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CCS/TMS320F28379D: SCI Pin gets Shorted while communication extablished between Motor driver and Launchpad XL

Ajay S
Expert 1280 points

Part Number: TMS320F28379D
Other Parts Discussed in Thread: LAUNCHXL-F28379D

Tool/software: Code Composer Studio

Hi,

           I am using Launchpad XL F28379D , By using that established RS485 communication between Motor driver and Controller board . Communication is controlled by switch , for my application want to activate driver one by one .when I am started with first driver its works fine , so then I have started  second drive to be activate. Unfortunately my boards gets turned off. So I left the all connection and checked continuity between the all the pins . My SCI - RX pin gets Shorted with 3.3V in board pins.

I have checked my Switch pins delivers 3.3v and 0v during operations.

I have use level converter in between the controller board RS485 module .

Here terminal resistor also added in module itself .

Thanks  & Regards,

Rani



  • 0
    TI__Mastermind 45606 points

    Hi Ajay,

    Your system and boards configuration isn't clear to me. Can you please further explain how you are connecting and powering your LAUNCHXL-F28379D and motor drive boards? Are you using TI motor driver boosterpacks, such as a BOOSTXL-DRV8305?

    Also can you further explain your SCI / RS485 interface? Is this a separate board as well?

    Best,

    Kevin

  • 0 in reply to Kevin Allen18
    Expert 1280 points

    Kevin,

    Kevin Allen18 said:
    Can you please further explain how you are connecting and powering your LAUNCHXL-F28379D and motor drive boards?

    Launchpad is powering by USB

    Also can you further explain your SCI / RS485 interface? Is this a separate board as well?

    Thanks & Regards,

    Rani 

  • 0 in reply to Ajay S
    TI__Mastermind 45606 points

    Rani,

    Thanks for the additional details. Is the 5V USB powering anything more than the LaunchPad? Please note that USB 2.0 power is limited to 500mA of current.

    You said it works when driver 1 is running, but that your board (LaunchPad?) shuts off when running both driver 1 and 2 are running. Does it work OK when only driver 2 is running?

    What are SW1 and SW2 controlling in your diagram? Are the switch ends just connected to GPIO headers of the F28379D controller?

    Best,

    Kevin