void create_err(string msg)
{
rxIndex = 0;
CommState = ReceiverStates.WaitingStart;
timerEnabled = false;
Console.WriteLine(msg);
}
/// <summary>
/// Tasks to perform when user stop playing
/// </summary>
private void EndReceiveTasks()
{
startButton.Text = "Start receiving";
startButton.Enabled = true;
stopButton.Enabled = false;
ReceiverState = ReceiverStates.Stopped;
}
private void StartReceiving()
{
#region guard
if (ReceiverState != ReceiverStates.Stopped)
{
return;
}
#endregion
// Reset all
InitReceiveTasks();
ReceiverState = ReceiverStates.Receiving;
timerReceiver.Start();
try
{
inDevice.StartRecording();
}
catch (Exception ex)
{
ReceiverState = ReceiverStates.Stopped;
MessageBox.Show(ex.Message, "Error!", MessageBoxButtons.OK, MessageBoxIcon.Stop);
}
}
public frmExternalMidiPlay(InputDevice inputdevice, OutputDevice outputdevice)
{
InitializeComponent();
stopButton.Enabled = false;
startButton.Enabled = true;
outDevice = outputdevice;
inDevice = inputdevice;
context = SynchronizationContext.Current;
// Input Midi device
if (!InitInputDevice())
{
startButton.Enabled = false;
stopButton.Enabled = false;
}
// Init patch & Channel of Output device
InitOutputDevice();
InitlstInstruments();
ReceiverState = ReceiverStates.Stopped;
timerReceiver.Interval = 100;
}
private void StopReceiving()
{
#region guard
if (ReceiverState != ReceiverStates.Receiving)
{
return;
}
#endregion
try
{
inDevice.StopRecording();
inDevice.Reset();
// tells timer receiver to stop all
ReceiverState = ReceiverStates.Stopping;
}
catch (Exception ex)
{
ReceiverState = ReceiverStates.Stopped;
MessageBox.Show(ex.Message, "Error!", MessageBoxButtons.OK, MessageBoxIcon.Stop);
}
}
void packetFormerCheck()
{
if (CommState == ReceiverStates.WaitingStart)
{
//ждем новый пакет
//статус может изменить таймер таймаута
if (rxIndex == 0)
{
return;
}
if (rxIndex > 0 && rxBuf[0] != Utils.PACKET_START)
{
rxIndex = 0;
create_err("Неправильный стартовый пакет");
return;
}
else
{
CommState = ReceiverStates.ReceivingSize;
rxPackSize = 0;
timerEnabled = true;
timerCounter = 0;
}
}
if (CommState == ReceiverStates.ReceivingSize)
{
if (rxIndex > 3)
{
int inPacksize = rxBuf[1] | rxBuf[2] << 8;
if (inPacksize < EMPTY_SIZE)
{
create_err("Слишком маленький пакет");
return;
}
if (inPacksize > MAX_BUF_SIZE_RX - EMPTY_SIZE)
{
create_err("Входящий пакет с слишком большим размером");
return;
}
rxPackSize = inPacksize;
CommState = ReceiverStates.ReceivingPacket;
}
else
{
return;
}
}
if (CommState == ReceiverStates.ReceivingPacket)
{
if (rxIndex >= rxPackSize)
{
//Пакет пришел. останавливаем таймер и проверяем его
timerEnabled = false;
CommState = ReceiverStates.Processing;
}
}
if (CommState == ReceiverStates.ReceivingTimeout)
{
create_err("Таймаут получения пакета");
}
if (CommState == ReceiverStates.Processing)
{
//останавливаем таймер таймаута так как пришел весь пакет
timerEnabled = false;
//check CRC
byte crc = 0;
//265-2=263
for (int i = 0; i < rxPackSize - 2; i++)
{
crc += rxBuf[i];
}
byte crcXOR = (byte)(crc ^ (byte)0xAA);
//если контрольная сумма сошлась
if (crc == rxBuf[rxPackSize - 2] &&
crcXOR == rxBuf[rxPackSize - 1])
{
enqeueIncomingPacket();
rxIndex = 0;
CommState = ReceiverStates.WaitingStart;
}
else
{//crc error
create_err("Ошибка CRC");
return;
}
}
}
