// method to connect to any open serial ports and attempt handshake.
// On success, method exits and logs successful baud rate and port name
public Boolean connect()
{
if (serialPort.IsOpen)
{
return true;
}
else
{
// set properties that we know will be always true
serialPort.Parity = Parity.None;
serialPort.DataBits = 8;
serialPort.StopBits = StopBits.One;
serialPort.Handshake = Handshake.None;
serialPort.ReceivedBytesThreshold = 3;
serialPort.ReadTimeout = 500;
string[] AvailableSerialPorts = null; // clear out
// Populate the list box with currently available COM ports
AvailableSerialPorts = SerialPort.GetPortNames();
foreach (string s in AvailableSerialPorts) // put each available port in as an item
{
foreach (int i in baudValues)
{
try
{
serialPort.PortName = s;
serialPort.BaudRate = i;
serialPort.Open(); // open serial port on a COM and a baud from the baud values array
txPacket = new TxPacket(TxPacket.INSTRUCTION_HANDSHAKE, TxPacket.DATA1_HANDSHAKE, TxPacket.DATA2_HANDSHAKE);
// send the packet as an array of bytes
serialPort.DiscardOutBuffer();
serialPort.DiscardInBuffer();
serialPort.Write(txPacket.asByteArray(), 0, 3);
rxPacket = new RxPacket(); // make a new incoming packet to store data in.
while ((serialPort.BytesToRead < 3) && (serialTimeoutCounter < connectTimeout))
{
Thread.Sleep(1);
serialTimeoutCounter++;
}
serialTimeoutCounter = 0;
if (dataStorage.getVerbosity())
{
form1.appendToRichTextBox1("Attempting connection on " + serialPort.PortName
+ " " + serialPort.BaudRate + " baud\r");
}
if (serialPort.BytesToRead >= 3)
{
rxPacket.setInstruction((Byte)serialPort.ReadByte());
rxPacket.setData1((Byte)serialPort.ReadByte());
rxPacket.setData2((Byte)serialPort.ReadByte());
if ((rxPacket.getInstruction() == RxPacket.RX_INSTRUCTION_HANDSHAKE) && (rxPacket.getData2() == RxPacket.RX_DATA2_HANDSHAKE))
{
incomingPackets.Enqueue(rxPacket); // put the handshake response packet in the incoming packets queue.
parseData(incomingPackets);
// parseData(rxPacket);
serialPort.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler); // start the handler for future packets.
form1.appendToRichTextBox1("Connected to device on port " + s + " at " + i + " baud.\r");
}
else
{
if (dataStorage.getVerbosity())
{
form1.appendToRichTextBox1("An MCU at " + serialPort.PortName + ", " + serialPort.BaudRate +
" baud replied with " + rxPacket.getInstruction().ToString("x") + " " +
rxPacket.getData1().ToString("x") + " " + rxPacket.getData2().ToString("x") + "\r");
}
serialPort.DiscardInBuffer();
serialPort.DiscardOutBuffer();
serialPort.Close();
}
}
else
{
serialPort.DiscardInBuffer();
serialPort.DiscardOutBuffer();
serialPort.Close();
if (dataStorage.getVerbosity())
{
form1.appendToRichTextBox1("Failed to connect to " + serialPort.PortName + " at "
+ serialPort.BaudRate + " baud rate.\r");
}
}
}
catch (Exception ex)
{
serialPort.DiscardInBuffer();
serialPort.DiscardOutBuffer();
serialPort.Close();
form1.appendToRichTextBox1("Error connecting to port " + serialPort.PortName + " at "
+ serialPort.BaudRate + " baud, message: " + ex.Message + "\r");
