ardupilot/libraries/APO/AP_ArmingMechanism.h

/*
 * AP_ArmingMechanism.h
 *
 */

#ifndef AP_ARMINGMECHANISM_H_
#define AP_ARMINGMECHANISM_H_

#include <inttypes.h>
#include <wiring.h>

namespace apo {

class AP_HardwareAbstractionLayer;

class AP_ArmingMechanism {

public:
    /**
     * Constructor
     *
     * @param ch1: typically throttle channel
     * @param ch2: typically yaw channel
     * @param ch1Min: disarms/arms belows this
     * @param ch2Min: disarms below this
     * @param ch2Max: arms above this
     */
    AP_ArmingMechanism(AP_HardwareAbstractionLayer * hal,
            uint8_t ch1, uint8_t ch2, float ch1Min, float ch2Min,
            float ch2Max) : _armingClock(0), _hal(hal), _ch1(ch1), _ch2(ch2),
            _ch1Min(ch1Min), _ch2Min(ch2Min) {
    }

    /**
     * update
     *
     * arming:
     * 
     * to arm: put stick to bottom right for 100 controller cycles
     * (max yaw, min throttle)
     *
     * didn't use clock here in case of millis() roll over
     * for long runs
     *
     * disarming:
     *
     * to disarm: put stick to bottom left for 100 controller cycles
     * (min yaw, min throttle)
     */
    void update(const float dt);

private:

    AP_HardwareAbstractionLayer * _hal;
    int8_t _armingClock;
    uint8_t _ch1; /// typically throttle channel
    uint8_t _ch2; /// typically yaw channel
    float _ch1Min; /// arms/disarms below this on ch1
    float _ch2Min; /// disarms below this on ch2
    float _ch2Max; /// arms above this on ch2
};

} // namespace apo

#endif /* AP_ARMINGMECHANISM */

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