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MSP430F5249: backchannel UART

David M. Alter
Guru 61235 points
Part Number: MSP430F5249
Other Parts Discussed in Thread: MSP-FET

I am trying to understand how to use the backchannel UART available in the MSP-FET tool.  SLAU647L section 5.6.2.1 says you need to send an activation command:

How exactly do you send the activation command?  The text says "By opening the corresponding COM port with a dedicated baud rate."  I'm not sure what this means.  Most terminal programs will not allow the listed unusual baud rates.

Thank you,

David

  • 0
    TI__Genius 10980 points
    Hi David,

    If you do not send any activation commands, you will still be able to use the backchannel UART, as it will just use the default settings. If you want to use the activation commands, most terminal programs will allow you to enter a custom baud rate (even if it is not in the drop down). One such example is Termite.

    Regards,
    Nathan
  • 0
    Guru 317480 points
    These activation commands are usually not needed because the default settings work fine.

    If your terminal program does not allow custom baud rates, use another one that does (e.g., screen in Linux).
  • 0 in reply to Nathan Siegel
    TI__Guru 61235 points
    HI Nathan,

    Thank you for your response. So it that all the "Activation command" is, opening the terminal program with the specified command baud rate? I've got to wonder how the FET pod is able to differentiate between a baud rate of say 9600, and the activation command of 9601. This just seems a little weird. Can you explain a little bit more on what the user actually needs to do here?

    Thank you,
    David
  • 0 in reply to David M. Alter
    TI__Genius 10980 points
    Hi David,

    The FET is not differentiating between baud rates, as a serial connection has not been opened. Rather, using these activation command causing the terminal window to send the command to the FET over USB. So, the user just needs to start with the activation commands, as described in the User's Guide. After the desired activation command has been sent, the user should open the connection with the desired baud rate. Communication will now take place using UART (over the USB hardware).

    Regards,
    Nathan

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