[etherlab-users] how to implement EoE example?

[Gavin Lambert]

No, you don’t need to write any kernel code, that’s already there.

 

The send/receive callbacks are mainly for use with RTAI or Xenomai implementations where the application is implemented in a super-kernel layer.  You don’t need to use them for a userspace application.

 

From: Ruika You [mailto:crazylinuxcnc at gmail.com] 
Sent: Saturday, 6 May 2017 02:53
To: Gavin Lambert <gavin.lambert at compacsort.com>
Cc: etherlab-users at etherlab.org
Subject: Re: [etherlab-users] how to implement EoE example?

 

Thanks for your reply.

 

You mean I no need to write kernel module for EoE, even though EoE is kernel module of ethercat master. 

 

I found some useful information from follow post:

<https://www.mail-archive.com/etherlab-users@etherlab.org/msg01559.html>

 

As Thomas Bitsky, Jr. comment:

void
send_callback(void *cb_data)
{
ec_master_t *m = (ec_master_t *) cb_data;
        down(&master_sem);
ecrt_master_send_ext(m);
        up(&master_sem);
}
 
void
receive_callback(void *cb_data)
{
ec_master_t *m = (ec_master_t *) cb_data;
        down(&master_sem);
ecrt_master_receive(m);
        up(&master_sem);
 }
 
If they are not in the program and activated by ecrt_master_callbacks, then
there is no lock-up. Of course, EoE doesn't work.

 

I will add code into user space application and give a try. But I confused that how can I send data and receive data if there is no call back function?

 

Thanks!

-chengxi  

  

 

On Fri, May 5, 2017 at 7:27 AM, Gavin Lambert <gavinl at compacsort.com <mailto:gavinl at compacsort.com> > wrote:

I don’t use EoE myself, but as I understand it the kernel component of the master (which exists even if your application is only in userspace) creates regular Linux ethernet devices for the EoE ports of the slaves, and takes care of the message relaying itself.  So your application doesn’t need to do anything special and the userspace application (or any other process on the PC) can send packets to those devices just like any other network interface.  You might need to assign it a static IP before regular apps will talk to it, though.

 

From: etherlab-users [mailto:etherlab-users-bounces at etherlab.org <mailto:etherlab-users-bounces at etherlab.org> ] On Behalf Of Ruika You
Sent: Friday, 5 May 2017 02:45
To: etherlab-users at etherlab.org <mailto:etherlab-users at etherlab.org> 
Subject: [etherlab-users] how to implement EoE example?

 

Dear all,

 

Recently I am trying to implement EoE and do read all threads related EoE in this mailing list.But I  still do not understand well.

First of all, If I am not wrong EoE only works in kernel space? Unfortunatelly, currently my application works in user space. So in this case, I had better to run two master one in user space with current application, another one in kernel space with EoE?

 

Secondly, if anyone have experience with EoE, would you mind share one example?

 

Now I can start EoE and ping through eoe between two machines. I am not clear how to send data and receive data, like tty serial example? but El6614 does not have .xml file.

 

Any hints are appreciated.

 

Thanks very much!  

 

 

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