Dragino Lora/GPS HAT

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Instructions to use Dragino Lora/GPS HAT on OPOS6ULDev (thanks to RaspberryPi™ compatible connector).

[1]

LoRa™

• 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

• Uses HOPERF RFM96W module (clone of Semtech's SX1276 ?) which is controlled through SPI bus.

# modprobe spidev

• Testing that chip is recognised 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

• https://github.com/tftelkamp/single_chan_pkt_fwd

$ make lora-forwarder

# modprobe spidev
# 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

• http://wiki.dragino.com/index.php?title=Use_Lora/GPS_HAT_%2B_RaspberryPi_to_set_up_a_Lora_Node

$ make lmic-pi

# 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)
• NTP#Time_synchronisation_from_GPS

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.