[etherlab-users] Using EtherCAT EoE and Build Errors

[Matthieu Bec]

I have an EL6614, besides starting the master (stable-1.5), configuring 
the network interface and bringing it up, nothing else is needed to get 
EOE connectivity.


On 08/14/12 15:15, Thomas Bitsky, Jr. wrote:
> Ok, so I made some progress, I think. I was able to build as a kernel
> module and install the module. So long as the virtual interface (eoe0s7)
> is not up, the program brings the network into Operation and scans at
> 100Hz.
>
> Then, I issue # ifconfig eoe0s7 up
>
> About 20 seconds later, the entire system hangs and I need to reboot.
>
> In the kernel log, I am seeing this: BUG: scheduling while atomic:
> swapper/0/0x10000100
>
> My understanding is that occurred when using semaphores when spinlocks
> should have been used in the master callbacks. I changed over the
> program to spin locks, but the same thing occurred.
>
> I'm not sure what I could try other than falling back to 1.4.0 and
> seeing if I'm just running into a stable-1.5 bug. I'm following the tty
> examples in the directory very closely. Beyond changing the hardware
> declarations to match the network, it's the same program.
>
> Does anyone have an EoE example they could share?
>
> Thanks!
> T
>
>
> On Tue, Aug 14, 2012 at 7:29 AM, Matthieu Bec <mbec at gmto.org
> <mailto:mbec at gmto.org>> wrote:
>
>
>     Hello Thomas,
>
>     it might be a simple network config problem: the IP address of your
>     virtual interface shouldn't be the same as your field device. Try
>     assigning it something different on the same subnet, e.g.
>     192.168.127.1/8 <http://192.168.127.1/8> and check your routing
>     table is correct
>
>     Regards
>
>     On 08/13/12 22:21, Thomas Bitsky, Jr. wrote:
>
>         Hello! I'm new to using EtherLAB. I've got the master installed as a
>         service, and it's communicating to the network fine. However,
>         I'm having
>         trouble getting the EoE feature up and running.
>
>         I have an Ethernet device in the field with the IP Address
>         192.168.127.254 that I need to communicate with through a web
>         browser. I
>         have an EL6601 that the master is able to see fine. When I put the
>         network into Operation, the RUN light goes steady.
>
>         I'm running on Ubuntu 10.04. I have not installed any real-time
>         extensions; I'm just working with EtherLAB right now.
>
>         If I execute:
>         # ethercat eoe
>
>         I get a listing for eoe0s7 as a virtual interface, and that it
>         is down.
>
>
>         So, I created in /etc/network the file ifcg-eoe0s7 with the
>         following
>         contents:
>
>         IPADDRESS=192.168.127.254/8 <http://192.168.127.254/8>
>         <http://192.168.127.254/8>
>         STARTMODE=auto
>
>         I restarted the computer.
>
>         To raise the interface, I enter:
>
>         # ifconfig eoe0s7 up
>
>         The virtual interface goes up, and the LINK light on the EL6601 goes
>         solid green.
>
>         However, I'm unable to ping 192.168.127.254, or get the pages it
>         serves
>         to pop up. So, I did more reading, and I think I need to do some
>         function calls in the program. So, I added to my test program:
>
>
>         void send_callback(void *cb_data)
>         {
>               ec_master_t *m = (ec_master_t *) cb_data;
>               sem_wait(&mutex);
>               ecrt_master_send_ext(m);
>               sem_post(&mutex);
>         }
>
>         /*****************************__******************************__******************/
>
>         void receive_callback(void *cb_data)
>         {
>               ec_master_t *m = (ec_master_t *) cb_data;
>               sem_wait(&mutex);
>               ecrt_master_receive(m);
>               sem_post(&mutex);
>         }
>
>         int
>         main(int argc, char **argv)
>         {
>
>         ...
>
>            // setup callbacks for EoE
>            ecrt_master_callbacks(master, send_callback,
>         receive_callback, master);
>
>         ...
>
>         }
>
>
>
>         However, it won't build:
>
>         durability.o: In function `send_callback':
>         /home/tbj/srcroot/durability/__src/durability.c:279: undefined
>         reference
>         to `ecrt_master_send_ext'
>         durability.o: In function `main':
>         /home/tbj/srcroot/durability/__src/durability.c:321: undefined
>         reference
>         to `ecrt_master_callbacks'
>
>
>         This is my makefile:
>
>         CC = gcc
>         ETHERCAT_TOPDIR = /home/tbj/srcroot/ethercat
>         CFLAGS = -I$(ETHERCAT_TOPDIR)/include -g -O2
>         LDFLAGS = -L$(ETHERCAT_TOPDIR)/lib/.libs -lethercat -lrt
>
>         OBJECTS = durability.o
>
>         durability.exe : $(OBJECTS)
>         $(CC) $(CFLAGS) $(OBJECTS) $(LDFLAGS) -o durability.exe
>
>         %.o : %.c
>         $(CC) $(CFLAGS) -c $<
>
>
>         Can anyone tell me what I'm missing? I feel like I'm one step
>         away from
>         having this working, but I can't find anything else in any
>         documentation
>         that would lead me to the answer.
>
>         Thanks in advance for any help.
>
>         T
>
>
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>
>
>
>     --
>     Matthieu Bec                GMTO Corp.
>     cell: +1 626 354 9367 <tel:%2B1%20626%20354%209367>      P.O. Box 90933
>     phone: +1 626 204 0527 <tel:%2B1%20626%20204%200527>      Pasadena,
>     CA 91109-0933
>
>
>
>
> --
> Thomas C. Bitsky Jr.
> Lead Developer and Application Engineer
> ADC | automateddesign.com <http://automateddesign.com>
> P: 630-783-1150 F: 630-783-1159 M: 630-632-6679
>