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Devo f12e fpv stops working after deviation

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10 Jan 2017 15:04 - 10 Jan 2017 15:05 #57790 by Cereal_Killer
Cereal_Killer replied the topic: Devo f12e fpv stops working after deviation
If it's taking you a 2W booster to get to 1000m something in seriously wrong...

1000m is barely "full range", I fly my 3-in-1 equipped u7e with Frsky protocol out to >1MILE (max range in a test and I regularly fly beyond 800m just for fun) and my D10 with its stand alone Cc2500 does even better than that!

As a licensed HAM I've never been a fan of using a booster however of you're only able to attain 800m when using a booster it's pretty clear something big is wrong somewhere.

Taranis X9E | DEVO 10 | Devo U7E | Taranis Q7

What I do in real life: rivergoequestrian.com/
Last Edit: 10 Jan 2017 15:05 by Cereal_Killer.

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10 Jan 2017 15:15 #57791 by Bonemyster
Bonemyster replied the topic: Devo f12e fpv stops working after deviation
Reference 5: FPV still working
Reference 6: Still working
Reference 7: FPV stopped working, got grey screen when connecting to the right channel.

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10 Jan 2017 15:18 #57792 by Bonemyster
Bonemyster replied the topic: Devo f12e fpv stops working after deviation
I guess you didnt read the part when i said my test was not open space. There were plenty of obstacles in the way. When my friend did the test in open space he got 2.somethingkm.

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11 Jan 2017 07:13 - 11 Jan 2017 07:14 #57805 by vlad_vy
vlad_vy replied the topic: Devo f12e fpv stops working after deviation
By the way, TFT panel width parameter is wrong even for "tw8816_init_bl1.3a.h" initialization sequence.

...
0xB5, 0x20, (0x320 = 800) 640 = 0x280
0xB6, 0x34,
...
0xBA, 0xE0, (0x1E0 = 480)
0xBB, 0x12,
...
Last Edit: 11 Jan 2017 07:14 by vlad_vy.

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11 Jan 2017 15:06 #57818 by victzh
victzh replied the topic: Devo f12e fpv stops working after deviation
Why is it incorrect? The LCD panel used in F12E is 5" 800x480 one.

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11 Jan 2017 15:42 #57823 by vlad_vy
vlad_vy replied the topic: Devo f12e fpv stops working after deviation
Sorry, I thought it is 640x480.

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11 Jan 2017 20:11 #57835 by victzh
victzh replied the topic: Devo f12e fpv stops working after deviation
If you supply these parameters incorrectly the whole image will be defective, not only video signal. The defective ones are specifically tied to analog signal interlay.
I'll try to figure out which ones exactly by bisection of changed parameters and watching the result.

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12 Jan 2017 02:22 #57839 by Bonemyster
Bonemyster replied the topic: Devo f12e fpv stops working after deviation
If you have any other builds youd like me to test ill be looking at this thread once a day to keep up to date on the f12e

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12 Jan 2017 04:06 - 12 Jan 2017 04:37 #57840 by vlad_vy
vlad_vy replied the topic: Devo f12e fpv stops working after deviation

victzh wrote: If you supply these parameters incorrectly the whole image will be defective, not only video signal. The defective ones are specifically tied to analog signal interlay.
I'll try to figure out which ones exactly by bisection of changed parameters and watching the result.


"tw8816_init_1.5.h" has:
...
0xB5, 0x20, (0x320 = 800)
0xB6, 0x34,
...
0xBA, 0xE2, (0x1E2 = 482)
0xBB, 0x12,

I think it's timing units, not real pixels.
"Note: The unit for Index B2 through B6 is one panel pixel clock, which is either the output of internal PLL or EXTCLK."
"Note: The unit for Index B7 through BB is one FPHS, i.e. whenever there is an active FPHS, the count is incremented by 1."
Last Edit: 12 Jan 2017 04:37 by vlad_vy.

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12 Jan 2017 06:14 #57841 by victzh
victzh replied the topic: Devo f12e fpv stops working after deviation
Interesting. I'm trying to figure all this TFT thing out for some time already, not only for this chip, but how it's done in general. They have many similarities with analog TV signal in all these front and back porches, scanlines etc. May be couple extra lines are OK :-) Or maybe because of this 1.5 has this strange behavior.

