Re: [gpsd-users] After RELEASE_TIME device closed, gpsd reports error on next open

[Bin Guo]

First check: "ppscheck /dev/pps0".  Does that work?

Then run "gpsd -nND 5 /dev/PS1 |& fgrep PPS" and copy this list
on the results.

Thanks, will test once I got access to the board again. But in our case the PPS output from GPS is not connected to the CPU system at all but to other hardware component, but I imagine fgrep PPS should still work with D 5?

Yes, funny name, but that still does not tell us what device driver.
The device driver is key here.

>From kernel message:

 [   17.939836] ff010000.serial: ttyPS1 at MMIO 0xff010000 (irq = 41, base_baud = 6249999) is a xuartps

ttyPS1 is provided by drivers/tty/serial/xilinx_uartps.c for  Cadence UART driver (found in Xilinx Zynq)

"-n" and SHM are totally unrelated.

OK, will check to see if I can check shm for GPS status without a monitoring program/thread.

> That can happen, so use "-n" to avoid it.  Might be related to
> whatever /dev/PS1 is.  How long did you wait?  resync can take
> minutes.

You did not answer the above questions.

I believe it's only a couple of seconds, but my experience of gps test is limited (not sure if it's really a resync): original I was only using cgps to check, and found for 3.16 build, cgps stopped updating its messages totally; that didn't occur for 3.19 or git.

 

> I did make a patch attached to handle reactive event inside ubx
> driver which seems to fix this mode issue.

What is a "reactive" event?  Can you share your patch?
[...]
I can only guess without your source code.

Patch seems to be removed, here is it pasted (duplicated event_identified for event_reactivate in driver_ubx.c):

cat z020-ublox-reactivate-hook.patch

Index: git/driver_ubx.c

===================================================================

--- git.orig/driver_ubx.c

+++ git/driver_ubx.c

@@ -2136,6 +2136,22 @@ static void ubx_event_hook(struct gps_de

          * Bad.  Don't do that anymore...

          */

     }

+    else if (event == event_reactivate) {

+        gpsd_log(&session->context->errout, LOG_INF, "UBX reactivated\n");

+

+        /* no longer set UBX-CFG-SBAS here, u-blox 9 does not have it */

+

+#ifdef RECONFIGURE_ENABLE

+        /*

+         * Turn off NMEA output, turn on UBX on this port.

+         */

+        if (session->mode == O_OPTIMIZE) {

+            ubx_mode(session, MODE_BINARY);

+        } else {

+            ubx_mode(session, MODE_NMEA);

+        }

+#endif /* RECONFIGURE_ENABLE */

+    }

 }

 

 #ifdef RECONFIGURE_ENABLE

@@ -2455,6 +2471,8 @@ static void ubx_cfg_prt(struct gps_devic

 

 static void ubx_mode(struct gps_device_t *session, int mode)

 {

+    gpsd_log(&session->context->errout, LOG_INF,

+             "ubx_mode(%d)\n", mode);

     ubx_cfg_prt(session,

                 gpsd_get_speed(session),

                 gpsd_get_parity(session),

Thanks!

-- 

Bin