From my work in attempting to figure out Failsafe i see that the APM ALWAYS treats the throttle channel as the failsafe channel i.e RCMAP_THROTTLE in the full parameter list. Can i change what channel is used to determine failsafe i.e for me it is RCMAP_Pitch.
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Nope. Think about it. Pitch, roll, and yaw channels all "rest" at a value of zero. Then they go plus or minus for left/right/fore/aft. Throttle has a defined minimum, and that minimum represents low throttle. So it is the only channel where one could say "if the PWM falls below X, assume a loss of control".
But i cannot remap my transmitter and my left stick is channel3 which for me is pitch. If the code for failsafe let me define pitch as the failsafe input wouodnt that work?
Can't you just change how you have the receiver signal wires plugged into the APM input channels? It is impossible to use the failsafe on anything but the throttle. It doesn't matter how you map anything. The throttle channel has to be the one used with failsafe.
Using the throttle channel for the RC failsafe is hard-coded into the APM software. You would have to edit and recompile the software to change the channel.
i have requested this here
So you would want to use -125% left roll to indicate failsafe?
Are you using PPM ? Another thing you can do is under Rc remap in MP switch thottle and pitch .. and re calibrate radio in MP this should throttle input from the radio to the correct channel in MP . Judging from what you say about the pitch value moving when you enter failsafe it shows that you have your signals crossed so do as above..