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CC2640: Transmitter Test vs Read RSSI Command

Kota Suzuki
Intellectual 270 points

Part Number: CC2640
Other Parts Discussed in Thread: CC2650

Setup environment:

1 CC2640 PCB to use HCI Transmitter Test (5dbm), frequency 2402, used HCI EXT Set Tx Power (-21dbm) to check that the RSSI value was correctly reflected.

1 CC2640 PCB to use HCI Receiver Test -> Read RSSI Command, frequency 2402

 

I am trying to read the RSSI value of a transmitter test, but the transmitter test will not create a connection handle since a connection will not be established.

If I set the connection handle to 0x0000 when I send the Read RSSI command, will it be able to catch the RSSI of the transmitter test? (Assuming same frequency)

I am asking this because setting a connection handle of 0xFFFE gave me an RSSI of -27, but using the Set Tx Power command did not change the RSSI value. (Changed from 5dbm(max) to -21dbm)

 

  • 0
    TI__Guru** 105180 points
    Hello,

    Yes, you can use conn handle 0x0000 during the modem RX test to read RSSI.

    I suggest using SmartRF Studio 7 to confirm you HW is working as expected. You can control TX power for a continuous TX test at different output power levels with this tool. If you don't have RF test equipment to measure RF power, I suggest using a CC2650 or CC2640R2 LaunchPad as the receiver.

    Best wishes
  • 0 in reply to JXS
    Intellectual 270 points
    Hello JXS
    Thank you for your very helpful answer, I was able to move a few steps further.

    With the setup environment I have stated above, the RSSI value does not seem to change when I change the Tx Power from 5dbm to -21 dbm.
    On the other hand, like you have stated, if I use the modem tx test and modem rx test, I can see the RSSI value change if I change the Tx Power.

    Why is it that I cannot see a difference in RSSI value if I use the HCI Transmitter Test and change the Tx Power?
    What is the difference between the HCI Transmitter/Receiver Test and the HCI EXT Modem Tx/Rx Test in terms of retrieving the RSSI value?