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COEX GPS (model UBX-M8030 IC) on Raspberry Pi 4 Model B 2018 connection

From: Aranza Shaccid Leon
Subject: COEX GPS (model UBX-M8030 IC) on Raspberry Pi 4 Model B 2018 connection issues
Date: Tue, 13 Jul 2021 12:48:50 -0700

Hello and good afternoon,

I'm having some difficulty trying to connect my GPS to work with the gpsd program. I have a COEX GPS (module based on UBX-M8030 IC) which I did find a similar version named BN-880 (engine M8030-KT) was compatible with gpsd version 3.14.

I currently have gpsd version 3.17 and the GPS is connected both to a flight controller of a drone that has a UART port connection between the two. The flight controller (Pixracer) is connected to the Raspberry Pi (RPi) via a USB cable.

On the SD card of the Raspberry I've only installed gpsd and gpsd clients (along with necessary programs for the drones flight) and I'm operating on Windows using PuTTY as an SSH window. 

I've been following a guide that instructs how to connect these two, but due to my GPS setup I've been having slight difficulties. Most instructions I've searched for have a connection between the GPS to the RPi (GPIO pins) so this may be the cause of difficulty in the setup. 

I'm not obtaining anything when I attempt the command cat /dev/serial0. I've paused here because according to all the instructions I should be getting a readout of NMEA sentences and this confirms that the GPS is giving out data. The GPS isn't the problem, I can obtain data from it in a different software so I'm having issues trying to set it up correctly.

What I have done so far to connect the GPS:
[    0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=1 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1  smsc95xx.macaddr=E4:5F:01:35:1C:FA vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000  console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait
[    0.001815] printk: console [tty1] enabled
[    1.484727] fe201000.serial: ttyAMA0 at MMIO 0xfe201000 (irq = 36, base_baud               = 0) is a PL011 rev2
[   12.988741] cdc_acm 1-1.4:1.0: ttyACM0: USB ACM device

May I ask for advice or suggestions to fix my current RPi and GPS connection situation? 


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