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linux_gpio: check if pin is already exported

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Signed-off-by: Nicolae Rosia <nicolae.rosia@gmail.com>
This commit is contained in:
Nicolae Rosia
2017-05-18 23:09:44 +02:00
committed by Lorenz Meier
parent b82a0f988e
commit 99d4f70ef8
1 changed files with 5 additions and 0 deletions
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src/drivers/linux_gpio/linux_gpio.cpp
+5
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@@ -78,6 +78,11 @@ int LinuxGPIO::_exportPin(unsigned int pin)
int ret;
int bytes_to_write;
if (_readValue(pin) != -1) {
/* GPIO is already exported */
return 0;
}
fd = open("/sys/class/gpio/export", O_WRONLY);
if (fd == -1) {