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IWR1642: Coordinates data extraction

Part Number: IWR1642

Hi,

in my application I am trying to get XY coordinates from IWR1642 device, reading from DATA_port UART; I am able to read and deserialize header (for example coherent magicword=0102-0304-0506-0708, version=02000004, platform=000a1642, TLVtype=1, Z=0, etc; hence I would exclude endianness issue) but the strange fact is that I am not getting any X negative value. Conversely, while running DemoVisualizer I actually have some negative X points:

am I missing any additional transformation/conversion?

Example:

...[4F][01][28][01][00][00]...->

X=335,Y=296,Z=0 (int16)

X=0.6542969,Y=0.578125,Z=0 (float)