UART C on efusA9X with on board WLAN/BT

  • Dear Support Team,


    We have efusA9X boards with on board WLAN/BT module. We are not using BT, so we have disabled support for it in BSP, and tried to use UART C to interface RS485 port on our hardware. After modification in BSP, I am able to open COM port related to UART C, I can even send the data from program on this COM port and read it on our RS485 port, so sending data is working. The problem is I cannot read data on UART C.


    Please tell me if this configuration is possible and, if it is, what should I do to make reading possible?


    Thanks in advance.


    Best regards,


    Miodrag Bazdar

  • Dear Miodrag Bazdar,


    we have to check options. With your current HW it is not possible. I will come back asp.

    F&S Elektronik Systeme GmbH
    As this is an international forum, please try to post in English.
    Da dies ein internationales Forum ist, bitten wir darum, Beiträge möglichst in Englisch zu verfassen.

  • Dear Miodrag Bazdar,


    unfortunatly it is not possible to use UART C if WLAN/BT chip is assembled, even if you deactivate BT.

    F&S Elektronik Systeme GmbH
    As this is an international forum, please try to post in English.
    Da dies ein internationales Forum ist, bitten wir darum, Beiträge möglichst in Englisch zu verfassen.

  • One more thing, please.


    What is the meaning of registry value RS485 (REG_DWORD) in driver for Serial I/O (UART)?


    Is RTS_CONTROL_TOGGLE flow control supported by serial driver on efusA9X? Our RS485 interface is using three lines: Rx, Tx and RTS which is used to select direction of data transmission.


    Thanks in advance.


    Best regards,


    Miodrag Bazdar

  • Hello,


    >> Is RTS_CONTROL_TOGGLE flow control supported

    << Yes, this should work.


    >> At first view seems there is a bug in the driver: RTC and CTS are interchanged!

    I can check it in detail next week.

    F&S Elektronik Systeme GmbH
    As this is an international forum, please try to post in English.
    Da dies ein internationales Forum ist, bitten wir darum, Beiträge möglichst in Englisch zu verfassen.

  • Dear Support Team,


    I am not sure I understand you. You say RTS_CONTROL_TOGGLE should work, but there is a bug in the driver. It cannot work then, right? Or you meant to say it will work, but it will drive CTS line instead of RTS?


    Best regards,


    Miodrag Bazdar

  • Dear Miodrag Bazdar,


    sorry for confusion.


    >>Or you meant to say it will work, but it will drive CTS line instead of RTS?

    << Yes, your assumtion is right, that is what i meant. At a first view it looks like CTS is configured as output and RTS as input! A try is it worth.

    F&S Elektronik Systeme GmbH
    As this is an international forum, please try to post in English.
    Da dies ein internationales Forum ist, bitten wir darum, Beiträge möglichst in Englisch zu verfassen.