//-------------------------------------------------------------------------------------------------------------------------------------------
private void SendResponse(byte command_byte, byte[] buffer)
{
byte[] response = new byte[] { (byte)(command_byte + 0x10), buffer[1], buffer[2] };
Debug.Print("Sending response: ");
NumberConversions.PrintByteArray(response);
_port.Write(response, 0, response.Length);
}
//-------------------------------------------------------------------------------------------------------------------------------------------
private void SendResponse(byte command_byte, byte[] buffer, ushort value)
{
char[] value_array = NumberConversions.ShortToCharArray(value);
byte[] response = new byte[] { (byte)(command_byte + 0x10), buffer[1], buffer[2], (byte)value_array[0], (byte)value_array[1], (byte)value_array[2], (byte)value_array[3] };
Debug.Print("Sending response: ");
NumberConversions.PrintByteArray(response);
_port.Write(response, 0, response.Length);
}
//-------------------------------------------------------------------------------------------------------------------------------------------
private byte GetVariableIndexFromBuffer(byte command_byte, byte[] buffer)
{
byte index_high_nibble = buffer[1];
byte index_low_nibble = buffer[2];
byte index = NumberConversions.HexStringToByte(new String(new char[] { (char)index_high_nibble, (char)index_low_nibble }));
Debug.Print("Command 0x" + NumberConversions.ByteToHexString(command_byte) + ": variable index = " + index.ToString());
return(index);
}
//-------------------------------------------------------------------------------------------------------------------------------------------
private byte GetByteValueFromBuffer(byte command_byte, byte[] buffer)
{
byte value_high_nibble = buffer[3];
byte value_low_nibble = buffer[4];
byte value = NumberConversions.HexStringToByte(new String(new char[] { (char)value_high_nibble, (char)value_low_nibble }));
Debug.Print("Command 0x" + NumberConversions.ByteToHexString(command_byte) + ": setting with byte value = " + value.ToString());
return(value);
}
//-------------------------------------------------------------------------------------------------------------------------------------------
/// <summary>
/// Sets the specified byte in the Amulet touchscreen
/// </summary>
/// <param name="index"></param>
/// <returns></returns>
public byte GetByte(byte index)
{
char[] nibbles = NumberConversions.ByteToCharArray(index);
_port.Write(new byte[] { 0xD0, (byte)nibbles[0], (byte)nibbles[1] }, 0, 3);
// set timer to check response time
long start = Microsoft.SPOT.Hardware.Utility.GetMachineTime().Ticks;
// wait for response from Amulet
byte result = ParseResponseForByte();
long end = Microsoft.SPOT.Hardware.Utility.GetMachineTime().Ticks;
long ms = (end - start) / System.TimeSpan.TicksPerMillisecond;
return(result);
}
//-------------------------------------------------------------------------------------------------------------------------------------------
private ushort GetShortValueFromBuffer(byte command_byte, byte[] buffer)
{
byte msb_value_high_nibble = buffer[3];
byte msb_value_low_nibble = buffer[4];
byte msb = NumberConversions.HexStringToByte(new String(new char[] { (char)msb_value_high_nibble, (char)msb_value_low_nibble }));
byte lsb_value_high_nibble = buffer[5];
byte lsb_value_low_nibble = buffer[6];
byte lsb = NumberConversions.HexStringToByte(new String(new char[] { (char)lsb_value_high_nibble, (char)lsb_value_low_nibble }));
ushort value = (ushort)(((short)msb << 8) + (short)lsb);
Debug.Print("Command 0x" + NumberConversions.ByteToHexString(command_byte) + ": setting with short value = " + value.ToString());
return(value);
}
//-------------------------------------------------------------------------------------------------------------------------------------------
private bool ValidateCommandPacket(byte command_byte, byte[] buffer)
{
if (buffer.Length < (int)GetCommandPacketLength(command_byte))
{
Debug.Print("ERROR: Command parsing for command 0x" + NumberConversions.ByteToHexString(command_byte) + " (" + ByteToCommandName(command_byte) + ") was skipped because not enough data was available");
return(false);
}
if (buffer[1] == 0 || buffer[2] == 0)
{
Debug.Print("ERROR: Command parsing for command 0x" + NumberConversions.ByteToHexString(command_byte) + " (" + ByteToCommandName(command_byte) + ") failed because of null byte(s) in variable index");
return(false);
}
Debug.Print("Command " + ByteToCommandName(command_byte) + " validation OK");
return(true);
}
//-------------------------------------------------------------------------------------------------------------------------------------------
private void SendResponse(byte command_byte, byte[] buffer, byte[] value)
{
int value_length = value.Length;
byte[] response = new byte[3 + value_length * 2 + 1]; // need to create extra space since each byte is broken up into high and low nibbles, plus 1 for null terminator
response[0] = (byte)(command_byte + 0x10);
response[1] = buffer[1];
response[2] = buffer[2];
for (int i = 0; i < value_length; i++)
{
char[] element_nibbles = NumberConversions.ByteToCharArray(value[i]);
response[3 + (i * 2)] = (byte)element_nibbles[0];
response[3 + (i * 2) + 1] = (byte)element_nibbles[1];
}
Debug.Print("Sending response: ");
NumberConversions.PrintByteArray(response);
_port.Write(response, 0, response.Length);
}
//-------------------------------------------------------------------------------------------------------------------------------------------
private void SendResponse(byte command_byte, byte[] buffer, string value)
{
// for null termination ---------------------v
int total_response_size = 3 + value.Length + 1;
byte[] response = new byte[total_response_size];
response[0] = (byte)(command_byte + 0x10);
response[1] = buffer[1];
response[2] = buffer[2];
// get the string characters and cast to byte one by one
char[] value_array = value.ToCharArray();
for (int i = 0; i < value.Length; i++)
{
response[3 + i] = (byte)value_array[i];
}
Debug.Print("Sending response: ");
NumberConversions.PrintByteArray(response);
_port.Write(response, 0, response.Length);
}
//-------------------------------------------------------------------------------------------------------------------------------------------
public ushort[] GetWordVariableArray(byte index)
{
bool print_array = false;
// here we will just return a byte array with 128 random values
const int size = 61;
ushort[] value = new ushort[size];
for (int i = 0; i < size; i++)
{
// scale result - SPOT.Math returns Sin * 1000, so shift up by 1000 since LineGraph doesn't seem to do negative numbers?
