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RTOS/TDA2: TDA2 utils_dcan question

Markii
Intellectual 340 points
Part Number: TDA2


Tool/software: TI-RTOS

Hi,

we use utils_dcan in SDK_VISION_03_04 and found something strange.

we connect our device to the car with OBD connector, we want to read the velocity.

the symptom is sometimes we can read the velocity and sometimes we can not read the velocity.

and when we can not read, we need to restart the device and re-connect to the car.

after some tests, we found the period call function still post event, but this event seems not trigger Utils_dcanTxTsk to send the read command.

could you please help to give some hints or possibility to cause this symptom

Thanks~~~

  • 0
    TI__Expert 5615 points
    Hi Markii,

    I have few questions of this sentence 'after some tests, we found the period call function still post event, but this event seems not trigger Utils_dcanTxTsk to send the read command.'
    1. Are these number of successful tests before seeing failure point same for each run?
    2. This send command is actual a CAN message, right? So you seeing failure with CAN message transmission.

    Can you explain about the transactions happening in your CAN network? Like general flow of messages.

    Thanks & Regards,
    Vivek Dhande.
    Texas Instruments (India) Pvt Ltd
  • 0 in reply to Vivek Dhande
    Intellectual 340 points

    Hi Vivek,

    we enable periodic Tx and set txMsgPeriod_ms as 500 in dcanConfig.

    normally, we can get velocity every 500ms

    (Utils_dcanPrdCalloutFcn would do Event_post every 500ms, after event post we can read velocity from RxTsk)

    but sometimes we can not read the velocity suddenly (previous 500ms is ok), and if this symptom happened, we need to restart our device and re-connect to the car (unplug the connector and plug)

    we trace the source code and found the Utils_dcanPrdCalloutFcn still post event every 500ms, but the Utils_dcanTxMsg did not finish. and hang on Utils_dcanWaitForTxComplete.

    this symptom happen very often, we do not know why, could you please help to give us some advisement.

    Thanks~~

  • 0 in reply to Markii
    TI__Expert 5615 points
    Hi Markii,

    By default automatic re-transmission is disabled in the DCAN demo.
    Can you please 'pDcanCfgPrms->autoRetransmitDisable' change from 'TRUE' to 'FALSE' in 'utils_dcan.c' file and re-try this application?

    Looks like your transmission is failing and transmission failing condition is not handled in the app. By enabling re-transmission, CAN controller will keep sending failed message until it succeeds.

    Thanks & Regards,
    Vivek Dhande.
    Texas Instruments (India) Pvt Ltd