F12E-XMS : Power off during flight and recv. video (use FPV) about deviation HOT 11 CLOSED

Some source code checks.
I suspect that the crash is caused by a watchdog.
I did not confirm the details.

In the TW8816_GetVideoStandard () or TW8816_SetVideoStandard () function
Delay occurrence is presumed to be the cause of watchdog.
(I2C approach ??)

I do not know if this symptom is only my TX.

Do not call VIDEO_GetStandard / VIDEO_SetStandard periodically in the VIDEO_Update () function,
(to be call only when the value of videosrc changes), the symptom does not occur.

There are three things that I would like to check further.
  - Adjustment of I2C timeout (LONG_TIMEOUT 0x10000, FLAG_TIMEOUT 0x1000)
  - reconfirmation of connection between I2C and LCD
  - Identify the location where the delay occurs

from deviation.

the analyze make sense to me. I will take a look.

from deviation.

unfortunately, GetStandard will not immediately return the correct value. We need defer the get/set standard after couple of seconds. will change this.

from deviation.

Can u test the build?
https://www.deviationtx.com/downloads-new/category/1522-csujun-test-video

I don't have seeing such problem in my f12e. Please report back the result.

from deviation.

ok. i will test the firmware.
I will report the result later.

from deviation.

Also PR is here #573 you can also review the code change.

from deviation.

After about 2.5 hours of testing,
The symptom did not occur. (firmware : devof12e-XMS-v5.0.0-b360129)

I will use the test firmware few days

from deviation.

Thank you for taking time and risk to test.

What's the original repro frequency of the issue? How confidence level you have that it is solved based on this 2.5 hours?

from deviation.

Symptoms occurred in about 5 minutes in the short case and in about 30 minutes in the long case.
(Within 7~8 minutes of batterys 3 pack at runtime)

It was operating normally while testing 9 batteries 2 time
(9 * 2 = 18).
Keeps TX on while drone-battery is charging

from deviation.

I commit the change and you can get it from nightly build then.

from deviation.

Thank you. howard0su

from deviation.