/// <summary>
/// Initializes a new instance of the <see cref="MemoryGpioConnectionDriver"/> class.
/// </summary>
public MemoryGpioConnectionDriver()
{
using (var memoryFile = UnixFile.Open("/dev/mem", UnixFileMode.ReadWrite | UnixFileMode.Synchronized)) {
gpioAddress = MemoryMap.Create(
IntPtr.Zero,
Interop.BCM2835_BLOCK_SIZE,
MemoryProtection.ReadWrite,
MemoryFlags.Shared,
memoryFile.Descriptor,
GetProcessorBaseAddress(Board.Current.Processor));
}
}
/// <summary>
/// Initializes a new instance of the <see cref="GpioConnectionDriver"/> class.
/// </summary>
public GpioConnectionDriver()
{
using (var memoryFile = UnixFile.Open("/dev/mem", UnixFileMode.ReadWrite | UnixFileMode.Synchronized)) {
gpioAddress = MemoryMap.Create(
IntPtr.Zero,
Interop.BCM2835_BLOCK_SIZE,
MemoryProtection.ReadWrite,
MemoryFlags.Shared,
memoryFile.Descriptor,
Board.Current.Model == '2' ? Interop.BCM2836_GPIO_BASE : Interop.BCM2835_GPIO_BASE);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="GpioConnectionDriver" /> class.
/// </summary>
/// <param name="threadFactory">The thread factory.</param>
public GpioConnectionDriver(IThreadFactory threadFactory = null)
{
this.thread = ThreadFactory.EnsureThreadFactory(threadFactory).Create();
using (var memoryFile = UnixFile.Open("/dev/mem", UnixFileMode.ReadWrite | UnixFileMode.Synchronized))
{
this.gpioAddress = MemoryMap.Create(
IntPtr.Zero,
Interop.Bcm2835BlockSize,
MemoryProtection.ReadWrite,
MemoryFlags.Shared,
memoryFile.Descriptor,
GetProcessorBaseAddress(Board.Current.Processor));
}
}
private void InitializePoll(ProcessorPin pin)
{
lock (polls)
{
PinPoll poll;
if (polls.TryGetValue(pin, out poll))
{
return;
}
var pinPoll = new PinPoll();
pinPoll.PollDescriptor = Interop.epoll_create(1);
if (pinPoll.PollDescriptor < 0)
{
throw new IOException("Call to epoll_create(1) API failed with the following return value: " + pinPoll.PollDescriptor);
}
var valuePath = Path.Combine(gpioPath, string.Format("gpio{0}/value", (int)pin));
pinPoll.FileDescriptor = UnixFile.OpenFileDescriptor(valuePath, UnixFileMode.ReadOnly | UnixFileMode.NonBlocking);
var ev = new Interop.epoll_event
{
events = (Interop.EPOLLIN | Interop.EPOLLET | Interop.EPOLLPRI),
data = new Interop.epoll_data {
fd = pinPoll.FileDescriptor
}
};
pinPoll.InEventPtr = Marshal.AllocHGlobal(64);
Marshal.StructureToPtr(ev, pinPoll.InEventPtr, false);
var controlResult = Interop.epoll_ctl(pinPoll.PollDescriptor, Interop.EPOLL_CTL_ADD, pinPoll.FileDescriptor, pinPoll.InEventPtr);
if (controlResult != 0)
{
throw new IOException("Call to epoll_ctl(EPOLL_CTL_ADD) API failed with the following return value: " + controlResult);
}
pinPoll.OutEventPtr = Marshal.AllocHGlobal(64);
polls[pin] = pinPoll;
}
}
private void InitializePoll(ProcessorPin pin)
{
lock (this.pinPolls)
{
if (this.pinPolls.TryGetValue(pin, out var poll))
{
return;
}
var pinPoll = default(PinPoll);
pinPoll.PollDescriptor = Interop.Epoll_create(1);
if (pinPoll.PollDescriptor < 0)
{
throw new IOException("Call to epoll_create(1) API failed with the following return value: " + pinPoll.PollDescriptor);
}
var valuePath = Path.Combine(GpioPath, string.Format("gpio{0}/value", (int)pin));
pinPoll.FileDescriptor = UnixFile.OpenFileDescriptor(valuePath, UnixFileMode.ReadOnly | UnixFileMode.NonBlocking);
var ev = new Interop.EpollEvent
{
Events = Interop.Epollin | Interop.Epollet | Interop.Epollpri,
Data = new Interop.EpollData {
Fd = pinPoll.FileDescriptor
},
};
pinPoll.InEventPtr = Marshal.AllocHGlobal(64);
Marshal.StructureToPtr(ev, pinPoll.InEventPtr, false);
var controlResult = Interop.Epoll_ctl(pinPoll.PollDescriptor, Interop.EpollCtlAdd, pinPoll.FileDescriptor, pinPoll.InEventPtr);
if (controlResult != 0)
{
throw new IOException("Call to epoll_ctl(EPOLL_CTL_ADD) API failed with the following return value: " + controlResult);
}
pinPoll.OutEventPtr = Marshal.AllocHGlobal(64);
this.pinPolls[pin] = pinPoll;
}
}
private void UninitializePoll(ProcessorPin pin)
{
if (pinPolls.TryGetValue(pin, out PinPoll poll))
{
pinPolls.Remove(pin);
var controlResult = poll.InEventPtr != IntPtr.Zero ? OP.epoll_ctl(poll.PollDescriptor, OP.EPOLL_CTL_DEL, poll.FileDescriptor, poll.InEventPtr) : 0;
Marshal.FreeHGlobal(poll.InEventPtr);
Marshal.FreeHGlobal(poll.OutEventPtr);
UnixFile.CloseFileDescriptor(poll.PollDescriptor);
UnixFile.CloseFileDescriptor(poll.FileDescriptor);
if (controlResult != 0)
{
throw new IOException("Call to epoll_ctl(EPOLL_CTL_DEL) API failed with the following return value: " + controlResult);
}
}
}
