Hi all, I am a newbie modifying the ardupilot code. I am trying to control this  fuel mixture controller which is a needle valve controller based on servo movement. I am trying to modify the code to move the servo according to a mathematical model based on barometer readings for altitude that I got for my IC engine. For this purpose I am trying to modify the ardupilot code for implementing my custom function. For doing that I have been trying to understand the RC_Channel library. My question is: How do I assign the APM output channel to read the PWM value that I want?

Thank you