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interfacing RM48 through SCI with IMX6 processor (ARM9) through UART.

Manjunathan K
Expert 2825 points

Other Parts Discussed in Thread: MAX232

Hi,

My objective is to interface RM48 HDK (SCI)  with free scale processor IMX6 SOM through UART.

Processor is front end system to control GUI and RM48 Controller is back end in my Application.

I have just started to work in communication. is it right way to do so?

Am only using Rx and Tx pin. will it work.

Regards

K.Manjunathan

PSGIAS.

  • 0
    TI__Guru 69070 points
    K.Manjunathan,

    This should work. Since you mention RX and TX pins on the HDK I assume then that you are not using the same UART (or are disconnecting it by removing resistors on the board) that is used with the XDS100v2 .. because that UART is already connected to the FTDI chip and you actually talk to it via a USB VCP interface in the FTDI chip.

    So assuming you don't have the FTDI chip in the path - then yes RX & TX should be fine as long as you only use no flow control or software flow control (like XON/XOFF) on both sides of the link.

    The biggest worry I would have is that the logic levels are both 3.3V LVCMOS and that there is no sort of line driver/receiver IC like www.ti.com/lit/ds/symlink/max232.pdf on the SOM.

    If the voltage levels out of the SOM are not 3.3V LVCMOS then you may need a voltage translator or compatible line driver/receiver between the SOM and the HDK.

    -Anthony
  • 0 in reply to Anthony F. Seely
    Expert 2825 points
    Thank you Sir. I will check the voltage levels out of the SOM

    Regards

    K.Manjunathan

    PSGIAS
  • 0 in reply to Anthony F. Seely
    Expert 2825 points
    hi Mr.Anthony Seely

    Please Recommend a suitable line driver IC for establishing communication between HDK and imx6

    Thanks and regards
    K.Manjunathan
  • 0 in reply to Manjunathan K
    TI__Guru 69070 points
    Hi Manjunathan,

    I really can't recommend anything; without knowing the voltage levels out of the SOM.
    I gave one example, which was for the RS-232 standard (www.ti.com/lit/ds/symlink/max232.pdf).
    But if your SOM is fixed, and you are designing a board for the HDK, then what you need to do is match the
    standard used by the SOM.

    If you need help with the interface chips, I would probably suggest posting the question on this forum:
    e2e.ti.com/.../ Because that will get you in touch with TI's interface experts.
    (Here on this forum it is microcontrollers, we know the basics about microcontroller interfacing but not as much as the
    experts on the interface forum probably will. For example they can probably guide you to an optimal solution whereas the
    max232 is just an example and probably sub-optimal).