mirror of
https://github.com/brain-hackers/buildbrain
synced 2024-12-22 12:10:12 +09:00
113 lines
2.4 KiB
Bash
Executable File
113 lines
2.4 KiB
Bash
Executable File
#!/bin/sh
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set -u
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VERBOSE=0
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PIN=""
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SLEEP=1
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GPIOS=""
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while getopts "hvr:p:s:" OPT; do
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case "$OPT" in
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h)
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echo "Usage: blink.sh [-hv] [-r PIN_RANGE_FROM-PIN_RANGE_TO] [-p PIN] [-s SLEEP_SEC]"
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echo "Example: blink.sh -r 0-10 -p 12"
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echo " (blink from GPIO 0 to 10 and 12)"
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exit 0
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;;
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v)
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VERBOSE=1
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;;
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r)
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RE='^([0-9]+)-([0-9]+)$'
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if echo $OPTARG | grep -qvE $RE; then
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echo "Error: invalid range: $OPTARG"
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exit 1
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fi
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FROM=$(echo $OPTARG | sed -E "s/$RE/\\1/")
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TO=$(echo $OPTARG | sed -E "s/$RE/\\2/")
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GPIOS="$GPIOS$(seq -s " " $FROM $TO) "
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;;
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p)
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if echo $OPTARG | grep -qvE "^[0-9]+$"; then
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echo "Error: invalid pin number: $OPTARG"
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exit 1
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fi
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GPIOS="$GPIOS$OPTARG "
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;;
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s)
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if echo $OPTARG | grep -qvE "^[0-9]+$"; then
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echo "Error: invalid sleep duration: $OPTARG"
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exit 1
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fi
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SLEEP=$OPTARG
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;;
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esac
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done
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if [ $VERBOSE -eq 1 ]; then
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echo "Pins to iterate over: $GPIOS"
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fi
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if [ "$(id -u)" -ne "0" ]; then
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echo "Error: please run as root"
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exit 1
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fi
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AVAILABLE_GPIOS=""
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export_gpio() {
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echo $1 > /sys/class/gpio/export
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}
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set_direction() {
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echo out > /sys/class/gpio/gpio$1/direction
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}
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set_value() {
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echo $2 > /sys/class/gpio/gpio$1/value
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}
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for i in $GPIOS; do
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if [ ! -e "/sys/class/gpio/gpio$i" ]; then
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export_gpio $i 2>/dev/null
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if [ $? -ne 0 ]; then
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echo "Error: failed to export the pin $i"
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continue
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fi
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fi
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set_direction $i 2>/dev/null
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if [ $? -ne 0 ]; then
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# Ignore the failure if the actual direction is out
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if grep -vq "out" /dsys/class/gpio/gpio$i/direction; then
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echo "Error: failed to set the direction of the pin $i to out"
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continue
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fi
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fi
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AVAILABLE_GPIOS="$AVAILABLE_GPIOS$i "
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done
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echo "Available GPIOs: $AVAILABLE_GPIOS"
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while [ 1 ]; do
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for i in $AVAILABLE_GPIOS; do
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set_value $i 1 2>/dev/null
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if [ $? -ne 0 ]; then
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echo "Warning: failed to set the value of the pin $i to high"
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fi
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done
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sleep $SLEEP
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for i in $AVAILABLE_GPIOS; do
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set_value $i 0 2>/dev/null
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if [ $? -ne 0 ]; then
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echo "Warning: failed to set the value of the pin $i to low"
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fi
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done
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sleep $SLEEP
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done
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