Pixhawk 2.4.8 not entering into ESC calibration mode with Copter-4.0.2

ArduCopter Copter 4.0
1

Hello All,

I am building my new drone which based on Pixhawk 2.4.8
Recently I updated its firmware to v 4.0.2.
Then I discovered that a controller cannot enter into the ESC calibration mode.
First of all, I tried a normal way – Throttle up and power up the controller twice.
Then I tried press ESC calibration button in the Mission Plane with following controller restarting.
I also checked the ESC_CALIBRATION parameter. It was setup to 3 after button pressing.
I also tried setup it manually.

In any case the controller did not enter into calibration mode.
There was no a specific sound. The controller starts in normal mode every time.

I also checked ESC control lines by an oscilloscope (I have simple PWM ESC).
As I imagine in the calibration mode the flight controller has to translate throttle value directly to ESC control outputs. But I was observing only PWM corresponding minimum throttle level independently of
the throttle level.

I did not forget to press safety button.

I don’t understand either I am doing something wrong or this is a firmware bug.

2

Good day, before esc calibration, do you have done the remote controller calibration?
Just check the correct wire of your esc to the fc…

3

What means the remote controller calibration?
It is only about the flight controller.
As I imagine it should switch to the ESC calibration mode independently.
Even without any wires.

4

Have you worked through all the pages in the Wiki here
regarding setting up and calibration?

@Dave84 is referring to the Radio calibration process described here.

5

One thing we changed in Copter-4.0.x vs 3.6.x is we default the ESC_CAL parameter to 0 which disables the high-throttle method of starting the ESC calibration. To re-enable high-throttle method set ESC_CAL = 1.

6

Yes, the radio calibration was performed.

7

Ok. Useful note. I will investigate this.