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.