sz

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PPM not recognized, frame to short
« on: May 30, 2016, 10:10:35 am »
Hello,
I'm using ULRS for my RC models. With ULRS 2.x LP doesn't recognize the PPM signal. Probably because of a short frame end of just 3ms. Ardupilot has no problem.
Is there maybe a way to get LP to work with ULRS? Would a feature request or issue be reasonable?
Thanks,
Sebastian

f5soh

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Re: PPM not recognized, frame to short
« Reply #1 on: May 30, 2016, 11:03:18 am »
Hi, welcome.

Please try the firmware attached with your CC3D.

You should use rescue for flash:
- disconnect board
- hit rescue button
- connect board
- Open button and browse where you saved the file attached
- flash

Anyway, register and create a Jira ticket here: https://librepilot.atlassian.net/projects/LP/issues


sz

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Re: PPM not recognized, frame to short
« Reply #2 on: May 30, 2016, 06:30:37 pm »
thank you for your quick replay!

I installed your firmware, but it also can't read the PPM.

I assuming the PPM input on PIN 8.

See also the attached screenshots.


Sebastian


f5soh

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Re: PPM not recognized, frame to short
« Reply #3 on: May 30, 2016, 06:37:26 pm »
The firmware i posted should allow 2.7ms pulses.
Try with another "normal" PPM receiver if works ?

Please check the ReceiverActivity, no need to populate the RCinput.

Go to UAVOBrowser > Data > ReceiverActivity

« Last Edit: May 30, 2016, 06:40:28 pm by f5soh »

sz

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Re: PPM not recognized, frame to short
« Reply #4 on: May 30, 2016, 06:58:03 pm »
Quote
The firmware i posted should allow 2.7ms pulses.
Try with another "normal" PPM receiver if works ?
This is my only PPM setup. I have to downgrade my TX/RX. Will try it later.
The Ardupilot on APM can read the PPM. Right now I have both (CC3D and APM) connected parallel.

Quote
Please check the ReceiverActivity, no need to populate the RCinput.

Go to UAVOBrowser > Data > ReceiverActivity
please see screenhot. It doesn't look well.

f5soh

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Re: PPM not recognized, frame to short
« Reply #5 on: May 30, 2016, 07:04:16 pm »
Is a CC3D or a CC3D Atom ?

sz

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Re: PPM not recognized, frame to short
« Reply #6 on: May 30, 2016, 07:15:15 pm »
CC3D

f5soh

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Re: PPM not recognized, frame to short
« Reply #7 on: May 30, 2016, 07:18:33 pm »
Maybe you can try to setup the PPM input into the FlexiPort, just to be sure that not a Pin8/hardware issue.

Please create a JIRA ticket.

f5soh

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Re: PPM not recognized, frame to short
« Reply #8 on: May 30, 2016, 07:26:18 pm »
How many channels do you send from Tx side ?

sz

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Re: PPM not recognized, frame to short
« Reply #9 on: May 30, 2016, 08:00:04 pm »
The old ULRS firmware works.
16 chanels.
I will try the flexyport as input

f5soh

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Re: PPM not recognized, frame to short
« Reply #10 on: May 30, 2016, 08:05:12 pm »
Should be 12 channels max

old ULRS firmware support less channels ?

Try reducing the number of channels in your Tx

f5soh

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Re: PPM not recognized, frame to short
« Reply #11 on: May 30, 2016, 08:33:12 pm »
Just wanted to test the ULRS beta because i have a Txmodule 100mW but don't work.
No window after COM selection.
Beta software is a 60 days trial version ?  :-[

Scary...

sz

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Re: PPM not recognized, frame to short
« Reply #12 on: May 30, 2016, 08:44:41 pm »
Quote
Just wanted to test the ULRS beta because i have a Txmodule 100mW but don't work.
No window after COM selection.
I have to start the Software on one PC few times. There will be a new window at some time.

Quote
Beta software is a 60 days trial version ?
He says that he want to avoid a buggy version of his software. I assume there will be a stable version without limited time.

Quote
old ULRS firmware support less channels ?
yes, just 8.

Quote
Try reducing the number of channels in your Tx
I just configured 5 channels on openTX

Quote
Please create a JIRA ticket.
I will create a feature request for 16 channels. Like cleanflight.

f5soh

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Re: PPM not recognized, frame to short
« Reply #13 on: May 30, 2016, 09:43:28 pm »
We can do like others, but i wonder why 16 channels are needed ?

Try firmware attached.

sz

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Re: PPM not recognized, frame to short
« Reply #14 on: May 30, 2016, 10:11:08 pm »
It works!
Thank you for your fast help and precise instructions!

Quote
We can do like others, but i wonder why 16 channels are needed ?
For me 8 channels are enough, but the ULRS developer seems to think 16 channels fix are better... I will ask him to optional choose between 12 and 16 channels.

I will still open a feature request via JIRA OK?


Thanks again a lot!