Installed BerryGPS/IMU but not receiving any data

[Paul Ingram]

Hello Mike,

I have installed the BerryGPS/IMU according to your instructions and apart from some ssh weirdness after disabling console/enabling serial, I have the fix light flashing on the GPS.

I installed minicom, screen & gpsd to test, but I am not seeing any data using cat, minicom, screen, gpsmon or cgps.

Here is a quick dmesg dump…

and a listing of the devices…

root@raspberrypi:~# ls -lasih /dev/ttyS* /dev/ttyAMA* /dev/serial*
8329 0 lrwxrwxrwx 1 root root 5 Aug 5 07:19 /dev/serial0 -> ttyS0
7536 0 lrwxrwxrwx 1 root root 7 Aug 5 07:19 /dev/serial1 -> ttyAMA0
1157 0 crw-rw—- 1 root dialout 204, 64 Aug 5 07:42 /dev/ttyAMA0
1158 0 crw–w—- 1 root tty 4, 64 Aug 5 09:06 /dev/ttyS0

Any ideas please?

[Mark Williams]

if you use “gpspipe -r” did you see any data?

can you kill gpsd and then do a cat on /dev/serial0

sudo killall gpsd
cat/dev/serial0

Do you see anything with cat now?

Have you tried on another Raspberry Pi?

Mark --OzzMaker.com --

[Paul Ingram]

Hello Mark,

Thanks for your reply. Here are my answers…

root@raspberrypi:/etc# systemctl start gpsd
root@raspberrypi:/etc# gpspipe -r
{"class":"VERSION","release":"3.11","rev":"3.11-3","proto_major":3,"proto_minor":9}
{"class":"DEVICES","devices":[]}
{"class":"WATCH","enable":true,"json":false,"nmea":true,"raw":0,"scaled":false,"timing":false,"split24":false,"pps":false}

Then silence.

root@raspberrypi:/etc# killall gpsd
root@raspberrypi:~# cat /dev/serial0

… no output

I only have one Pi so I can’t test another. The one I have seems to run raspbian pretty well.

Due to operator failure with BBcodes, the dmesg output wasn’t listed in my original post (although it was there) so here it is again…

root@raspberrypi:/etc# dmesg | grep tty
[    0.000000] Kernel command line: 8250.nr_uarts=1 bcm2708_fb.fbwidth=800 bcm2708_fb.fbheight=480 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000  dwc_otg.lpm_enable=0 console=ttyS0,115200 console=tty1 root=/dev/mmcblk0p7 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
[    0.000345] console [tty1] enabled
[    0.756219] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 87, base_baud = 0) is a PL011 rev2
[    0.757704] console [ttyS0] disabled
[    0.757730] 3f215040.serial: ttyS0 at MMIO 0x0 (irq = 220, base_baud = 31250000) is a 16550
[    0.764303] console [ttyS0] enabled
[    1.799058] systemd[1]: Expecting device dev-ttyS0.device...

[Mark Williams]

Hi, that dmesg output looks strange, it shows the that serial is first disabled for the console and then it is enabled.

please show the output of
cat /boot/cmdline.txt
and
cat /boot/config.tct

Mark --OzzMaker.com --

[Paul Ingram]

Hello Mark,

Here we go – and no /boot/config.tct.

root@raspberrypi:~# cat /boot/cmdline.txt
dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=/dev/mmcblk0p7 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
root@raspberrypi:~# cat /boot/config.tct
cat: /boot/config.tct: No such file or directory

[Mark Williams]

I am so sorry… I made a typo, it should have been /boot/config.txt

Anyway, delete console=serial0,115200 from /boot/cmdline.txt and reboot. Try cat /dev/serial0 again.

Mark --OzzMaker.com --

[Paul Ingram]

Hello Mark,

Removed console=serial0,115200 from /boot/cmdline.txt and rebooted, still silence from the

cat /dev/serial0

 

[Paul Ingram]

I might burn a new image & start from scratch with a fresh Raspbian on my Pi 3 and see how I get on – I don’t want to waste your time.

I’ll let you know how I get on…

[Vibhor]

I am facing exact same issue “cat /dev/serial0” gives no output. Did you found what was the issue?

[Damon]

Hey Mark.

I am having the same issues.   I cannot get any output on a Raspberry Pi 3 with BerryGPS.

Here is my output:

pi@raspi2:~ $ dmesg | grep tty
[ 0.000000] Kernel command line: 8250.nr_uarts=1 bcm2708_fb.fbwidth=1824 bcm2708_fb.fbheight=984 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000 dwc_otg.lpm_enable=0 console=tty1 root=PARTUUID=e261b53b-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
[ 0.000345] console [tty1] enabled
[ 0.820557] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 87, base_baud = 0) is a PL011 rev2
[ 0.822204] 3f215040.serial: ttyS0 at MMIO 0x0 (irq = 220, base_baud = 31250000) is a 16550
pi@raspi2:~ $ cat /dev/ttyS0
^C
pi@raspi2:~ $ cat /dev/ttyAMA0
pi@raspi2:~ $ cat /dev/ttyS0
^C
pi@raspi2:~ $ cat /dev/serial0
^C
pi@raspi2:~ $ cat /boot/cmdline.txt
dwc_otg.lpm_enable=0 console=tty1 root=PARTUUID=e261b53b-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
pi@raspi2:~ $

I really don’t have an option to disable the on-board Bluetooth to free up ttyAMA0 as suggested in the raspberry forum on this issue.

I am really hoping you can help me out on this.

Cheers mate!

[Damon]

Problem solved.
With a little extra help from:  Spellfoundry and the fact that I didn’t follow instructions on wiring correctly and had Tx/Rx reversed.  (Old eyes)

It is now running.  Yippie!!!

[Author]

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