Re: Fedora7 USB GPS problem

Mikkel L. Ellertson wrote:

Paul Olson wrote:

Hello-
   Having a problem getting a DeLORME USB GPS LT-20 device working with
my Fedora 7 laptop.  It is supposed to work with the cypress_m8 serial
module.

when I loaded the module and plugged in the device, it created the
device (a ls -l in /dev shows this:  crw-rw---- 1 root uucp 188,  0
2007-11-18 22:24 /dev/ttyUSB0).  it shows up when I do a 'cat
/proc/bus/usb/devices':
T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  5 Spd=12  MxCh= 0
D:  Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=1163 ProdID=0200 Rev= 0.01
S:  Manufacturer=DeLorme Publishing
S:  Product=DeLorme USB Earthmate     C:* #Ifs= 1 Cfg#= 1 Atr=80
MxPwr=100mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=03(HID  ) Sub=00 Prot=00 Driver=cypress
E:  Ad=81(I) Atr=03(Int.) MxPS=  32 Ivl=6ms
E:  Ad=02(O) Atr=03(Int.) MxPS=  32 Ivl=6ms


when I do a 'cat /dev/ttyUSB0' I get basically nothing as output.  Some
Internet searching tells me to comment out line 408 (that haas the code
'cypress_set_dead(port);') in the cypress_m8.c file and recompile the
module.  At this point I am stuck.  I found the file and there is the
appropriate line at position 408, I can comment it out but do not need
to know what to do to recompile this module.

Any assistance would be greatly appreciated!

Paul Olson

Before you go to the trouble of re-compiling the module, you may
want to check things out a bit more. As far as I know, none of the
GPS modules will give you anything when using "cat <device>". This
is because you have to set the serial port up, (correct baud rate,
data bits, etc.) and then send it the commands to start it up.

Do you have the gpsd package installed? It should work just fine
with this unit. I am not sure if the latest gpsd package will handle
hot-plugging this GPS, or if you will have to start gpsd yourself,
and tell it to use this port. I have a package that adds some stuff
to udev that I use to manage gpsd, and auto add/remove hot-plugged
devices. I am not sure if it is the official repo though. (I have a
different USB GPS, but I grabbed the device infor from the old gpsd
hotplug code.)

Mikkel

Thanks for the help so far, Mikkel!

when I launch gpsd using:

gpsd -f /dev/ttyUSB0 -n -N

and then try to launch xgps in another terminal window with:

xgps localhost:2947

Thanks again for the assistance...

Paul