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Fix of a permission denied error caused by delay of GPIO pin exporting. #24

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Fix of a permission denied error caused by delay of GPIO pin exporting. #24

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3 changes: 3 additions & 0 deletions src/PhpGpio/Gpio.php
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Original file line number Diff line number Diff line change
Expand Up @@ -98,6 +98,9 @@ public function setup($pinNo, $direction)
// Export pin
file_put_contents(GpioInterface::PATH_EXPORT, $pinNo);

// wait until pin is ready
while(!is_writable(GpioInterface::PATH_GPIO.$pinNo)) { /* empty */ }

// if valid direction then set direction
if ($this->isValidDirection($direction)) {
file_put_contents(GpioInterface::PATH_GPIO.$pinNo.'/direction', $direction);
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