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USB-RSxxx converter on TIVA C Series Connected Launchpad

Gregg Sparrow
Prodigy 20 points

Other Parts Discussed in Thread: TM4C1294NCPDT

Is there a way to make USB-to-RS232 or USB-to-RS485 converter on Tiva C Series Connected Launchpad?

For example, assign EN0RXIN/EN0RXIP as input/output pins for RS interface and make Ethernet act like RS-232 or RS-485 port?

As I see from doc on TM4C1294NCPDT they are fixed and no pin mux/pin assignment possible, but I wonder is there a "dirty way"...

  • 0
    TI__Guru**** 244450 points
    Hello Gregg

    You would be probably looking for the Serial to Ethernet TI Design.

    www.ti.com/.../TIDM-TM4C129XS2E

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Prodigy 20 points

    Hello Amit,


    No this is not quite the solution I was looking for, but thank you for pointing to the nice design idea.

    The general idea I was thinking of if is usb-to-serial adapter with ability to monitor data flow on second serial device

    Here is what I was thinking of:

    +---------------+          +-----------------------------+        +---------------------------------+
    |RS-232/485|<----->| [ifEth]   TIVA C [ifUSB] |<---->| [ifUSB][COM5] PC Host  |
    | device         |            | Conn. Launchpad      |          |              [COM6]                  |
    +---------------+          +-----------------------------+         +---------------------------------+

    where PC Host can send and receive data to COM5, and, as optional, monitor sent and recieved data flow on COM6. Something like usb_dev_cserial example, maybe. If using Ethernet connector for this is impossible, I should use free GPIOs, I guess...

  • 0 in reply to Gregg Sparrow
    TI__Guru**** 244450 points
    Hello Gregg

    I am not sure based on the block diagram how the Ethernet device is communicating directly with a RS232/385 device. There must be an adapter?

    It should be possible to bridge Etherent to USB.

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Genius 4680 points

    Hi Amit,
    As replacement of DB9 connector, RJ-11(phone)/RJ-45(Ethernet) connectors are also applied to RS-232/422/485.

    Greg,
    The Ethernet socket on the launchpad has isolation magnetics between the MCU ports and the socket pins. The socket isn't available for RS-232/485.

    Tsuneo

  • 0 in reply to Tsuneo Chinzei
    TI__Guru**** 244450 points
    Hello Tsuneo,

    But in this case the poster seems to be interfacing a Ethernet Interface to RS232 (and not just a socket)

    Regards
    Amit