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The MAXLEN field in the PCNF1 register , Ieee802154_250Kbit radio mode

user108266

Hello !

What extra field need to be included ti MAXLEN calculation in case of Ieee802154_250Kbit radio ?

CRC , len ? I try to limit total amount of received bytes but any value cause some problem and data is not received.

If I use 125 max value ( I use CRC ) , everything works.

Regards,

Eugene

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    Hi,

    The MAXLEN field is described in the EasyDMA chapter in the RADIO documentation:

    The radio packets elements can be configured as follows:
    • CI, TERM1 and TERM2 fields are only present in Bluetooth low energy long range mode
    • S0 is configured through the S0LEN field in PCNF0
    • LENGTH is configured through the LFLEN field in PCNF0
    • S1 is configured through the S1LEN field in PCNF0
    • Size of the payload is configured through the value in RAM corresponding to the LENGTH field
    • Size of the static add-on to the payload is configured through the STATLEN field in PCNF1

    The MAXLEN field in the PCNF1 register configures the maximum packet payload plus add-on size in number of bytes that can be transmitted or received by the RADIO. This feature can be used to ensure that the RADIO does not overwrite, or read beyond, the RAM assigned to the packet payload. This means that if the packet payload length defined by PCNF1.STATLEN and the LENGTH field in the packet specifies a packet larger than MAXLEN, the payload will be truncated at MAXLEN.

    Note: The MAXLEN includes the payload and the add-on, but excludes the size occupied by the S0, LENGTH and S1 fields. This has to be taken into account when allocating RAM.

    If the payload and add-on length is specified larger than MAXLEN, the RADIO will still transmit or receive in the same way as before, except the payload is now truncated to MAXLEN. The packet's LENGTH field will not be altered when the payload is truncated. The RADIO will calculate CRC as if the packet length is equal to MAXLEN.

    Best regards,
    Jørgen

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  • 0

    Hi,

    The MAXLEN field is described in the EasyDMA chapter in the RADIO documentation:

    The radio packets elements can be configured as follows:
    • CI, TERM1 and TERM2 fields are only present in Bluetooth low energy long range mode
    • S0 is configured through the S0LEN field in PCNF0
    • LENGTH is configured through the LFLEN field in PCNF0
    • S1 is configured through the S1LEN field in PCNF0
    • Size of the payload is configured through the value in RAM corresponding to the LENGTH field
    • Size of the static add-on to the payload is configured through the STATLEN field in PCNF1

    The MAXLEN field in the PCNF1 register configures the maximum packet payload plus add-on size in number of bytes that can be transmitted or received by the RADIO. This feature can be used to ensure that the RADIO does not overwrite, or read beyond, the RAM assigned to the packet payload. This means that if the packet payload length defined by PCNF1.STATLEN and the LENGTH field in the packet specifies a packet larger than MAXLEN, the payload will be truncated at MAXLEN.

    Note: The MAXLEN includes the payload and the add-on, but excludes the size occupied by the S0, LENGTH and S1 fields. This has to be taken into account when allocating RAM.

    If the payload and add-on length is specified larger than MAXLEN, the RADIO will still transmit or receive in the same way as before, except the payload is now truncated to MAXLEN. The packet's LENGTH field will not be altered when the payload is truncated. The RADIO will calculate CRC as if the packet length is equal to MAXLEN.

    Best regards,
    Jørgen

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