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If all you need is a quick serial communications implementation for your project, Program81 (from the microEngineeringLabs Web site) gives all the code you needto reaaland write to the USART Combine the single charactercode in a loop to read and wdte more than one character(in other words, createstrings) W wilh (Program communicate a computer) to RS232 Communications ; rhis microBnsineeriner Labs proqran can be found on theif, web ; site use the fales! version CLE,AR , read and wrile hardware usart
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DEFINE OSC 4 i 81 vaR BYIE ; BRIsc = b10111111 ; sPaRG = 25 , RcsIA = g1OO1OOO0 i Txstr = %OO1OOOO0 ; osc speed initialize usart sec Tx (PoRTc6) to ou!, re6! in set baud rale to 2400 _"i eaable serr l po - and cor LinLous and asvnchxonous mode enable transnit characlers in innnite if
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input, fxon serial SOSI'B CEARIN ; ge! a characler yet IF 81 : O TEEI I'OP; no character ouLput lo serial send characrer GOSDB CEAROIIT
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lrol usar re ^,/e! slro ro goL preseL to no character received l F P I R 1 5 = 1 E E E N , lf receive flas then char:acler co b1 81 = RCREG i set received ENDIF i (ContinwA t3l
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(Programcommunicale a computed with lo Communications l::Ptdiiallig-ili: Rs232 lcontinued)
RETI'RN CHAROu!: IF PIR11T = O THEAI CITAROu ! TXREG = Bl REAURN EIID
qo back Lo calLer to send a character subroutine to usarl Lransnilter registe! enpty wait for transnit send characLer io transnit go back to caLLer
of understanding whatis goingon, readon On the otherhand,jfyou needa greatcr ofserialco municationsTheboard with twotypes TheLAB-XIlelsus experiment thatcanbe standard boardandan emplysocket on with hardware the RS232 for comes Only onetype of with the RS485protocol(a linedriverlC muslbe ndded) coniigured can communications be actve at anyonetime,andlhcchip ihatis not beingusedmust communicalions routedto theDB 9 female are from theboard The RS232 beremoved at conneclor the boa]d,mdtherearePC boa]dholesfot sthree'pinconnector Jl0 on or is The IC rcquired theRS485 the SN175176A equivby &rRS,l85 communications alentline driver using RS485allows you io go are The two staDdards simil and,simply stated, io is and longerdistances the communicaiion morenoisetolerart(This is related the of The discussion driversbeingemployed capacitance the lines usedand slronger of of the why andhow ofthis is beyondthe scope this book) and the specifiedcompiier The compiler suppots communicationsto both standards lbr usedwheneverpossjbleWriting your own sequences controlconmrmds shouldbe eventhoughit might be inslructive is ling serialcommunications couDterproductive, you and to bothstandards, the hardware the commands access The compiieruses same put in placedetermines are how the signaLs senlo!r! andreceived(Takea minute to look at Figures8- l and 8-2 to seewhat the complicationsarJ) of to Coimunicationsarc timed according the speciiication the oscillator For the has propertiming to be achieved, OSC command to be sct to the actualoscillator the will be spedup conmunications are frequency useIfthe ffequercies not matched, in (in spced) on theextent ofthe mismatchIlyouareactudly using down based or slowed will ihe a 4 M Hz oscillatorandspecifyOSC20 in yourprogram, communications slot! at the is spccd because system actuallyrunning one-fifth downto onlr fifth thespecified the 20 MHz speed In order to experimentwith colnmunications,we needto bc able to communicatewith computcr up with a dumb set to The an externaldevice easiestdevice useis apersonal all Thevariousversions MicrosoftOfficeWorkssoftware contaln of terminalprogram you canaccess use program and that a tefminal instructions: Adumb terminalmay be setup by following these lrough,thenselect menuin your PC command Co to the St u]t
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Communications HyperTermi nal Iffbr somereasonHypelTerminal doesnot show up here,go to IIELP underthe Stat nenu, searchfbr "HyperTeminal," andthenclick "Finding in 2000" This will give you a window with a link to HyperTerminal Downloads are free Set up the HyperTerminal for 8 bits No parity I stopbit 2400ba d This is whatthe system defaults w]lh the PICBASICPROCompiler We will use to thesesettings all our experiments it up andsaveyour terminalto the desktop for Sct tor easyaccess Connectthe serial cable betweenthe computerand the MCU Since this salnecable is alsousedfbr programming MCU, if you haveonly oneserialpot, you mustdisthe connect from the serialprogrammer it aftereveryprogramming session whenusinga programmer It'sjust one morereason optingtbr the USB programmer serial lor The wiring for the connector the serialport is shownin Figurc81 to
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