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Packetsize PER-Test C1101 Developers Kit

Marcel Welpot
Prodigy 40 points
Other Parts Discussed in Thread: CC1101

Hi,

i am looking for the packetsize of the Standard PER Test Firmware from the c1101 868Mhz Developers Kit.

The size can be adjusted on the LCD display, but i am not sure if it is the data size or whole packet. I guess data only.

Thank you

  • 0
    TI__Genius 12735 points

    Hi Marcel

    The selectable size applies to the payload of the packet. In addition to that you will send  preamble, sync word and optional CRC bytes.

  • 0 in reply to Martin B
    Prodigy 40 points

    Thanks, thats good to know. I didnt find any information about that in the documentation.

    Can you give me some infos about the preamble, sync word and CRC sizes? Those are variable too.

    We want to compare the system PER results with a existing 868MHz application and for a vaild comparision those sizes should be the same.

  • 0 in reply to Marcel Welpot
    TI__Genius 12735 points

    Hi

    For this PER test the preamble and sync word are 4 bytes each( 8 bytes total). Both preamble and sync word is programmable to different lengths, please see the CC1101 data sheet for further details. The radio uses a 16 bit CRC algorithm so when CRC is enabled, the CRC bytes will always be 2 bytes.

  • 0 in reply to Martin B
    Prodigy 40 points

    Thank you so far.

    So i am still confused about the CRC. I am not able to turn on or off any CRC in the PER test. So i am wondering if it is enabled or disabled.

  • 0 in reply to Marcel Welpot
    TI__Genius 12735 points

    Hi

    The CRC is enabled in the PER test and there is no option to disable this in the SW without changing the code. The CRC calculation and check can be enabled/disabled through the PKTCTRL0.CRC_EN register bit field. On the receiver side a CRC OK can be read from the status bytes appended to the packet in the RXFIFO ( if PKTCRTL1.APPEND_STATUS = 1) or through status signal 0x07 on one of the GDO's. In the PER test the code checks for CRC OK in the status bytes.