mirror of https://github.com/ArduPilot/ardupilot
76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
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/*
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* AP_EPM.h
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*
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* Created on: DEC 06, 2013
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* Author: Andreas Jochum
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*
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* Set-up Wiki: http://copter.ardupilot.com/wiki/common-electro-permanent-magnet-gripper/
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*/
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/// @file AP_EPM.h
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/// @brief AP_EPM control class
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#ifndef __AP_EPM_h__
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#define __AP_EPM_h__
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#include <AP_Math.h>
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#include <AP_Common.h>
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#include <RC_Channel.h>
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// EPM PWM definitions
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#define EPM_GRAB_PWM_DEFAULT 1900
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#define EPM_RELEASE_PWM_DEFAULT 1100
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#define EPM_NEUTRAL_PWM_DEFAULT 1500
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#define EPM_RETURN_TO_NEUTRAL_MS 500 // EPM PWM returns to neutral position this many milliseconds after grab or release
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#define EPM_REGRAB_DEFAULT 0 // default re-grab interval (in seconds) to ensure cargo is securely held
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/// @class AP_EPM
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/// @brief Class to manage the EPM_CargoGripper
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class AP_EPM {
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public:
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AP_EPM();
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// initialise the EPM
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void init();
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// enabled - true if the EPM is enabled
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bool enabled() { return _enabled; }
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// grab - move the EPM pwm output to the grab position
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void grab();
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// release - move the EPM pwm output to the release position
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void release();
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// update - moves the pwm back to neutral after the timeout has passed
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// should be called at at least 10hz
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void update();
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static const struct AP_Param::GroupInfo var_info[];
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private:
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// neutral - return the EPM pwm output to the neutral position
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void neutral();
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// EPM flags
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struct EPM_Flags {
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uint8_t grab : 1; // true if we think we have grabbed onto cargo, false if we think we've released it
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uint8_t active : 1; // true if we are actively sending grab or release PWM to EPM to activate grabbing or releasing, false if we are sending neutral pwm
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} _flags;
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// parameters
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AP_Int8 _enabled; // EPM enable/disable
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AP_Int16 _grab_pwm; // PWM value sent to EPM to initiate grabbing the cargo
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AP_Int16 _release_pwm; // PWM value sent to EPM to release the cargo
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AP_Int16 _neutral_pwm; // PWM value sent to EPM when not grabbing or releasing
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AP_Int8 _regrab_interval; // Time in seconds that gripper will regrab the cargo to ensure grip has not weakend
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// internal variables
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uint32_t _last_grab_or_release;
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};
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#endif /* _AP_EPM_H_ */
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