private DaisyLink(Socket socket, DaisyLinkModule module)
: base(socket, i2cDataPin, i2cClockPin, module)
{
Ready = false;
this.Socket = socket;
this.ReservedCount = 0;
this.NodeCount = 0;
// The link pin (port) is initialized as an input. It is only driven during initialization of the daisylinked modules.
// Setting the initial state to false insures that the pin will always drive low when Active is set to true.
//daisyLinkCpuPin = socket.ReservePin(daisyLinkPin, module);
daisyLinkResetPort = new GTI.DigitalIO(socket, daisyLinkPin, false, GTI.GlitchFilterMode.Off, GTI.ResistorMode.PullUp, module);
daisyLinkInterruptPort = null;
}
/// <summary>
/// Sends a reset pulse on the daisylink chain. This resets all DaisyLink nodes to INIT state, that is, waiting for a DaisyLink message.
/// </summary>
/// <remarks>
/// It is recommended to reboot the mainboard after calling this method because communication to the DaisyLink nodes will fail.
/// </remarks>
internal void SendResetPulse()
{
lock (portLock)
{
if (daisyLinkInterruptPort != null)
{
daisyLinkInterruptPort.Interrupt -= daisyLinkInterruptPort_OnInterrupt;
daisyLinkInterruptPort.Dispose(); // Ask hardware drivers to unreserve this pin
daisyLinkInterruptPort = null;
}
if (daisyLinkResetPort == null)
{
daisyLinkResetPort = new GTI.DigitalIO(Socket, daisyLinkPin, false, GTI.GlitchFilterMode.Off, GTI.ResistorMode.PullUp, null);
}
daisyLinkResetPort.IOMode = GTI.DigitalIO.IOModes.Output; // Should drive the neighbor bus high
Thread.Sleep(2); // 2 milliseconds is definitely more than 1 ms
daisyLinkResetPort.IOMode = GTI.DigitalIO.IOModes.Input; // Pull-downs should take the neighbor bus back low
daisyLinkResetPort.Dispose(); // Remove this pin from the hardware's reserved pin list
daisyLinkResetPort = null;
}
}
/// <summary>
/// Sends a reset pulse on the daisylink chain. This resets all DaisyLink nodes to INIT state, that is, waiting for a DaisyLink message.
/// </summary>
/// <remarks>
/// It is recommended to reboot the mainboard after calling this method because communication to the DaisyLink nodes will fail.
/// </remarks>
internal void SendResetPulse()
{
lock (portLock)
{
if (daisyLinkInterruptPort != null)
{
daisyLinkInterruptPort.Interrupt -= daisyLinkInterruptPort_OnInterrupt;
daisyLinkInterruptPort.Dispose(); // Ask hardware drivers to unreserve this pin
daisyLinkInterruptPort = null;
}
if (daisyLinkResetPort == null)
{
daisyLinkResetPort = new GTI.DigitalIO(Socket, daisyLinkPin, false, GTI.GlitchFilterMode.Off, GTI.ResistorMode.PullUp, null);
}
daisyLinkResetPort.IOMode = GTI.DigitalIO.IOModes.Output; // Should drive the neighbor bus high
Thread.Sleep(2); // 2 milliseconds is definitely more than 1 ms
daisyLinkResetPort.IOMode = GTI.DigitalIO.IOModes.Input; // Pull-downs should take the neighbor bus back low
daisyLinkResetPort.Dispose(); // Remove this pin from the hardware's reserved pin list
daisyLinkResetPort = null;
}
}
private DaisyLink(Socket socket, DaisyLinkModule module)
: base(socket, i2cDataPin, i2cClockPin, module)
{
Ready = false;
this.Socket = socket;
this.ReservedCount = 0;
this.NodeCount = 0;
// The link pin (port) is initialized as an input. It is only driven during initialization of the daisylinked modules.
// Setting the initial state to false insures that the pin will always drive low when Active is set to true.
//daisyLinkCpuPin = socket.ReservePin(daisyLinkPin, module);
daisyLinkResetPort = new GTI.DigitalIO(socket, daisyLinkPin, false, GTI.GlitchFilterMode.Off, GTI.ResistorMode.PullUp, module);
daisyLinkInterruptPort = null;
}
// Note: A constructor summary is auto-generated by the doc builder.
/// <summary></summary>
/// <remarks>This automatically checks that the socket supports Type X or Y as appropriate, and reserves the SDA and SCL pins.
