/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Gets the port value
///
/// This is really just doing the equivalent of a shell command
/// echo <value_as_string> > /sys/class/gpio/gpio<gpioID>/value
///
/// </summary>
/// <returns>true or false - the ports value</returns>
/// <history>
/// 28 Aug 14 Cynic - Originally written
/// </history>
public bool Read()
{
string outStr = System.IO.File.ReadAllText(BBBDefinitions.SYSFS_GPIODIR + BBBDefinitions.SYSFS_GPIODIRNAMEBASE + GpioUtils.GpioIDToString(GpioID) + "/" + BBBDefinitions.SYSFS_GPIOVALUE);
if (outStr.Trim() == "0")
{
return(false);
}
else
{
return(true);
}
}
/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Sets the port value
///
/// This is really just doing the equivalent of a shell command
/// echo <value_as_string> > /sys/class/gpio/gpio<gpioID>/value
///
/// </summary>
/// <param name="valueToSet>the value to set/param>
/// <history>
/// 28 Aug 14 Cynic - Originally written
/// </history>
public void Write(bool valueToSet)
{
string valueStr;
if (valueToSet == true)
{
valueStr = "1";
}
else
{
valueStr = "0";
}
// set the value now
System.IO.File.WriteAllText(BBBDefinitions.SYSFS_GPIODIR + BBBDefinitions.SYSFS_GPIODIRNAMEBASE + GpioUtils.GpioIDToString(GpioID) + "/" + BBBDefinitions.SYSFS_GPIOVALUE, valueStr);
}
/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Constructor
/// </summary>
/// <param name="gpioIDIn">The gpio we open the port on</param>
/// <history>
/// 28 Aug 14 Cynic - Originally written
/// </history>
public Port(GpioEnum gpioIDIn)
{
// set our GpioConfig object now
gpioCfgObject = GpioUtils.GetGpioConfigForGpio(gpioIDIn);
}
/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Closes the port. Throws an exception on failure, including if the port is
/// already closed
///
/// This is really just doing the equivalent of a shell command
/// echo <gpioID> > /sys/class/gpio/unexport
/// after which the /sys/class/gpio/gpio<gpioID> directory should not exist.
///
/// </summary>
/// <history>
/// 28 Aug 14 Cynic - Originally written
/// </history>
public override void ClosePort()
{
// do the close
System.IO.File.WriteAllText(BBBDefinitions.SYSFS_GPIODIR + BBBDefinitions.SYSFS_GPIOUNEXPORT, GpioUtils.GpioIDToString(GpioID));
}
// #########################################################################
// ### Port Manipulation Code
// #########################################################################
#region
/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Opens the port. Throws an exception on failure, including if the port is
/// already open.
///
/// This is really just doing the equivalent of a shell command
/// echo <gpioID> > /sys/class/gpio/export
/// after which the /sys/class/gpio/gpio<gpioID> directory should exist.
/// If it already exists the port is in use by someone else
///
/// </summary>
/// <history>
/// 28 Aug 14 Cynic - Originally written
/// </history>
protected override void OpenPort()
{
// some tests
if (GpioID == GpioEnum.GPIO_NONE)
{
throw new Exception("Cannot open port. Invalid port: " + GpioID.ToString());
}
// do the open
System.IO.File.WriteAllText(BBBDefinitions.SYSFS_GPIODIR + BBBDefinitions.SYSFS_GPIOEXPORT, GpioUtils.GpioIDToString(GpioID));
}
/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Sets the port direction at the SysFs level
///
/// This is really just doing the equivalent of a shell command
/// echo <direction_as_string> > /sys/class/gpio/gpio<gpioID>/direction
///
/// </summary>
/// <param name="portDirIn">the port direction INPUT/OUTPUT</param>
/// <history>
/// 28 Aug 14 Cynic - Originally written
/// </history>
protected void SetSysFsDirection()
{
string dirStr;
if (PortDirection() == PortDirectionEnum.PORTDIR_INPUT)
{
dirStr = "in";
}
else if (PortDirection() == PortDirectionEnum.PORTDIR_OUTPUT)
{
dirStr = "out";
}
else
{
// should never happen
throw new Exception("unknown port direction:" + PortDirection().ToString());
}
// set the direction now
System.IO.File.WriteAllText(BBBDefinitions.SYSFS_GPIODIR + BBBDefinitions.SYSFS_GPIODIRNAMEBASE + GpioUtils.GpioIDToString(GpioID) + "/" + BBBDefinitions.SYSFS_GPIODIRECTION, dirStr);
}