void NewDataCallback()
{
lock (this) // Prevent concurrent execution
{
bool newData = false;
bool badData;
while (BaseDevice.BufferedByteCountPipe(IN_PIPE) >= 5)
{
badData = false;
byte[] data = BaseDevice.BufferedPeekPipe(IN_PIPE, 5);
if (data[0] != 0xFF)
{
badData = true;
}
for (int i = 0; i < 4; i++)
{
if (data[i + 1] >= 0x80)
{
// This is also a bad data (truncated) message, this can happen if the host falls behind.
badData = true;
break;
}
}
if (badData)
{
// Bad data. Try again next byte.
BaseDevice.BufferedSkipBytesPipe(IN_PIPE, 1);
continue;
}
// This looks like a button message
for (int i = 0; i < 4; i++)
{
ButtonValues[i] = data[i + 1];
ButtonPressed[i] = ButtonValues[i] < ButtonThreshold;
}
newData = true;
DataCount++;
BaseDevice.BufferedSkipBytesPipe(IN_PIPE, 5);
}
if (newData)
{
// Provide notification.
}
}
}
