public void Setup()
{
if (setup)
{
return;
}
// get file descriptor for /dev/mem
devMemFileDescriptor = Syscall.open(DevMemFilePath, OpenFlags.O_RDWR | OpenFlags.O_SYNC);
var gpioMem = Stdlib.malloc(BLOCK_SIZE + (PAGE_SIZE - 1));
var gpioMemInt = gpioMem.ToInt32();
if ((gpioMemInt % PAGE_SIZE) == 1)
{
gpioMem = IntPtr.Add(gpioMem, PAGE_SIZE - (gpioMemInt % PAGE_SIZE));
}
var periBase = GetPeriBase();
var gpioBase = (periBase == 0 ? BCM2708_PERI_BASE_DEFAULT : periBase) + GPIO_BASE_OFFSET;
gpioMap = Syscall.mmap(gpioMem, BLOCK_SIZE, MmapProts.PROT_READ | MmapProts.PROT_WRITE,
MmapFlags.MAP_SHARED, devMemFileDescriptor, gpioBase);
setup = true;
}
public static IntPtr AllocHeap(long size)
{
if (size < (long)0)
{
throw new ArgumentOutOfRangeException("size", "< 0");
}
return(Stdlib.malloc((ulong)size));
}
private static IPAddress PtrToAddress(IntPtr ptr)
{
IPAddress address = null;
if (ptr != IntPtr.Zero)
{
IntPtr buf = Stdlib.malloc(256);
IntPtr addrPtr = avahi_address_snprint(buf, 256, ptr);
address = IPAddress.Parse(GLib.Marshaller.Utf8PtrToString(addrPtr));
Stdlib.free(addrPtr);
}
return(address);
}
internal IntPtr GetDataPointer()
{
if (Data1 == null && Data2 == null && Data3 == null)
{
return(IntPtr.Zero);
}
var payload = new Payload();
#if !ObjectPointersPinnedByDefault
if (!DataIsAccessibleToNative)
#endif
{
payload.data1 = Util.SerializeToPointer(Data1);
payload.data2 = Util.SerializeToPointer(Data2);
payload.data3 = Util.SerializeToPointer(Data3);
}
#if !ObjectPointersPinnedByDefault
else
{
payload.data1 = Util.SerializeToPointer(Data1, GCHandleType.Pinned);
payload.data2 = Util.SerializeToPointer(Data2, GCHandleType.Pinned);
payload.data3 = Util.SerializeToPointer(Data3, GCHandleType.Pinned);
}
#endif
var result = Stdlib.malloc((ulong)Marshal.SizeOf(payload));
if (result == IntPtr.Zero)
{
Util.FreeSerializePointer(payload.data1);
Util.FreeSerializePointer(payload.data2);
Util.FreeSerializePointer(payload.data3);
return(IntPtr.Zero);
}
Marshal.StructureToPtr(payload, result, false);
BPS.RegisterSerializedPointer(payload.data1);
BPS.RegisterSerializedPointer(payload.data2);
BPS.RegisterSerializedPointer(payload.data3);
return(result);
}