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M
Myurt.1
Visitor II
August 10, 2020
Question

HAL_CAN_AddTx Message returns HAL_CAN_ERROR_PARAM

  • August 10, 2020
  • 1 reply
  • 1007 views

Hi everyone,

I am working with STM32F405 and trying to transmit 16bit data using CANBus line including several units (motor controller, Bms and other circuits). Our CANBus line works fine for a long time. Now I am trying to add one more device to our line. I can receive all datas from other devices connected to CANBus, but when transmitting, after a few minutes HAL_CAN_AddTx Message() function returns HAL_CAN_ERROR_PARAM and then never transmits the data. When I debug the code, I saw that inside HAL_CAN_AddTx Message() code checks whether there is an empty mailbox or not and all three mailboxes seems full and function returns HAL_CAN_ERROR_PARAM. I checked mailboxes using HAL_CAN_GetTxMailboxesFreeLevel function and saw that when error occures it returns 3 meaning all mailboxes are full. This only happens after a few minutes transmitting data without problem. I tried loopback mode and it works fine. I read similar problems and could not find a soluiton. I will be grateful if someone can help.

Thanks.

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    1 reply

    R
    RAnan.3
    Visitor II
    August 10, 2022

    Hey, Is your issue sorted? I am facing the exact issue with my controller STM32l452RC. Can you please drop the solution if this has been sorted?

    Or could anyone share a solution for this ASAP?

    Thanks.

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