| /programy/Atmel_C/RS232toRS485/P232.c |
|---|
| 0,0 → 1,112 |
| //---------------------------------------------------------------------------------- |
| // Prevodnik RS232 <--> RS485 |
| // pri startbitu na RS232 zapne okamzite vysilac pokud nejsou detekovana data z RS485. |
| //---------------------------------------------------------------------------------- |
| // |
| //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 |
| // proti pretekani (pocet preteceni se uklada, do promenne s ktere se zpetne vypocita 16bitove cislo, |
| // casovac se tedy virtualne chova jako 16ti bitovy.) |
| // |
| // Tento zpusob detekce neni imuni proti nahodnym chybovim spickam vzniklych v dusledku ruseni. |
| // Proto je nutene napajeni kvalitne stbilizovat, pouzivat blokovaci kondenzatory a |
| // zabezpecit, aby nedochazelo ke zvedani zeme. |
| ///////////////////////////////////////////////////////////////////////////////////// |
| // |
| //TODO: |
| // 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. |
| // Neni vyzkousen break, byly testovany pouze ASCII znaky vysilane pres terminal z klavesnice. |
| ////////////////////////////////////////////////////////////////////////////////////// |
| // |
| #include <avr/io.h> |
| #include <avr/interrupt.h> |
| #include <stdlib.h> |
| #include <ctype.h> |
| #include <avr/eeprom.h> |
| #include <avr/pgmspace.h> |
| #define POVOLOVAK_LOW PORTB &= ~(1<<PB3) // nastaveni nuly na vystup, krery zapina povoleni vysilani RS485 |
| #define POVOLOVAK_HIGH PORTB |= (1<<PB3) // nastaveni jednicky na tentyz vystup |
| #define DATA (PIND & (1<<PD3)) // nastaveni vstupu, na kterem se budou detekovat data, musi byt stejny jako vstup pouziteho interruptu |
| 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 |
| ISR(TIMER0_OVF_vect) // interrupt od preteceni casovace |
| { |
| preteceni++; // kdyz pretece, poznamenej to. |
| } |
| 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 |
| TCNT0 = 0; // zacni znova merit cas zacatku stopbitu |
| preteceni=0; // vynuluj vsechny casove promenne |
| bit++; // posun pocitadlo bitu o jednicku |
| } |
| // ------------------------------------------------------------------ |
| // Main |
| // ------------------------------------------------------------------ |
| int main(void) |
| { |
| int stopbit; |
| // DDRD |= (1<<DDD5); // povoleni vystupu pro blikani ledkou (mozno odebrat) |
| DDRB |= (1<<DDB3); // povoleni vystupu na povolovak |
| TIMSK |= (1 << TOIE0); // Enable timer overflow interrupt |
| MCUCR |= (1 << ISC10); // nastaveni preruseni od zmeny vstupu pro interrupt INT0 |
| GIMSK |= (1 << INT1); // povoleni interruptu INT0 |
| TCCR0B |= (1 << CS00); // Set up timer |
| sei(); // enable interrupts |
| while(1) |
| { |
| if(!DATA) // kdyz je 0 na datech |
| { |
| POVOLOVAK_HIGH; // zapni vysilani |
| bit=0; // vynuluj vsechny promenne pro mereni casu a pocitani bitu |
| TCNT0=0; |
| preteceni=0; |
| cas = 0xFFFF; // nastav cas delky bitu na nejvetsi mozny |
| while (bit <= 8) // odpocitej dobu 8mi bitu |
| { |
| if ((100+TCNT0+preteceni*0x0100) >= cas) // zkontroluj jestli necekame na dalsi bit dele nez je nekratsi znema delka bitu |
| { |
| TCNT0 = 0; // zacni znova merit cas do dalsiho mozneho bitu |
