/// <summary>
/// Create a FT4222 I2C Device
/// </summary>
/// <param name="settings">I2C Connection Settings</param>
/// <param name="frequencyKbps">The speed of I2C transmission.</param>
public Ft4222I2cEx(I2cConnectionSettings settings, uint frequencyKbps = I2cMasterFrequencyKbps)
{
_settings = settings ?? throw new ArgumentNullException(nameof(settings));
FrequencyKbps = frequencyKbps;
// Check device
var devInfos = FtCommon.GetDevices();
if (devInfos.Count == 0)
{
throw new IOException("No FTDI device available");
}
// Select the one from bus Id
// FT4222 propose depending on the mode multiple interfaces. Only the A is available for I2C or where there is none as it's the only interface
var devInfo = devInfos.Where(m => m.Description == "FT4222 A" || m.Description == "FT4222").ToArray();
if ((devInfo.Length == 0) || (devInfo.Length < _settings.BusId))
{
throw new IOException($"Can't find a device to open I2C on index {_settings.BusId}");
}
DeviceInformation = devInfo[_settings.BusId];
// Open device
var ftStatus = FtFunction.FT_OpenEx(DeviceInformation.LocId, FtOpenType.OpenByLocation, out _ftHandle);
if (ftStatus != FtStatus.Ok)
{
throw new IOException($"Failed to open device {DeviceInformation.Description}, status: {ftStatus}");
}
// Set the clock
FtClockRate ft4222Clock = FtClockRate.Clock24MHz;
ftStatus = FtFunction.FT4222_SetClock(_ftHandle, ft4222Clock);
if (ftStatus != FtStatus.Ok)
{
throw new IOException($"Failed set clock rate {ft4222Clock} on device: {DeviceInformation.Description}, status: {ftStatus}");
}
// Set the device as I2C Master
ftStatus = FtFunction.FT4222_I2CMaster_Init(_ftHandle, frequencyKbps);
if (ftStatus != FtStatus.Ok)
{
throw new IOException($"Failed to initialize I2C Master mode on device: {DeviceInformation.Description}, status: {ftStatus}");
}
}
/// <summary>
/// Create a FT4222 I2C Device
/// </summary>
/// <param name="deviceInformation">Device information. Use FtCommon.GetDevices to get it.</param>
public Ft4222I2cBus(FtDevice deviceInformation)
{
switch (deviceInformation.Type)
{
case FtDeviceType.Ft4222HMode0or2With2Interfaces:
case FtDeviceType.Ft4222HMode1or2With4Interfaces:
case FtDeviceType.Ft4222HMode3With1Interface:
break;
default: throw new ArgumentException($"Unknown device type: {deviceInformation.Type}");
}
DeviceInformation = deviceInformation;
// Open device
var ftStatus = FtFunction.FT_OpenEx(DeviceInformation.LocId, FtOpenType.OpenByLocation, out _ftHandle);
if (ftStatus != FtStatus.Ok)
{
throw new IOException($"Failed to open device {DeviceInformation.Description}, status: {ftStatus}");
}
// Set the clock
FtClockRate ft4222Clock = FtClockRate.Clock24MHz;
ftStatus = FtFunction.FT4222_SetClock(_ftHandle, ft4222Clock);
if (ftStatus != FtStatus.Ok)
{
throw new IOException($"Failed set clock rate {ft4222Clock} on device: {DeviceInformation.Description}, status: {ftStatus}");
}
// Set the device as I2C Master
ftStatus = FtFunction.FT4222_I2CMaster_Init(_ftHandle, I2cMasterFrequencyKbps);
if (ftStatus != FtStatus.Ok)
{
throw new IOException($"Failed to initialize I2C Master mode on device: {DeviceInformation.Description}, status: {ftStatus}");
}
}
