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Thread: Retrieving processed data from multiple Position2Go boards

  1. #1
    New Member New Member meera is on a distinguished road
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    Mar 2019

    Retrieving processed data from multiple Position2Go boards

    How to retrieve interleaved processed data (velocity, range, angle) from multiple Position2Go demo boards simultaneously using the Radar Host Communication C API? Tried to register multiple callbacks to obtain target info and passed the appropriate protocol handle and endpoint for each radar device. However, only the data from first radar device (at com port 1) is recorded. Any help with this?

  2. #2
    Beginner Beginner
    Infineon Employee
    Infineon Employee
    tinymanta is on a distinguished road
    Join Date
    Jan 2019
    Hi meera,

    Yes it is possible, but there are some pitfalls.

    In general the ComLib is capable to handle multiple connections at the same time. That’s why the connection handle must always be specified in each function call.
    You can easily start two Position2Godevices, and then call get_next_frame alternatively for both devices. OK, here the COM lib usage is not really simultaneously, but the devices are working simultaneously.

    The callback functions will be a little more complicated, because for both devices always the same callback with the same context pointer is called.
    The callback function must check the connection handle to find out what device sent the callback and route the data accordingly.

    To be really simultaneous, both devices must be handles in different threads. That will become somewhat complicated, because CommLib is not thread safe.
    It’s not possible to open different connections and register callbacks from different threads. If that setup part is kept in a common main thread, then fetching data from different threads should work.

    If you further want to do the setup in different threads, than there is a need for some wrapper code around ComLib that handles locking.

    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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