protected Task <double> ReadTemp(byte command)
{
return(Task.Run(() =>
{
var result = Device.Write(Address, new byte[] { command }, 1, out int transferred, FtI2CTransferOptions.I2C_TRANSFER_OPTIONS_START_BIT);
if (!Device.Ok(result))
{
throw new TempSensorException("Could not setup Ta read");
}
var taData = new byte[3];
result = Device.Read(Address, taData, taData.Length, out transferred, FtI2CTransferOptions.I2C_TRANSFER_OPTIONS_STOP_BIT | FtI2CTransferOptions.I2C_TRANSFER_OPTIONS_START_BIT);
if (!Device.Ok(result))
{
throw new TempSensorException("Could not setup Ta read");
}
var crc = PEC.Calculate(Address, command, taData[0], taData[1]);
//if (crc != taData[2])
// Console.WriteLine("PEC doesn't match");
Console.WriteLine($"{command}: {taData[0]},{taData[1]}");
return ((taData[1] << 8) | taData[0]) * 0.02;
}));
}
public Task SetAddress(byte address)
{
// Sequence for writing a value:
// 1. Power up device
// 2. Write 0x0000 into the cell of interest
// 3. Wait at least 5ms
// 4. Write the new value
// 5. Wait at least 5ms
// 6. Read back and compare if the write was successful
// 7. Power down (to make sure the changes take place at next power up
var defaults = FtI2CTransferOptions.I2C_TRANSFER_OPTIONS_START_BIT;
return(Task.Run(async() =>
{
byte eepromLocation = (byte)(0x20 | RegisterAddress.SmbusAddress);
var pec = PEC.Calculate(0, eepromLocation, 0, 0);
var data = new byte[] { eepromLocation, 0, 0, pec };
var result = Device.Write(0, data, data.Length, out int transfered, defaults | FtI2CTransferOptions.I2C_TRANSFER_OPTIONS_STOP_BIT);
if (result != FtdiMpsseI2CResult.Ok)
{
throw new TempSensorException("Could not write 0 into bus address");
}
await Task.Delay(12);
pec = PEC.Calculate(0, eepromLocation, address, 0);
data = new byte[] { eepromLocation, address, 0, pec };
result = Device.Write(0, data, data.Length, out transfered, defaults | FtI2CTransferOptions.I2C_TRANSFER_OPTIONS_STOP_BIT);
if (!Device.Ok(result))
{
throw new TempSensorException("Could not set new address");
}
await Task.Delay(12);
var readData = new byte[3];
data = new byte[] { eepromLocation };
result = Device.Write(0, data, data.Length, out transfered, defaults);
result = Device.Read(0, readData, 3, out transfered, defaults | FtI2CTransferOptions.I2C_TRANSFER_OPTIONS_STOP_BIT);
if (!Device.Ok(result))
{
throw new TempSensorException("Could not read I2C address");
}
if (readData[0] != address)
{
throw new TempSensorException("Temperature sensor address was not set successfully");
}
Address = address;
}));
}
