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[gpsd-users] Correct way to handle 5 Hz on an application
From: |
Lisandro Damián Nicanor Pérez Meyer |
Subject: |
[gpsd-users] Correct way to handle 5 Hz on an application |
Date: |
Mon, 22 Oct 2018 11:16:24 -0300 |
Hi! I have some doubts on how to correctly handle this case, so please bear
with me.
The situation is the following: gpsd receives NMEA from a GPS device from a
UDP stream. The GPS device is configured via a µController to send updates at
5Hz.
On my code I do the following:
result = gps_open(host, port,&mGPSData);
[check result]
result = gps_stream(&mGPSData,WATCH_ENABLE|WATCH_JSON, NULL);
[check result]
And then I set up a timer to poll every 150ms., which does:
if(gps_waiting(&mGPSData, 500))
{
int result;
// Read as much data as possible, we need the last available state.
while((result = gps_read(&mGPSData)) > 0);
if(result == -1)
{
<handle error>
}
}
else [...]
My questions are:
- Is polling the right thing to do here?
- Is there another way to handle this? I tired dbus and shmem but could not
make them work (running Debian unstable). I don't know if it's because the
data comes from an UDP feed or something else is happening. I have checked
that the Debian package builds with dbus andshmem support, but still :-/
- Should I check mGPSData.fix.time to see if the info I received is new or
gps_read() will only return the latest status?
Thanks *a lot* in advance, Lisandro.
--
Lisandro Damián Nicanor Pérez Meyer
http://perezmeyer.com.ar/
http://perezmeyer.blogspot.com/
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- [gpsd-users] Correct way to handle 5 Hz on an application,
Lisandro Damián Nicanor Pérez Meyer <=
- Re: [gpsd-users] Correct way to handle 5 Hz on an application, Gary E. Miller, 2018/10/22
- Re: [gpsd-users] Correct way to handle 5 Hz on an application, Lisandro Damián Nicanor Pérez Meyer, 2018/10/23
- Re: [gpsd-users] Correct way to handle 5 Hz on an application, Gary E. Miller, 2018/10/23
- Re: [gpsd-users] External main loop. Was: Correct way to handle 5 Hz on an application, Lisandro Damián Nicanor Pérez Meyer, 2018/10/24
- Re: [gpsd-users] External main loop. Was: Correct way to handle 5 Hz on an application, Lisandro Damián Nicanor Pérez Meyer, 2018/10/24
- Re: [gpsd-users] External main loop. Was: Correct way to handle 5 Hz on an application, Gary E. Miller, 2018/10/24
- Re: [gpsd-users] External main loop. Was: Correct way to handle 5 Hz on an application, Lisandro Damián Nicanor Pérez Meyer, 2018/10/24
- Re: [gpsd-users] External main loop. Was: Correct way to handle 5 Hz on an application, Gary E. Miller, 2018/10/24
- Re: [gpsd-users] External main loop. Was: Correct way to handle 5 Hz on an application, Lisandro Damián Nicanor Pérez Meyer, 2018/10/24
- Re: [gpsd-users] External main loop. Was: Correct way to handle 5 Hz on an application, Lisandro Damián Nicanor Pérez Meyer, 2018/10/24