Tracing on Atmel ATSAME70

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This article describes how to get started with trace on the ATMEL ATSAME70 MCU. This article assumes that there is already a basic knowledge about trace in general (what is trace, what different implementations of trace are there, etc.). If this is not the case, we recommend to read Trace chapter in the J-Link User Manual (UM08001). The ATMEL ATSAME70 MCU implements tracing via pins, so a J-Trace can be used for tracing.

Minimum requirements

In order to use trace on the ATMEL ATSAME70 devices, the following minimum requirements have to be met:

  • J-Link software version V6.22d or later
  • Ozone V2.54b or later (if streaming trace and / or the sample project from below shall be used)
  • J-Trace PRO for Cortex-M HW version V1.0 or later

Sample project

Streaming trace

The following sample project is designed to be used with J-Trace PRO and Ozone to demonstrate streaming trace. The project has been tested with the minimum requirements mentioned above and a Smart SAME70 Xplained evalboard. The sample project comes with a pre-configured project file for Ozone that runs out-of-the box. In order to rebuild the sample project, SEGGER Embedded Studio can be used.

Atmel_ATSAME70_75MHz_Trace.zip

Note: The example is shipped with a compiled .JLinkScriptfile, should you need the original source it can be requested at support@segger.com

To create your own .JLinkScriptfile you can use the following project as reference: Tracing on SEGGER_Cortex-M_Trace_Reference_Board

Specifics/Limitations

The Smart SAME70 Xplained evalboard is sharing its ETM port with the on board Ethernet controller. This leads to interference on the trace signals. Ethernet and ETM Trace can't be used at the same time with this eval board. Additionally the ATSAME70Q21 MCU used in this example has two watchdogs running from reset which need to be either disabled or fed regularly.

Tested Hardware

Smart SAME70 Xplained