Solved: Corecell reset GPIO errors with Raspbian "bookworm" and rak_common_for_gateway

LPWAN Developer Gateways / Concentrators
1

Hi all,

this is for users with Raspberry Pi and “bookworm” Raspian:

I had the known GPIO errors when restarting the packet forwarder using “sudo gateway-config”, for example. When it’s restarting, the reset-gpio-pins are not working since the sysfs-gpio commands are not supported anymore with raspbian bookworm.

Instead of sysfs-gpio, you now have to use gpiod as a method to access and set/reset the GPIOs.

To solve the issue (which otherwise always needs a powercycle to bring up the gateway again), we have to change the sys-fs commands to gpiod. Since there is nothing to “init”, I commented-out the init task at the bottom as well.

In the following code I just commented-out the original commands in case you want to roll-back.

/opt/ttn-gateway/packet_forwarder/lora_pkt_fwd/reset_lgw.sh:

#!/bin/sh

# This script is intended to be used on SX1302 CoreCell platform, it performs
# the following actions:
#       - export/unpexort GPIO23 and GPIO18 used to reset the SX1302 chip and to enable the LDOs
#
# Usage examples:
#       ./reset_lgw.sh stop
#       ./reset_lgw.sh start

# GPIO mapping has to be adapted with HW
#

SX1302_RESET_PIN=17

WAIT_GPIO() {
    sleep 0.1
}

init() {
    # setup GPIOs
#    echo "$SX1302_RESET_PIN" > /sys/class/gpio/export; WAIT_GPIO
#    echo "Init reset_lgw.sh done"
    # set GPIOs as output
#    echo "out" > /sys/class/gpio/gpio$SX1302_RESET_PIN/direction; WAIT_GPIO
}

reset() {
    echo "CoreCell reset through GPIO$SX1302_RESET_PIN..."

   # echo "1" > /sys/class/gpio/gpio$SX1302_RESET_PIN/value; WAIT_GPIO
     gpioset gpiochip0 $SX1302_RESET_PIN=1
     sleep 0.1
   # echo "0" > /sys/class/gpio/gpio$SX1302_RESET_PIN/value; WAIT_GPIO
     gpioset gpiochip0 $SX1302_RESET_PIN=0
     sleep 0.1
}

term() {
    # cleanup all GPIOs
  #  if [ -d /sys/class/gpio/gpio$SX1302_RESET_PIN ]
  #  then
  #      echo "$SX1302_RESET_PIN" > /sys/class/gpio/unexport; WAIT_GPIO
  #  fi
     gpioget gpiochip0 $SX1302_RESET_PIN
}

case "$1" in
    start)
    term # just in case
 #   init
    reset
    ;;
    stop)
    reset
    term
    ;;
    *)
    echo "Usage: $0 {start|stop}"
    exit 1
    ;;
esac

exit 0

In the file start.sh in the same directory as reset_lgw.sh, you need to do the same.

/opt/ttn-gateway/packet_forwarder/lora_pkt_fwd/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

gpioset gpiochip0 $SX1301_RESET_BCM_PIN=0

sleep 0.1

#echo "1" > /sys/class/gpio/gpio$SX1301_RESET_BCM_PIN/value

gpioset gpiochip0 $SX1301_RESET_BCM_PIN=1

sleep 0.1

#echo "0" > /sys/class/gpio/gpio$SX1301_RESET_BCM_PIN/value

gpioset gpiochip0 $SX1301_RESET_BCM_PIN=0

sleep 0.1

#echo "$SX1301_RESET_BCM_PIN" > /sys/class/gpio/unexport

gpioget gpiochip0 $SX1301_RESET_BCM_PIN

./set_eui.sh

sleep 0.2

#./update_gwid.sh ./local_conf.json

sleep 0.5

./lora_pkt_fwd

Without this modification, a restart of the packet forwarder did not work for me and instead it required a powercycle of the whole gateway, to bring back the lgw to its initial state.

Of course, a cleaner look can be achieved by deleting all old commands and unsued methods like “WAIT_GPIO()” and such. I’ll post a cleaned up version below.

2

Cleaned up versions:

/opt/ttn-gateway/packet_forwarder/lora_pkt_fwd/reset_lgw.sh:

#!/bin/sh

# This script is intended to be used on SX1302 CoreCell platform, it performs
# the following actions:
#       - export/unpexort GPIO17 used to reset the SX1302 chip and to enable the LDOs, adapted to gpiod (since raspbian bookworm).
#
# Usage examples:
#       ./reset_lgw.sh stop
#       ./reset_lgw.sh start

# GPIO mapping has to be adapted with HW
#

SX1302_RESET_PIN=17

reset() {
    echo "CoreCell reset through GPIO$SX1302_RESET_PIN..."
     
     gpioset gpiochip0 $SX1302_RESET_PIN=1
     sleep 0.1
     gpioset gpiochip0 $SX1302_RESET_PIN=0
     sleep 0.1
}

term() {
     # "unexport" (set back to "input" by reading its value)
     gpioget gpiochip0 $SX1302_RESET_PIN
}

case "$1" in
    start)
    term # just in case
    reset
    ;;
    stop)
    reset
    term
    ;;
    *)
    echo "Usage: $0 {start|stop}"
    exit 1
    ;;
esac

exit 0

/opt/ttn-gateway/packet_forwarder/lora_pkt_fwd/start.sh:

#! /bin/bash

# Reset iC880a PIN

SX1301_RESET_BCM_PIN=17

gpioset gpiochip0 $SX1301_RESET_BCM_PIN=0
sleep 0.1
gpioset gpiochip0 $SX1301_RESET_BCM_PIN=1
sleep 0.1
gpioset gpiochip0 $SX1301_RESET_BCM_PIN=0
sleep 0.1
# "unexport" (set back to "input" by reading its value)
gpioget gpiochip0 $SX1301_RESET_BCM_PIN

./set_eui.sh
sleep 0.2
#./update_gwid.sh ./local_conf.json
sleep 0.5
./lora_pkt_fwd
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