How to enable vcom function before connect target with swd.

This site uses cookies. By continuing to browse this site, you are agreeing to our Cookie Policy.

  • How to enable vcom function before connect target with swd.

    I connect target device with swd (7pin 9pin 2pin) and connect with vcom (5pin 17pin). and enbaled jlink vcom.
    but no output (gtkterm app connect vcom dev, but no output).
    how to use vcom function?

  • Hi,

    tinydrop wrote:

    I connect target device with swd (7pin 9pin 2pin)
    It should be:
    7 - SWDIO
    9 - SWCLK
    1 - VTREF (not 2)
    5 - J-Link-Tx (J-Link out => Target in)
    17 - J-Link-Rx (J-Link in => Target out)
    One of the pins you mention is wrong.

    If this does not fix the issue:
    Could you please check the following?
    wiki.segger.com/Using_J-Link_V…M_functionality_and_speed
    If the self test works, the issue lies on either
    - the connection between Target & J-Link (Faulty cables, Wrong pins connected, ...) o
    - on target side (wrong pins toggled, no data send, ...)
    We advise to use a Oscilloscope for signal verification.

    Could you please check?

    BR
    Fabian
    Please read the forum rules before posting.

    Keep in mind, this is *not* a support forum.
    Our engineers will try to answer your questions between their projects if possible but this can be delayed by longer periods of time.
    Should you be entitled to support you can contact us via our support system: segger.com/ticket/
    Or you can contact us via e-mail.