46 lines
827 B
Bash
Executable File
46 lines
827 B
Bash
Executable File
#!/bin/sh
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# [1] If empty pin number
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#========================================================#
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if [ -z "$1" ]; then
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echo 127;
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exit 127;
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fi;
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# [2] Check if valid pin number (integer)
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#========================================================#
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test $1 -ge 0 2> /dev/null;
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if [ $? -gt 1 ]; then
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echo 127;
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exit 127;
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fi;
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# [3] Activate (if not already)
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#========================================================#
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test -d /sys/class/gpio/gpio$1 || echo $1 > /sys/class/gpio/export;
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# [4] Set mode to IN
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#========================================================#
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cat /sys/class/gpio/gpio$1/direction | grep -v "in" && echo "in" > /sys/class/gpio/gpio$1/direction;
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# [5] RETURN VALUE
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#========================================================#
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VALUE="`cat /sys/class/gpio/gpio$1/value`";
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echo $VALUE;
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exit $VALUE;
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