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<?php |
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namespace Ballen\GPIO\Adapters; |
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use Ballen\GPIO\Exceptions\GPIOException; |
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use Ballen\GPIO\Interfaces\AdapterInterface; |
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/** |
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* GPIO |
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* A RaspberryPi GPIO library written in PHP. |
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* |
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* @author Bobby Allen <[email protected]> |
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* @license http://www.gnu.org/licenses/gpl-3.0.html |
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* @link https://github.com/allebb/gpio |
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* @link http://www.bobbyallen.me |
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* @package Ballen\GPIO\Adapters |
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* @codeCoverageIgnore |
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*/ |
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class RPiAdapter implements AdapterInterface |
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{ |
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const GPIO_PATH = "/sys/class/gpio"; |
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/** |
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* Set the direction of the pin (input or output) |
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* |
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* @param int $pin The BCM pin number |
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* @param string $direction The type/direction of the pin - Use GPIO::IN and GPIO::OUT |
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* @param bool $invert Invert the logic so that high->low and low->high |
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* @return bool |
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*/ |
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public function setDirection(int $pin, string $direction, bool $invert = false): bool |
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{ |
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$this->export($pin); |
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if (file_exists("/sys/class/gpio/gpio{$pin}/direction") && trim(file_get_contents("/sys/class/gpio/gpio{$pin}/direction")) !== $direction) { |
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system("echo {$direction} > /sys/class/gpio/gpio{$pin}/direction"); |
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} |
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if ($invert) { |
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$inverted = intval($invert); |
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if (file_get_contents("/sys/class/gpio/gpio{$pin}/active_low") !== $inverted) { |
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system("echo {$inverted} > /sys/class/gpio/gpio{$pin}/active_low"); |
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} |
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} |
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if (file_exists("/sys/class/gpio/gpio{$pin}/direction") && (file_get_contents("/sys/class/gpio/gpio{$pin}/direction") == $direction)) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* Write a value to an output pin. |
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* |
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* @param int $pin The BCM pin number. |
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* @param int $value The output value (0,1) - Use GPIO::HIGH and GPIO::LOW |
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* @return bool |
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*/ |
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public function write(int $pin, int $value): bool |
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{ |
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system("echo {$value} > /sys/class/gpio/gpio{$pin}/value"); |
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if (!file_exists("/sys/class/gpio/gpio{$pin}/value")) { |
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return false; |
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} |
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if (file_get_contents("/sys/class/gpio/gpio{$pin}/value") != $value) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Read the value of an input/output pin. |
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* |
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* @param int $pin The BCM pin number |
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* @return int The current value of the pin. |
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* @throws GPIOException |
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*/ |
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public function read(int $pin): int |
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{ |
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if (!file_exists("/sys/class/gpio/gpio{$pin}/value")) { |
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throw new GPIOException("The pin value does not appear to be set, did you forget to run setDirection?"); |
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} |
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return intval(file_get_contents("/sys/class/gpio/gpio{$pin}/value")); |
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} |
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/** |
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* Exports the Pin (enabling it's use) |
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* |
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* @param int $pin The pin to export/enable. |
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* @return bool |
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*/ |
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private function export(int $pin): bool |
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{ |
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if (!file_exists("/sys/class/gpio/gpio{$pin}")) { |
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system("echo {$pin} > " . self::GPIO_PATH . "/export"); |
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if (file_exists("/sys/class/gpio/gpio{$pin}")) { |
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return true; |
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} |
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} |
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return false; |
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} |
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} |
allebb /
gpio
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