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CCS/TMS570LS0432: TMS570ls04 Launchpad R8 register

Indrajit Lawande95
Expert 1350 points

Part Number: TMS570LS0432
Other Parts Discussed in Thread: BQ76PL455A-Q1,

Tool/software: Code Composer Studio

Hi , I am using TMS570ls04 launchpad for SCI communication. I have reference programme for that but in that programme it is mentioned that you have remove R8 from launchpad for proper readings of UART received data . But I am not getting actually why to remove that register. I am new to this controller . what happened when i removed it and if i kept as it ?

Thank you. 

  • 0
    TI__Guru**** 199476 points

    Hello,

    The SCI1_TX and SCI1_RX are connected to FTDI chip, then to USB port. FTDI on the launchpad is a USB to UART/JTAG IC. You can send UART commands from PC termianl to Lauchpad via the USB cable. If you remove the R8, the receive will not work properly. Where did you get this information?

    Regards,

    QJ

  • 0 in reply to QJ Wang
    Expert 1350 points

    I am referring bq76pl455A-Q1 example code provided by TI.  At the top of code i found following 

    * This code was written for the TMS570LS04x Launchpad Board, modified to remove R8, allowing use of the SCI1 UART.
    * A bq76PL455A-Q1 EVM single-ended communication interface is connected to the Boosterpack connectors J1 and J2 as
    * shown below. Connection of these boards must be made by the user.

    Thank and Regards

    Indrajit.

  • 0 in reply to Indrajit Lawande95
    TI__Guru**** 199476 points
    Hello,

    On the TMS570LS0432 MCU, there is only one UART port that is used for the communication with the BQ76PL455A-Q1 device. A second UART
    is created by the N2HET timer module on the TMS570LS0432 MCU to communicate with PC.

    On the TMS570LS0432 LaunchPad, the TMS570LS0432 UART is connected to the XDS100V2 FT2322HL IC for user to communicate with the TMS570LS0432 device through a USB UART port on the host PC. This connection must be replaced by the UART emulated by the N2HET module.

    To make those work, the following changes should be make on the launchpad:
    1. Remove R8 and R9
    2. Connect J4-1 (NHET00 to emulate UART TX) to U2 (FT2322HL) pin 39
    3. Connect J4-2 (NHET02 to emulate UART RX) to U2 (FT2322HL) pin 38

    Regards,
    QJ
  • 0 in reply to QJ Wang
    Expert 1350 points
    Thank you for providing detail explanation.

    I have one more doubt , when i was using C2000 piccolo launchpad for communication with same IC (bq76pl455) , at that time i am able to send command to that IC via UART but unable to see the received data via RX-pin in code composer studio watch-variable window . is it same problem with piccolo because that launchpad has only one uart ??

    Regards,
    Indrajit.
  • 0 in reply to Indrajit Lawande95
    TI__Guru**** 199476 points
    Hello,

    Might be the similar problem. I am not familiar with C2000 launchpad. Please post this question to C2000 forum. Thank you.

    Regards,
    QJ
  • 0 in reply to QJ Wang
    Expert 1350 points
    Thanks for suggestion .
    I will post on c2000 forum.