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TMS320F280049: How to receive 3 different length LIN data?

Daniel Fang
Genius 11600 points
Part Number: TMS320F280049

Hi,

On F280049 TRM Figure 27-8 Receive Buffers and Figure 27-9 Transmit Buffers, it says

“The 3-bit compare register contains the number of data bytes expected to be received or transmitted.the LENGTH value in SCIFORMAT register indicates the expected length and is used to load the 3-bit compare register.”

How to set LIN length when there are three different lengths data are received? My customer need to receive LIN data which length is 1, 7 and 8 byte separately.

Do we need to switch length value frequently? When to set SCIFORMAT register LENGTH?

We have enabled Multi-buffer mode by calling “LIN_enableMultibufferMode(base); in LIN initialization.

By the way, we find when use polling method to call LIN_isTxMatch(LINA_BASE) and LIN_isRxReady(LINA_BASE), it need to process LIN_isTxMatch(LINA_BASE) firstly, otherwise, LIN_isRxReady(LINA_BASE) can not be set after data received.

Thanks.

 

  • 0
    TI__Genius 15385 points

    Hi Daniel,

    Yes you will have to set length value frequently depending on the ID received since the length of each ID can vary.

    I presume that TMS320F390049 is acting as a slave device, and if customer is trying to receive the data why are they using LIN_isTxMatch() function?

    In order to set length based on ID, first ID should be read and then length needs to be set based on the received ID.

    1. Poll on LIN_isRXMatch(LINA_BASE) until the flag is set, to make sure the ID is received without any error.

    2. Read the ID using LIN_getRxIdentifier(LINA_BASE), and based on the ID set the frame length

    3. Set the frame length using LIN_setFrameLength() function

    Regards,

    Nirav