private unsafe void Initialize()
{
if (_deviceFileDescriptor >= 0)
{
return;
}
lock (s_initializationLock)
{
// -1 means ignore Chip Select Line
int chipSelectLine = _settings.ChipSelectLine == -1 ? 0 : _settings.ChipSelectLine;
string deviceFileName = $"{DevicePath}{_settings.BusId}.{chipSelectLine}";
if (_deviceFileDescriptor >= 0)
{
return;
}
_deviceFileDescriptor = Interop.open(deviceFileName, FileOpenFlags.O_RDWR);
if (_deviceFileDescriptor < 0)
{
throw new IOException($"Error {Marshal.GetLastWin32Error()}. Can not open SPI device file '{deviceFileName}'.");
}
UnixSpiMode mode = SpiSettingsToUnixSpiMode();
IntPtr nativePtr = new IntPtr(&mode);
int result = Interop.ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_MODE, nativePtr);
if (result == -1)
{
throw new IOException($"Error {Marshal.GetLastWin32Error()}. Can not set SPI mode to {_settings.Mode}.");
}
byte dataLengthInBits = (byte)_settings.DataBitLength;
nativePtr = new IntPtr(&dataLengthInBits);
result = Interop.ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_BITS_PER_WORD, nativePtr);
if (result == -1)
{
throw new IOException($"Error {Marshal.GetLastWin32Error()}. Can not set SPI data bit length to {_settings.DataBitLength}.");
}
int clockFrequency = _settings.ClockFrequency;
nativePtr = new IntPtr(&clockFrequency);
result = Interop.ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_MAX_SPEED_HZ, nativePtr);
if (result == -1)
{
throw new IOException($"Error {Marshal.GetLastWin32Error()}. Can not set SPI clock frequency to {_settings.ClockFrequency}.");
}
}
}
private UnixSpiMode SpiSettingsToUnixSpiMode()
{
UnixSpiMode mode = SpiModeToUnixSpiMode(_settings.Mode);
if (_settings.ChipSelectLineActiveState == PinValue.High)
{
mode |= UnixSpiMode.SPI_CS_HIGH;
}
if (_settings.DataFlow == DataFlow.LsbFirst)
{
mode |= UnixSpiMode.SPI_LSB_FIRST;
}
return(mode);
}
private unsafe void Initialize()
{
if (_deviceFileDescriptor >= 0)
{
return;
}
lock (s_InitializationLock)
{
string deviceFileName = $"{DevicePath}{_settings.BusId}.{_settings.ChipSelectLine}";
if (_deviceFileDescriptor >= 0)
{
return;
}
_deviceFileDescriptor = Interop.open(deviceFileName, FileOpenFlags.O_RDWR);
if (_deviceFileDescriptor < 0)
{
throw new IOException($"Cannot open Spi device file '{deviceFileName}'");
}
UnixSpiMode mode = SpiModeToUnixSpiMode(_settings.Mode);
IntPtr nativePtr = new IntPtr(&mode);
int result = Interop.ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_MODE, nativePtr);
if (result == -1)
{
throw new IOException($"Cannot set Spi mode to {_settings.Mode}");
}
byte dataLengthInBits = (byte)_settings.DataBitLength;
nativePtr = new IntPtr(&dataLengthInBits);
result = Interop.ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_BITS_PER_WORD, nativePtr);
if (result == -1)
{
throw new IOException($"Cannot set Spi data bit length to {_settings.DataBitLength}");
}
int clockFrequency = _settings.ClockFrequency;
nativePtr = new IntPtr(&clockFrequency);
result = Interop.ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_MAX_SPEED_HZ, nativePtr);
if (result == -1)
{
throw new IOException($"Cannot set Spi clock frequency to {_settings.ClockFrequency}");
}
}
}
private unsafe void Initialize()
{
if (_deviceFileDescriptor >= 0)
{
return;
}
string deviceFileName = $"{DevicePath}{_settings.BusId}.{_settings.ChipSelectLine}";
_deviceFileDescriptor = open(deviceFileName, FileOpenFlags.O_RDWR);
if (_deviceFileDescriptor < 0)
{
throw Utils.CreateIOException($"Cannot open Spi device file '{deviceFileName}'", _deviceFileDescriptor);
}
UnixSpiMode mode = SpiModeToUnixSpiMode(_settings.Mode);
var ptr = new IntPtr(&mode);
int ret = ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_MODE, ptr);
if (ret == -1)
{
throw Utils.CreateIOException($"Cannot set Spi mode to '{_settings.Mode}'", ret);
}
byte bits = (byte)_settings.DataBitLength;
ptr = new IntPtr(&bits);
ret = ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_BITS_PER_WORD, ptr);
if (ret == -1)
{
throw Utils.CreateIOException($"Cannot set Spi data bit length to '{_settings.DataBitLength}'", ret);
}
uint speed = _settings.ClockFrequency;
ptr = new IntPtr(&speed);
ret = ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_MAX_SPEED_HZ, ptr);
if (ret == -1)
{
throw Utils.CreateIOException($"Cannot set Spi clock frequency to '{_settings.ClockFrequency}'", ret);
}
}
/// <summary>
/// Initialize an SPI device
/// </summary>
/// <param name="devNode">Path to the /dev node</param>
/// <param name="speed">Transfer speed in Hz</param>
/// <param name="transferMode">Transfer mode</param>
public unsafe SpiDevice(string devNode, int speed, int transferMode)
