J-Link / J-Trace User Guide (UM08001) - Microcontrollers

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188 CHAPTER 9 Background information Exit1-DR Temporary controller state. Pause-DR The shifting of the test data register between TDI and TDO is temporarily halted. Exit2-DR Temporary controller state. Allows to either go back into Shift-DR state or go on to Update-DR. Update-DR Data contained in the currently selected data register is loaded into a latched parallel output (for registers that have such a latch). The parallel latch prevents changes at the parallel output of these registers from occurring during the shifting process. Capture-IR Instructions may be loaded in parallel into the instruction register. Shift-IR The instruction register shifts the values in the instruction register towards TDO with each clock. Exit1-IR Temporary controller state. Pause-IR Wait state that temporarily halts the instruction shifting. Exit2-IR Temporary controller state. Allows to either go back into Shift-IR state or go on to Update-IR. Update-IR The values contained in the instruction register are loaded into a latched parallel output from the shift-register path. Once latched, this new instruction becomes the current one. The parallel latch prevents changes at the parallel output of the instruction register from occurring during the shifting process. J-Link / J-Trace (UM08001) © 2004-2010 SEGGER Microcontroller GmbH & Co. KG
9.2 Embedded Trace Macrocell (ETM) Embedded Trace Macrocell (ETM) provides comprehensive debug and trace facilities for ARM processors. ETM allows to capture information on the processor's state without affecting the processor's performance. The trace information is exported immediately after it has been captured, through a special trace port. Microcontrollers that include an ETM allow detailed program execution to be recorded and saved in real time. This information can be used to analyze program flow and execution time, perform profiling and locate software bugs that are otherwise very hard to locate. A typical situation in which code trace is extremely valuable, is to find out how and why a "program crash" occurred in case of a runaway program count. A debugger provides the user interface to J-Trace and the stored trace data. The debugger enables all the ETM facilities and displays the trace information that has been captured. J-Trace is seamlessly integrated into the IAR Embedded Workbench® IDE. The advanced trace debugging features can be used with the IAR C-SPY debugger. 9.2.1 Trigger condition The ETM can be configured in software to store trace information only after a specific sequence of conditions. When the trigger condition occurs the trace capture stops after a programmable period. 9.2.2 Code tracing and data tracing Code trace Code tracing means that the processor outputs trace data which contain information about the instructions that have been executed at last. Data trace Data tracing means that the processor outputs trace data about memory accesses (read / write access to which address and which data has been read / stored). In general, J-Trace supports data tracing, but it depends on the debugger if this option is available or not. Note that when using data trace, the amount of trace data to be captured rises enormously. 9.2.3 J-Trace integration example - IAR EWARM In the following a sample integration of J-Trace and the trace functionality on the debugger side is shown. The sample is based on IAR’s EWARM integration of J-Trace. J-Link / J-Trace (UM08001) © 2004-2010 SEGGER Microcontroller GmbH & Co. KG 189
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J-Link / J-Trace ARM User guide of
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Revision Date By Explanation 86 100
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About this document This document d
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11 Table of Contents 1 Introduction
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5.5 Multi-core debugging ..........
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10.2.1 Rules for series terminators
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Chapter 1 Introduction This chapter
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1.2 Supported OS J-Link/J-Trace can
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1.3.1 Model comparison The followin
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LOW level input voltage (V IL ) V I
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1.3.3 J-Link Ultra J-Link Ultra is
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• Serial Wire Viewer supported
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1.3.6 J-Trace ARM J-Trace is a JTAG
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1.3.7 J-Trace for Cortex-M3 J-Trace
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1.3.8 Flasher ARM Flasher ARM is a
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1.4 Common features of the J-Link p
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1.6 Supported IDEs J-Link / J-Trace
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Chapter 2 Licensing This chapter de
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2.2 Software components requiring a
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2.3.3 Device-based license The devi
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2.4 Legal use of SEGGER J-Link soft
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2.5.3 J-Link Pro J-Link Pro is a JT
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2.6 J-Link OEM versions There are s
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2.6.6 IAR: J-Trace IAR J-Trace is a
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2.8 Illegal Clones Clones are copie
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Chapter 3 Setup This chapter descri
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2. The Welcome dialog box is opened
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3.2 Setting up the USB interface Af
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3.3 Uninstalling the J-Link USB dri
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3.4.1.2 Connecting via Ethernet onl
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3.4.2.2 Configuring J-Link via web
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3.5.2 Using the J-Link configurator
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Chapter 4 J-Link and J-Trace relate
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4.1.2 List of additional software p
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4.2.2 SWO Analyzer SWO Analyzer (SW
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4.2.4 J-Link STM32 Commander (Comma
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4.2.6 J-Mem Memory Viewer J-Mem dis
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4.2.8 J-Link RDI (Remote Debug Inte
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4.3 Dedicated flash programming uti
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4.3.5.2 Purchasing the source code
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4.5 Using the J-LinkARM.dll 4.5.1 W
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Chapter 5 Working with J-Link and J
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5.2 Indicators J-Link uses indicato
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5.2.2 Input indicator Some newer J-
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SEGGER J-Flash configuration dialog
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5.3.3 Determining values for scan c
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5.4 SWD interface The J-Link suppor
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5.5 Multi-core debugging J-Link / J
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6. Choose Project|Options and confi
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5.6 Connecting multiple J-Links / J
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5.6.3 Connecting to a J-Link / J-Tr
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5.7.1.2 Settings In the Settings se
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5.7.1.3 Break/Watch In the Break/Wa
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5.7.1.7 SWV In this section SWV inf
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5.8.1.4 Type 3: No reset No reset i
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5.8.2.6 Type 5: Reset core & periph
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5.10 J-Link script files In some si
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Prototype __api__ int JTAG_WriteIR(
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Note: All global variables are trea
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• ARM1176JFS • CORTEX_M0 • CO
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5.11 Command strings The behavior o
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Syntax map exclude - Example This i
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Syntax SetCheckModeAfterRead = 0 |
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5.11.2 Using command strings 5.11.2
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5.12 Switching off CPU clock during
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Chapter 6 Flash download and flash
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Page 173 and 174: Pins 4, 6, 8, 10, 12, 14, 16, 18, 2
Page 175 and 176: PIN SIGNAL TYPE Description 15 RESE
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Page 179 and 180: PIN SIGNAL Description 22 Trace sig
Page 181 and 182: Parameter Min. Max. Explanation Tsh
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Page 201 and 202: 10.2 Terminating the trace signal T
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Page 205 and 206: 11.2 Troubleshooting 11.2.1 General
Page 207 and 208: 11.3 Signal analysis The following
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Page 211 and 212: Chapter 12 Glossary This chapter de
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Page 217 and 218: Chapter 13 Literature and reference
Page 219 and 220: A Adaptive clocking ...............
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