noccy/php-linux-gpio
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Added bugfix to prevent access errors on newly exported pin control files

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This commit is contained in:
Chris 2014-06-13 12:01:36 +00:00
parent 17dd85f828
commit f19a5bcea8
2 changed files with 19 additions and 4 deletions
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8
examples/bitmap.php
View File

@ -33,4 +33,12 @@ for($n = 1; $n < 16; $n++) {
usleep(500000);
}
for($m = 0; $m < 20; $m++) {
foreach(array(0, 0, 12, 14, 15, 7, 3, 1, 0) as $n) {
$par->write($n);
usleep(100000);
}
}
$par->write(0);

15
lib/GpioPin.php
View File

@ -155,12 +155,19 @@ class GpioPin
} else {
$path = "/sys/class/gpio/{$file}";
}
if (!is_writable($path)) {
throw new HardwareException("Sysfs file {$path} not writable");
if (!file_exists($path)) {
throw new HardwareException("Sysfs file {$path} does not exist");
}
$f = fopen($path,"w+");
$ts = microtime(true);
while ((!is_writable($path)) && (microtime(true) < $ts+1)) {
usleep(10000);
}
$f = @fopen($path,"c");
if (!is_resource($f)) {
throw new HardwareException("Unable to write to sysfs file {$path}");
$err = error_get_last();
throw new HardwareException("Unable to write to sysfs file {$path}: ".$err['message']);
}
fwrite($f,$value);
fclose($f);