private async Task Update()
{
byte[] readBuffer;
BitArray bufferBits;
//Send the command to the sensor to tell it to do the thing.
i2cPeripheral.WriteBytes(mprlsMeasurementCommand);
//Datasheet says wait 5 ms.
await Task.Delay(5);
while (true)
{
readBuffer = i2cPeripheral.ReadBytes(1);
bufferBits = new BitArray(readBuffer);
//From section 6.5 of the datasheet.
this.IsDevicePowered = bufferBits[6];
this.IsDeviceBusy = bufferBits[5];
this.HasMemoryIntegrityFailed = bufferBits[2];
this.InternalMathSaturated = bufferBits[0];
if (this.InternalMathSaturated)
{
throw new InvalidOperationException("Sensor pressure has exceeded max value!");
}
if (this.HasMemoryIntegrityFailed)
{
throw new InvalidOperationException("Sensor internal memory integrity check failed!");
}
if (!(this.IsDeviceBusy))
{
break;
}
}
readBuffer = i2cPeripheral.ReadBytes(4);
RawPSIMeasurement = (readBuffer[1] << 16) | (readBuffer[2] << 8) | readBuffer[3];
//Console.WriteLine(RawPSIMeasurement);
//From Section 8.0 of the datasheet.
CalculatedPSIMeasurement = (RawPSIMeasurement - 1677722) * (psiMax - psiMin);
//Console.WriteLine(CalculatedPSIMeasurement);
CalculatedPSIMeasurement /= 15099494 - 1677722;
//Console.WriteLine(CalculatedPSIMeasurement);
CalculatedPSIMeasurement += psiMin;
//Console.WriteLine(CalculatedPSIMeasurement);
//https://www.justintools.com/unit-conversion/pressure.php?k1=psi&k2=millibars
CalculatedhPAMeasurement = CalculatedPSIMeasurement * 68.947572932;
//Console.WriteLine(CalculatedhPAMeasurement);
Conditions.Pressure = CalculatedPSIMeasurement;
}
public byte[] Read(int expectedByteCount, out UInt16 ResultCode)
{
//Read the IOT-SAS reply
var data = new byte[expectedByteCount];
var resultCode = new byte[2];
var count = 0;
#if DEBUGSERIAL
Console.WriteLine($"RX: Start RX {expectedByteCount}");
#endif
try
{
while (count < expectedByteCount)
{
var datain = sas.ReadBytes((ushort)(expectedByteCount - count));
Array.Copy(datain, 0, data, count, datain.Length);
#if DEBUGSERIAL
Console.WriteLine($"RX: {BitConverter.ToString(datain)}");
#endif
count += datain.Length;
}
//count = 0;
//expectedByteCount = 2;
//while (count < 2)
//{
resultCode = sas.ReadBytes((ushort)(1));
// }
Array.Reverse(resultCode);
ResultCode = BitConverter.ToUInt16(resultCode, 0);
}
catch (TimeoutException)
{
if (count == 2)
{
Array.Reverse(data, 0, 2);
ResultCode = BitConverter.ToUInt16(data, 0);
throw new SASException(ResultCode, "Serial port - Timeout, no data");
}
else
{
throw new SASException(eResultCode.PORT_NO_DATA, "Serial port - Timeout, no data");
}
}
resultCode = sas.ReadBytes(2);
Array.Reverse(resultCode);
ResultCode = BitConverter.ToUInt16(resultCode, 0);
#if DEBUGSERIAL
Console.WriteLine($"RXE: {BitConverter.ToString(resultCode,0,2)} ResultCode: {resultCode.ToHexString()}");
#endif
return(data);
}
/// <summary>
/// Force the sensor to make a reading and update the relevant properties.
/// </summary>
public async Task Update()
{
hih6130.WriteByte(0);
//
// Sensor takes 35ms to make a valid reading.
