ardupilot/libraries/AP_RCMapper/AP_RCMapper.h

#pragma once

#include <inttypes.h>
#include <AP_Common/AP_Common.h>
#include <AP_Param/AP_Param.h>

class RCMapper
{
public:
    /// Constructor
    ///
    RCMapper();

    /// roll - return input channel number for roll / aileron input
    uint8_t roll() const { return _ch_roll; }

    /// pitch - return input channel number for pitch / elevator input
    uint8_t pitch() const { return _ch_pitch; }

    /// throttle - return input channel number for throttle input
    uint8_t throttle() const { return _ch_throttle; }

    /// yaw - return input channel number for yaw / rudder input
    uint8_t yaw() const { return _ch_yaw; }

    static const struct AP_Param::GroupInfo var_info[];

private:
    // channel mappings
    AP_Int8 _ch_roll;
    AP_Int8 _ch_pitch;
    AP_Int8 _ch_yaw;
    AP_Int8 _ch_throttle;
};