Time synchronize to GPS and PPS with LattePanda Alpha
I want to synchronize the system time to GPS, and PPS signals using gpsd and chrony.
I have LattePanda Alpha 800s model.
I used the GPS module (MTK3339) and it supports USB, but PPS signal is divided from USB.
If I connect the USB to Panda, I can get the GPS signal through /dev/ttyUSB0.
I already check the GPS signal with gpsmon, but I need PPS device using GPIO to synchronize the system time.
My question is
What is the pin for PPS signal for LattePanda Alpha 800s model?
I tried to add a new PPS device using pps-gpio, but when I type “cat /sys/kernel/debug/gpio” it says
gpiochip0: GPIOs 360-511, parent: platform/INT344B:00, INT344B:00:
gpio-401 ( |0000:00:1e.6 ) in lo IRQ.
I don't know the mapping GPIO number 360 ~ 511 and the picture of pin map of LattePanda Alpha.
How can I get the PPS device (ex. /dev/pps0) ?
I upload the pin map of LattePanda Alpha.
Please give me advice.