| /programy/Atmel_C/RS232toRS485/P232.c |
|---|
| 2,18 → 2,23 |
| // Prevodnik RS232 <--> RS485 |
| // pri startbitu na RS232 zapne okamzite vysilac pokud nejsou detekovana data z RS485. |
| //---------------------------------------------------------------------------------- |
| //Program je urcen k rizeni toku dat v prevodniku RS232 na RS485. S cilem eliminovat jakekoliv prvky nastavovene uzivatelem |
| //bez nutnosti pouziti hardwaroveho rizeni toku. Program tedy dokaze detekovat prenosovou rychlost, paritni bit a stopbit. |
| // |
| // |
| //Algoritmus: |
| // Princip je zalozen na mereni nejkratsiho casoveho useku v osmi vzorcich, delka vzorku |
| // se odviji od velikosti prave nejmensiho zmereneho vzorku. |
| // delka vzorku se meri pomoci 8mi bitoveho casovace a interruptu od zmeny vstupu. casovac je osetren |
| // Vzorek se meri pomoci 8mi bitoveho casovace a interruptu od zmeny vstupu. casovac je osetren |
| // proti pretekani (pocet preteceni se uklada, do promenne s ktere se zpetne vypocita 16bitove cislo, |
| // casovac se tedy virtualne chova jako 16ti bitovy.) |
| // Mereni delky bitu |
| // |
| // Aktualni implementace teto metody se chova tak, ze pokud je vyslan bajt ktery po startbitu obsahuje N |
| // stejnych bitu, tak je tato sekvence detekovana jako jeden bit to zpusobi ze detekovana rychlost je N krat |
| // mensi, nez skutecna. Dusledkem je, ze pokud se jeste pred stopbitem neobjevi samostatny bit s jinou hodnotou, |
| // nez predchozi sekvence. |
| // nez predchozi sekvence. Tak bude vysílání povoleno po dubu osminásobku zmìøené délky "bitu" plus dalí dva bity jako stopbity. |
| // |
| // |
| //Vlastnosti: |
| // Tento program je shopen detekovat pararitní bit, ale neni shopen detekovat poèet stopbitù. |
| 30,8 → 35,7 |
| // Optimalizovat kod, (hlavne najit casove vyhodnejsi umisteni pro nastavovani defaultnich hodnot promennych) |
| // Bylo bydobre zavest uspavani pred prijetim bajtu. |
| // Vykouset program na ATtiny13 |
| // Program neni vyzkousen pri extremne nizkych rychlostech, kdy by teoreticky |
| // mohlo dochazet k preteceni promenne cas. |
| // Pri rychlostech mensich nez 9600kbps dochazi k pretekani promennych a algoritmus se nechova korektne. |
| // Neni vyzkousen break, byly testovany pouze ASCII znaky vysilane pres terminal z klavesnice. |
| // Aktivovat WatchDog timer. |
| // Neni vyzkouseno na vyssím taktu CPU jak 3,7MHz |
| 52,8 → 56,8 |
| volatile unsigned int preteceni; // promenna na ukladani poctu preteceni casovace |
| volatile unsigned int bit; // promena pro pocitani bitu v bajtu |
| volatile unsigned int bitdelay; // obsahuje aktualni zmereny cas delky bitu |
| volatile unsigned int cas; // urcuje nejkratsi nalezeny cas delky bitu |
| volatile unsigned long int bitdelay; // obsahuje aktualni zmereny cas delky bitu |
| volatile unsigned long int cas; // urcuje nejkratsi nalezeny cas delky bitu |
| ISR(TIMER0_OVF_vect) // interrupt od preteceni casovace |
| { |
| 62,7 → 66,7 |
| ISR(INT1_vect) // interrupt od zmeny vstupu na datech |
| { |
| if ((bitdelay=TCNT0+preteceni*0x0100) < cas) cas = bitdelay; // provnani jestli zrovna zmereny cas je kratsi nez nejmensi znamy cas |
| if ((bitdelay=(TCNT0+preteceni*0x0100)) < cas) cas = bitdelay; // provnani jestli zrovna zmereny cas je kratsi nez nejmensi znamy cas |
| TCNT0 = 0; // zacni znova merit cas zacatku stopbitu |
| preteceni=0; // vynuluj vsechny casove promenne |
| bit++; // posun pocitadlo bitu o jednicku |
| 99,9 → 103,9 |
| { |
| POVOLOVAK_HIGH; // zapni vysilani |
| bit=0; // vynuluj vsechny promenne pro mereni casu a pocitani bitu |
| TCNT0=0; |
| preteceni=0; |
| bit=0; // vynuluj vsechny promenne pro mereni casu a pocitani bitu |
| cas = 0xFFFF; // nastav cas delky bitu na nejvetsi mozny |
| while (bit <= 8) // odpocitej dobu 8mi bitu |
| /programy/Atmel_C/RS232toRS485/default/rs485.elf |
|---|
| Cannot display: file marked as a binary type. |
| svn:mime-type = application/octet-stream |
| /programy/Atmel_C/RS232toRS485/default/rs485.hex |
|---|
| 1,39 → 1,49 |
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| :00000001FF |
| /programy/Atmel_C/RS232toRS485/rs485.aws |
|---|
| 1,0 → 0,0 |
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