[ABANDONED] How to Stop RTT Communication Attempts After USB Disconnected

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  • [ABANDONED] How to Stop RTT Communication Attempts After USB Disconnected

    I'm using J-Link RTT on a Nucleo F429ZI on-board debugger. When I unplug the USB connection from the debugger, my debugger continues to try communicating (as the LED on my debugger continues to blink). I'm wondering if there's anyway I can detect that the USB has been disconnected from the J-Link RTT debugger, to stop any farther attempts to transmit or receive through the RTT, until a connection has been re-established. I'm wondering if there's any recommended way of doing this? Whether I would just count the consecutive errors from SEGGER_RTT_printf() functions or if there is a better way of doing this.

  • Hi,
    Thank you for your inquiry.
    We are not entirely sure if we understand you correctly.
    What exactly are you trying to achieve?

    From what we understand you do the following:
    1. Nucleo board is connected via onboard J-Link to a PC and at the same time you are powering the board externally as well.
    2. Then you cut the connection between PC and J-Link.
    Correct?

    In general:
    J-Link side:
    As soon as the connection between J-Link and PC is cut, the J-Link enters the enumeration mode (waiting for a PC to enumerate the J-Link), so in this time no RTT Data is read or sent via the J-Link.
    Target side:
    What happens on target side depends on the channel buffer configuration.
    For more information about channel buffer configuration, please refer to the J-Link User Manual (UM08001), Chapter: 16.4.2.2 Channel buffer configuration.

    Best regards,
    Fabian
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