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compiling error with ev3dev parameters code [message #1803754]

Fri, 08 March 2019 06:35

Eclipse User

Hi All,

I am facing a problem during compiling the code of a SIFB with a cross compiler. How can I include the parameter features in a right way for ev3dev into SIFB because the cross compiler don't know about outB,motor,enable,QX etc. (https://www.eclipse.org/4diac/en_help.php?helppage=html/parameters/parameters.html#ev3). Should I add some wiring features or what should I add? The SIFB code and compiling error is shown in the attached pictures.

I would be nice if someone can upload an example project for ev3dev with 4diac FBs. Thanks.

Regard
Adeel

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Re: compiling error with ev3dev parameters code [message #1803755 is a reply to message #1803754]

Fri, 08 March 2019 06:42

Eclipse User

Hi Adeel,

based on what I see from your screenshots you have two errors,

The first is, that INs and OUTs are not direct variables, but hidden behind function calls. So instead of

outB.motor.enable(QX);

you have to write

outB().motor.enable(QX());

, assuming outB is also a IN or OUT of your FB.

The other thing is, that you FB definition seems to be wrong. Could it be that your INs and OUTs of your FB are missing from the C++ file? If yes first check our FB definition in 4diac-IDE and then reexport it.

Best regards,
Martin

Re: compiling error with ev3dev parameters code [message #1803764 is a reply to message #1803755]

Fri, 08 March 2019 11:34

Eclipse User

Thanks dear Martin for your quick response. Do you have some idea why the fuction blocks (BUTTON, MOTOR) are not initiating/starting? as you can see in attached screenshot 3. ev3 device is connected and forte is running on it.

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Re: compiling error with ev3dev parameters code [message #1803767 is a reply to message #1803764]

Fri, 08 March 2019 12:50

Eclipse User

hi,

I would recommend to not automatically start the E_CYCLE directly from the E_RESTART. The many E_CYCLE events are shadowing any other error message from init. Better for testing do not connect the START event of E_CYCLE and invkoe the START later from 4diac IDE with the trigger event feature. Regarding the initlisation problem: is the sensor or the actuature connected to your EV3?

Re: compiling error with ev3dev parameters code [message #1804019 is a reply to message #1803767]

Fri, 15 March 2019 17:40

Eclipse User

Thnaks dear Alois for your response,
I have found the reason that why the function block was not initialing.
Now, the FB is working and forte is also running on it. Thanks for your comments.

[Updated on: Sat, 16 March 2019 07:01] by Moderator

Re: compiling error with ev3dev parameters code [message #1804079 is a reply to message #1804019]

Sun, 17 March 2019 14:35

Eclipse User

You are welcome. I'm sorry I've worked with EV3 yet, therefore I have no idea.

Re: compiling error with ev3dev parameters code [message #1804095 is a reply to message #1804079]

Mon, 18 March 2019 06:23

Eclipse User

Can you explain what the problem was in case someone else has the same problem? An example with ev3dev can be found here:

https://www.eclipse.org/4diac/en_help.php?helppage=html/examples/pidMotor.html

Re: compiling error with ev3dev parameters code [message #1804106 is a reply to message #1804095]

Mon, 18 March 2019 10:04

Eclipse User

Hi,
There was actually two problems:
1.It is required to configure, generate and build the ev3 environment into the forte executable. if you are working with cmake then you will find a tick mark of FORTE_MODULE_LMS_EV3.
2.There is needed to correct the implementation code of processinterface.cpp file in /forte/src/modules/lms_ev3. The function name "pushBack" is needed to replace with standard call "push_back" from the c++ "vector" library.
if you do this then hopefully the function blocks will initialize.

Regard
Adeel

Re: compiling error with ev3dev parameters code [message #1804277 is a reply to message #1804106]

Thu, 21 March 2019 13:11

Eclipse User

Hi,

thanks for the feedback. Yes we also noticed your 2nd problem. I'll try to get a fix into the 1.10.2 maintainence release.

BR,
Alois

Re: compiling error with ev3dev parameters code [message #1804766 is a reply to message #1804277]

Sun, 31 March 2019 17:42

Eclipse User

Hi dear Alois,

There is one more thing if you like to modify in the next release.
The output function block "QW" from "io" of general typelibrary of 4diac IDE has an input variable "OUT" of WORD type which accepts only positive values and not the negative. For example in case of ev3 Lego Mindstorm, if you want to use PWM (OUT= -100 to 100) for output signal then QW does not accept negative values by showing zero by default and the motor doesn't move in the reverse direction.
I have covered up this issue by changing the variable type from WORD to SINT in 4diac IDE and in forte corresponding replacing WORD by SINT in the QW.cpp and QW.h at forte/src/stdfblib/io.

Regard
Muhammad Adeel

Re: compiling error with ev3dev parameters code [message #1804841 is a reply to message #1804766]

Tue, 02 April 2019 03:55

Eclipse User

Hi,

thanks for pointing that out. This is important to know. However the W in QW stands for WORD and is based on semantics defined in IEC 61131-3. Maybe we need to introduce more Q and I blocks for better handling such use cases.

Cheers,
Alois

Re: compiling error with ev3dev parameters code [message #1804975 is a reply to message #1804841]

Thu, 04 April 2019 03:23

Eclipse User

Try using a F_INT_TO_WORD before the QW FB. This should do the conversion and later QW should do the backwards conversion.

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