1

sudo sh -c "echo 'param_pps_pin=PA3' >> /boot/armbianEnv.txt"

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

/dts-v1/;
/plugin/;

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

        fragment@0 {
                target = <&pio>;
                __overlay__ {
                                pps_pins: pps_pins {
                                        pins = "PC11";
                                        function = "pps";
                                };
                };
        };

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

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27

/dts-v1/;
/plugin/;

/ {
        compatible = "xunlong,orangepi-zero", "allwinner,sun8i-h2-plus";

        fragment@0 {
                target-path = "/aliases";

                __overlay__ {
                        rtc0 = "/soc/i2c@1c2b400/ds3231";
                };
        };


        fragment@1 {
                target-path = "/soc/i2c@1c2b400";

                __overlay__ {
                        ds3231: rtc@68 {
                                compatible = "maxim,ds3231";
                                reg = <0x68>;
                                #clock-cells = <1>;
                        };
                };
        };
};

1

sudo armbian-add-overlay ds3231.dts

1

sudo apt install gpsd gpsd-tools pps-tools i2c-tools

1
2
3
4
5
6
7
8
9
10
11
12

# Devices gpsd should connect to at boot time.
# They need to be read/writeable, either by user gpsd or the group dialout.
DEVICES="/dev/ttyS2 /dev/pps0"

# Other options you want to pass to gpsd
GPSD_OPTIONS="-n -s 115200"

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

/bin/stty -F /dev/ttyS2 115200
/bin/setserial /dev/ttyS2 low_latency

1
2
3

sudo systemctl daemon-reload
sudo systemctl enable gpsd
sudo systemctl start gpsd

1

sudo apt install chrony

1
2

refclock SHM 0 precision 1e-1 offset 0.0 delay 0.2 refid NMEA noselect
refclock PPS /dev/pps0 lock NMEA refid PPS maxlockage 32 prefer

1
2
3
4
5
6

# This is a configuration file for /etc/init.d/chrony and
# /lib/systemd/system/chrony.service; it allows you to pass various options to
# the chrony daemon without editing the init script or service file.

# Options to pass to chrony.
DAEMON_OPTS="-F 1 -r -m -s"

1
2
3
4
5
6
7
8
9
10
11

# E̅O̅S̅C̅
i2cset -y 0 0x68 0x0e 0x1c

# OSF
i2cset -y 0 0x68 0x0f 0x08

# 设置时间
sudo hwclock -w -f /dev/rtc

# 读取时间
sudo hwclock -r -f /dev/rtc

1
2
3
4

server 0.cn.pool.ntp.org iburst
server 1.cn.pool.ntp.org iburst
server 2.cn.pool.ntp.org iburst
server 3.cn.pool.ntp.org iburst

1

chronyc sourcestats

1
2
3
4
5

Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  Std Dev
==============================================================================
NMEA                        7   3    95   -134.817    741.206  +4490us  9095us
PPS                        39  26   608     -0.000      0.008     -1ns  2553ns
......

1

allow