BLE_API/public/Gap.h

/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __GAP_H__
#define __GAP_H__

#include "GapAdvertisingData.h"
#include "GapAdvertisingParams.h"
#include "GapEvents.h"

class Gap {
public:
    typedef enum addr_type_e {
        ADDR_TYPE_PUBLIC = 0,
        ADDR_TYPE_RANDOM_STATIC,
        ADDR_TYPE_RANDOM_PRIVATE_RESOLVABLE,
        ADDR_TYPE_RANDOM_PRIVATE_NON_RESOLVABLE
    } addr_type_t;

    static const unsigned ADDR_LEN = 6;
    typedef uint8_t address_t[ADDR_LEN];

    /**
     * Enumeration for disconnection reasons. The values for these reasons are
     * derived from Nordic's implementation; but the reasons are meant to be
     * independent of the transport. If you are returned a reason which is not
     * covered by this enumeration, then please refer to the underlying
     * transport library.
     */
    enum DisconnectionReason_t {
        REMOTE_USER_TERMINATED_CONNECTION = 0x13,
        LOCAL_HOST_TERMINATED_CONNECTION  = 0x16,
        CONN_INTERVAL_UNACCEPTABLE        = 0x3B,
    };

    /* Describes the current state of the device (more than one bit can be set) */
    typedef struct GapState_s {
        unsigned advertising : 1; /**< peripheral is currently advertising */
        unsigned connected   : 1; /**< peripheral is connected to a central */
    } GapState_t;

    typedef uint16_t Handle_t;

    typedef struct {
        uint16_t minConnectionInterval;      /**< Minimum Connection Interval in 1.25 ms units, see @ref BLE_GAP_CP_LIMITS.*/
        uint16_t maxConnectionInterval;      /**< Maximum Connection Interval in 1.25 ms units, see @ref BLE_GAP_CP_LIMITS.*/
        uint16_t slaveLatency;               /**< Slave Latency in number of connection events, see @ref BLE_GAP_CP_LIMITS.*/
        uint16_t connectionSupervisionTimeout; /**< Connection Supervision Timeout in 10 ms units, see @ref BLE_GAP_CP_LIMITS.*/
    } ConnectionParams_t;

    static const uint16_t UNIT_1_25_MS  = 1250; /**< Number of microseconds in 1.25 milliseconds. */
    static const uint16_t UNIT_0_625_MS = 650;  /**< Number of microseconds in 0.625 milliseconds. */
    static uint16_t MSEC_TO_GAP_DURATION_UNITS(uint32_t durationInMillis) {
        return (durationInMillis * 1000) / UNIT_1_25_MS;
    }
    static uint16_t MSEC_TO_ADVERTISEMENT_DURATION_UNITS(uint32_t durationInMillis) {
        return (durationInMillis * 1000) / UNIT_0_625_MS;
    }

    typedef void (*EventCallback_t)(void);
    typedef void (*ConnectionEventCallback_t)(Handle_t, addr_type_t peerAddrType, const address_t peerAddr, const ConnectionParams_t *);
    typedef void (*DisconnectionEventCallback_t)(Handle_t, DisconnectionReason_t);

    friend class BLEDevice;
private:
    /* These functions must be defined in the sub-class */
    virtual ble_error_t setAddress(addr_type_t type,   const address_t address)                    = 0;
    virtual ble_error_t getAddress(addr_type_t *typeP, address_t address)                          = 0;
    virtual ble_error_t setAdvertisingData(const GapAdvertisingData &, const GapAdvertisingData &) = 0;
    virtual ble_error_t startAdvertising(const GapAdvertisingParams &)                             = 0;
    virtual ble_error_t stopAdvertising(void)                                                      = 0;
    virtual ble_error_t disconnect(DisconnectionReason_t reason)                                   = 0;
    virtual ble_error_t getPreferredConnectionParams(ConnectionParams_t *params)                   = 0;
    virtual ble_error_t setPreferredConnectionParams(const ConnectionParams_t *params)             = 0;
    virtual ble_error_t updateConnectionParams(Handle_t handle, const ConnectionParams_t *params)  = 0;

    virtual ble_error_t setDeviceName(const uint8_t *deviceName)              = 0;
    virtual ble_error_t getDeviceName(uint8_t *deviceName, unsigned *lengthP) = 0;
    virtual ble_error_t setAppearance(uint16_t appearance)                    = 0;
    virtual ble_error_t getAppearance(uint16_t *appearanceP)                  = 0;

private:
    /* Event callback handlers */
    void setOnTimeout(EventCallback_t callback) {onTimeout = callback;}
    void setOnConnection(ConnectionEventCallback_t callback) {onConnection = callback;}
    void setOnDisconnection(DisconnectionEventCallback_t callback) {onDisconnection = callback;}

    GapState_t getState(void) const {
        return state;
    }

protected:
    Gap() : state(), onTimeout(NULL), onConnection(NULL), onDisconnection(NULL) {
        /* empty */
    }

public:
    void processConnectionEvent(Handle_t handle, addr_type_t type, const address_t addr, const ConnectionParams_t *params) {
        state.connected = 1;
        if (onConnection) {
            onConnection(handle, type, addr, params);
        }
    }

    void processDisconnectionEvent(Handle_t handle, DisconnectionReason_t reason) {
        state.connected = 0;
        if (onDisconnection) {
            onDisconnection(handle, reason);
        }
    }

    void processEvent(GapEvents::gapEvent_e type) {
        switch (type) {
            case GapEvents::GAP_EVENT_TIMEOUT:
                state.advertising = 0;
                if (onTimeout) {
                    onTimeout();
                }
                break;
        }
    }

protected:
    GapState_t                   state;

private:
    EventCallback_t              onTimeout;
    ConnectionEventCallback_t    onConnection;
    DisconnectionEventCallback_t onDisconnection;

private:
    /* disallow copy and assignment */
    Gap(const Gap &);
    Gap& operator=(const Gap &);
};

#endif // ifndef __GAP_H__