4. Unable to read data from GNSS Module with Core 2

Unable to read data from GNSS Module with Core 2

  • F

    @fra222 Thanks a lot again. It is working perfectly now with the 38 400 baudrate. The precision is impressing !

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  • @fra222 said in Unable to read data from GNSS Module with Core 2:

    @fra222 Thanks a lot again. It is working perfectly now with the 38 400 baudrate. The precision is impressing !

    good to hear that you have it sorted now @FRA222

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  • U

    Hello,

    I struggle to get GPS data from the GNSS module to the Core2.
    I'm using the demo code here:
    https://github.com/m5stack/M5Module-GNSS/blob/main/examples/getPosition/getPosition.ino
    with the following settings: Serial2.begin(38400, SERIAL_8N1, 13, 14);

    it seems like the Core2 is receiving data from the module, but it doesn't catches any satellite.

    The external antenna is connected and left outside.
    I tried with another Core2 and another GNSS module with same result.

    Any idea ?

    rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
    configsip: 0, SPIWP:0xee
    clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
    mode:DIO, clock div:1
    load:0x3fff0030,len:1344
    load:0x40078000,len:13964
    load:0x40080400,len:3600
    entry 0x400805f0

    Sats HDOP Latitude Longitude Fix Date Time Date Alt Course Speed Card Distance Course Card Chars Sentences Checksum
    (deg) (deg) Age Age (m) --- from GPS ---- ---- to London ---- RX RX Fail

    **** ***** ********** *********** **** ********** ******** **** ****** ****** ***** *** ******** ****** *** 0 0 0
    0 100.0 ********** *********** **** 00/00/2000 00:00:00 951 ****** ****** ***** *** ******** ****** *** 369 0 0
    0 100.0 ********** *********** **** 00/00/2000 00:00:00 952 ****** ****** ***** *** ******** ****** *** 738 0 0
    0 100.0 ********** *********** **** 00/00/2000 00:00:00 953 ****** ****** ***** *** ******** ****** *** 1107 0 0
    ....

    0 100.0 ********** *********** **** 00/00/2000 00:00:00 655 ****** ****** ***** *** ******** ****** *** 25400 0 0
    0 100.0 ********** *********** **** 00/00/2000 00:00:00 656 ****** ****** ***** *** ******** ****** *** 25437 0 0
    0 100.0 ********** *********** **** 00/00/2000 00:00:00 657 ****** ****** ***** *** ******** ****** *** 25474 0 0
    0 100.0 ********** *********** **** 00/00/2000 00:00:00 657 ****** ****** ***** *** ******** ****** *** 25511 0 0

    0_1713188342770_gnss-core2.jpeg

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  • would it matter if your PPS dip switch isn't set as default?

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  • U

    @robski Thank you for your message. I tried to set dip 1 to on but without any success nor changes.
    (I actually wonder what this PPS is)

    There are data coming out from Serial2, but it seems that they cannot be decoded by tinyGPS.

    0x24 0x47 0x4e 0x52 0x4d 0x43 0x2c 0x2c 0x56 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x4e 0x2c 0x56 0x2a 0x33 0x37 0x0d 0x0a 0x24 0x47 0x4e 0x56 0x54 0x47 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x4e 0x2a 0x32 0x45 0x0d 0x0a 0x24 0x47 0x4e 0x47 0x47 0x41 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x30 0x2c 0x30 0x30 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2a 0x35 0x36 0x0d 0x0a 0x24 0x47 0x4e 0x47 0x53 0x41 0x2c 0x41 0x2c 0x31 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x31 0x2a 0x33 0x33 0x0d 0x0a 0x24 0x47 0x4e 0x47 0x53 0x41 0x2c 0x41 0x2c 0x31 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x32 0x2a 0x33 0x30 0x0d 0x0a 0x24 0x47 0x4e 0x47 0x53 0x41 0x2c 0x41 0x2c 0x31 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x33 0x2a 0x33 0x31 0x0d 0x0a 0x24 0x47 0x4e 0x47 0x53 0x41 0x2c 0x41 0x2c 0x31 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x34 0x2a 0x33 0x36 0x0d 0x0a 0x24 0x47 0x50 0x47 0x53 0x56 0x2c 0x31 0x2c 0x31 0x2c 0x30 0x30 0x2c 0x31 0x2a 0x36 0x34 0x0d 0x0a 0x24 0x47 0x4c 0x47 0x53 0x56 0x2c 0x31 0x2c 0x31 0x2c 0x30 0x30 0x2c 0x31 0x2a 0x37 0x38 0x0d 0x0a 0x24 0x47 0x41 0x47 0x53 0x56 0x2c 0x31 0x2c 0x31 0x2c 0x30 0x30 0x2c 0x37 0x2a 0x37 0x33 0x0d 0x0a 0x24 0x47 0x42 0x47 0x53 0x56 0x2c 0x31 0x2c 0x31 0x2c 0x30 0x30 0x2c 0x31 0x2a 0x37 0x36 0x0d 0x0a 0x24 0x47 0x4e 0x47 0x4c 0x4c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x56 0x2c 0x4e 0x2a 0x37 0x41 0x0d 0x0a 0 100.0 ********** *********** **** 00/00/2000 00:00:00 245 ****** ****** ***** *** ******** ****** *** 369 0 0

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  • U

    @unumdesignum The data returned by the GNSS module in ASCII:

    $GNRMC,,V,,,,,,,,,,N,V37
    $GNVTG,,,,,,,,,N    2E
    $GNGGA,,,,,,0,00,99.99,,,,,,56
    $GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,1    33
    $GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,230
    $GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,3    31
    $GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,436
    $GPGSV,1,1,00,1    64
    $GLGSV,1,1,00,178
    $GAGSV,1,1,00,7    73
    $GBGSV,1,1,00,176
    $GNGLL,,,,,,V,N    7A

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  • Have you tried different baudrates?

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  • U

    @robski yes I did. At 38400 I have a communication with the GNSS module. At other baud rates, I've got nothing.
    Issue is not to communicate with the module, it is that the module does not return any valid position.

    After some researches, my understanding is that I need to find out how to configure the GNSS module to make it work in my location (France). It seems that the actual configuration does not work. I'm learning the uBlox PBX commands as we speak.

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  • U

    I connected the module to the u-center app to have more information, but nothing helpful here.
    The GNSS module does not see any satellite (GSV sentences).
    Is there any GPS expert able to check the configuration ?

    0_1713299332068_config.jpeg
    0_1713299346969_log1.jpeg 0_1713299360561_log2.jpeg

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  • U

    For information to future readers, this morning one device Core2+GNSS suddenly started to work without any changes. The other one (same hw/sw) is now able to see satellites (between 11 to 14) but is totally unable to get a fix.

    ~~I wanted to use the magnetic gyroscope (BMM150) as well, but the data seems crazy and I cannot get any heading from them. Moreover, since this morning, the BIM270 initialisation is not more working.

    So I give up this module and I will use another GPS solution.~~

    Edit: thanks to M5Stack Support, the GNSS modules work fine now.
    The magnetic gyroscope BMM150, as other magnetometer requires a proper calibration to be used.

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