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陈迪

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[问答]

CAN过滤器如何在Pictus上工作

我在SPC560P上测试CAN过滤功能,但我不清楚CAN Mask如何工作。

配置如下:
Rx ID = 0,Rx Individual Mask = 0xFFFFFF8; BCC = 1;从我的理解,然后CAN节点可以从0到7接收ID,但不能,只能仍然可以接收ID = 0;停下来
检查BUF00 Rx标志;
但是,当我设置Rx Individual Mask = 0时;可以接收所有CAN ID(在BUF00 Rx标志处停止检查);
那么,CAN ID掩码如何工作?
-----------------
CAN_0.RXIMR [0] .R = 0xFFFFFFF8; / * Rx个人面具* /
CAN_0.BUF [0] .ID.B.STD_ID = 0x0; / * Rx ID = 0 * /
/ *检查ID接收* /
if(1 == CAN_0.IFRL.B.BUF00I){

CAN_0.IFRL.B.BUF00I = 1;
// rx完成了

}

以上来自于谷歌翻译


以下为原文




I am testing CAN filtering Function on SPC560P,But am not clear about how CAN Mask working.

Configure as following:
Rx ID =0, Rx Individual Mask = 0xFFFFFF8; BCC = 1; From my understanding, then the CAN Node can Receive ID from 0  to 7, but cannot , only still can receive ID = 0; stop at
BUF00 Rx Flag checked;
But , when I set Rx Individual Mask = 0; all CAN ID can be received (stop at BUF00 Rx Flag checked);
So, How the CAN ID Mask Working?
-----------------
  CAN_0.RXIMR[0].R = 0xFFFFFFF8; /*Rx Individual Mask*/
   CAN_0.BUF[0].ID.B.STD_ID = 0x0; /*Rx ID = 0*/
/*Check ID Receive*/
  if(1== CAN_0.IFRL.B.BUF00I){

    CAN_0.IFRL.B.BUF00I = 1;
     // rx completed   

   }

回帖(1)

刘鑫

2018-11-16 10:47:06
你好楚,
 
 
Rx ID = 0,Rx Individual Mask = 0xFFFFFF8; BCC = 1
Rx Individual Mask用于接受ID过滤和FIFO
 
面具比特
 
对于正常的Rx MB,掩码位会影响MB上编程的ID过滤器。对于Rx FIFO,
掩码位影响滤波器表(ID,IDE,RTR)中编程的所有位。
0过滤器中的相应位是“不关心”
1将根据收到的位检查过滤器中的相应位。
 
我不认为对于STD_ID = 0,RXIMR对掩模系统很有用
你应该使用不同于0的STD_ID。
 
你使用中断处理程序来检索CAN数据?
 
 
 
 
 
 最好的祝福
 
 二万

以上来自于谷歌翻译


以下为原文





Hello Chu ,


Rx ID =0, Rx Individual Mask = 0xFFFFFF8; BCC = 1
Rx Individual Mask is used for acceptance for ID Filtering and the FIFO

Mask Bits

For normal Rx MBs, the mask bits affect the ID filter programmed on the MB. For the Rx FIFO,
the mask bits affect all bits programmed in the filter table (ID, IDE, RTR).
0 The corresponding bit in the filter is “don’t care.�
1 The corresponding bit in the filter is checked against the one received.

I do not think that for STD_ID=0, RXIMR is useful with mask system
you should use a STD_ID different of 0.

do you use the interrupt handler to retrieve the CAN Data ?




  • /*






  • * @brief    interrupt handler.






  • *






  • * @isr






  • */



  • OSAL_IRQ_HANDLER(vector88) {





  •   


  • OSAL_IRQ_PROLOGUE();





  •   


  • // .. your handler ...





  •   


  • OSAL_IRQ_EPILOGUE();



  • }



   Best regards

               Erwan
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