Robert,
Thank you for the fast reply.
So I assume that I need to edit your lines:
P2_01_pinmux { status = "disabled"; }; /* gpio1_18 - EXTINT */
P2_03_pinmux { status = "disabled"; }; /* gpio0_23 - PULSE */
P2_05_pinmux { status = "disabled"; }; /* gpio0_30 - TXD */
P2_07_pinmux { status = "disabled"; }; /* gpio0_31 - RXD */
P1_04_pinmux { status = "disabled"; }; /* gpio2_25 - RST */
I am unsure how you are getting the naming convention for these pins. Can
you shed some light on it for me?
Thank you
On Thursday, August 23, 2018 at 2:36:22 PM UTC-5, RobertCNelson wrote:
>
> On Thu, Aug 23, 2018 at 2:33 PM <[email protected]
> <javascript:>> wrote:
> >
> > Hello,
> > My goal is to make an ultra-precise clock on the beaglebone black by
> using the 1 pps signal from my adafruit GPS. I have been readying about
> the device overlays / capes but there seems to be a lot of outdated
> information out there that is very confusing.
> >
> > My 1 pps is connected to P9_12
> > GPS Rx: P9_24
> > GPS Tx: P9_26
> >
> > I found the following DTS file:
> https://github.com/ddrown/pps-gmtimer/blob/master/DD-GPS-00A0.dts
> >
> > I then edited this file, and replaced the pins with my pins as listed
> above. After compiling the file, I get the following warning:
> >
> > root@AD1:/lib/firmware# dtc -O dtb -o /lib/firmware/DD-GPS-00A0.dtbo -b
> 0-@ DD-GPS-00A0.dts
> > /lib/firmware/DD-GPS-00A0.dtbo: Warning (unit_address_vs_reg): Node
> /fragment@0 has a unit name, but no reg property
> > /lib/firmware/DD-GPS-00A0.dtbo: Warning (unit_address_vs_reg): Node
> /fragment@1 has a unit name, but no reg property
> > /lib/firmware/DD-GPS-00A0.dtbo: Warning (unit_address_vs_reg): Node
> /fragment@2 has a unit name, but no reg property
> >
> > Then, I edited my /boot/uEnv.txt and pointed:
> uboot_overlay_addr0=/lib/firmware/DD-GPS-00A0.dtbo
> >
> > I next rebooted, and expected to see something in dmesg about the 1pps
> signal, but I didn't. I do see the following:
> >
> > root@AWD1:/lib/firmware# dmesg |grep pps
> > [ 0.725865] pps_core: LinuxPPS API ver. 1 registered
> > [ 0.725871] pps_core: Software ver. 5.3.6 - Copyright 2005-2007
> Rodolfo Giometti <[email protected] <javascript:>>
> >
> > Any thoughts as to why I am not seeing a /dev/pps0 device?
>
> Use this overlay as an example:
>
>
> https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/PB-UART4-GNSS-5-CLICK.dts
>
>
>
> https://download.mikroe.com/documents/add-on-boards/click/gnss-5/gnss-5-click-schematic-v101.pdf
>
>
> Regards,
>
> --
> Robert Nelson
> https://rcn-ee.com/
>
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