Chap 14Lesson03EmsysNewLabTools

7/28/2019 Chap 14Lesson03EmsysNewLabTools

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2008 Chapter-14L03: "Embedded Systems - Architecture,Programming and Design" , Raj Kamal, Publs.: McGraw-Hill,

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Testing, Simulation and DebuggingTesting, Simulation and Debugging

Techniques and Tools :Techniques and Tools :

Lesson-3

Laboratory Tools


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1. Hardware Diagnostic Laboratory Tools1. Hardware Diagnostic Laboratory Tools


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Hardware Diagnostic Laboratory ToolsHardware Diagnostic Laboratory Tools

Volt-Ohm meteruseful for checking the

power supply voltage at source andvoltage levels at chips power input pins,

and port pins initial at start and final

voltage levels after the software run,

checking broken connections, improper

ground connections, and burnout

resistances and diodes.


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LED testuseful for testing port

outputs and when using portconditions 1 or 0 for debugging a

particular set of conditions


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Logic Probe

Oscilloscope

Logic Analyser

Bit Rate meter

ICE

System Monitor Codes


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2.2.

Use of Logic ProbeUse of Logic Probe


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Use of Logic ProbeUse of Logic Probe

Simplest hardware test device.

Handheld pen like device with LEDs Glows green for 1 and red for 0

Important tool when studying the long

port-delay effects (>1s). Delay program tests the presence of

system clock ticks


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3.3.Use of OscilloscopeUse of Oscilloscope


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Uses of OscilloscopeUses of Oscilloscope

Screen to display two signal voltagesas a function of time

Displays analog as well as digitalsignals as a function of time

Noise detection tool

Mal-function detection of a suddentransitions between '0' and '1' states

during a period.


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4.4.Use of Logic AnalyzerUse of Logic Analyzer


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Uses of Logic AnalyserUses of Logic Analyser A powerful hardware tool for

checking multiple lines carrying

address, data and control bits, IObuses, ports, peripherals and clock.

Recognizes only discrete voltageconditions, '1' and '0'.


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2008Chapter-14L03: "Embedded Systems - Architecture,

Programming and Design" , Raj Kamal, Publs.: McGraw-Hill,

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Logic Analyser Logic Analyser Collects, stores and tracks multiple

signals and bus transactions

simultaneously and successively.

Reads multiple input lines (24 or 48) and

later displays, using this tool, eachtransaction on each of these on computer

monitor (screen) observed


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Logic Analyser Logic Analyser Also shows states on the horizontal

axis instead of time in its state mode

of display.

Displays the logic states of a

particular line as a function of 0 and1 on another line.

Catches intermittent bugs


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Logic Analyser Logic Analyser Does not help on a program halt due

to a bug. Does not show processor register and

memory contents, if the processor

uses caches then a bus examination

alone may not help.


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LogicLogic

AnalyserAnalyser

Cannot modify the memory contents

and input parameters and study theireffects [simulator needed as that

helps in studying these effects]


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Logic Analyzer two modes of functioningLogic Analyzer two modes of functioning

One modeto show time on x-axis,

and logic states of the clock signal, bussignals and other signals on y axis.

Second modeto give address, data

bus and other signal states from atrigger point to examine illegal op-codes, access in protected addressspace and other states as a function of areference state.


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5.5. Use of Bit rate meterUse of Bit rate meter


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Use of Bit rate meterUse of Bit rate meter A measuring device that finds

numbers of 1s and 0 in the pre-

selected time spans. Measures throughput.

can estimate bits 1s and 0s in atest message and then use bit ratemeter to find whether that matches

with the message.


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SummarySummary


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We learntWe learnt

Volt Ohm meter

LED

Logic probe

Oscilloscope used to test the fast changing

signals, their wave forms, overshoots andundershoots at transitions.


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We learntWe learnt

Logic analyser used to measure logic

states on many connections

simultaneously.

Bit rate meter to test by measuring number

of bit changes in given time span andexpected ones


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End of Lesson-3 of chapter 14 onLaboratory Tools

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