STM32F4Discovery: Receiving CAN message?

[jurij]

Posted on July 30, 2012 at 19:43

The original post was too long to process during our migration. Please click on the attachment to read the original post.

[waleedaslam89]

Posted on July 31, 2012 at 07:09

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[jurij]

Posted on August 01, 2012 at 12:59

Put to Normal mode and then check what CAN_init returns ... in my case, if I put Normal mode and disconnect the CAN transceiver, I get Init_Failed.

[jurij]

Posted on August 01, 2012 at 19:40

I have a question for you ... in manual (and CAN library), it says CAN Filter Number has to be between 0 and 13 ... you use 14. I found out that if I use a number between 0 and 13, I don't receive any message at all, but if I set it to 14, it accept them (all). Why so?

[Tesla DeLorean]

Posted on August 01, 2012 at 20:04

I have a question for you ... in manual (and CAN library), it says CAN Filter Number has to be between 0 and 13 ... you use 14. I found out that if I use a number between 0 and 13, I don't receive any message at all, but if I set it to 14, it accept them (all). Why so?

Cause you're using CAN2, a slaving device, and the default setting of CAN_FMR is that the filter base for the slave is 14. Use CAN_SlaveStartBank() if you want it set to something else.

The CAN on the STM32F40x has 28 filters, the defaults assume 14 for each CAN1 and CAN2

[waleedaslam89]

Posted on August 02, 2012 at 06:48

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[waleedaslam89]

Posted on August 02, 2012 at 06:56

I still don't understanding the configuration of CAN Filtering . I have manage to understand the CAN list mode filtering but having a problem with Mask mode. 

Suppose I want to filter Identifiers from (100 to 150). Can any one tell me the Mask filter settings and Values for both Extended identifier configuration and Standard Identifier configuration. 

Thanks.

[bjoern2]

Posted on August 02, 2012 at 13:04

You can find more if you search this forum for:

CAN Baud rate

Try this:

 // CAN Bitrate

  CAN_InitStructure.CAN_SJW=CAN_SJW_1tq;    // SJW (1 bis 4 möglich)

 

  CAN_InitStructure.CAN_BS1=CAN_BS1_14tq;   // Samplepoint 72%

 

  CAN_InitStructure.CAN_BS2=CAN_BS2_6tq;    // Samplepoint 72%