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CC1101DK PER

Sal LaRussa
Genius 10010 points

On the LCD display, after completion of a PER, when scrolling thru the screens, one page says "Master-->Slave sent 1612 of 16,384" while another says "Master->Slave Lost 15,734 of 16,384".  I'm wondering why the "sent" + "lost" don't add up tp 16384.  I assume the 1612 is success packets sent, where the 15734 include retries when there is a CRC, is that correct?   

  • TI__Expert 3595 points

    I will have to pull out the manual to get the exact wording, but yeah the math doesn't always add up exactly as some other factors are taken into the calculations.

  • TI__Guru* 86241 points

    I think the displayed PER is defining faulty packets as packets received with CRC plus packets that where never received.

    If you expected a 1000 packets and the PER is 10%, you know that 100 packets where either received with errors or never received at all.

    When trying to improve PER it can be useful to distinguish between packets that where never received (error in preamble or sync) and packets that were actually received.

    I think the lost packet number indicated how many packets that where never received (a counter is incremented every time the RX timeout expires.)