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TMS320F28379D: Custom board with F28379D and external XDS100v2 from Spectrum Digital SCI-A serial port not working

IRMA VILLAR ITURBE
Prodigy 10 points
Part Number: TMS320F28379D
Other Parts Discussed in Thread: LAUNCHXL-F28379D, , TMDSEMU110-U

ear all,

I have a Simulink model that I can build and load with a LAUNCHXL-F28379D with an on-board xds100v2, as well as, with a custom board with a TMS320F28379D and external XDS100v2 from Spectrum Digital, I use the same code in both cases. I do not have any issues with the JTAG pins in both cases. However, when I want to use the external mode from Simulink which uses SCI-A, I can connect with the LAUNCHXL-F28379D without any issues, setting the correct COM port and SCI-A pins GPIO42 and GPIO43, but not with the custom board with TMS320F28379D and external XDS100v2 which uses the same pins (I have solutions with pull-up resistors and without them in these pins, but nothing).

In the external XDS100v2 I have the XDS100 Class Auxiliary Port set as Virtual COM port to use it as serial port. I have concluded that this second port are the GPIO43/SCIARX(->MCU) and GPIO42/SCIATX(<-MCU) pins like in the LAUNCHXL-F28379D and should work exactly in the same way in my custom board solution. But the serial connection does not work, I do not see any attempt even to send a message.

I have also tried the same with a XDS110 debug probe, which I am able to build and load with my custom board, but the serial in the XDS110 Class Application/User UART does not work either.

Am I missing anything?

Regards,

Irma.

  • 0
    TI__Mastermind 28111 points

    Hi Irma,

    IRMA VILLAR ITURBE said:
    In the external XDS100v2 I have the XDS100 Class Auxiliary Port set as Virtual COM port to use it as serial port. I have concluded that this second port are the GPIO43/SCIARX(->MCU) and GPIO42/SCIATX(<-MCU) pins like in the LAUNCHXL-F28379D and should work exactly in the same way in my custom board solution.

    How did you arrive at this conclusion? Per my understanding neither the 14-pin nor the 20-pin header on the SD XDS110v2 probe bring out the UART pins.

    IRMA VILLAR ITURBE said:
    I have also tried the same with a XDS110 debug probe, which I am able to build and load with my custom board, but the serial in the XDS110 Class Application/User UART does not work either.

    The UART pins come out on a different connector, separate from the JTAG connector (check the user guide for the XDS110 debug probe). Are you connecting to the right pins?

  • 0
    Prodigy 10 points

    Hi Gus,

    I have seen the following question/answer in the FAQ of the XDS100v2, so I thought it was feasible. I see this second port but afterwards it does not work.

    Irma.

  • 0 in reply to IRMA VILLAR ITURBE
    TI__Mastermind 28111 points

    Hello Irma,

    Are you able to physically connect the FTDI Port B TX and RX pins on the XDS100v2 to the MCU SCI-A pin then? Sorry, I don't have this debug probe available, so I don't know if this is possible. 

    Were you able to get the XDS110 COM port working?

  • 0
    Prodigy 10 points

    Hi Gus,

    I have pin 13 and pin 14 of the 14-pin JTAG connector connected to GPIO42 and GPIO43 of the F28379D, which are assigned as SCI-A Tx and SCI-A Rx, respectively.

    In the XDS100v2 debug probe I see XDS100 Class USB Serial Port, which is the Virtual COM Port of the XDS100 Class Auxiliary Port (Port B).

    In the XDS110 debug probe I also see both COM ports, the XDS110 Class Application/User UART and XDS110 Class Auxiliary Data Port. I want to use the User UART part.

    If I connect the LAUNCHXL-F28379D which has an on-board XDS100v2 I see the same ports and in this case the serial is working fine.

    I have reasigned several times de COM port numbers, but that's not it.

    Irma.

  • +1 in reply to IRMA VILLAR ITURBE
    TI__Mastermind 28111 points

    Irma,

    IRMA VILLAR ITURBE said:
    I have pin 13 and pin 14 of the 14-pin JTAG connector connected to GPIO42 and GPIO43 of the F28379D, which are assigned as SCI-A Tx and SCI-A Rx, respectively.

    Pins 13 and 14 on a standard 14-pin JTAG connector are assigned to EMU0/EMU1 function. Neither the XDS100v2 or XDS110 will support SCI/UART functionality on the 14-pin JTAG headers.

    For the Spectrum Digital XDS110v2, you can see the pinout of the 14-pin and 20-pin JTAG header on the schematic screengrab below. Given that this is a Spectrum Digital design (not TI design) I may not have the latest schematic files, but I'm fairly certain this COM feature is not supported anywhere on this debug probe.

    For the XDS110 debug probe (TMDSEMU110-U to be clear), you need to connect the MCU SCI pins to the AUX connector, see below.

  • 0 in reply to Gus Martinez
    Prodigy 10 points

    Thank you very much Gus. The FAQ of the XDS100v2 mentioning the UART as well as the name assigned in the XDS110 to the debug probe (yes, the TMDSEMU110-U) XDS110 Class Application/User UART made me thought that this was possible. I must confess that this naming is confusing.