noccy/php-linux-gpio
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Improved sysfs file access code

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This commit is contained in:
Chris
2014-06-12 02:35:19 +02:00
parent 2304372129
commit b53cabec90
5 changed files with 162 additions and 27 deletions
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59
lib/GpioPin.php
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@ -19,6 +19,8 @@
namespace NoccyLabs\Gpio;
use NoccyLabs\Gpio\Exception\HardwareException;
use NoccyLabs\Sansi\Charset as CS;
/**
@ -41,10 +43,13 @@ class GpioPin
protected $handler;
protected $label;
protected $gpio;
public function __construct($pin)
public function __construct($pin, Gpio $gpio)
{
$this->pin = (int)$pin;
$this->gpio = $gpio;
$this->export();
$this->fd = fopen("/sys/class/gpio/gpio{$pin}/value", "rb");
}
@ -80,13 +85,24 @@ class GpioPin
{
return $this->value;
}
/**
* Set a descriptive label for the pin, used for debugging and troubleshooting.
*
* @param string $label
* @return NoccyLabs\Gpio\GpioPin
*/
public function setLabel($label)
{
$this->label = (string)$label;
return $this;
}
/**
* Get the assigned label for this pin.
*
* @return string The label
*/
public function getLabel()
{
return $this->label;
@ -94,9 +110,9 @@ class GpioPin
public function export()
{
@file_put_contents("/sys/class/gpio/export", $this->pin);
$this->sysfsWrite(null, "export", $this->pin);
if (!file_exists("/sys/class/gpio/gpio{$this->pin}")) {
throw new \Exception();
throw new HardwareException("Unable to export pin {$this->pin}");
}
return $this;
}
@ -107,23 +123,54 @@ class GpioPin
return $this;
}
public function sysfsWrite($pin, $file, $value)
{
if ($pin) {
$path = "/sys/class/gpio/gpio{$pin}/{$file}";
} else {
$path = "/sys/class/gpio/{$file}";
}
if (!is_writable($path)) {
throw new HardwareException("Sysfs file {$path} not writable");
}
$f = fopen($path,"w+");
if (!is_resource($f)) {
throw new HardwareException("Unable to write to sysfs file {$path}");
}
fwrite($f,$value);
fclose($f);
}
public function sysfsRead($pin, $file)
{
$path = "/sys/class/gpio/gpio{$pin}/{$file}";
$f = fopen($path,"r");
if (!is_resource($f)) {
throw new HardwareException("Unable to read from sysfs file {$path}");
}
$ret = fgets($f);
fclose($f);
return $ret;
}
public function setEdge($edge)
{
if (!in_array($edge, array("rising", "falling", "both", "none"))) {
throw new \Exception;
}
$this->edge = $edge;
@file_put_contents("/sys/class/gpio/gpio{$this->pin}/edge", $edge);
$this->sysfsWrite($this->pin, "edge", $edge);
return $this;
}
public function getEdge()
{
return $this->edge;
return $this->sysfsRead($this->pin, "edge");
}
public function setHandler(callable $handler=null)
{
$this->gpio->setInterruptHandler($this->pin, $this->fd);
return $this;
}