value[i] = (ushort)(Microsoft.SPOT.Math.Sin(_sin_word_counter++) + 1000);
}
Debug.Print("[AmuletTestClient] GetWordVariableArray " + index + ":");
if (print_array)
{
NumberConversions.PrintWordArray(value);
}
return(value);
}
//-------------------------------------------------------------------------------------------------------------------------------------------
public byte[] GetByteVariableArray(byte index)
{
bool print_array = false;
// here we will just return a byte array with 128 random values
const int size = 111;
byte[] value = new byte[size];
//new Random().NextBytes( value);
for (int i = 0; i < size; i++)
{
// scale result - SPOT.Math returns Sin * 1000, so divide result by 10 and shift up by 100 since LineGraph doesn't seem to do negative numbers?
value[i] = (byte)(Microsoft.SPOT.Math.Sin(_sin_int_counter++) / 10 + 100);
}
Debug.Print("[AmuletTestClient] GetByteVariableArray " + index + ":");
if (print_array)
{
NumberConversions.PrintByteArray(value);
}
return(value);
}
//-------------------------------------------------------------------------------------------------------------------------------------------
/// <summary>
/// Parses the serial data buffer and responds as appropriate. Buffer should start with a valid command byte.
/// </summary>
private void HandleCommand(byte[] buffer)
{
try {
Debug.Print("Command packet contents:");
NumberConversions.PrintByteArray(buffer);
byte command_byte = buffer[0];
if (!ValidateCommandPacket(command_byte, buffer))
{
return;
}
byte index = GetVariableIndexFromBuffer(command_byte, buffer);
if (!CheckForAmuletClient())
{
return;
}
switch (command_byte)
{
case (byte)Commands.GetByte:
{
// acknowledge the command, but need to get data from IAmuletClient
try {
byte value = _client.GetByte(index);
SendResponse(command_byte, buffer, value);
} catch (Exception ex) {
Debug.Print("ERROR: GetByte failed in client call: " + ex.Message);
SendAck();
}
break;
}
case (byte)Commands.GetWord:
{
// acknowledge the command
try {
ushort value = _client.GetWord(index);
SendResponse(command_byte, buffer, value);
} catch (Exception ex) {
Debug.Print("ERROR: GetWord failed in client call: " + ex.Message);
SendAck();
}
break;
}
case (byte)Commands.GetString:
{
try {
string value = _client.GetString(index);
SendResponse(command_byte, buffer, value);
} catch (Exception ex) {
Debug.Print("ERROR: GetString failed in client call: " + ex.Message);
SendAck();
}
break;
}
case (byte)Commands.GetLabel:
{
try {
string value = _client.GetLabel(index);
SendResponse(command_byte, buffer, value);
} catch (Exception ex) {
Debug.Print("ERROR: GetLabel failed in client call: " + ex.Message);
SendAck();
}
break;
}
case (byte)Commands.GetByteVariableArray:
{
try {
byte[] value = _client.GetByteVariableArray(index);
SendResponse(command_byte, buffer, value);
} catch (Exception ex) {
Debug.Print("ERROR: GetLabel failed in client call: " + ex.Message);
SendAck();
}
break;
}
case (byte)Commands.GetWordVariableArray:
{
try {
ushort[] value = _client.GetWordVariableArray(index);
SendResponse(command_byte, buffer, value);
} catch (Exception ex) {
Debug.Print("ERROR: GetLabel failed in client call: " + ex.Message);
SendAck();
}
break;
}
case (byte)Commands.SetByte:
{
byte value = GetByteValueFromBuffer(command_byte, buffer);
// acknowledge the command
try {
_client.SetByte(index, value);
SendResponse(command_byte, buffer, value);
} catch (Exception ex) {
Debug.Print("ERROR: SetByte failed in client call: " + ex.Message);
SendAck();
}
break;
}
case (byte)Commands.SetWord:
{
ushort value = GetShortValueFromBuffer(command_byte, buffer);
// acknowledge the command
try {
_client.SetWord(index, value);
SendResponse(command_byte, buffer, value);
} catch (Exception ex) {
Debug.Print("ERROR: SetByte failed in client call: " + ex.Message);
SendAck();
}
break;
}
case (byte)Commands.SetString:
{
string value = GetStringValueFromBuffer(command_byte, buffer);
// acknowledge the command
try {
_client.SetString(index, value);
SendResponse(command_byte, buffer, value);
} catch (Exception ex) {
Debug.Print("ERROR: SetString failed in client call: " + ex.Message);
SendAck();
}
break;
}
case (byte)Commands.InvokeRpc:
{
