Error in RAK831 LoRaWAN Gateway Concentrator documentation?

robertlie · March 23, 2020, 8:52am

According to https://doc.rakwireless.com/datasheet/rakproducts/interfaces-rak831#spi
… pin 13 is used to reset SX1301.
Should this not be pin 19?

To reset the RAK831 LoRa concentrator board this script is used:

github.com

RAKWireless/rak_common_for_gateway/blob/master/lora/start.sh

#! /bin/bash


# Reset iC880a PIN
SX1301_RESET_BCM_PIN=17
echo "$SX1301_RESET_BCM_PIN"  > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio$SX1301_RESET_BCM_PIN/direction
echo "0"   > /sys/class/gpio/gpio$SX1301_RESET_BCM_PIN/value
sleep 0.1
echo "1"   > /sys/class/gpio/gpio$SX1301_RESET_BCM_PIN/value
sleep 0.1
echo "0"   > /sys/class/gpio/gpio$SX1301_RESET_BCM_PIN/value
sleep 0.1
echo "$SX1301_RESET_BCM_PIN" > /sys/class/gpio/unexport
./set_eui.sh
sleep 0.2
#./update_gwid.sh ./local_conf.json
sleep 0.5
./lora_pkt_fwd

…as you can see GPIO17 is used.

If you look at the schema:

…GPIO17 is connected to pin 19 (1301_RESET).

Fomi · March 23, 2020, 9:33am

Hi @robertlie,

The PIN 13 in the RAK831 document is RAK831 module’s PIN13.
But in the source code on Github, PIN 17 means RPi’s PIN 17.
Then, we you use RPi + RAK831, RAK831’s PIN13 will connect with RPi’s PIN 17.

robertlie · March 23, 2020, 11:35am

Does this mean the schema is NOT correct?

Note: Script start.sh refers to GPIO17 which is physical pin 11 on Raspberry Pi 3.

Jeff · March 25, 2020, 2:16am

Dear Robertlie,

The Schematic is correct.I think the description in RAK831 document is not correct.
The Schematic you showed is a transfer board which connects to RPi(by H1) and RAK831(by H2).
So RPi connector’s PIN11(GPIO17) will be connect to RAK831 connector’s PIN19(1301_RESET).

robertlie · March 25, 2020, 7:45am

Jeff, thanks. This clarifies a lot.