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12 Jan 2017 06:39 - 12 Jan 2017 06:40 #57842 by vlad_vy
vlad_vy replied the topic: Devo f12e fpv stops working after deviation
Why internal PLL have different settings at "tw8816_init_1.5.h" and "tw8816_init_bl1.3a.h"?

registers 0xF9, 0xFA, 0xFB

"tw8816_init_1.5.h" (FPLL = 0x9200 = 37376)
"tw8816_init_bl1.3a.h" (FPLL = 0xE400 = 58368)

PLL Oscillation frequency = 108MHz * FPLL / 2 ^ 17 / 2^ POST
Last Edit: 12 Jan 2017 06:40 by vlad_vy.

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12 Jan 2017 07:27 #57843 by victzh
victzh replied the topic: Devo f12e fpv stops working after deviation
I figured what actually does not work - register 0xBE, value 0x42 - auto-calculation of FPHS period.
All other settings affect something, but this one makes window flood with white when TV signal is present.
1.3, 1.3a, 1.6a - all these settings do not use auto-calculation and work despite slightly different parameters.

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16 Jan 2017 08:53 #58023 by Bonemyster
Bonemyster replied the topic: Devo f12e fpv stops working after deviation
When I saw the 1.15.17 nightly I said great they fixed the fpv problem but when i installed it and got the grey white screen when connecting to my fpv transmitter I got so depressed. Whats up is it a hard fix?

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16 Jan 2017 09:51 #58024 by vlad_vy
vlad_vy replied the topic: Devo f12e fpv stops working after deviation
Nothing changed for Devo F12E up to now. I think victzh need more investigations.

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17 Jan 2017 19:39 #58094 by victzh
victzh replied the topic: Devo f12e fpv stops working after deviation
I have some settings working satisfactorily on my F12E. I can promote it to trunk so that others try them also.

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17 Jan 2017 22:22 #58098 by Artus
Artus replied the topic: Devo f12e fpv stops working after deviation
Please do it :) i am always interessed in news for the F12E

DEVO 10 CC2500 & A7105 V5 N DEVO F12E & CC2500 V5 N
Align TREX 100 (3) Walkera Ladybird V1
Hubsan Q4 Walkera Ladybird V2
Walkera QRW100S Walkera QRX 350 Pro (FPV)
Walkera QRX 350 PREMIUM
Hubsan X4 107 D NAZE32 REV 6 Full with GPS & OSD (test)
CC3D Revolution GPS/OSD(test)...

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18 Jan 2017 06:18 #58111 by victzh
victzh replied the topic: Devo f12e fpv stops working after deviation
OK, submitted pull request, after it is accepted nightly build will have it.

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18 Jan 2017 22:48 #58147 by Artus
Artus replied the topic: Devo f12e fpv stops working after deviation
Thank you for your efforts :)

Are you the "only" one who is able to answer questions about the F12E ?

I tried some other things - (they are not important) and they dont work. But i dont want to make any stress.

If you have time to answer - let us know which function we can test :)

DEVO 10 CC2500 & A7105 V5 N DEVO F12E & CC2500 V5 N
Align TREX 100 (3) Walkera Ladybird V1
Hubsan Q4 Walkera Ladybird V2
Walkera QRW100S Walkera QRX 350 Pro (FPV)
Walkera QRX 350 PREMIUM
Hubsan X4 107 D NAZE32 REV 6 Full with GPS & OSD (test)
CC3D Revolution GPS/OSD(test)...

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18 Jan 2017 23:45 #58148 by victzh
victzh replied the topic: Devo f12e fpv stops working after deviation
Of active developers I'm probably the only one who has F12E. I bought cheap damaged one and replaced LCD.

The modification I submitted is video - it should work in the next nightly build (not current).

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19 Jan 2017 09:01 #58174 by vlad_vy
vlad_vy replied the topic: Devo f12e fpv stops working after deviation
My Devo F12E from today is on the way to me.

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