// acknowledge the command, but need to call into IAmuletClient
try {
_client.InvokeRpc(index);
SendResponse(command_byte, buffer);
} catch (Exception ex) {
Debug.Print("ERROR: GetByte failed in client call: " + ex.Message);
SendAck();
}
break;
}
}
// now process any remaining commands
// we can pass 0 because we know that anytime a command is processed, the next valid
// command, if any, will end up at index 0
if (CommandPacketAvailable(0))
{
byte[] data = ExtractCommandPacketFromRxBuffer(0);
HandleCommand(data);
}
} catch (Exception ex) {
Debug.Print(ex.Message);
}
}
//-------------------------------------------------------------------------------------------------------------------------------------------
/// <summary>
/// Returns the command packet and shifts remaining data in RX buffer down
/// </summary>
/// <param name="index_of_command_byte"></param>
/// <returns></returns>
private byte[] ExtractCommandPacketFromRxBuffer(int index_of_command_byte)
{
// the following variables are only used for the debug print statement that is going to
// try to help visualize what's in the buffer, and what is getting extracted for command processing, e.g.
// | command bytes here | rest of buffer here
// print all buffer bytes up to index_of_command_byte
// index_of_command_byte: print | before this position
// print all buffer bytes up to index_of_command_byte + command_packet_length
// print | after last command packet byte
// print rest of buffer bytes
// determine the number of bytes that should be in the command packet, based on the command
byte command_id = _rx_buffer[index_of_command_byte];
byte command_packet_length = GetCommandPacketLength(command_id);
Debug.Print("Handling command ID: " + ByteToCommandName(command_id) + ", expected packet length = " + command_packet_length);
#region VISUALIZATION DEBUG MESSAGE
// now print the debug buffer visualization line
string viz = "";
// print all bytes up to command byte position
for (int i = 0; i < index_of_command_byte; i++)
{
viz += NumberConversions.ByteToHexString(_rx_buffer[i]) + " ";
}
viz += "> ";
// print command packet
for (int i = index_of_command_byte; i < index_of_command_byte + command_packet_length; i++)
{
viz += NumberConversions.ByteToHexString(_rx_buffer[i]) + " ";
if (i == index_of_command_byte + command_packet_length - 1)
{
viz += "< ";
}
}
// print remaining bytes in buffer
for (int i = index_of_command_byte + command_packet_length; i < RX_BUFFER_SIZE; i++)
{
if (_rx_buffer[i] == 0)
{
break;
}
viz += NumberConversions.ByteToHexString(_rx_buffer[i]) + " ";
}
Debug.Print(viz);
#endregion
// now create the array for just the packet
byte[] packet = new byte[command_packet_length];
Array.Copy(_rx_buffer, index_of_command_byte, packet, 0, command_packet_length);
//Debug.Print( "copied command packet from buffer into new packet array");
// we need to save the current _rx_buffer_pointer, because that's the ONLY way we know what the new
// _rx_buffer_pointer should be once we shift down the bits.
int old_rx_buffer_pointer = _rx_buffer_pointer;
// modify the rx buffer and shift down the remaining bytes
_rx_buffer_pointer = index_of_command_byte + command_packet_length; // now it points to the element after the command packet we're handling
// the new rx buffer is where the end of the existing data will end up once we shift all of the bytes down
int new_rx_buffer_pointer = old_rx_buffer_pointer - _rx_buffer_pointer;
Debug.Assert(new_rx_buffer_pointer >= 0, "RX buffer pointer problems!");
//Debug.Print( "rx buffer pointer points at: " + _rx_buffer_pointer);
int bytes_remaining_in_buffer = RX_BUFFER_SIZE - _rx_buffer_pointer;
//Debug.Print( bytes_remaining_in_buffer.ToString() + " bytes left in buffer");
// shift down
//Debug.Print( "shifting down bytes");
for (int i = 0; i < bytes_remaining_in_buffer; i++)
{
_rx_buffer[i] = _rx_buffer[_rx_buffer_pointer + i];
}
//Debug.Print( "clearing remaining space");
// clear remaining space (possibly unnecessary)
for (int i = bytes_remaining_in_buffer; i < RX_BUFFER_SIZE; i++)
{
_rx_buffer[i] = 0;
}
//Debug.Print( "Setting new RX buffer pointer to " + new_rx_buffer_pointer);
_rx_buffer_pointer = new_rx_buffer_pointer;
return(packet);
}