Lauterbach AVR8 Manuale utente

MANUAL

Release 02.2022

AVR8 Debugger

AVR8 Debugger | 2

AVR8 Debugger

TRACE32 Online Help

TRACE32 Directory

TRACE32 Index

TRACE32 Documents ...................................................................................................................... 

ICD In-Circuit Debugger ................................................................................................................ 

Processor Architecture Manuals .............................................................................................. 

AVR8 ......................................................................................................................................... 

AVR8 Debugger .................................................................................................................... 1

History ................................................................................................................................ 4

Warning .............................................................................................................................. 5

Introduction ....................................................................................................................... 6

Brief Overview of Documents for New Users 6

Demo and Start-up Scripts 7

Configuration ..................................................................................................................... 8

System Overview 8

Quick Start ......................................................................................................................... 9

Troubleshooting ................................................................................................................ 11

FAQ ..................................................................................................................................... 12

AVR Specific Implementations ........................................................................................ 13

Breakpoints 13

Software Breakpoints 13

On-chip Breakpoints for Instructions 13

On-chip Breakpoints for Data 13

Overwriting Fuse and Lock Bits 13

Memory Classes 14

Programming the On-chip FLASH of the megaAVR 15

Special Hints, Restrictions, and Known Problems 15

Restrictions 15

Known Problems 15

CPU specific SYStem Settings ......................................................................................... 16

SYStem.CONFIG.state Display target configuration 16

SYStem.CONFIG Configure debugger according to target topology 17

SYStem.CONFIG.DEBUGPORTTYPE Select debug port type 20

SYStem.CPU Select the used CPU 21

AVR8 Debugger | 3

SYStem.JtagClock Define JTAG clock 22

SYStem.LOCK Lock and tristate the debug port 22

SYStem.MemAccess Real-time memory access (non-intrusive) 23

SYStem.Mode Establish the communication with the target 24

SYStem.Option.IMASKASM Disable interrupts while single stepping 24

SYStem.Option.IMASKHLL Disable interrupts while HLL single stepping 25

CPU specific TrOnchip Commands .................................................................................26

TrOnchip.state Display on-chip trigger window 26

TrOnchip.CONVert Adjust range breakpoint in on-chip resource 26

TrOnchip.VarCONVert Adjust complex breakpoint in on-chip resource 27

TrOnchip.RESet Set on-chip trigger to default state 27

Connectors ........................................................................................................................ 28

Debug Connector 28

Mechanical Description of the 10-pin Debug Cable 28

Converter 10-pin JTAG to 6-pin SPI for AVR8 28

Converter 10-pin JTAG to 6-pin UPDI for AVR8 29

Converter 10-pin JTAG to 8-pin UPDI for AVR8 29

AVR8 Debugger | 4

AVR8 Debugger

Version 09-Mar-2022

History

30-Sep-20 Added descriptions for the commands SYStem.LOCK and SYStem.MemAccess

StopAndGo.

AVR8 Debugger | 5

Warning

WARNING: To prevent debugger and target from damage it is recommended to connect or

disconnect the debug cable only while the target power is OFF.

Recommendation for the software start:

1. Disconnect the debug cable from the target while the target power is

off.

2. Connect the host system, the TRACE32 hardware and the debug

cable.

3. Power ON the TRACE32 hardware.

4. Start the TRACE32 software to load the debugger firmware.

5. Connect the debug cable to the target.

6. Switch the target power ON.

7. Configure your debugger e.g. via a start-up script.

Power down:

1. Switch off the target power.

2. Disconnect the debug cable from the target.

3. Close the TRACE32 software.

4. Power OFF the TRACE32 hardware.

AVR8 Debugger | 6

Introduction

This manual serves as a guideline for debugging AVR8 cores and describes all processor-specific

TRACE32 settings and features.

Please keep in mind that only the Processor Architecture Manual (the document you are reading at the

moment) is CPU specific, while all other parts of the online help are generic for all CPUs supported by

Lauterbach. So if there are questions related to the CPU, the Processor Architecture Manual should be your

first choice.

Brief Overview of Documents for New Users

Architecture-independent information:

•“Training - Debugger Basics” (training_debugger.pdf): Get familiar with the basic features of a

TRACE32 debugger.

