• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 31 subscribers
  • Views 404 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

j link adapter for TM4C123G DK board

patrick murphy
Intellectual 640 points
Other Parts Discussed in Thread: SEGGER

Hello,

   I have  a J-link that Id like to use on a DK-TM4C123G. The board has the "standard" JTAG connector( 2x5  .050" shrouded header) J1 on schematic.

segger offers this

J-Link 9-pin Cortex-M Adapter

The J-Link 9-pin Cortex-M Adapter allows JTAG, SWD and SWO connections between J-Link and Cortex-M based target hardware systems. It adapts from the 20-pin 0.1'' JTAG connector to a 9-pin 0.05'' Samtec FTSH connector as defined by ARM.

The J-Link 9-pin Cortex-M Adapter may also be used to connect J-Link to a non Cortex-M target as far as the target connector uses the same pinout as shown below.

By default, TRST is not connected, but the Cortex-M Adapter comes with a solder bridge (NR1) which allows TRST to be connected to pin 9 of the Cortex-M adapter.

looks like it will do the job but pin 3 is grounded on the adapter and on the board it is labeled as EXTDBG. 

Is it safe to assume that this low/gnd signal disables U9 and keeps it from interfering with an external programmer/debugger?

 

  • 0
    TI__Guru**** 244410 points
    Hello Patrick

    From DK-TM4C123G User Guide

    "When connecting an external debugger, pin 3 of the JTAG header must be tied to ground in order for the ICDI to release control of the JTAG signals"

    So looks like it should work. To be double sure, when you power up the board w/o the external debugger, check if the Pin-3 on the header is 3.3V using a voltmeter. If yes, then it should work.

    Regards
    Amit