{
_speed = (uint)speed;
_deviceFileDescriptor = Interop.open(devNode, FileOpenFlags.O_RDWR);
if (_deviceFileDescriptor < 0)
{
throw new IOException($"Error {Marshal.GetLastWin32Error()}. Can not open SPI device file '{devNode}'.");
}
UnixSpiMode mode = transferMode switch
{
0 => UnixSpiMode.SPI_MODE_0,
1 => UnixSpiMode.SPI_MODE_1,
2 => UnixSpiMode.SPI_MODE_2,
3 => UnixSpiMode.SPI_MODE_3,
_ => throw new ArgumentException($"Transfer mode '{transferMode}' not regignized. Must be between 0 and 3."),
};
IntPtr nativePtr = new IntPtr(&mode);
int result = Interop.ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_MODE, nativePtr);
if (result == -1)
{
throw new IOException($"Error {Marshal.GetLastWin32Error()}. Can not set SPI mode to {mode}.");
}
byte dataLengthInBits = 8;
nativePtr = new IntPtr(&dataLengthInBits);
result = Interop.ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_BITS_PER_WORD, nativePtr);
if (result == -1)
{
throw new IOException($"Error {Marshal.GetLastWin32Error()}. Can not set SPI data bit length to 8.");
}
nativePtr = new IntPtr(&speed);
result = Interop.ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_MAX_SPEED_HZ, nativePtr);
if (result == -1)
{
throw new IOException($"Error {Marshal.GetLastWin32Error()}. Can not set SPI clock frequency to {speed}.");
}
}
/// <summary>
/// Initialize an SPI device
/// </summary>
/// <param name="devNode">Path to the /dev node</param>
/// <param name="speed">Transfer speed in Hz</param>
public unsafe SpiDevice(string devNode, int speed)
{
_speed = (uint)speed;
_deviceFileDescriptor = Interop.open(devNode, FileOpenFlags.O_RDWR);
if (_deviceFileDescriptor < 0)
{
throw new IOException($"Error {Marshal.GetLastWin32Error()}. Can not open SPI device file '{devNode}'.");
}
UnixSpiMode mode = UnixSpiMode.SPI_MODE_0;
IntPtr nativePtr = new IntPtr(&mode);
int result = Interop.ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_MODE, nativePtr);
if (result == -1)
{
throw new IOException($"Error {Marshal.GetLastWin32Error()}. Can not set SPI mode to {mode}.");
}
byte dataLengthInBits = 8;
nativePtr = new IntPtr(&dataLengthInBits);
result = Interop.ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_BITS_PER_WORD, nativePtr);
if (result == -1)
{
throw new IOException($"Error {Marshal.GetLastWin32Error()}. Can not set SPI data bit length to 8.");
}
nativePtr = new IntPtr(&speed);
result = Interop.ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_MAX_SPEED_HZ, nativePtr);
if (result == -1)
{
throw new IOException($"Error {Marshal.GetLastWin32Error()}. Can not set SPI clock frequency to {speed}.");
}
}
private unsafe void Initialize()
{
if (_deviceFileDescriptor >= 0)
{
return;
}
lock (s_initializationLock)
{
// -1 means ignore Chip Select Line
int chipSelectLine = _settings.ChipSelectLine == -1 ? 0 : _settings.ChipSelectLine;
string deviceFileName = $"{DevicePath}{_settings.BusId}.{chipSelectLine}";
if (_deviceFileDescriptor >= 0)
{
return;
}
_deviceFileDescriptor = Interop.open(deviceFileName, FileOpenFlags.O_RDWR);
if (_deviceFileDescriptor < 0)
{
throw new IOException($"Error {Marshal.GetLastWin32Error()}. Can not open SPI device file '{deviceFileName}'.");
}
UnixSpiMode mode = SpiSettingsToUnixSpiMode();
IntPtr nativePtr = new IntPtr(&mode);
int result = Interop.ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_MODE, nativePtr);
if (result == -1)
{
// We should try the other mode and invert the buffers manually
// RPI can't open Mode0 in LSB for example
if (_settings.DataFlow == DataFlow.LsbFirst)
{
mode &= ~UnixSpiMode.SPI_LSB_FIRST;
}
else
{
mode |= UnixSpiMode.SPI_LSB_FIRST;
}
nativePtr = new IntPtr(&mode);
result = Interop.ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_MODE, nativePtr);
if (result == -1)
{
throw new IOException($"Error {Marshal.GetLastWin32Error()}. Can not set SPI mode to {_settings.Mode}.");
}
_isInverted = true;
}
byte dataLengthInBits = (byte)_settings.DataBitLength;
nativePtr = new IntPtr(&dataLengthInBits);
result = Interop.ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_BITS_PER_WORD, nativePtr);
if (result == -1)
{
throw new IOException($"Error {Marshal.GetLastWin32Error()}. Can not set SPI data bit length to {_settings.DataBitLength}.");
}
int clockFrequency = _settings.ClockFrequency;
nativePtr = new IntPtr(&clockFrequency);
result = Interop.ioctl(_deviceFileDescriptor, (uint)SpiSettings.SPI_IOC_WR_MAX_SPEED_HZ, nativePtr);
if (result == -1)
{
throw new IOException($"Error {Marshal.GetLastWin32Error()}. Can not set SPI clock frequency to {_settings.ClockFrequency}.");
}
}
}