/// An exception will be thrown if there is a problem with these checks.</remarks>
/// <param name="socket">The socket for this software I2C device interface.</param>
/// <param name="sdaPin">The socket pin used for I2C data.</param>
/// <param name="sclPin">The socket pin used for I2C clock.</param>
/// <param name="module">The module using this I2C interface, which can be null if unspecified.</param>
public SoftwareI2C(Socket socket, Socket.Pin sdaPin, Socket.Pin sclPin, Module module)
{
// first check the socket is compatible
if (sclPin > Socket.Pin.Five || sdaPin > Socket.Pin.Five)
{
socket.EnsureTypeIsSupported('Y', module);
}
else
{
socket.EnsureTypeIsSupported(new char[] { 'X', 'Y' }, module);
}
if (ForceManagedSoftwareI2CImplementation || socket.NativeI2CWriteRead == null)
{
usingManaged = true;
}
// then see if we've already reserved the pins and got instances of the ports, otherwise do that.
string sdaPinString = socket.ToString() + "___" + sdaPin;
if (!ReservedSdaPinPorts.Contains(sdaPinString))
{
if (usingManaged)
{
sdaPort = new DigitalIO(socket, sdaPin, false, GlitchFilterMode.Off, ForceManagedPullUps ? ResistorMode.PullUp : ResistorMode.Disabled, module);
}
ReservedSdaPinPorts.Add(sdaPinString, sdaPort);
}
else
{
sdaPort = (DigitalIO)ReservedSdaPinPorts[sdaPinString];
}
string sclPinString = socket.ToString() + "___" + sclPin;
if (!ReservedSclPinPorts.Contains(sclPinString))
{
if (usingManaged)
{
sclPort = new DigitalIO(socket, sclPin, false, GlitchFilterMode.Off, ForceManagedPullUps ? ResistorMode.PullUp : ResistorMode.Disabled, module);
}
ReservedSclPinPorts.Add(sclPinString, sclPort);
}
else
{
sclPort = (DigitalIO)ReservedSclPinPorts[sclPinString];
}
this.socket = socket;
this.sdaPin = sdaPin;
this.sclPin = sclPin;
if (usingManaged)
{
lock (SoftwareI2CTimeoutList)
{
timeoutCount = -1; // Prevent the TimeoutHandler thread from watching this port for now
SoftwareI2CTimeoutList.Add(this);
if (timeoutThread == null)
{
threadExit = false;
timeoutThread = new Thread(new ThreadStart(TimeoutHandler));
timeoutThread.Start();
}
}
}
}
// Note: A constructor summary is auto-generated by the doc builder.
/// <summary></summary>
/// <remarks>This automatically checks that the socket supports Type X or Y as appropriate, and reserves the SDA and SCL pins.
/// An exception will be thrown if there is a problem with these checks.</remarks>
/// <param name="socket">The socket for this software I2C device interface.</param>
/// <param name="sdaPin">The socket pin used for I2C data.</param>
/// <param name="sclPin">The socket pin used for I2C clock.</param>
/// <param name="module">The module using this I2C interface, which can be null if unspecified.</param>
public SoftwareI2C(Socket socket, Socket.Pin sdaPin, Socket.Pin sclPin, Module module)
{
// first check the socket is compatible
if (sclPin > Socket.Pin.Five || sdaPin > Socket.Pin.Five)
{
socket.EnsureTypeIsSupported('Y', module);
}
else
{
socket.EnsureTypeIsSupported(new char[] { 'X', 'Y' }, module);
}
if (ForceManagedSoftwareI2CImplementation || socket.NativeI2CWriteRead == null) usingManaged = true;
// then see if we've already reserved the pins and got instances of the ports, otherwise do that.
string sdaPinString = socket.ToString() + "___" + sdaPin;
if (!ReservedSdaPinPorts.Contains(sdaPinString))
{
if (usingManaged)
{
sdaPort = new DigitalIO(socket, sdaPin, false, GlitchFilterMode.Off, ForceManagedPullUps ? ResistorMode.PullUp : ResistorMode.Disabled, module);
}
ReservedSdaPinPorts.Add(sdaPinString, sdaPort);
}
else
{
sdaPort = (DigitalIO)ReservedSdaPinPorts[sdaPinString];
}
string sclPinString = socket.ToString() + "___" + sclPin;
if (!ReservedSclPinPorts.Contains(sclPinString))
{
if (usingManaged)
{
sclPort = new DigitalIO(socket, sclPin, false, GlitchFilterMode.Off, ForceManagedPullUps ? ResistorMode.PullUp : ResistorMode.Disabled, module);
}
ReservedSclPinPorts.Add(sclPinString, sclPort);
}
else
{
sclPort = (DigitalIO)ReservedSclPinPorts[sclPinString];
}
this.socket = socket;
this.sdaPin = sdaPin;
this.sclPin = sclPin;
if (usingManaged)
{
lock (SoftwareI2CTimeoutList)
{
timeoutCount = -1; // Prevent the TimeoutHandler thread from watching this port for now
SoftwareI2CTimeoutList.Add(this);
if (timeoutThread == null)
{
threadExit = false;
timeoutThread = new Thread(new ThreadStart(TimeoutHandler));
timeoutThread.Start();
}
}
}
}
