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CC430F5137: Measuring time of flight

zina mohamed
Prodigy 20 points
Part Number: CC430F5137
Other Parts Discussed in Thread: CC1101

HI,

I have two boards based on CC430F5137 microcontoller (MSP430 core + CC11XX radio SOC). I would like to measure the time that takes a message to travel from the sender to the receiver.

could you please help me by some ideas.

Regards,

  • 0
    TI__Mastermind 36395 points
    Zina,

    The CC430F5137 is based on the CC1101 transciever and an MSP430. From the datasheet you will find a signal that can be outputted to a GPIO called "Packet/SYNC" or as I like to call it "Option 0x06". Its found on page 712 of the user guide.

    www.ti.com/.../slau259e.pdf

    Here is a copy of the description : "Asserts when sync word has been sent or received, and deasserts at the end of the packet. In RX, the pin deassert when 6 (0x06) the optional address check fails or the RX FIFO overflows. In TX the pin deasserts if the TX FIFO underflows."

    This signal will go high and low for both TX and RX when a packet is being sent of received and the signal comes from inside the RF core. This is the most accurate signal available.

    I hope this helps.

    Regards,
    /TA