}
if (serialPort.IsOpen)
{
return true;
}
}
if (serialPort.IsOpen)
{
return true;
}
}
}
return false;
}
// parses the data received in the packet into appropriate memory locations
private void parseData(Queue<RxPacket> incomingPackets/*RxPacket rxPacket*/)
{
while (incomingPackets.Count > 0)
{
rxPacket = incomingPackets.Dequeue();
switch (rxPacket.getInstruction())
{
case RxPacket.RX_INSTRUCTION_HANDSHAKE:
int numChannels = rxPacket.getData1();
if (numChannels < 8)
{
form1.appendToRichTextBox1("MCU has " + numChannels + " channels.\r");
}
if (numChannels > 8)
{
numChannels = 8;
form1.appendToRichTextBox1("MCU has more than 8 channels.\rUsing channels 0-7\r");
}
dataStorage.setNumADCChannels(numChannels);
form1.appendToRichTextBox1("received handshake packet from MCU.\r");
break;
case RxPacket.RX_INSTRUCTION_READ_ADC_CHANNEL_ZERO:
case RxPacket.RX_INSTRUCTION_READ_ADC_CHANNEL_ONE:
case RxPacket.RX_INSTRUCTION_READ_ADC_CHANNEL_TWO:
case RxPacket.RX_INSTRUCTION_READ_ADC_CHANNEL_THREE:
case RxPacket.RX_INSTRUCTION_READ_ADC_CHANNEL_FOUR:
case RxPacket.RX_INSTRUCTION_READ_ADC_CHANNEL_FIVE:
case RxPacket.RX_INSTRUCTION_READ_ADC_CHANNEL_SIX:
case RxPacket.RX_INSTRUCTION_READ_ADC_CHANNEL_SEVEN:
case RxPacket.RX_INSTRUCTION_READ_ADC_CHANNEL_EIGHT:
case RxPacket.RX_INSTRUCTION_READ_ADC_CHANNEL_NINE:
case RxPacket.RX_INSTRUCTION_READ_ADC_CHANNEL_TEN:
case RxPacket.RX_INSTRUCTION_READ_ADC_CHANNEL_ELEVEN:
UInt16 ADCcount = (UInt16)((UInt16)rxPacket.getData1() << 8);
ADCcount |= (UInt16)rxPacket.getData2();
dataStorage.setADCCount(rxPacket.getInstruction(), ADCcount); // packet instruction is ADC channel to measure
if (dataStorage.getVerbosity())
{
form1.appendToRichTextBox1("Read ADC channel " + rxPacket.getInstruction() + " value is 0x"
+ ADCcount.ToString("x") + "\r");
}
break;
case RxPacket.RX_INSTRUCTION_FAILED_ADC_READ:
form1.appendToRichTextBox1("MCU failed to read ADC\r");
break;
case RxPacket.RX_INSTRUCTION_READ_DUTY_CYCLE:
dataStorage.setCurrentDutyCycle(rxPacket.getData1()); // record duty cycle
if (dataStorage.getVerbosity())
{
form1.appendToRichTextBox1("Duty cycle is 0x" + rxPacket.getData1().ToString("x") + "\r");
}
break;
case RxPacket.RX_INSTRUCTION_SET_DUTY_CYCLE:
dataStorage.setCurrentDutyCycle(rxPacket.getData2()); // record duty cycle
if (dataStorage.getVerbosity())
{
form1.appendToRichTextBox1("Duty cycle changed from 0x" + rxPacket.getData1().ToString("x") + " to 0x"
+ rxPacket.getData2().ToString("x") + "\r");
}
break;
case RxPacket.RX_INSTRUCTION_EOF:
break;
case RxPacket.RX_INSTRUCTION_UNKNOWN_COMMAND:
form1.appendToRichTextBox1("MCU sent error code 0xAA, says it received instruction 0x"
+ rxPacket.getData1().ToString("x") + " and data1 0x" + rxPacket.getData2().ToString("x") + "\r");
break;
default:
form1.appendToRichTextBox1("Error reading fom MCU: \r received instruction code 0x"
+ rxPacket.getInstruction().ToString("x") + "\r data 1 was 0x" + rxPacket.getData1().ToString("x")
+ "\r data 2 was 0x" + rxPacket.getData2().ToString("x") + "\r");
//throw new Exception("Error parsing data from MCU");
break;
}
}
}