/// <summary>
/// Connects to the FTDI device.
/// </summary>
/// <param name="serialNumber">A FTDI device serial number.</param>
/// <param name="deviceChannelIndex">A channel index in the device.</param>
public virtual Task Connect(string serialNumber, int deviceChannelIndex)
{
return(Task.Run(() =>
{
FTDI.FT_STATUS status;
NativeMethods.Init_libMPSSE();
// Find requested channel
uint channelCount;
status = NativeMethods_I2C.I2C_GetNumChannels(out channelCount);
if (status != FTDI.FT_STATUS.FT_OK)
{
throw new CommunicationException("Unable to find number of I2C channels. (Status: " + status + ")");
}
uint channelIndex;
var deviceNode = new NativeMethods.FT_DEVICE_LIST_INFO_NODE();
var tmpChannelIndex = deviceChannelIndex;
for (channelIndex = 0; channelIndex < channelCount; channelIndex++)
{
status = NativeMethods_I2C.I2C_GetChannelInfo(0, deviceNode);
if (status != FTDI.FT_STATUS.FT_OK)
{
throw new CommunicationException("Unable to get information about channel " + channelIndex + ". (Status: " + status + ")");
}
if (deviceNode.SerialNumber == serialNumber)
{
if (tmpChannelIndex > 0)
{
tmpChannelIndex--;
}
else
{
break;
}
}
}
if (channelIndex >= channelCount)
{
throw new CommunicationException("Unable to find channel " + deviceChannelIndex + " on device with serial number '" + serialNumber + "'.");
}
this.DeviceNode = deviceNode;
// Open channel
IntPtr handle;
status = NativeMethods_I2C.I2C_OpenChannel(channelIndex, out handle);
if (status != FTDI.FT_STATUS.FT_OK)
{
throw new CommunicationException("Unable to open I2C channel. (Status: " + status + ")");
}
this.ChannelHandle = handle;
// Configure channel
// NativeMethods.ClockRate.Standard
var config = new NativeMethods_I2C.ChannelConfig((NativeMethods_I2C.ClockRate) 10000, 1, NativeMethods_I2C.ConfigOptions.I2C_ENABLE_DRIVE_ONLY_ZERO);
status = NativeMethods_I2C.I2C_InitChannel(this.ChannelHandle, config);
if (status != FTDI.FT_STATUS.FT_OK)
{
throw new CommunicationException("Unable to initialize I2C channel. (Status: " + status + ")");
}
}));
}
