Can not get GPS through AMA0 data

Hi Tom,

I'm unable to read data from the GPS using AMA0. I was hoping that you or someone else might have a few suggestions...

Everything seems fine using the TTY cable and the USB port. I can launch 'gpsd' and read the data using "cat/dev/ttyUSB0 '. "gpsmon" also gets data OK.

When I wire the UART on the GPIO builtin GPS, I get nothing. The command "gpsmon/dev/ttyAMA0" returns a few seconds with a message "failed to Select (2).  The command "cat/dev/ttyAMA0" crashes, as it doesn't do anything. I checked several times and seem to have the correct changes in the files/etc/inittab and/boot/cmdline.txt. I also checked the wiring, and everything seems OK: GPS is powered, establishes a fix, etc. I even tried the continuity of the follow-up on the wires; still, everything seems fine.

I tried running 'gpsd' interactively as suggested on the GPSD troubleshooting page and get the following:

PI@raspberrypi ~ $ sudo gpsd/dev/ttyAMA0 - n - N - D3 f /var/run/gpsd.sock

GPSD:info: launch (Version 3.6)

GPSD:error: cannot create IPv6 socket

GPSD:info: listening on port GPSD

GPSD:info: NTPD ntpd_link_activate: 1

GPSD:info: fix the/dev/ttyAMA0 device at location 0

GPSD:info: open the GPS 2 data source type to "/ dev/ttyAMA0".

GPSD:info: KPPS cannot define line PPS discipline: invalid argument

GPSD:info: PPS cycle: 1226960683, duration: 1226960683 @ 1403544999.685931

GPSD:info: speed 9600, 8N1

GPSD:info: speed 9600, 8O1

GPSD:info: speed 9600, 8N1

GPSD:info: gpsd_activate(): activated GPS (fd 6)

GPSD:info: device/dev/ttyAMA0 active

GPSD:info: running with the staff of the group ID 20

GPSD:info: running with the UID number 65534

GPSD:info: starting in 2014-06-23 T 17: 36:42.000Z (1403545002)

I get the IPv6 socket error when running on the USB port too, so I don't think that it is important here. Because baud rate 9600 is communicated, I guess that the GPS is to talk. I get the same results with 'gpsmon' and 'chat' like when I run 'gpsd' like a demon.

Using 'dmesg', I see the following:

PI@raspberrypi ~ $ dmesg | grep AMA0

dev:F1 [0.529731]: ttyAMA0 to 0 x 20201000 (irq = 83) MMIO is a PL011 rev3

I would appreciate any suggestions on what to try next... No one else in the forum seems to have this problem, and I have exhausted other sources of Pi. Using the Java ME code gives the same results. Thank you...

P.S. FYI, I ran in a "Segmentation Fault" error during the shooting to the top "sudo. / usertest.sh'. Java ME 8.1 resettlement seemed to remedy...

Dave

Hi Tom,

This has proved to be a hardware problem. I tried to connect the GPS module directly on the GPIO pins and things worked well. I traced the problem to the socket on the test set-up; specifically, the RXD pin had no continuity between the socket and the Board of Directors. I pulled the plug and then reset had continuity again. Somehow, the header RXD pin was not making contact in the test set-up, even if it has not been folded and seemed fine. Strange, and certainly not what I expected...

Thanks again for your help,

Dave

Tags: Java

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