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CC2541: Direct Test Mode (DTM) - Determining Pass/Fail for HCI_LE_Receiver_Test (ETSI EN 300 328 V2.2.2)

KL74
Prodigy 90 points
Part Number: CC2541
Other Parts Discussed in Thread: CC2652R

I have a custom board with an MSP430 micro that talks to my CC2541 over SPI.  I can successfully issue HCI commands and command my CC2541 into DTM with HCI_LE_Receiver_Test command (PRBS9, 37-byte length, any channel).

I can use HCI_LE_Test_End to exit the test mode, and I received number of packets in the event response.

My question is, how can I determine whether or not the test is a pass or fail?

The signal generator sends 1500 PRBS9-37 packets.  Is the number of packets returned in the event response the number of packets received without error, where we can take (Number_Of_Packets / 1500) to get an error rate?  Or, will the event return status returned from the call to HCI_LE_Test_End provide me with an error?

keywords: rx blocking, receiver blocking, HCI_LE_Transmitter_Test

  • 0
    Prodigy 90 points

    Additionally, is there anyway to determine that there is an ongoing connection/packets being received from the device that is in Receiver mode, or is it a synchronous operation--device must enter receiver test mode, then exit test mode, and read the number of packets received?

  • 0 in reply to KL74
    TI__Mastermind 25810 points

    Hey KL,

    I've assigned this post to a colleague to comment on.

  • 0 in reply to Ammar N
    TI__Guru**** 171254 points

    Hi,

    KL74 said:
    My question is, how can I determine whether or not the test is a pass or fail?

    I am not very familiar with the older CC2541 family of devices, but the HCI_LE_Receiver_Test API should simply return a PASS/FAIL return code according to the Bluetooth Spec.Check Part E section 7.8.28, which can be downloaded from:

    https://www.bluetooth.com/specifications/specs/core-specification-4-2/ 

    In a similar fashion, section 7.8.30 mentions the HCI_LE_Test_End should return both status and number of packets.

    KL74 said:
    Is the number of packets returned in the event response the number of packets received without error, where we can take (Number_Of_Packets / 1500) to get an error rate?

    Indeed. The LE controller will not acknowledge a malformed package as "received".

    I have experience using a complete BT testset on our newer devices (CC2640R2, CC2652R), where all this is done for you automatically.

    Hope this helps,

    Rafael

  • 0 in reply to desouza
    Prodigy 90 points

    The HCI_LE_Receiver_Test API response tells you if it successfully entered the mode, not if the test passes or fails.

    I will use the HCI_LE_Test_End event status response to calculate the number of received packets compared to the number of packets sent to determine if the boards PASS/FAILS according to ETSI EN 328 V2.2.2 RX Blocking tests.

    Thank you,

    Kevin