/**
 * @file include/di_fw/charger.h
 * @brief charger header file
 * @date September 12, 2016
 * @author R.H. van Lieshout (PragmaLab)
 * @copyright 2016 Dual Inventive Technology Centre B.V.
 */
#ifndef INCLUDE_DI_FW_CHARGER_H_
#define INCLUDE_DI_FW_CHARGER_H_

#include <di/device/battery.h>

/**
 * Enum of chargers that can be selected
 * Note: for now the charger ID is only used for publishing charger data
 * to the server
 */
enum di_fw_charger {
	DI_FW_CHARGER_1 = 0,
	DI_FW_CHARGER_2,
};

/**
 * Charger states
 * We need to assign numbers to this enum since the
 * state is communicated to the backend
 */
enum di_fw_charger_state {
	DI_FW_CHARGER_STATE_DISCONNECTED = 0,	/**< no charger input voltage */
	DI_FW_CHARGER_STATE_CONNECTED = 1,	/**< charger input voltage OK, not charging */
	DI_FW_CHARGER_STATE_CHARGING = 2,	/**< charger input voltage OK, charging */
	DI_FW_CHARGER_STATE_ERROR = 3		/**< charger input voltage NOT OK, error */
};

struct di_fw_charger_data {
	uint32_t periodic_id;
	float current_voltage;
	float previous_voltage;
	enum di_fw_charger charger_num;
	enum di_fw_charger_state current_state;
	enum di_fw_charger_state previous_state;
};

#define DI_FW_CHARGER_ZERO_LEVEL        1       /* below this voltage, we assume no charger supply is present */

#define DI_FW_CHARGER_MIN_LEVEL         5.5f    /* below this voltage, do not charge */
#define DI_FW_CHARGER_MAX_LEVEL         30.0f   /* above this voltage, do not charge */

#define DI_FW_BATTERY_MIN_CHARGE_LEVEL  13.0f   /* below this voltage, start charging */
#define DI_FW_BATTERY_MAX_CHARGE_LEVEL  14.2f   /* above this voltage, stop charging */

#define DI_FW_CHARGER_DELTA             0.1f    /* threshold for sending data */

/**
 * Set charger module to work
 * @param battery_voltage	the battery voltage of the battery that needs to be charged
 */
void di_fw_charger_kick_charger(float battery_voltage);

/**
 * charger state machine
 * @param battery_val	the battery voltage of the battery that needs to be charged
 * @param charger_val	the charger voltage
 */
void di_fw_charger_fsm(float battery_val, float charger_val);

/**
 * init this module
 */
void di_fw_charger_init(void);

#endif /* INCLUDE_DI_FW_CHARGER_H_ */