MTK/Android GPS 相关

前言

分享下相关笔记跟概念吧，具体流程不好外传，MTK 有相关文档的
书籍参考 《深入理解 Android: WiFi 模块 NFC 和 GPS 卷》

相关概念

MTK GPS Log 解析

相关流程接口

LocationManager

GPSLP

AGPS

GPS JNI 与 HAL 层

Gps 应用编程

public class LocationTest extends Activity 
{
    private LocationManager mLocationManager = null;
    public void onCreate(Bundle savedInstanceState) {

        mLocationManager = (LocationManager)getSystemService(context.LOCATION_SERVICE);

    }

    public void onResume() {
        mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, null, null, mLocListener);
        mLocationManager.addGpsStatusListener(mGpsListener);
    }
    
    public void onPause() {
        mLocationManager.removeUpdates(mLocListener);
        mLocationManager.removeGpsStatusListener(mGpsListener);
    }
    
    public final LocationListener mLocListener = new LocationListener() 
    {
        public void onLocationChanged(Location location) {/*TODO*/}
        public void onProviderDisabled(String provider) {/*TODO*/}
        public void onProviderEnabled(String provider) {/*TODO*/}
        public void onStatusChanged(String provider, int status, Bundle extras)
        {
        
            if (status == LocationProvider.AVAILABLE) {}
            else if (status == LocationProvider.OUT_OF_SERVICE) {}
            else if (status == LocationProvider.TEMPORARILY_UNAVAILABLE) {}
        }
    }
    public final GpsStatus.Listener mGpsListener = new GpsStatus.Listener() 
    {
        public void onGpsStatusChanged(int event) 
        {
            if (event == GpsStatus.GPS_EVENT_STARTED) {}
            else if (event == GpsStatus.GPS_EVENT_STOPPED) {}
            else if (event == GpsStatus.GPS_EVENT_FIRST_FIX) {}
            else if (event == GpsStatus.GPS_EVENT_SATELLITE_STATUS) {}
        }
    }
}

MTK GPS 搜星类型修改

位置：
Gps_controller.c (vendor\mediatek\proprietary\hardware\connectivity\gps\mtk_mnld\mnld_entity\src)
    static MNL_CONFIG_T mnl_config ={
        .GNSSOPMode = 2,     // 0: G+Gl; 1: G+B, 2:G+Gl+B,3:G, 4:B,5:Gl,6:G+Gl+B+Ga
    }
    
结构体位置：
    typedef enum
    {
      MTK_CONFIG_GPS_GLONASS = 0,
      MTK_CONFIG_GPS_BEIDOU,
      MTK_CONFIG_GPS_GLONASS_BEIDOU,
      MTK_CONFIG_GPS_ONLY,
      MTK_CONFIG_BEIDOU_ONLY,
      MTK_CONFIG_GLONASS_ONLY,
      MTK_CONFIG_GPS_GLONASS_BEIDOU_GALILEO
    } MTK_GNSS_CONFIGURATION;
    
    位置：Mtk_gps_type.h (vendor\mediatek\proprietary\hardware\connectivity\gps\mtk_mnld\mnl\inc)