private void openEdgeDetectionFileHandle()
{
// close Handle if open
if (this.deviceHandle != 0)
{
try
{
FCntl.close(this.deviceHandle);
}
finally
{
this.deviceHandle = 0;
}
}
// open Handle readonly
var result = FCntl.open(this.deviceName, FCntl.O_RDONLY);
if (result < 0)
{
throw new IOException(string.Format("Failed to open device - error {0}.", result));
}
this.deviceHandle = result;
// clear pending interrupts
readBufs(this.deviceHandle);
}
private void setEdgeDetection(byte pin, EdgeDetectionMode edge)
{
if (edge == EdgeDetectionMode.none)
{
// open file handle to gpio export
var fd = FCntl.open("/sys/class/gpio/unexport", FCntl.O_WRONLY);
if (fd < 0)
{
throw new IOException(string.Format("Failed to open gpio class - error {0}.", fd));
}
// write pin number to export gpio pin
// (don't check for errors because it raises if already unexported..)
var buf = System.Text.UTF8Encoding.UTF8.GetBytes(pin.ToString() + Environment.NewLine);
UniStd.write(fd, buf, Convert.ToUInt32(buf.Length));
FCntl.close(fd);
}
else
{
// open file handle to gpio export
var fd = FCntl.open("/sys/class/gpio/export", FCntl.O_WRONLY);
if (fd < 0)
{
throw new IOException(string.Format("Failed to open gpio class - error {0}.", fd));
}
// write pin number to export gpio pin
// (don't check for errors because it raises if already exported..)
var buf = System.Text.UTF8Encoding.UTF8.GetBytes(pin.ToString() + Environment.NewLine);
UniStd.write(fd, buf, Convert.ToUInt32(buf.Length));
FCntl.close(fd);
// wait short delay for export to complete
System.Threading.Thread.Sleep(50);
// open file handle to gpio direction
fd = FCntl.open(String.Format("/sys/class/gpio/gpio{0}/direction", pin), FCntl.O_WRONLY);
if (fd < 0)
{
throw new IOException(string.Format("Failed to open gpio direction - error {0}.", fd));
}
// write pin number to export gpio direction
buf = System.Text.UTF8Encoding.UTF8.GetBytes("in" + Environment.NewLine);
UniStd.write(fd, buf, Convert.ToUInt32(buf.Length));
FCntl.close(fd);
// open file handle to gpio edge
fd = FCntl.open(String.Format("/sys/class/gpio/gpio{0}/edge", pin), FCntl.O_WRONLY);
if (fd < 0)
{
throw new IOException(string.Format("Failed to open gpio edge - error {0}.", fd));
}
// write pin number to export gpio direction
buf = System.Text.UTF8Encoding.UTF8.GetBytes(edge.ToString() + Environment.NewLine);
UniStd.write(fd, buf, Convert.ToUInt32(buf.Length));
FCntl.close(fd);
}
}
public void Open(int flags)
{
if (this.DeviceHandle != 0)
{
throw new IOException("Device is already open.");
}
var result = FCntl.open(this.DeviceName, flags);
if (result < 0)
{
throw new IOException(string.Format("Failed to open device - error {0}.", result));
}
this.DeviceHandle = result;
this.InitTxRxBuffers();
}
public void Open(uint mode)
{
if (this.DeviceHandle != 0)
{
throw new System.IO.IOException("Device is already open.");
}
var result = FCntl.open(this.DeviceName, FCntl.O_RDWR);
if (result < 0)
{
throw new System.IO.IOException("Failed to open device.");
}
this.DeviceHandle = result;
this.InitTxRxBuffers();
}