Android AOSP - android源代码中定义扫描间隔和扫描窗口 [英] Android AOSP - Definition of scan interval and scan window in android source code

问题描述

我已经下载了 Lollipop 5.0 的 AOSP 源代码.在 api 级别 21 中，在蓝牙低功耗扫描设置下，扫描 ble 设备有三个选项 - SCAN_MODE_BALANCED、SCAN_MODE_LOW_LATENCY、SCAN_MODE_LOW_POWER.是否基于不同的扫描间隔和扫描窗口值?如果是这样，我在哪里可以找到源代码目录中为这些宏定义的值.

I have downloaded the AOSP Source code for Lollipop 5.0. In api level 21, under bluetooth low energy scan settings there are three options for scanning the ble devices- SCAN_MODE_BALANCED, SCAN_MODE_LOW_LATENCY, SCAN_MODE_LOW_POWER. Are the based on different scan interval and scan window values? If so, where can I find the values defined for these macros in the source code directory.

推荐答案

我在 http://androidxref.com/5.0.0_r2/xref/packages/apps/Bluetooth/src/com/android/bluetooth/gatt/ScanManager.java 同时搜索关键字SCAN_MODE_BALANCED":

I found below values in http://androidxref.com/5.0.0_r2/xref/packages/apps/Bluetooth/src/com/android/bluetooth/gatt/ScanManager.java while greping the keyword "SCAN_MODE_BALANCED" :

    /**
     * Scan params corresponding to regular scan setting
     */
    private static final int SCAN_MODE_LOW_POWER_WINDOW_MS = 500;
    private static final int SCAN_MODE_LOW_POWER_INTERVAL_MS = 5000;
    private static final int SCAN_MODE_BALANCED_WINDOW_MS = 2000;
    private static final int SCAN_MODE_BALANCED_INTERVAL_MS = 5000;
    private static final int SCAN_MODE_LOW_LATENCY_WINDOW_MS = 5000;
    private static final int SCAN_MODE_LOW_LATENCY_INTERVAL_MS = 5000;

    /**
     * Scan params corresponding to batch scan setting
     */
    private static final int SCAN_MODE_BATCH_LOW_POWER_WINDOW_MS = 1500;
    private static final int SCAN_MODE_BATCH_LOW_POWER_INTERVAL_MS = 150000;
    private static final int SCAN_MODE_BATCH_BALANCED_WINDOW_MS = 1500;
    private static final int SCAN_MODE_BATCH_BALANCED_INTERVAL_MS = 15000;
    private static final int SCAN_MODE_BATCH_LOW_LATENCY_WINDOW_MS = 1500;
    private static final int SCAN_MODE_BATCH_LOW_LATENCY_INTERVAL_MS = 5000;

还要检查 ScanManager.ScanNative.configureRegularScanParams().根据扫描设置(ScanSettings.SCAN_MODE_LOW_POWER、ScanSettings.SCAN_MODE_BALANCED、ScanSettings.SCAN_MODE_LOW_LATENCY)，转换成BLE单位，然后传递给gattSetScanParametersNative().

Also checkout out ScanManager.ScanNative.configureRegularScanParams(). Two params scanWindow and scanInterval are set according to the scan setting (ScanSettings.SCAN_MODE_LOW_POWER, ScanSettings.SCAN_MODE_BALANCED, ScanSettings.SCAN_MODE_LOW_LATENCY), converted into BLE units, and then passed to gattSetScanParametersNative().

希望这会有所帮助.

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