744P-FlexCAN-simpleTXRX-v1_0-GHS614.zip

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Petr Stancik Nov 11, 2016 2:10 AM
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Hi,

this example was written for and tested on the MPC5744P EVB and it works well on this EVB.
With your demo board this example cannot work as the SBC CAN transceiver is used on the motherboard (KIT33908MBEVBE). The SBC chip must be initialized and CAN transceiver enabled.

You can refer to the demo code for this board; https://www.nxp.com/webapp/Download?colCode=MPC5744P-MC33907-MC33908-DEMO. It does the SCB init as well as simple CAN transmit.

BR, Petr
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- yefang xiao @ Petr Stancik on Jan 9, 2017 12:31 AM
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  Hi Petr,
  I use this example code and tested on the MPC5744P EVB,but it cannot work.Everytime it stops at this words:
  while ( (CAN_0.IFLAG1.B.BUF31TO8I & 1) == 0) { } // wait until the tx is completed.
  I locate TransmitMsg() into PIT0_ISR,then the PIT cannot work;When I mask this words,the PIT works well.So I think there is something wrong with it.Can you help me?Thanks very much.
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eric hsu Nov 11, 2016 3:03 AM
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Hi Petr,

I modify MPC5744P-MPC33908 demo code in test2 project, and I confirm the CAN transceiver is in normal mode.
I set KIT33908MBEVBE in debug mode(set jp112), but CAN date frame does not be send. Could you help me check, please?
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- test2.zip2.0 MB
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- Petr Stancik @ eric hsu on Nov 11, 2016 6:01 AM
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  Hi Eric,
  
  The demo example works properly on my board, but your Eclipse port does not. Seems you also modify the SBC driver, or not? Anyway it does not go through SBC Init on my side.
  
  BR, Petr
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eric hsu Nov 11, 2016 6:26 AM
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Hi Petr

Yes, I modify SBC Init form demo code because the demo code is GHS project.
Could you provide FlexCAN sample code for S32 DS project or get me advice how to modify, please?
Thanks a lot.
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- Jun Li @ eric hsu on Dec 20, 2016 8:39 PM
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  Hi，hsu
  Did you have solved your problem? I also use GHS MULTI IDE and EVB is KIT33908MBEVBE+KITMPC5744DBEVM .Now, the CAN0 ( FlexCAN module) can not work well,too. Is it must that the SBC chip be initialized and CAN transceiver enabled by codes?Because as we know,when JP112 is set,the CAN transceiver is in normal mode.Look forward to your reply！
  
  Thanks a lot.
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yefang xiao Jan 7, 2017 4:12 AM
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Hi,Hsu
Did you have sovled your problem?I meet the same problem as you.I think there is something wrong with the example code.Since I find the program is always suspending in the below line.
while ( (CAN_0.IFLAG1.B.BUF31TO8I & 1) == 0) { } // wait until the tx is completed.
The development board I use is MPC5744P EVB ,without MC33908.
Look forward for your response.
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[5744P]FlexCAN example code problem

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