//
await Task.Delay(40);
var data = hih6130.ReadBytes(4);
//
// Data format:
//
// Byte 0: S1 S0 H13 H12 H11 H10 H9 H8
// Byte 1: H7 H6 H5 H4 H3 H2 H1 H0
// Byte 2: T13 T12 T11 T10 T9 T8 T7 T6
// Byte 4: T5 T4 T3 T2 T1 T0 XX XX
//
if ((data[0] & 0xc0) != 0)
{
throw new Exception("Status indicates readings are invalid.");
}
var reading = ((data[0] << 8) | data[1]) & 0x3fff;
Conditions.Humidity = ((float)reading / 16383) * 100;
reading = ((data[2] << 8) | data[3]) >> 2;
Conditions.Temperature = (((float)reading / 16383) * 165) - 40;
}
protected async Task <AtmosphericConditions> ReadSensor()
{
AtmosphericConditions conditions = new AtmosphericConditions();
return(await Task.Run(() => {
si7021.WriteByte(HUMDITY_MEASURE_NOHOLD);
//
// Maximum conversion time is 12ms (page 5 of the datasheet).
//
Thread.Sleep(25);
var data = si7021.ReadBytes(3);
var humidityReading = (ushort)((data[0] << 8) + data[1]);
conditions.Humidity = ((125 * (float)humidityReading) / 65536) - 6;
if (conditions.Humidity < 0)
{
conditions.Humidity = 0;
}
else
{
if (conditions.Humidity > 100)
{
conditions.Humidity = 100;
}
}
data = si7021.ReadRegisters(TEMPERATURE_MEASURE_PREVIOUS, 2);
var temperatureReading = (short)((data[0] << 8) + data[1]);
conditions.Temperature = (float)(((175.72 * temperatureReading) / 65536) - 46.85);
return conditions;
}));
}
/// <summary>
/// Get ASG01DB VOC Gas Concentration
/// </summary>
/// <returns>Concentration (ppm)</returns>
public double GetConcentration()
{
var data = new byte[] { ASG_DATA_MSB, ASG_DATA_LSB };
sensor.WriteBytes(data);
var readBuffer = sensor.ReadBytes(3);
// CRC check
// if (!CheckCrc8(readBuffer, 2, readBuffer[1]))
// {
// return -1;
// }
ushort res = BinaryPrimitives.ReadUInt16BigEndian(readBuffer.AsSpan(0, 2));
return(res / 10.0);
}
/// <summary>
/// Force the sensor to make a reading and update the relevanyt properties.
/// </summary>
/// <param name="startAddress">Start address for the read operation.</param>
/// <param name="amount">Amount of data to read from the EEPROM.</param>
public byte[] Read(ushort startAddress, ushort amount)
{
CheckAddress(startAddress, amount);
var address = new byte[2];
address[0] = (byte)((startAddress >> 8) & 0xff);
address[1] = (byte)(startAddress & 0xff);
_eeprom.WriteBytes(address);
return(_eeprom.ReadBytes(amount));
}
/// <summary>
/// Read data via I2C (DHT12, etc.)
/// </summary>
internal virtual void ReadDataI2c()
{
_sensor.WriteByte(0x00);
_readBuffer = _sensor.ReadBytes(5);
_lastMeasurement = Environment.TickCount;
if ((_readBuffer[4] == ((_readBuffer[0] + _readBuffer[1] + _readBuffer[2] + _readBuffer[3]) & 0xFF)))
{
WasLastReadSuccessful = (_readBuffer[0] != 0) || (_readBuffer[2] != 0);
}
else
{
WasLastReadSuccessful = false;
}
}
private long ReadUncompensatedTemperature()
{
// write register address
bmp085.WriteBytes(new byte[] { 0xF4, 0x2E });
// Required as per datasheet.
Thread.Sleep(5);
// write register address
bmp085.WriteBytes(new byte[] { 0xF6 });
// get MSB and LSB result
byte[] data = new byte[2];
data = bmp085.ReadBytes(2);
return((data[0] << 8) | data[1]);
}
void ReadStatus()
{
reception_data = i2cPeripheral.ReadBytes(5);
Thread.Sleep(100);
}