Connecting to a JTAG target

When connecting to a Cortex-M part, by default, the debugger will attempt to connect using SWD. If you need to connect via JTAG, then you must make a debugger configuration change as follows:

• Select your project in Project Explorer

• Right-click and select Launch Configurations->Open Current Launch Configuration

• In the dialog, ensure your projects Debug configuration is selected
• Select the Debugger tab

• in the table under Script Values, scroll the list and select the option Debug interface

• Select "JTAG" from the drop-down list
• Press Apply and then Debug

The debugger will now connect using JTAG instead of SWD.

The first time that you connect to a target over JTAG, a pop up dialog will appear for you to select which device on the JTAG scan chain to connect to. For more details see the FAQ "Multiple devices on a JTAG scan chain.

Note

Some Cortex-M based MCU's only support debugging via SWD, and not via JTAG. Please check the documentation for the MCU that you are using for more information.