/// <summary>
/// Read from sensor's Main Register
/// </summary>
/// <param name="location">Location to read (sensor data starts at 128)</param>
/// <param name="nBytes">Number of bytes to read (max = 32)</param>
/// <param name="i2CAddress">I2C Address</param>
/// <returns>4 byte timestamp followed by nBytes of data</returns>
public byte[] ReadFromMainRegister(byte location, byte nBytes, byte i2CAddress)
{
if (nBytes > 32)
{
MessageBox.Show("Error - Trying to read too much");
return(null);
}
if (location + nBytes > 191) //0 - 191 are valid memory locations
{
MessageBox.Show("Error - Trying to read off the end of the main register");
return(null);
}
byte[] cmdToArduino = SerialCommand.GenerateReadCommand(i2CAddress, cmdItr_++, location, nBytes);
try
{
serialPort_.Write(cmdToArduino, 0, cmdToArduino.Length);
}
catch (Exception) // USB has been unplugged
{
return(null);
}
bool acknowledged = false;
long attempts = 50;
Thread.Sleep(10); //Give comms time to happen
while (false == acknowledged && attempts > 0)
{
byte[] cmdFromArduino = ProcessSerialBuffer();
if (null != cmdFromArduino)
{
if (cmdToArduino[I2C_ID_BYTE] == cmdFromArduino[I2C_ID_BYTE])
{
acknowledged = true;
byte[] toReturn = new byte[nBytes + TIMESTAMP_SIZE];
Array.Copy(cmdFromArduino, I2C_TIMESTAMP, toReturn, 0, TIMESTAMP_SIZE);
Array.Copy(cmdFromArduino, I2C_START_OF_DATA, toReturn, TIMESTAMP_SIZE, nBytes);
return(toReturn);
}
else
{
MessageBox.Show("Comms error - failed ack");
acknowledged = true; //Move on anyway
return(null);
}
}
else
{
Thread.Sleep(10);
attempts--;
}
}
return(null); // no ack
}
/// <summary>
/// Write to sensor's Calibration Register
/// </summary>
/// <param name="toSend">Data to write (max 28 bytes)</param>
/// <param name="location">Main register location (can write upto byte 128)</param>
/// <param name="i2CAddress">I2C Address</param>
/// <returns>Was successful?</returns>
public bool WriteToCalibrationRegister(byte[] toSend, byte location, byte i2CAddress)
{
if (toSend.Length > 28) //Max write length (limited by 32 byte i2c transfer length = 28 bytes of data + header info)
{
MessageBox.Show("Trying to write a packet that is too large", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
return(false);
}
if (toSend.Length + location > 1024)
{
MessageBox.Show("Trying to write into read only region", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
return(false);
}
byte[] cmdToArduino = SerialCommand.GenerateWriteCalCommand(i2CAddress, cmdItr_++, location, toSend);
serialPort_.Write(cmdToArduino, 0, cmdToArduino.Length);
bool acknowledged = false;
int attempts = 20;
//Typically takes 4 - 6 attempts as the chip needs to
//write the settings to flash which takes about 50ms.
Thread.Sleep(10); //Give comms time to happen
while (false == acknowledged && attempts > 0)
{
byte[] cmdFromArduino = ProcessSerialBuffer();
if (null != cmdFromArduino)
{
if (cmdToArduino[I2C_ID_BYTE] == cmdFromArduino[I2C_ID_BYTE])
{
acknowledged = true;
return(true);
}
else
{
MessageBox.Show("Comms Error - Failed Acknoledge Write Command", "Communications Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
acknowledged = true; //Move on anyway
return(false);
}
}
else
{
Thread.Sleep(10); //Keep waiting
attempts--;
}
}
return(false); // no ack, give up
}
/// <summary>
/// Write to Toggle the PIN
/// </summary>
/// <param name="toSend">Pins to Toggle</param>
/// <returns>Was successful?</returns>
public bool WriteToggleCommand(byte toSend)
{
byte[] cmdToArduino = SerialCommand.GenerateToggleCommand(4, cmdItr_++, 0, toSend);
serialPort_.Write(cmdToArduino, 0, cmdToArduino.Length);
bool acknowledged = false;
long attempts = 50;
Thread.Sleep(10); //Give comms time to happen
while (false == acknowledged && attempts > 0)
{
byte[] cmdFromArduino = ProcessSerialBuffer();
if (null != cmdFromArduino)
{
if (cmdToArduino[I2C_ID_BYTE] == cmdFromArduino[I2C_ID_BYTE])
{
acknowledged = true;
return(true);
}
else
{
MessageBox.Show("Comms Error - Failed Acknoledge Write Command", "Communications Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
acknowledged = true; //Move on anyway
return(false);
}
}
else
{
Thread.Sleep(10); //Keep waiting
attempts--;
}
}
return(false); // no ack, give up
}
