// TODO: Try changing type from Int32 to Int16. Two bytes = Int16.
private PixyBlock BytesToBlock(byte[] bytes)
{
PixyBlock block = new PixyBlock();
block.Sync = BytesToInt(bytes[1], bytes[0]);
block.Checksum = BytesToInt(bytes[3], bytes[2]);
block.Signature = OrBytes(bytes[5], bytes[4]);
block.CenterX = ((((int)bytes[7] & 0xff) << 8) | ((int)bytes[6] & 0xff));
block.CenterY = ((((int)bytes[9] & 0xff) << 8) | ((int)bytes[8] & 0xff));
block.Width = ((((int)bytes[11] & 0xff) << 8) | ((int)bytes[10] & 0xff));
block.Height = ((((int)bytes[13] & 0xff) << 8) | ((int)bytes[12] & 0xff));
return(block);
}
private void Read()
{
_Blocks.Clear(); // Clear the list of all previous blocks.
byte[] bytes = new byte[64]; // Create a new array to hold the byte data from the Pixy via I2C.
Port.Read(Address, 64, bytes); // Read the bytes from the Pixy into the array buffer.
int i = 0;
for (; i < bytes.Length; i++)
{
// Set the bytes to be greater than 0.
int byte1 = bytes[i];
if (byte1 < 0)
{
byte1 += 256;
}
int byte2 = bytes[i];
if (byte2 < 0)
{
byte2 += 256;
}
// Check if the end bytes have been received.
if (byte1 == 0x55 && byte2 == 0xaa)
{
break;
}
}
if (i == 63)
{
return;
}
else if (i == 0)
{
i += 2;
}
for (int byteOffset = i; byteOffset < bytes.Length - BlockSize - 1;)
{
int byte1 = bytes[byteOffset];
if (byte1 < 0)
{
byte1 += 256;
}
int byte2 = bytes[byteOffset++];
if (byte2 < 0)
{
byte2 += 256;
}
// Check if the end bytes have been received.
if (byte1 == 0x55 && byte2 == 0xaa)
{
byte[] temp = new byte[BlockSize];
for (int tempOffset = 0; tempOffset < BlockSize; tempOffset++)
{
temp[tempOffset] = bytes[byteOffset + tempOffset];
}
PixyBlock block = BytesToBlock(temp);
if (block.Signature == 1)
{
Blocks.Add(block);
byteOffset += BlockSize - 1;
}
else
{
byteOffset++;
}
}
else
{
byteOffset++;
}
}
}
