BerryGPS-IMU V2 @zerow @debian 10 / Kernel 4.19.57+: no data from /dev/serial0

[ralf.schweiger]

Hello all,

is there any issue with the latest Kernel 4.19.57+ and raspbian or is something broken?

I’m trying to get any output from /dev/serial0 with no luck.

dmesg has following output:

root@zero1:/home/pi# dmesg |grep “tty\|serial\|uart”
[ 0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=1 bcm2708_fb.fbwidth=720 bcm2708_fb.fbheight=480 bcm2708_fb.fbswap=1 smsc95xx.macaddr=B8:27:EB:2D:61:BD vc_mem.mem_base=0x1ec00000 vc_mem.mem_size=0x20000000 dwc_otg.lpm_enable=0 console=tty1 root=PARTUUID=c42d34aa-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
[ 0.000547] console [tty1] enabled
[ 0.784758] uart-pl011 20201000.serial: cts_event_workaround enabled
[ 0.784886] 20201000.serial: ttyAMA0 at MMIO 0x20201000 (irq = 81, base_baud = 0) is a PL011 rev2
[ 92.958784] uart-pl011 20201000.serial: no DMA platform data

The Fix LED is blinking orange. I`m using your external antenna with switch position “ext”.

If I try to run a “cat /dev/serial0” it hangs forever until I press ^C.

The config.txt parameters are:

core_freq=250
disable_overscan=1
dtoverlay=pi3-disable-bt
dtoverlay=vc4-fkms-v3d
dtparam=audio=on
dtparam=i2c1=on
dtparam=i2c_arm=on
dtparam=spi=on
enable_uart=1
force_turbo=1
gpu_mem=128
max_framebuffers=2
over_voltage=4
start_x=1

Thank you in advance.

Ralf

 

 

 

[PeterP]

Here are some things to try;
See if it works with minicom;
minicom -b 9600 -o -D /dev/serial0

Try and reset GPS module; (may need to kill gpsd with ‘sudo killall gpsd’)
gpsctl -f -t u-blox -x '\x06\x04\xff\xff\x02\x00' /dev/serial0

Check if you console works;
1. on the Pi, connect TX to RX with a jumper cable.
2. start minicom minicom -b 9600 -o -D /dev/serial0
3. type some characters, if you see them on the screen then your console is working.

Peter --OzzMaker.com --

[ralf.schweiger]

I tested the first two already.

Minicom does not show anything and the gpsctl command hangs too.

The last test with the jumper between Rx/Tx is showing me my chars what I typing.

This meens the console is working.

Regards

Ralf

[PeterP]

Can you send a close up photo of the top half ( near header)of the PCB to sales @ ozzmaker.com. include a link to this post

Peter --OzzMaker.com --

[ralf.schweiger]

Hello Peter,

I just sent two pictures to the mentioned email address.

Hopefully you can see see anything interesting here.

Additionally I will attach one here:

Thank you for your help.

Ralf

[Author]

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