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I am also doing similar project with raspberry pi 4 (bullseye version) and neo 6m module. I have followed all the steps given in https://sparklers-the-makers.github.io/blog/robotics/use-neo-6m-module-with-raspberry-pi/ but I do not see any output when I do sudo cat /dev/serial0. It simply hangs, does not crash pi. Ctrl+C brings the unix prompt back, The blue light on the antenna is blinking as suggested by the article.

I don't know which other settings I am missing. Here is the gist of the tutorial:

  1. I am trying to read the GPS data by using Raspberry Pi 4 + Neo 6M GPS module
  2. I edited /boot/config.txt and added dtparam=spi=on dtoverlay=pi3-disable-bt core_freq=250 enable_uart=1 force_turbo=1 at the bottom of the file
  3. I created a backup of /boot/cmdline.txt and in the new cmdline.txt file, added dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
  4. After rebooting, sudo cat /dev/ttyAMA0 hangs. I checked that /dev/serial0 is linked to ttyAMA0. I also used raspi-config to disable login and lastly, I also performed sudo systemctl stop serial-getty@ttyAMA0.service sudo systemctl disable serial-getty@ttyAMA0.service but sudo cat /dev/ttyAMA0 or /dev/serial0 still hangs. Note that the blue light on the antenna is blinking which means the antenna is receiving data. Is it transmitting the data to pi? I don't know. Is there anyway to find it out other than sudo cat /dev/ttyAMA0?
goldilocks
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Shailesh
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  • This is a rather poor tutorial. It is old (pre Bullseye) and advises you to put things in config.txt which are obsolete. You should configure using raspi-config – Milliways Aug 23 '23 at 04:41

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