| preteceni=0; |
| bit++; // pokud jsme cekali dele, tak bit uz ubehl, to znamena, ze muzeme pocitadlo bitu posunout o jednicku |
| } |
| } |
| /* while (!DATA); // cekani na stop bit (detekce pripadneho paritniho bitu) |
| for (stopbit=2;stopbit >= 0;stopbit--) // odpocitej dva stopbity |
| { |
| while ((TCNT0+preteceni*0x0100) <= cas) |
| { |
| if(!DATA) break; |
| } |
| }*/ |
| } |
| else POVOLOVAK_LOW; // kdyz je 1 prepni na prijem |
| } |
| return(0); |
| } |
| /programy/Atmel_C/RS232toRS485/default/rs485.elf |
|---|
| Cannot display: file marked as a binary type. |
| svn:mime-type = application/octet-stream |
| Property changes: |
| Added: svn:mime-type |
| +application/octet-stream |
| \ No newline at end of property |
| /programy/Atmel_C/RS232toRS485/default/rs485.hex |
|---|
| 0,0 → 1,28 |
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| :0A01A000C8F2839BC3CFC398BFCF02 |
| :00000001FF |
| /programy/Atmel_C/RS232toRS485/default/Makefile |
|---|
| 0,0 → 1,77 |
| ############################################################################### |
| # Makefile for the project rs485 |
| ############################################################################### |
| ## General Flags |
| PROJECT = rs485 |
| MCU = attiny2313 |
| TARGET = rs485.elf |
| CC = avr-gcc.exe |
| ## Options common to compile, link and assembly rules |
| COMMON = -mmcu=$(MCU) |
| ## Compile options common for all C compilation units. |
| CFLAGS = $(COMMON) |
| CFLAGS += -Wall -gdwarf-2 -DF_CPU=3686400UL -O3 -funsigned-char -funsigned-bitfields |
| CFLAGS += -MD -MP -MT $(*F).o -MF dep/$(@F).d |
| ## Assembly specific flags |
| ASMFLAGS = $(COMMON) |
| ASMFLAGS += $(CFLAGS) |
| ASMFLAGS += -x assembler-with-cpp -Wa,-gdwarf2 |
| ## Linker flags |
| LDFLAGS = $(COMMON) |
| LDFLAGS += |
| ## Intel Hex file production flags |
| HEX_FLASH_FLAGS = -R .eeprom |
| HEX_EEPROM_FLAGS = -j .eeprom |
| HEX_EEPROM_FLAGS += --set-section-flags=.eeprom="alloc,load" |
| HEX_EEPROM_FLAGS += --change-section-lma .eeprom=0 --no-change-warnings |
| ## Libraries |
| LIBS = -lc -lm -lprintf_flt -lprintf_min -lscanf_flt -lscanf_min |
| ## Objects that must be built in order to link |
| OBJECTS = P232.o |
| ## Objects explicitly added by the user |
| LINKONLYOBJECTS = |
| ## Build |
| all: $(TARGET) rs485.hex rs485.eep size |
| ## Compile |
| P232.o: ../P232.c |
| $(CC) $(INCLUDES) $(CFLAGS) -c $< |
| ##Link |
| $(TARGET): $(OBJECTS) |
| $(CC) $(LDFLAGS) $(OBJECTS) $(LINKONLYOBJECTS) $(LIBDIRS) $(LIBS) -o $(TARGET) |
| %.hex: $(TARGET) |
| avr-objcopy -O ihex $(HEX_FLASH_FLAGS) $< $@ |
| %.eep: $(TARGET) |
| -avr-objcopy $(HEX_EEPROM_FLAGS) -O ihex $< $@ || exit 0 |
| %.lss: $(TARGET) |
| avr-objdump -h -S $< > $@ |
| size: ${TARGET} |
| @echo |
| @avr-size -C --mcu=${MCU} ${TARGET} |
| ## Clean target |
| .PHONY: clean |
| clean: |
| -rm -rf $(OBJECTS) rs485.elf dep/* rs485.hex rs485.eep |
| ## Other dependencies |
| -include $(shell mkdir dep 2>/dev/null) $(wildcard dep/*) |
| /programy/Atmel_C/RS232toRS485/rs485.aps |
|---|
| 0,0 → 1,0 |
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| /programy/Atmel_C/RS232toRS485/rs485.aws |
|---|
| 0,0 → 1,0 |
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