gps demo not working in A9G-dev board

[capantoja]

1. SDK version（SDK 版本）

{

SDK V1505

}

---

2. In what kind of operation problems appear, and how to reproduce the problem ?（什么样的操作步骤问题会出现，是否是稳定复现，如何复现问题？）

{

I compile and load the gps demo an watch the trace window

the latitude and longitude is empty.

}

---

[punee995]

please check demo with Active antenna if available if not then try it in open area.

[lamqhoang]

I wonder if the dev board working with passive antenna. I tried with passive antenna in an open area but I couldn't get the location. I did try to remove the inductor on board but no help.

[hjf]

I also have this problem. I'm using what I believe is an active antenna (it's thick and heavy). I enabled other traces in the code but I don't think I'm even getting the NMEA data in UART1. I'm not in open area but the antena is out in the window with view of the sky.

[Neutree]

@hjf gps was connected to UART2 but UART1

[hjf]

Actually the problem was something else. The demo needs a SIM card connected:

    switch(pEvent->id)
    {
        case API_EVENT_ID_GPS_UART_RECEIVED:
        //     Trace(1,"received GPS data,length:%d, data:%s,flag:%d",pEvent->param1,pEvent->pParam1,flag);
            if(flag)
            {
                Buffer_Puts(&gpsNmeaBuffer,pEvent->pParam1,pEvent->param1);
                GpsUpdate();
            }
            break;
        case API_EVENT_ID_UART_RECEIVED:
            if(pEvent->param1 == UART1)
            {
                uint8_t data[pEvent->param2+1];
                data[pEvent->param2] = 0;
                memcpy(data,pEvent->pParam1,pEvent->param2);
                Trace(1,"uart received data,length:%d,data:%s",pEvent->param2,data);
            }
            break;
        case API_EVENT_ID_NETWORK_REGISTERED_HOME:
        case API_EVENT_ID_NETWORK_REGISTERED_ROAMING:
            Trace(1,"register success");
            flag = 1;
            break;
        default:
            break;
    }

Without a SIM, the variable flag is never set.