52 lines
853 B
Bash
Executable File
52 lines
853 B
Bash
Executable File
#!/usr/bin/env bash
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# usage: led.sh <port>
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set -o xtrace
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# config default
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GPIO_PORT="${1:-18}"
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function export_port() {
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port="${1}"
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echo "${port}" > /sys/class/gpio/export
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}
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function unexport_port() {
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port="${1}"
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echo "${port}" > /sys/class/gpio/unexport
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}
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function set_direction() {
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port="${1}"
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value="${2}"
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echo "${value}" > "/sys/class/gpio/gpio${port}/direction"
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}
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function set_value() {
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port="${1}"
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value="${2}"
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echo "${value}" > "/sys/class/gpio/gpio${port}/value"
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}
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function on() {
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port="${1}"
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set_value "${port}" "0"
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}
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function off() {
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port="${1}"
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set_value "${port}" "1"
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}
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# set exit trap
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trap 'unexport_port "${GPIO_PORT}"' EXIT
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# init GPIO port
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export_port "${GPIO_PORT}"
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set_direction "${GPIO_PORT}" "out"
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# loop led on/off
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while true; do
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on "${GPIO_PORT}"
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sleep 1
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off "${GPIO_PORT}"
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sleep 1
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done
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