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IOGGII{G DATA FROI A SOLAF COLIECIOR
In Program 228, the data is storedon disk in hexadecimalformat If you want it in decimal fomat, you have 1oread it into a program variable and then convert it to the desiredfomat As provided (in the compiler), the SEROUT insluction offers a limited choice for the datatransfer as it was read in from the clock nole Therc is a certain amount of nonyolatile nemory on the PIC 16F877Athat couu halje beenutilized to storcpo rerfailurc infomqtionforfuture anallsis- Howew4 becausethere is no prcvision that alloyrs us to rcset the clock accurately,the useof this memory cannotpro|ide a norc pet;lct solution
PROBI-EM!
When this program was sent ro Dr Sun, one of his studentscomplained thal the pro$am was not completely coflect Can you lind what he or shethinks the problem is The answeris provided at the end of the supportWeb site
DEBUGGING
General
It takes a long time to becomea good debugger It hastaken me forcvet, and I am still leaming and still not very good at it The ploblem is that you must have a good understandilg of the PIC you are using and come up with a solid designThough this may seempretty straightforward,it isn't, especiallyif you areusing a new PIC andrhe PIC 16F877Awe discussing new to mostofus are is In plain English, this meansthat I really do not know how to tell you to becomea good debugger Evenso,I needto give you someguidance help you, so I haveput to down everythingthat cameto mind asI wasdebuggilg the variousprojectsin this book In theseparagraphs,I have allowed myself somerepetition uDderthe vadous headings so they can each standalone At the end of the chapter,I have included somequestionsand answofi that werc the result of somediscussionson the Web site for anotherDroiectbut that are also relevant to any discussionabout the 16F877APIC
Debugging Troubleshooting and
Debugging is not a random processduring which one mighl hope to get lucky It is a very carcfully thought out stratregy find out why a program is not behavingthe way to it wasintended andwhatneeds be doneto conecttheqoblemYourri havefued to to the problen only if yolt can make the problem come back b! undoing theft A \agte suspicionthat you might have fixed the problem by pressingon a warm componentis not enoughto concludethat lhe prcblem hasactually be nsolved You must be able to makethe problem comeback This is exacdy the reasonwhy intermittent prcblems are so hard to nx lt's had io make them come and go on commandIn other words, it is harder to clearly understandthe problem becauseit is htermittent
DEBUGGING
First Problemthat Must Be Fixed: The Microcontroller CrystalMust Oscillate
so lfthe PIC oscillatorwill not oscillate, nothingcanbe doneto fix anything, the lirst The easiest way thing we mustdo is makesurethe OSClinesareactuallyoscillating with an oscilloscope thereare probiems following pointsare If thc to checkthis is
should also l Remember thc LAB'X I runsat 4 MHz out of the boxYour system that you bedesignedto at4 MHz soyou canusetheLAB-XI asa teslbedwhcnever run need toThis allowsyou to takethePIC backandforth betweeryourprojectandthe LAB-XI to seewherethe problems areThisjs nor atrivial tool that we haveat our casual disposal 2 To startwith, do all your projectswith a 4 MHz crystalLrter, you can move to to a 20 MHzIt is easyenough replace crystalon a board in doesnot match DEFINEOSCstatcment yourpfogram, the 3, If thecrystal frequency you thereca will be problemslfyou are usinga crystalor rcsonator mustknow muststate thisnumberin lhe whatthe frequency thedeviccis andyour software of They mustmatch at accuratelyOSC statement the top of the program 4 The Configuration dnd Option pulldown menusin the programmermust match tbe in dnd actualconditions the hardware theymustmatcheachother
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