av_headset_scan.c

csr 蓝牙芯片 无线蓝牙耳机的嵌入式程序

/****************************************************************************
Copyright (C) Cambridge Silicon Radio Ltd. 2004

FILE NAME
    headset_scan.c

DESCRIPTION
    

NOTES

*/


/****************************************************************************
    Header files
*/
#include "av_headset_private.h"
#include "av_headset_scan.h"

#include <connection.h>
#include <hfp.h>

/* TODO: B-4398 for now hard code all scan params. */
#define SCAN_INTERVAL_NORMAL    (0x800)
#define SCAN_WINDOW_NORMAL      (0x12)
#define SCAN_INTERVAL_PAIRING   (0x400)
#define SCAN_WINDOW_PAIRING     (0x200)


/****************************************************************************
NAME    
    headsetEnableConnectable
    
DESCRIPTION
    Make the device connectable 

RETURNS
    void
*/
void headsetEnableConnectable(avTaskData *app)
{
    hci_scan_enable scan = hci_scan_enable_off;

    /* Set the page scan params */
    if (app->pairing_enabled)
        ConnectionWritePagescanActivity(SCAN_INTERVAL_PAIRING, SCAN_WINDOW_PAIRING);
    else
        ConnectionWritePagescanActivity(SCAN_INTERVAL_NORMAL, SCAN_WINDOW_NORMAL);

    /* Make sure that if we're inquiry scanning we don't disable it */
    if (app->inquiry_scan_enabled)
        scan = hci_scan_enable_inq_and_page;
    else
        scan = hci_scan_enable_page;

    /* Enable scan mode */
    ConnectionWriteScanEnable(scan);

    /* Set the flag to indicate we're page scanning */
    app->page_scan_enabled = 1;
}


/****************************************************************************
NAME    
    headsetDisableConnectable
    
DESCRIPTION
    Take device out of connectable mode.

RETURNS
    void
*/
void headsetDisableConnectable(avTaskData *app)
{
    hci_scan_enable scan;

    /* Make sure that if we're inquiry scanning we don't disable it */
    if (app->inquiry_scan_enabled)
        scan = hci_scan_enable_inq;
    else
        scan = hci_scan_enable_off;

    /* Enable scan mode */
    ConnectionWriteScanEnable(scan);

    /* Set the flag to indicate we're not page scanning */
    app->page_scan_enabled = 0;
}


/****************************************************************************
NAME    
    headsetEnableDiscoverable
    
DESCRIPTION
    Make the device discoverable. 

RETURNS
    void
*/
void headsetEnableDiscoverable(avTaskData *app)
{
    hci_scan_enable scan = hci_scan_enable_off;

    /* Set the inquiry scan params */
    ConnectionWriteInquiryscanActivity(SCAN_INTERVAL_PAIRING, SCAN_WINDOW_PAIRING);

    /* Make sure that if we're page scanning we don't disable it */
    if (app->page_scan_enabled)
        scan = hci_scan_enable_inq_and_page;
    else
        scan = hci_scan_enable_inq;

    /* Enable scan mode */
    ConnectionWriteScanEnable(scan);
    
    /* Set the flag to indicate we're inquiry scanning */
    app->inquiry_scan_enabled = 1;
}


/****************************************************************************
NAME    
    headsetDisableDiscoverable
    
DESCRIPTION
    Make the device non-discoverable. 

RETURNS
    void
*/
void headsetDisableDiscoverable(avTaskData *app)
{
    hci_scan_enable scan;
    
    /* Make sure that if we're page scanning we don't disable it */
    if (app->page_scan_enabled)
        scan = hci_scan_enable_page;
    else
        scan = hci_scan_enable_off;

    /* Enable scan mode */
    ConnectionWriteScanEnable(scan);

    /* Set the flag to indicate we're not inquiry scanning */
    app->inquiry_scan_enabled = 0;
}

/****************************************************************************
NAME    
    headsetTestForConnectablilty
    
DESCRIPTION
    See if we should be connectable or not depending on if we are already connected
    to an AG and an audio source

RETURNS
    void
*/
void headsetTestForConnectablilty(avTaskData *app)
{
    if ((app->a2dp_state == avHeadsetA2dpConnected) || 
        (app->a2dp_state == avHeadsetA2dpStreaming))
    {
        /* Don't make the headset connectable and discoverable */
        DEBUG(("NOT CONNECTABLE\n"));
        headsetDisableConnectable(app);
    }
    else
    {
        /* Make the headset connectable and discoverable */
        DEBUG(("CONNECTABLE\n"));
        headsetEnableConnectable(app);
    }
}