Auxiliary Target Control; Swo Trace Capture; Etb Trace Support; Led Operation - Texas Instruments XDS110 User Manual

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The power supply to the target is turned on when a debug or EnergyTrace session is started, and turned
off when the session terminates.
3.2

Auxiliary Target Control

There are additional interfaces between the probe and target that are mapped to GPIO signals on both the
CTI-20 and AUX cable. A typical use case for these signals is to drive GPIO inputs to the target to control
boot modes. Currently, the state of these signals can be set through the dbgjtag utility (see
Section 3.7.3.3).
3.3

SWO Trace Capture

The XDS110 probe supports ARM
devices. SWO trace is a single-pin trace interface that can be used for profiling hardware events such as
program counter, data reads/writes, and interrupt entry and exit, as well as application-initiated software
messages. When the XDS110 probe is supporting debug communication through 2-pin protocols such as
ARM SWD (2-pins) or 2-pin cJTAG, the target may reuse the TDO pin for SWO trace output. Currently,
only UART format is supported for transport of SWO data from target to host.
For more details on how to use SWO trace in Code Composer Studio and the devices supported, refer the
documentation at the following link: http://processors.wiki.ti.com/index.php/SWO_Trace.
3.4

ETB Trace Support

The XDS110 probe supports exporting trace data stored in on-chip buffers called ETB (embedded trace
buffer). The trace data captured in the ETB is device or trace component-specific. For more details on
using the ETB, refer the documentation at the following link:
http://www.ti.com/lit/ug/spruhm7b/spruhm7b.pdf
3.5

LED Operation

The XDS110 probe supports two LEDs to provide feedback on the operating state to the user.
maps LED functionality to probe operational states.
Green LED
Off
On
On
On
3.6

Energy Trace

3.6.1 Introduction
The XDS110 debug probe has on-board circuitry that can be used for measuring the target's energy
consumption. The hardware circuitry provides high-accuracy energy consumption with low bandwidth
current and power profile. The energy profiling range covers 1-µA to 100-mA current draw, above which
the tool will display an overcurrent message and shutdown. This tool is ideal for characterizing energy
consumption, but not for capturing short current spikes, because sampling occurs over large time windows
(~500 µsec).
SPRUI94 – January 2017
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Figure 5. Probe-Supplied Power and Voltage Level
SWO (serial wire output) trace for TI's single-core MCU and WCS
®
Table 3. LEDs and Probe Operational States
Red LED Probe Status
Off Probe is not powered, booting, or in Flashing mode
Off Probe is operating normally but no active debug connection
On Probe is operating normally and there is an active debug connection
Rapid Flash Debug transactions are being processed
Copyright © 2017, Texas Instruments Incorporated
Functional Description and Operation
Table 3
XDS110 Debug Probe
13