ardupilot/libraries/APM_OBC/APM_OBC.h

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#ifndef APM_OBC_H
#define APM_OBC_H
/*
Outback Challenge Failsafe module
Andrew Tridgell and CanberraUAV, August 2012
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
*/
#include <AP_Common.h>
#include <AP_Param.h>
#include <inttypes.h>
class APM_OBC
{
public:
enum control_mode {
OBC_MANUAL = 0,
OBC_FBW = 1,
OBC_AUTO = 2
};
enum state {
STATE_PREFLIGHT = 0,
STATE_AUTO = 1,
STATE_DATA_LINK_LOSS = 2,
STATE_GPS_LOSS = 3
};
// Constructor
APM_OBC(void)
{
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AP_Param::setup_object_defaults(this, var_info);
_last_heartbeat_pin = -1;
_last_manual_pin = -1;
_state = STATE_PREFLIGHT;
_terminate.set(0);
// get a pointer to COMMAND_INDEX so we can resume a
// auto mission when a failsafe condition is resolved
enum ap_var_type var_type;
_command_index = (AP_Int8 *)AP_Param::find("CMD_INDEX", &var_type);
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_saved_wp = 0;
}
void check(enum control_mode control_mode,
uint32_t last_heartbeat_ms,
uint32_t last_gps_fix_ms);
// should we crash the plane? Only possible with
// FS_TERM_ACTTION set to 43
bool crash_plane(void) {
return _terminate && _terminate_action == 42;
}
// for holding parameters
static const struct AP_Param::GroupInfo var_info[];
private:
enum state _state;
// digital output pins for communicating with the failsafe board
AP_Int8 _heartbeat_pin;
AP_Int8 _manual_pin;
AP_Int8 _terminate_pin;
AP_Int8 _terminate;
AP_Int8 _terminate_action;
// last pins to cope with changing at runtime
int8_t _last_heartbeat_pin;
int8_t _last_manual_pin;
int8_t _last_terminate_pin;
// waypoint numbers to jump to on failsafe conditions
AP_Int8 _wp_comms_hold;
AP_Int8 _wp_gps_loss;
bool _heartbeat_pin_value;
// pointer to command index parameter in g
AP_Int8 *_command_index;
// saved waypoint for resuming mission
uint8_t _saved_wp;
};
// map from ArduPlane control_mode to APM_OBC::control_mode
#define OBC_MODE(control_mode) ((control_mode==AUTO?APM_OBC::OBC_AUTO:control_mode==MANUAL?APM_OBC::OBC_MANUAL:APM_OBC::OBC_FBW))
#endif // APM_OBC_H