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#!/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
# - export/unexport GPIO22 used to reset the optional SX1261 radio used for LBT/Spectral Scan
#
# Usage examples:
# ./reset_lgw.sh stop
# ./reset_lgw.sh start
# GPIO mapping has to be adapted with HW
#
SX1302_RESET_PIN=23 # SX1302 reset
SX1302_POWER_EN_PIN=18 # SX1302 power enable
SX1261_RESET_PIN=22 # SX1261 reset (LBT / Spectral Scan)
AD5338R_RESET_PIN=13 # AD5338R reset (full-duplex CN490 reference design)
WAIT_GPIO() {
sleep 0.1
}
init() {
# setup GPIOs
echo "$SX1302_RESET_PIN" > /sys/class/gpio/export; WAIT_GPIO
echo "$SX1261_RESET_PIN" > /sys/class/gpio/export; WAIT_GPIO
echo "$SX1302_POWER_EN_PIN" > /sys/class/gpio/export; WAIT_GPIO
echo "$AD5338R_RESET_PIN" > /sys/class/gpio/export; WAIT_GPIO
# set GPIOs as output
echo "out" > /sys/class/gpio/gpio$SX1302_RESET_PIN/direction; WAIT_GPIO
echo "out" > /sys/class/gpio/gpio$SX1261_RESET_PIN/direction; WAIT_GPIO
echo "out" > /sys/class/gpio/gpio$SX1302_POWER_EN_PIN/direction; WAIT_GPIO
echo "out" > /sys/class/gpio/gpio$AD5338R_RESET_PIN/direction; WAIT_GPIO
}
reset() {
echo "CoreCell reset through GPIO$SX1302_RESET_PIN..."
echo "SX1261 reset through GPIO$SX1302_RESET_PIN..."
echo "CoreCell power enable through GPIO$SX1302_POWER_EN_PIN..."
echo "CoreCell ADC reset through GPIO$AD5338R_RESET_PIN..."
# write output for SX1302 CoreCell power_enable and reset
echo "1" > /sys/class/gpio/gpio$SX1302_POWER_EN_PIN/value; WAIT_GPIO
echo "1" > /sys/class/gpio/gpio$SX1302_RESET_PIN/value; WAIT_GPIO
echo "0" > /sys/class/gpio/gpio$SX1302_RESET_PIN/value; WAIT_GPIO
echo "0" > /sys/class/gpio/gpio$SX1261_RESET_PIN/value; WAIT_GPIO
echo "1" > /sys/class/gpio/gpio$SX1261_RESET_PIN/value; WAIT_GPIO
echo "0" > /sys/class/gpio/gpio$AD5338R_RESET_PIN/value; WAIT_GPIO
echo "1" > /sys/class/gpio/gpio$AD5338R_RESET_PIN/value; WAIT_GPIO
}
term() {
# cleanup all GPIOs
if [ -d /sys/class/gpio/gpio$SX1302_RESET_PIN ]
then
echo "$SX1302_RESET_PIN" > /sys/class/gpio/unexport; WAIT_GPIO
fi
if [ -d /sys/class/gpio/gpio$SX1261_RESET_PIN ]
then
echo "$SX1261_RESET_PIN" > /sys/class/gpio/unexport; WAIT_GPIO
fi
if [ -d /sys/class/gpio/gpio$SX1302_POWER_EN_PIN ]
then
echo "$SX1302_POWER_EN_PIN" > /sys/class/gpio/unexport; WAIT_GPIO
fi
if [ -d /sys/class/gpio/gpio$AD5338R_RESET_PIN ]
then
echo "$AD5338R_RESET_PIN" > /sys/class/gpio/unexport; WAIT_GPIO
fi
}
case "$1" in
start)
term # just in case
init
reset
;;
stop)
reset
term
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
;;
esac
exit 0
|
