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I Makesurethe microcontroller power has Make sureit is 5 volts on the money as Make surethereis powerto both sjdesof the microcontroller, is rcquiredon a largerumber of then MaIe suregroundis a solid groundat all pointsin the circuitry ff the $ound is squirrelly,this is not goodFix it 2, Make surethe MCLR pin hasbeer pulledup to 5 volts with a lK to loK resistor you areusingMake surethe MCLR pin is actuThis valuedepends thedesign on if fansientoperation ally highPut a meteron it Usean oscilloscope you suspect Make sulethe operation 3 Make surelhe oscillaloris runring Use an oscilloscope joints Use a mag4 Use your eyesto checkthe PC boardfor shortsanddry solder glassin diificult areas over questionable areaswith a soldeing iron again nifying Co your work andrecheck 5 Male surethe wirins is what you thinl it is Checktherouteof everywire MaIk it oiT as on the schematic you checkit Checkthe PC boardlracc roulingswherenec ssary on 6, Checkandconfrm the values eachof the components theboard of
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iilUST OSCIILATE lHAl MUSI gE FIXED:tHE MICiOCO|{TBOLIEBCRYSTAL FIRSI PROBLEiII
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with pin 1 in the properlocationin its socket 7 Make sureeachIC is oriented power and ground to eachIC are properly routed and are aclually at the 8 Make sule rnstruments to values they are supposed be with appmpnate 9 Measurevoltagesthroughou!thc layout andconfirm they arewhat lhey aresupposecl coffectly Checkpolaritywherenecessary are loMake sureall capacjtors installed All colrectly of lhem don't alwaysneedto be I lMake sureall diodesare installed installed so lhe cathodeis connectedto gro nd Coniinn connectionson alj induc tive loads t 2 Make sule all inductive (back electro motive force [EMF]) loads areproperly pro tected against with diodes Make sure thesc djodes are properly rated for amperage,voltageandswitchingspeed small lo l3Use theoscilloscope checklbr noisein thecircuitry'Eliminalejl by adding capacitorsto grcund at the noisy arcas (on I 4 Readthe relevant chapterof the datashcet siarlup) again Make sureyou under is standwhat the datasheet saying I 5 Make surethe processorhas not been destroyed,Sometimesolre or more lines on untt Try variousportscanbe desfioyed a replacement
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SIDE CHECKSOI{ THE SOFTWARE MAKE THE FOLLOWING
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l Go over the soft\,i'areline by line and m,!ke sure there are no typos Not all typirg by mistatesareidentified the compilersoftware 2 Write a sho LED blinl routine and run that on the board to make sure the system add loopsaspafi ofits design, a blinkalive andworkinglf theprogram is actually as for ing jnstruction oneof the LEDSto tell you thal the loop is acluallyexecutjng or andnot hanging p on someothersegrnent code designed as 3 Use Microcode Studioto seewhat is gojngon in the system it is run The soil_ use$ andwill run the I 6F877A wareis liee to downloadoff theIntemetlor individual Details on using this soflwate are beyond the scopeof this book and arenot covered herebut it's worth the efib to learnthis software step,yolr can setup your PC as a dumb tcrminalandconnectit 4 For lhe preceding with the appropriate to the boardso the entiresystemcanbe viewedon the screen 5 Go over the software to make suretherc are no logical errors 6 Follow thc useof eachvariable throughout the program to make sureit doesnot get modified where it should not integer mathand8- and 16-bit variablcsMake we 7 The software areusingemploys surethat none of the vtriables exceedthe boundsthat havc been designatedby the ovcrllow or when registers what happens variablesizesBe sureyou understand in in integermathYou cannolusedecimalpointsat mostlocations inteunderflow precautioN you takespecial ger mathunless again stat up" chapter(Chapler14) of the datasheet 8 Readthe "microprocessor is what the datasheei siyrng Make sureyou understand
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There are a number of ways to get input into andfeedbdck out ftom a n^lfu'ncti'on' irg program Using as many as possible will reduce the number oi times you have to reload the programYou have the following feedbackdevicesavajlableto you of what you needhto criticalareas the program IncoDorate l 2 3 4 5 The LCD use both line I and line 2, and useeachcharacteron eachline The speaker it's simple to sel up two tonesthat are easyto differentiate The dumb terminal program for a PC can display a large amount of infomalion Use the various buttons to modify what is happeningin the program in real time Use the tlrce onboardpotentiometersto input various valuesinto the pfogram and seehow they modify its operation 6 Il more is needed,add LEDS to the hadware so you can tum tbem on and off at c ticaljunctures Use the DEBUG conmand in PBPto sendinformation to a dumb teminal The use See in is of this command explained detailin the PBPmanual the lbllowing also
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You caninsert a shoft loop that displaysthe registersyou are interestedin at a critical location in the program When the proglam entersthis loop, it indicates that the program actually got this far and then it displays the rcgjslers of intercst again and again without going any further This loop can be moved up anddown through lhe progrrmlo ree\ ha(i\ goingon $hefe 8 Determine if the program is actually getting to a certain critical line of code9 Determine what the contentsof various registersare at critical times h the code I o Look at how countersare behavingto confirm that this is exactly what is supposed to be happening I I Display databasedoo i nteffupts progranmed and/or enteredby you from the keys 12, Look for areaswhere the program night be getting stuck in a loop 13, Pay special attention to the handling of interrupts I 4 Go over the circuit layout to make suretherc are no mistakesin the design of the cllcuny I 5 Go over the physical circuit to makesureit is actuallywired the way it was designed l6,Make sureall lines that are to be pulledup or down arc actuallybeingpulledup and down and that the resistorsbeing used are of the right values
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