GPS module PPS for a NTP Server

[ang]

Is there any CLI image new or old that already supports PPS? I'm not having progress using the default overlay (pps-gpio) or a custom one.

Edited August 2, 2025 by ang

[Guest]

Please use Zero2, not Zero3, and use my DTS overlay,  you can find it in other posts.

[Guest]

Here:

 

https://forum.armbian.com/topic/28425-spi-problem-with-orange-pi-3-lts/#findComment-222557

[Guest]

This is my config, maybe it will help you a little.

 

use UART5 to attach a GPS module, PPS connect to PC11 

 

/boot/armbianEnv.txt

overlay_prefix=sun50i-h616
overlays=uart5
user_overlays=pps-gpio
param_pps_pin=PC11

 

/etc/default/gpsd

 

# Devices gpsd should collect to at boot time.
# They need to be read/writeable, either by user gpsd or the group dialout.
DEVICES="/dev/ttyS1"

# Other options you want to pass to gpsd
GPSD_OPTIONS="-n -G"

# Automatically hot add/remove USB GPS devices via gpsdctl
USBAUTO="false"

 

/etc/chrony/conf.d/gpstime.conf

# for GPSD
refclock SHM 0 refid GPS precision 1e-1 offset 0.120 delay 0.2

# for GPSD PPS , worka
refclock PPS /dev/pps0 refid PPS

allow all

 

 

pps-gpio.dts:

/*
 * PPS-GPIO for H616
 *
 * for Zero2, use PC9
 * for Zero3, use PC11
 * for Zero2W, use PI5, not success
 *
 * feiyao@me.com
 */

/dts-v1/;
/plugin/;

/ {
	compatible = "allwinner,sun50i-h616";

	fragment@0 {
		target = <&pio>;
		__overlay__ {
        		pps_pins: pps_pins {
                  		pins = "PC11";  /*  Zero3 */
                  		function = "gpio_in";
        		};
		};
	};

	fragment@1 {
		target-path = "/";
		__overlay__ {
			pps@0 {
                		compatible = "pps-gpio";
                		pinctrl-names = "default";
				/* pinctrl-0 = <&pps_pins>; */
                		gpios = <&pio 2 11 0>;  /* PC11 @ Zero3 */
                		status = "okay";
			};
		};
        };
};

 

build and install pps-gpio.dts:

 

sudo armbian-add-overlay pps-gpio.dts