Dragino Lora/GPS HAT
From ArmadeusWiki
Instructions to use the Dragino Lora/GPS HAT on OPOS6ULDev (thanks to RaspberryPi™ compatible connector).
Contents
LoRa™
Setup
- RESET is connected to RPi GPIO0 which is gpio24 on OPOS6UL set as output
- nSS is connected to RPi GPIO6, which is gpio97 on OPOS6UL set as output
- DIO0 is connected to RPi GPIO7, which is gpio10 on OPOS6UL set as input
- on recent models (like the one we tested) DIO1 is connected to RPi GPIO4, which is gpio18 on OPOS6UL set as input
- on recent models (like the one we tested) DIO1 is connected to RPi GPIO5, which is gpio19 on OPOS6UL set as input
- This Hat/Shield is using HOPERF RFM96W module (clone of Semtech's SX1276 ?) which is controlled through SPI bus.
# modprobe spidev
Testing that chip is recognized with python spidev
- Bring chip out of reset:
# echo 24 > /sys/class/gpio/export # echo out > /sys/class/gpio/gpio24/direction # echo 0 > /sys/class/gpio/gpio24/value # echo 1 > /sys/class/gpio/gpio24/value
- activate it:
# echo 97 > /sys/class/gpio/export # echo out > /sys/class/gpio/gpio97/direction # echo 0 > /sys/class/gpio/gpio97/value
- read ID (register 0x42):
import spidev
spi = spidev.SpiDev()
spi.open(3,0)
to_send=[0x42,0x00]
spi.xfer(to_send)
[255, 255]
Tested Software
Gateway
- https://github.com/tftelkamp/single_chan_pkt_fwd
- To compile/install it:
Buildroot | Debian |
---|---|
$ make lora-forwarder |
root@opos6ul:~# cd root@opos6ul:~# git clone https://github.com/tftelkamp/single_chan_pkt_fwd.git root@opos6ul:~# cd single_chan_pkt_fwd/ root@opos6ul:~/single_chan_pkt_fwd# make CFLAGS="-c -Wall -I/usr/include/as_devices/" LIBS="-las_devices" |
- If not already loaded, load spidev driver:
root@opos6ul:~# modprobe spidev
- edit a script and put in it:
root@opos6ul:~# vim /root/start_gateway.sh
#!/bin/sh
echo 9 > /sys/class/gpio/export
echo 24 > /sys/class/gpio/export
echo 97 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio97/direction
echo out > /sys/class/gpio/gpio24/direction
echo in > /sys/class/gpio/gpio9/direction
/root/single_chan_pkt_fwd/single_chan_pkt_fwd
- Make it executable:
root@opos6ul:~# chmod a+x /root/start_gateway.sh
- Launch it ! ;-)
root@opos6ul:~# /root/start_gateway.sh
- To get & printout UDP data forwarded by the gateway (if -i runtime option is used):
#!/usr/bin/python
import socket
import json
UDP_IP = "192.168.1.28" # my IP
UDP_PORT = 1700
sock = socket.socket(socket.AF_INET, # Internet
socket.SOCK_DGRAM) # UDP
sock.bind((UDP_IP, UDP_PORT))
while True:
data, addr = sock.recvfrom(1024) # buffer size is 1024 bytes
json_msg = data[12:]
# print "received JSON message:", json_msg
try:
decoded = json.loads(json_msg)
# print json.dumps(decoded, sort_keys=True, indent=4)
if decoded.get('rxpk'):
print "Packet data: ", decoded['rxpk'][0]['data']
except (ValueError, KeyError, TypeError):
print "JSON format error"
Node
Buildroot | Debian |
---|---|
$ make lmic-pi |
root@opos6ul:~# cd root@opos6ul:~# wget https://github.com/ernstdevreede/lmic_pi/archive/master.zip root@opos6ul:~# unzip master.zip root@opos6ul:~# cd lmic_pi-master/lmic root@opos6ul:~# make CFLAGS="-c -Wall -I/usr/include/as_devices/" LIBS="-las_devices" root@opos6ul:~# cd ../examples/thethingsnetwork-send-v1/ root@opos6ul:~# make CFLAGS="-Wall -I/usr/include/as_devices/ -I../../lmic" LDFLAGS="-las_devices" root@opos6ul:~# chmod a+x thethingsnetwork-send-v1 |
# modprobe spidev # echo 9 > /sys/class/gpio/export # echo 18 > /sys/class/gpio/export # echo 19 > /sys/class/gpio/export # echo 24 > /sys/class/gpio/export # echo 97 > /sys/class/gpio/export # echo out > /sys/class/gpio/gpio97/direction # echo out > /sys/class/gpio/gpio24/direction # echo in > /sys/class/gpio/gpio9/direction # echo in > /sys/class/gpio/gpio18/direction # echo in > /sys/class/gpio/gpio19/direction
GPS
- GPS is connected to UART2 (/dev/ttymxc1)
- Use GPS to get time/date with NTP
Links
- http://www.dragino.com/products/module/item/106-lora-gps-hat.html
- http://wiki.dragino.com/index.php?title=Lora/GPS_HAT
LoRa is a registered trademark of Semtech.
RaspberryPi is a registered trademark of RaspberryPi Foundation.