Jev
46 lines
1.0 KiB
Bash
Executable File
46 lines
1.0 KiB
Bash
Executable File
#!/usr/bin/env bash
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# green: gpiochip3 line 13 / LED1_GREEN (0 = on, 1 = off, active-low)
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# red: gpiochip3 line 14 / LED2_RED (0 = on, 1 = off, active-low)
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#
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# gpioset v2 holds the line until the process exits, so each LED is driven
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# by a background process. We kill and replace it to change state.
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CHIP=/dev/gpiochip3
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GREEN_PIN=13
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RED_PIN=14
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green_pid=""
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red_pid=""
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set_led() {
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local pin=$1 val=$2 pid_var=$3
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kill "${!pid_var}" 2>/dev/null || true
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gpioset --chip "$CHIP" "${pin}=${val}" &
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printf -v "$pid_var" '%s' "$!"
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}
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cleanup() {
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kill "$green_pid" "$red_pid" 2>/dev/null || true
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}
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trap 'cleanup; exit 0' INT TERM
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trap cleanup EXIT
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# release any lines left held by a previous run of this script
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pkill -f "gpioset.*$CHIP" 2>/dev/null || true
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green_state=0 # start ON
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while true; do
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green_state=$(( 1 - green_state ))
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set_led "$GREEN_PIN" "$green_state" green_pid
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if ping -q -c 1 -W 1 8.8.8.8 >/dev/null 2>&1; then
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set_led "$RED_PIN" 1 red_pid
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else
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set_led "$RED_PIN" 0 red_pid
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fi
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sleep 2
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done
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