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HCL:Dragino LoRa Shield

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The Dragino LoRa Shield is an Arduino compatible Shield with a LoRa transceiver.

Technical data

  • HopeRF RFM95W / RFM98W LoRa module (SPI)
    • Semtech SX1276 / SX1278 LoRa transceiver

Setup

Raspberry Pi 2 via ARPI600

load mmc 0:2 $fdt_addr_r boot/dtb/$fdtfile
fdt addr $fdt_addr_r
setenv gpio /soc/gpio@7e200000
setenv spi0 /soc/spi@7e204000

# Add GPIOs: 4
fdt set ${gpio}/gpioout brcm,pins '<4 6>'
# Drop GPIOs: 4
fdt set ${gpio}/alt0 brcm,pins '<0 1 2 3 5 7 8 9 10 11 14 15 40 45>'

fdt set ${spi0} status okay

fdt mknode ${spi0} spidev@0
fdt set ${spi0}/spidev@0 compatible "spidev"
fdt set ${spi0}/spidev@0 reg '<0>'
fdt set ${spi0}/spidev@0 spi-max-frequency '<500000>'
# RESET == D9 == P7 ==  4
# DIO0  == D2 == P0 == 17
# DIO1  == D6 == P4 == 23
# DIO2  == D7 == P5 == 24
# DIO3
# DIO4
# DIO5  == D8 == P6 == 25

As alternative to spidev, an experimental driver for "semtech,sx1276" is available. You can use an overlay file:

load mmc 0:2 boot/bcm2836-rpi-2-b+arpi600.dtbo
fdt apply $loadaddr
load mmc 0:2 boot/bcm2836-rpi-2-b+arpi600+dragino-lora.dtbo
fdt apply $loadaddr
load mmc 0:1 $kernel_addr_r EFI/BOOT/BOOTARM.EFI
bootefi $kernel_addr_r $fdt_addr_r

See also