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How to get an output from uart1 or uart0?

user4672609
Prodigy 20 points
Other Parts Discussed in Thread: TMS320C6748

Hi, I just bought the TMS320C6748 LCDK and tested some features. When i try the uart example that uses the UART2 I receive output data from the J3 port easily but when I try to change to the UART1 (pins 17 and 19) or UART0 (pins 29 and 31) connecting my HC-05 module to the J15 pins I don't receive any data. There is something I need to do? I read at another topics something about shortcircuit something.

Thank you very much for the responses.

  • 0
    TI__Guru** 116100 points

    Have you confirmed that UART0 is working on LCDK board by probing the UART0 pins while sending data to UART0 ??
    Also you should modify the UART example to UART0 like changing the PSC no for UART0 etc.,

    Ex:
    /* Enabling the PSC for UART0.*/
    PSCModuleControl(SOC_PSC_0_REGS, HW_PSC_UART0, PSC_POWERDOMAIN_ALWAYS_ON,
    PSC_MDCTL_NEXT_ENABLE);

    /* Setup PINMUX */
    UARTPinMuxSetup(0, FALSE);

    /* Enabling the transmitter and receiver*/
    UARTEnable(SOC_UART_0_REGS);



    There is something I need to do? I read at another topics something about shortcircuit something.

    Firstly, you should confirm that UART0 is working fine and you did necessary things in HW.
    Actually UART0 pins are muxed with MII (Ethernet) interface, you should unpopulate the R172 and R173, populate 0ohms resistors in R218 and R219.

    Also,
    Have you checked the HC-05 Bluetooth data sheet and what kind of signal will be supported for this device ?
    UART TTL level or UART RS232 level ?

    If it supports TTL level, then you should use TTL-RS232 converter circuit between HC-05 module and LCDK board.

    I have interfaced the HC-05 Serial Bluetooth module to controller, so you may need TTL to RS232 converter to interface with processor.

    http://www.ebay.in/itm/141661654500?aff_source=Sok-Goog

  • 0 in reply to Titusrathinaraj Stalin
    TI__Guru* 81335 points

    Welcome to the TI E2E forum. I hope you will find many good answers here and in the TI.com documents and in the TI Wiki Pages (for processor issues). Be sure to search those for helpful information and to browse for the questions others may have asked on similar topics (e2e.ti.com).

    Note: We strongly recommend you to create new e2e thread for your queries instead of following up on an old/closed e2e thread, new threads gets more attention than old threads and can provide link of old threads or information on the new post for clarity and faster response.