•“T32Start” (app_t32start.pdf): T32Start assists you in starting TRACE32 PowerView instances

for different configurations of the debugger. T32Start is only available for Windows.

•“General Commands” (general_ref_<x>.pdf): Alphabetic list of debug commands.

Architecture-specific information:

•“Processor Architecture Manuals”: These manuals describe commands that are specific for the

processor architecture supported by your debug cable. To access the manual for your processor

architecture, proceed as follows:

- Choose Help menu > Processor Architecture Manual.

• To get started with the most important manuals, use the Welcome to TRACE32! dialog

(WELCOME.view):

AVR8 Debugger | 7

Demo and Start-up Scripts

To search for PRACTICE scripts, do one of the following in TRACE32 PowerView:

• Type at the command line: WELCOME.SCRIPTS

• or choose File menu > Search for Script.

You can now search the demo folder and its subdirectories for PRACTICE start-up scripts

(*.cmm) and other demo software:

You can also inspect the demo folder manually in the system directory of TRACE32.

The ~~/demo/avr8/ folder contains:

compiler/ Hardware independent compiler examples.

flash/ Binaries for target based programming and example declarations

for internal flash.

AVR8 Debugger | 8

Configuration

System Overview

Example configuration for an AVR8 debugger.



POWER DEBUG USB INTERFACE / USB 3

POWER DEBUG INTERFACE / USB 3

PC or

Workstation

USB

Cable

Target

Debug

Connector

Debug Cable

AVR8 Debugger | 9

Quick Start

Starting up the debugger is done as follows:

1. Select the device prompt B (BDM debugger) and reset TRACE32.

The device prompt B:: is normally already selected in the TRACE32 command line. If this is not the

case, enter B:: to set the correct device prompt. The RESet command is only necessary if you do

not start directly after booting the TRACE32 development tool.

2. Set your connection type.

This command selects one of the two possible connections: JTAG or SPI.

3. Specify the CPU specific settings.

This command selects the CPU type.

4. Inform the debugger about the cashable address range (FLASH/EEPROM).

This is important to speed up the TRACE32 PowerView GUI responsiveness. The specified address

range will be accessed only once after a break, thus avoiding unnecessary memory accesses.

5. Reset the target and enter debug mode.

This command resets the CPU on the target, enables On-Chip-Debug Mode and issues a breakpoint

right after the reset interrupt routine.The CPU stops executing any instruction, and the user is able to

download and test the code. After this command is executed, it is possible to access memory and

registers.

B::

RESet

SYStem.CONFIG.DEBUGPORTTYPE JTAG|SPI|UPDI

SYStem.CPU ATMEGA1280

NOTE: For a multicore target it is most likely necessary to configure the multicore

settings using SYStem.CONFIG before continuing.

MAP.UpdateOnce p:0x8000--0xffff

SYStem.Mode Up

AVR8 Debugger | 10

6. Load the program into the flash..

A typical start sequence of the AVR8 is shown below. This sequence can be written to a PRACTICE script

file (*.cmm, ASCII format) and executed with the command DO <file>.

*) These commands open windows on the screen. The window position can be specified with the WinPOS

command.

DO ~~/demo/avr8/flash/atmegaxxx.cmm

B:: ; Select the ICD device prompt

RESet ; Reset the TRACE32 software

SYStem.CONFIG.DEBUGPORTTYPE

JTAG

; Select the connection type JTAG or SPI

or UPDI

MAP.UpdateOnce p:0x80000--

0xfffff

; Specify the address range for caching

WinCLEAR ; Clear all windows

SYStem.Up ; Reset the target and enter debug mode

~~/demo/avr8/flash/atmegaxxx.

cmm

; Load the target application

; Set the stack pointer to address 8000

PER.view ; Show clearly arranged peripherals

; in window *)

List.Mix ; Open source code window *)

Frame.view /Locals /Caller ; Open the stack frame with

; local variables *)

Var.Watch %SpotLight flags ast ; Open watch window for variables *)

Break.Set 0x1000 /Program ; Set software breakpoint to address

; 1000 (address 1000 is within RAM

; address range)

Break.Set 0x101000 /Program ; Set on-chip breakpoint

; to address 101000 (address 101000 is

; within Flash address range)

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