/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Enables the SPI slave device. Will throw exceptions if it cannot open the
/// device
/// </summary>
/// <returns>ssHandle - the handle for the Slave Device or null for fail</returns>
/// <param name="spiSlaveDeviceIn">The SPI Slave Device we are configuring</param>
/// <history>
/// 21 Dec 14 Cynic - Originally written
/// </history>
public SPISlaveDeviceHandle EnableSPISlaveDevice(SPISlaveDeviceEnum spiSlaveDeviceIn)
{
string deviceFileName;
// set up now
deviceFileName = BBBDefinitions.SPIDEV_FILENAME;
// set up the spi device number, this is based off the port
// NOTE that SPI port 0 goes to /dev/spidev1.x and SPI port 1
// goes to /dev/spidev2.x. That is just the way it is
if (SPIPort == SPIPortEnum.SPIPORT_0)
{
deviceFileName = deviceFileName.Replace("%device%", "1");
}
else if (SPIPort == SPIPortEnum.SPIPORT_1)
{
deviceFileName = deviceFileName.Replace("%device%", "2");
}
else
{
// should never happen
throw new Exception("Unknown SPI Port:" + SPIPort.ToString());
}
// set up the spi slave number
if (spiSlaveDeviceIn == SPISlaveDeviceEnum.SPI_SLAVEDEVICE_CS0)
{
deviceFileName = deviceFileName.Replace("%slave%", "0");
}
else if (spiSlaveDeviceIn == SPISlaveDeviceEnum.SPI_SLAVEDEVICE_CS1)
{
deviceFileName = deviceFileName.Replace("%slave%", "1");
}
else
{
// should never happen
throw new Exception("Unknown SPI Slave Device:" + spiSlaveDeviceIn.ToString());
}
// we open the file. We have to have an open file descriptor
// note this is an external call. It has to be because the
// ioctl needs an open file descriptor it can use
int fd = ExternalFileOpen(deviceFileName, O_RDWR | O_NONBLOCK);
if (fd <= 0)
{
throw new Exception("Could not open spidev file:" + deviceFileName);
}
//Console.WriteLine("SPIPort Slave Device Enabled: "+ deviceFileName);
// create a new slave device handle
SPISlaveDeviceHandle outHandle = new SPISlaveDeviceHandle(spiSlaveDeviceIn, fd);
// record that we opened this slave device (so we can close it later)
openSlaveDevices.Add(outHandle);
// return the slave device handle
return(outHandle);
}
/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Resets the object to the default state
/// </summary>
/// <history>
/// 01 Dec 16 Cynic - Originally written
/// </history>
public void Reset()
{
spiSlaveDevice = SPISlaveDeviceEnum.SPI_SLAVEDEVICE_NONE;
spiDevFileDescriptor = -1;
GpioSlaveSelect = null;
speedInHz = 0;
delay_usecs = 0;
bits_per_word = 0;
cs_change = 0;
}
/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Constructor
/// </summary>
/// <param name="spiSlaveDeviceIn">The SPI slave device</param>
/// <param name="spiDevFileDescriptor">The SPI file descriptor</param>
/// <history>
/// 01 Dec 16 Cynic - Originally written
/// </history>
public SPISlaveDeviceHandle(SPISlaveDeviceEnum spiSlaveDeviceIn, int spiDevFileDescriptorIn)
{
spiSlaveDevice = spiSlaveDeviceIn;
spiDevFileDescriptor = spiDevFileDescriptorIn;
}
/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Constructor
/// </summary>
/// <param name="spiSlaveDeviceIn">The SPI slave device</param>
/// <param name="gpioSlaveSelectIn">The GPIO output port acting as the slave select line</param>
/// <history>
/// 01 Dec 16 Cynic - Originally written
/// </history>
public SPISlaveDeviceHandle(SPISlaveDeviceEnum spiSlaveDeviceIn, OutputPortMM gpioSlaveSelectIn)
{
spiSlaveDevice = spiSlaveDeviceIn;
gpioSlaveSelect = gpioSlaveSelectIn;
}
