#!/bin/sh

# This script is intended to be used on MTAC-003V3 platform, it performs
# the following actions:
#       - export/unpexort pioC23 and pioB13 used to reset the SX1302 chip and setup AP2_NRESET
#       - export/unexport pioC24 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=87     # SX1302 reset
AP2_NRESET_PIN=45       # AP2_NRESET
SX1261_RESET_PIN=88     # SX1261 reset (LBT / Spectral Scan)
SX1302_RESET_pio=C23    # pio for SX1303 reset
AP2_NRESET_pio=B13      # pio for AP1_NRESET
SX1261_NRESET_pio=C24   # pio for SX1261 NRESET

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 "$AP2_NRESET_PIN" > /sys/class/gpio/export; WAIT_GPIO

    # set GPIOs as output
    echo "out" > /sys/class/gpio/pio$SX1302_RESET_pio/direction; WAIT_GPIO
    echo "out" > /sys/class/gpio/pio$SX1261_NRESET_pio/direction; WAIT_GPIO
    echo "out" > /sys/class/gpio/pio$AP2_NRESET_pio/direction; WAIT_GPIO
}

reset() {
    # write output for AP2_NRESET and SX1303 reset
    echo "1" > /sys/class/gpio/pio$AP2_NRESET_pio/value; WAIT_GPIO

    echo "1" > /sys/class/gpio/pio$SX1302_RESET_pio/value; WAIT_GPIO
    echo "0" > /sys/class/gpio/pio$SX1302_RESET_pio/value; WAIT_GPIO

    echo "0" > /sys/class/gpio/pio$SX1261_NRESET_pio/value; WAIT_GPIO
    echo "1" > /sys/class/gpio/pio$SX1261_NRESET_pio/value; WAIT_GPIO
}

term() {
    # cleanup all GPIOs
    if [ -d /sys/class/gpio/pio$SX1302_RESET_pio ]
    then
        echo "$SX1302_RESET_PIN" > /sys/class/gpio/unexport; WAIT_GPIO
    fi
    if [ -d /sys/class/gpio/pio$SX1261_NRESET_pio ]
    then
        echo "$SX1261_RESET_PIN" > /sys/class/gpio/unexport; WAIT_GPIO
    fi
    if [ -d /sys/class/gpio/pio$AP2_NRESET_pio ]
    then
        echo "$AP2_NRESET_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