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┐0МCaolan80 ,F        l222F4z ЖЧ@v╫XВЪVnv ┘TCP/IP Stack Intro Vi bruger ver. 2.20. af tcp/ip stacken, idet de senere udgaver ikke virker pх RTL8019. Hvordan er stakken opbygget? Beskriv main.c Hvorfor bruger vi network_* funktioner? Disse funktioner bruges af den embeddede til at sende data, hvis f.eks der skal regnes en total sum af de indtastede varer, sх bliver network_calc_total() kaldt, og sх s°rger den for at sende en request til serveren, som lyder pх at der skal regnes en total pris ud, og sendes tilbage til terminalen. Network funktionerne. Network funktionerne pakker afsendelsen og modtagelsen af data over rtl8019 kredsen ind for at g°re det meget nemmere for den embeddede del, at sende/modtage data. network_send_hello( unsigned char termid ) Her oprettes en forbindelse fra den embeddede til serveren, hvor den embeddede identificerer sig, samt et handels id bliver oprettet. network_send_scan frame( unsigned char antal, unsigned char buflen ) her sender vi en stregkode, som ligger i den globale variabel global_network_char, og lцngden af stregkoden ligger i global_network_int. Grunden til at vi skal bruge lцngden af stregkoden, er for at vi skal vide hvor lang strengen er, som vi skal sende, idet den kan variere fra 8 til 14 cifte. network_send_calc_total() nхr sх alle varerne er scannet ind, og der skal kvitteres, sх sender den embeddede en ordre til serveren, hvor den beder om at fх udregnet total prisen af de skannede varer, den igang vцrende handel. network_send_cash_payed( int amount ) umildbart efter network_send_calc_total er blevet sendt, sendes bel°bet som kunden betaler med, til serveren, for at fх regnet byttepengene ud, dette kunne godt g°res pх den embeddede, men siden vi skal f°re log over det, sх er det langt det nemmeste at udregne prisen pх serveren. network_send_cancel_last() I tilfцlde af at der bliver registreret en forkert vare, sх skal det vцre muligt for at fjerne den igen, hvilket denne funktion g°r. network_send_cancel_all() hvis en kunde f.eks. Fortryder en handel, sх s°rger denne funktion for at sende besked til serveren om dette. network_send_goodbye() Denne funktion afslutter handlen. ,|╓HМц╩┤╩┤+B*CJmH sH KHPJnH ^JaJ_H tH 7B*CJmH sH 65KHPJnH ^JaJ_H tH ]\1B*CJ mH sH 5KHPJnH ^JaJ _H tH \&╘,|╓J а м 6 Д ╕ HФ╚ц╤╧═╦╤╣╤╖вавЮвЬвЪ & F ╞Д^ДД]ДД`Д ╞ї Дї ^Дї Д]ДД`Д & F ╞Д^ДД]ДД`Д & F ╞Д^ДД]ДД`ДдЁдx╚■ >HМъшцъфъ▐ддx & F ╞Д^ДД]ДД`Д*░╨/ ░р=!░n"░n#Рn$Рn2P1Рh3P(20Root Entry         └FА CompObj    jOle         1Table            / SummaryInformation(     ,uWordDocument            ┼,DocumentSummaryInformation8            ,t            ■