incorrect data received from the berrygps

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  • #7546
    bepeho
    Participant

    Hi Mark.

    My berrygps-imu is connected to a RPI3B+

    I've double check its input DC power, the antenna wiring, and the  connection between the 2 pieces of hardware

    When cat /dev/ttyS0
    I have at the beginning correct NMEA sentences. Exemple:

     

    $GPGGA,201505.000,4324.2402,N,00342.0575,E,1,7,1.33,3.4,M,49.8,M,,*5C

    $GPGLL,4324.2402,N,00342.0575,E,201505.000,A,A*5D

    $GPGSA,A,3,05,13,02,28,09,30,07,,,,,,2.22,1.33,1.78*0D

    $GPGSV,2,1,07,30,79,079,45,05,65,289,38,07,46,052,48,13,36,283,37*75

    $GPGSV,2,2,07,28,28,140,45,02,21,232,25,09,14,090,48*46

    $GPRMC,201505.000,A,4324.2402,N,00342.0575,E,0.00,262.38,120918,,,A*64

    $GPVTG,262.38,T,,M,0.00,N,0.01,K,

     

    But after a few seconds, I'm receiving incorrect data. Exemple:

    5F��3B�7Fù!g"#��"d"D)$!%HHHqDH
    YV#�$:B"�7�TYt"��5#D23V33�D# F3TI6#FK��5!2D#�! D2

     

    Could you please advise on the way to correct this ?

    Thank you,

    P

    #7547
    PeterP
    Participant

    How do you have it connected?  is it sitting on top of the GPIO of the Raspberry Pi?

     

    What about the console... have you disabled it on the Serial?

    what is the output of;
    dmesg | grep tty

    Peter --OzzMaker.com --

    #7548
    bepeho
    Participant

    Hi Peter.

    Thank you very much for your reactivity.

     

    The berrygps is  soldered to its header, which is plugged to the rpi3.

     

    The console is disabled as specified here

     

    dmesg | grep tty
    [ 0.000000] Kernel command line: 8250.nr_uarts=1 bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=416 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 dwc_otg.lpm_enable=0 console=tty1 root=PARTUUID=0bd45b7a-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
    [ 0.000284] console [tty1] enabled
    [ 0.664405] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 87, base_baud = 0) is a PL011 rev2
    [ 0.665965] 3f215040.serial: ttyS0 at MMIO 0x0 (irq = 166, base_baud = 73500000) is a 16550

     

    Note (for what is may worth), that I've checked with both the internal and the external antenna with the switch, for the same results.

    I've tried a lot of things, even removing gpsd with the same results

    P

     

    #7551
    bepeho
    Participant

    It looks like I've fixed the issue by resetting to the default set of parameters in the /boot/config.ini file.

    May be a bad power config ?

    Everything's back to normal now.

    Thank you for your help.

    P

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