[Etherlab-users] ectty_tx_data undefined symbol inuxcnc-ethercat

[Richard Hacker]

Chimeno

The serial terminal is not exported to the kernel device tree 
(/dev/ttyX), as opposed to the ethernet terminal. You have to implement 
a protocol around your stream within your application and deliver it to 
the terminal as it requires. There is a 22 byte Tx and Rx buffer 
augmented by a control and status word to tell the slave when valid data 
is to be transmitted or to indicate that input data is available.

Although serial data is a stream which should blend well with the stream 
orientated nature of EtherCAT, it is the difference in transmission 
rates that forces you implement some kind of synchronization around your 
data stream.

So to sum it up, it is not a remote TTY under /dev, but it allows you to 
attach sensors or actuators connected via a serial cable to an EtherCAT bus.

- Richard

------------------------------------------------------------------------

Am 26/11/2020 um 08.50 schrieb Sebastien BLANCHET:
> Hi,
> 
> Actually Serial-Over-EtherCAT works only in kernel mode with IgH 
> EtherCAT master.
> 
> The file "examples/tty/serial.c" calls several functions defined in
> "include/ectty.h" and implemented in "tty/module.c"
> 
> These functions exist only in kernel mode.
> 
> If you try to call them in user mode, you will get undefined symbols for
>    ectty_create, ecctty_free, ectty_tx_data, ectty_rx_data
> 
> If you really want to use Serial-Over-EtherCAT you have to rewrite your 
> application to run in kernel mode.
> 
> Regards
> ---
> Sebastien BLANCHET
> 
> Le 22/11/2020 à 21:50, Albert Chimeno garcia a écrit :
>>
>> Hi, I am starting to use el6001, I tried the example that has igh 
>> ethercat and adapted for the EL6001 and it works very well, I wonder 
>> if anyone has been using it with linuxcnc-ethercat and ec-debianize, I 
>> have undefined symbols "ectty_tx_data" I guess I need modify config 
>> file for compilation, but can anyone give me a hint? thanks Chimeno
>>
>>