core timer code development how you could have done the take- home quiz using a test driven...

Core Timer Code Development

How you could have done the Take-Home Quiz using a test driven development (TDD) approach

04/18/23 TDD-Core Timer Library, Copyright M. Smith, ECE, University of Calgary, Canada

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To be tackled today

Test driven development example

Customer requirementsPossible system test provided by

customer’s FAE (field application engineer)Development of your unit tests


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Customer Requirements

Long term goal is that we will be using devices that need to be activated at certain reliable times. Seems like we need a library of timer functions


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Customer Test – example code

Put system into knownstate

We already have theseLED utilities (Lab. 2)

Here is the sort of thing we need

This sort of test detailmay indicate thatFAE has alreadytried and failed.

Be polite when youdeliver code


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Define the functions

To be coded in assembly code Convention when dealing with hardware

ulong SetCoreTimer(initial, reload, scale) Initializes the core timer registers, returns old control setting,

places timer in low power mode, stops the clock void StartCoreTimer(void), void StopCoreTimer(void)

Starts and stops the timer. When started the timer is to run continuously.

ulong ReadCoreTimer(void) Returns current value from the timer

bool CheckIfCoreTimerExpired(void) Determines whether or not the core timer registers have been

reloaded


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Step 1A – Get a main( ) and a test to compile and link – Design the test


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Step 1B – Get a main( ) and a test to compile and link – Design main

Bring a copy of your Take-Home Quiz code to compare


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Recode till pasts the test


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Step2A – Write the test for void StopCoreTimer(void);


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Step 2B – Write and Test void StopCoreTimerASM(void);



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Step 2C – Fix the test


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3A – Write a test -- unsigned long int ReadCoreTimer( )


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3B – Write the code to pass the test



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4 Write the Test for void StartCoreTimerASM(void)


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4 – Write the code to satisfy the test



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Test failed because


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4 Rewrite the test – prefer new -- unsigned long int StartCoreTimer(void)


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4 -- Need to add unsigned long int SetCoreTimer(ulong, ulong, ulong)


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Needed code – run the tests



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New tests pass – old tests now fail


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Fix StopCoreTimer( )


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Re-examine ReadCoreTimerASM


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4 – Re-examine Test


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Final Test


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Customer Test

Put system into knownstate

We already have theseLED utilities (Lab. 2)

Here is the sort of thing we need

This sort of test detailmay indicate thatFAE has alreadytried and failed.

Be polite when youdeliver code


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Oops -- Still missing code forbool CheckIfCoreTimerExpiredASM( )

First – write the test


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Oops - Still missing code forbool CheckIfCoreTimerExpiredASM( )

Now write the code


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Tackled today

Test driven development example

Customer requirements Possible system test provided by customer’s FAE

(field application engineer)

Development of your unit tests

You still need to design the test and the code for bool CheckIfCoreTimerExpiredASM(void);


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Information taken from Analog Devices On-line Manuals with permission http://www.analog.com/processors/resources/technicalLibrary/manuals/

Information furnished by Analog Devices is believed to be accurate and reliable. However, Analog Devices assumes no responsibility for its use or for any infringement of any patent other rights of any third party which may result from its use. No license is granted by implication or otherwise under any patent or patent right of Analog Devices. Copyright Analog Devices, Inc. All rights reserved.

core timer code development how you could have done the take- home quiz using a test driven...

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