ATMega128 UART 통신 샘플(RS232, 0번 USART)

main.c

#include "main.h" #include "serial.h" int main(void) {   Init_Uart0();   sei();      while(1)   {     sleep();   }      return 0; }

main.h

#ifndef __MAIN_HEADER__ #define sei()    __asm__ __volatile__ ("sei" ::) #define sleep()  __asm__ __volatile__ ( "sleep" "\n\t" :: ); #endif // __MAIN_HEADER__

serial.c

#include "serial.h" unsigned char Uart_ReadChar(void) {    while (0==(UCSR0A & (1<<RXC)));    return UDR0; } void   Uart_WriteChar(unsigned char data) {   while (0==(UCSR0A & (1<<TXC)));   UDR0 = data; } void Init_Uart0(void) {   UBRR0L = (unsigned char)BAUD_RATE_L;   UBRR0H = (unsigned char)BAUD_RATE_H;   // RX Complete Interrupt ON   // TX Complete Interrupt OFF   // USART Data Register Empty Interrupt OFF   // Receiver Enable   // Transmitter Enable   // Character Size UCSZ2 = 0   UCSR0B = (1 << TXEN ) | (1 << RXEN )|(1<<RXCIE);   // USART Mode     = Asynchronous   // Parity Mode     = Disabled(0,0)   // Stop Bit Select    = 1-bit   // Character Size UCSZ = 8Bit(0, 1, 1)   // Clock Polarity    = Not Setting(synchronous mode only)   UCSR0C = (1 << UCSZ1) | (1 << UCSZ0); } void __vector_18 (void) {   static unsigned char ucData;   // Read   while (0==(UCSR0A & (1<<RXC)));   ucData = UDR0;   // Echo   while (0==(UCSR0A & (1<<TXC)));   UDR0 = ucData; }

serial.h

#ifndef __ATMEGA128_UART__ #include "main.h" //USART0 Define #define UBRR0L  (*((unsigned char *)0x29)) #define UBRR0H  (*((unsigned char *)0x90)) #define UCSR0A  (*((unsigned char *)0x2B)) #define UCSR0B  (*((unsigned char *)0x2A)) #define UDR0    (*((unsigned char *)0x2C)) #define UCSR0C  (*((unsigned char *)0x95)) //UCSRA Define #define RXC    7  // USART Receive Complete #define TXC    6  // USART Transmit Complete #define UDRE   5  // USART Data Register Empty #define FE     4  // Frame Error #define DOR    3  // Data OverRun #define UPE    2  // Parity Error #define U2X    1  // Double the USART Transmission Speed #define MPCM   0  // Multi-Processor Communication Mode //UCSRB Define #define RXCIE  7  // RX Complete Interrupt Enable #define TXCIE  6  // TX Complete Interrupt Enable #define UDRIE  5  // USART Data Register Empty Interrupt Enable #define RXEN   4  // Receiver Enable #define TXEN   3  // Transmitter Enable #define UCSZ2  2  // Character Size #define RXB8   1  // Receive Data Bit 8 #define TXB8   0  // Transmit Data Bit 8 //UCSRC Define #define UMSEL  6  // USART Mode Select #define UPM1   5  // Parity Mode #define UPM0   4  // Parity Mode #define USBS   3  // Stop Bit Select #define UCSZ1  2  // Character Size #define UCSZ0  1  // Character Size #define UCPOL  0  // Clock Polarity #define BAUD_RATE   115200 #define BAUD_RATE_L (((F_CPU / (16L * BAUD_RATE)) - 1)) #define BAUD_RATE_H (((F_CPU / (16L * BAUD_RATE)) - 1) >> 8) void           Init_Uart0(void); unsigned char  Uart_ReadChar(void); void           Uart_WriteChar(unsigned char); void           __vector_18 (void) __attribute__ ((signal, used, externally_visible)); #endif //__ATMEGA128_UART__

makefile

MCU = atmega128 F_CPU = 16000000 FORMAT = ihex TARGET = main OBJDIR = . SRC = $(TARGET).c serial.c CPPSRC =  ASRC = OPT = s DEBUG = dwarf-2 EXTRAINCDIRS =  # Compiler flag to set the C Standard level. #     c89   = "ANSI" C #     gnu89 = c89 plus GCC extensions #     c99   = ISO C99 standard (not yet fully implemented) #     gnu99 = c99 plus GCC extensions CSTANDARD = -std=gnu99 CDEFS = -DF_CPU=$(F_CPU)UL ADEFS = -DF_CPU=$(F_CPU) CPPDEFS = -DF_CPU=$(F_CPU)UL CFLAGS = -g$(DEBUG) CFLAGS += --save-temps CFLAGS += $(CDEFS) CFLAGS += -O$(OPT) CFLAGS += -funsigned-char CFLAGS += -funsigned-bitfields CFLAGS += -fpack-struct CFLAGS += -fshort-enums CFLAGS += -Wall CFLAGS += -Wstrict-prototypes CFLAGS += -Wa,-adhlns=$(<:%.c=$(OBJDIR)/%.lst) CFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS)) CFLAGS += $(CSTANDARD) CPPFLAGS = -g$(DEBUG) CPPFLAGS += $(CPPDEFS) CPPFLAGS += -O$(OPT) CPPFLAGS += -funsigned-char CPPFLAGS += -funsigned-bitfields CPPFLAGS += -fpack-struct CPPFLAGS += -fshort-enums CPPFLAGS += -fno-exceptions CPPFLAGS += -Wall CFLAGS += -Wundef CPPFLAGS += -Wa,-adhlns=$(<:%.cpp=$(OBJDIR)/%.lst) CPPFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS)) ASFLAGS = $(ADEFS) -Wa,-adhlns=$(<:%.S=$(OBJDIR)/%.lst),-gstabs,--listing-cont-lines=100 PRINTF_LIB_MIN = -Wl,-u,vfprintf -lprintf_min PRINTF_LIB_FLOAT = -Wl,-u,vfprintf -lprintf_flt PRINTF_LIB =  SCANF_LIB_MIN = -Wl,-u,vfscanf -lscanf_min SCANF_LIB_FLOAT = -Wl,-u,vfscanf -lscanf_flt SCANF_LIB =  MATH_LIB = -lm EXTRALIBDIRS =  EXTMEMOPTS = LDFLAGS = -Wl,-Map=$(TARGET).map,--cref LDFLAGS += $(EXTMEMOPTS) LDFLAGS += $(patsubst %,-L%,$(EXTRALIBDIRS)) LDFLAGS += $(PRINTF_LIB) $(SCANF_LIB) $(MATH_LIB) AVRDUDE_PROGRAMMER = stk500v2 AVRDUDE_PORT = com1    # programmer connected to serial device AVRDUDE_WRITE_FLASH = -U flash:w:$(TARGET).hex AVRDUDE_FLAGS = -p $(MCU) -P $(AVRDUDE_PORT) -c $(AVRDUDE_PROGRAMMER) AVRDUDE_FLAGS += $(AVRDUDE_NO_VERIFY) AVRDUDE_FLAGS += $(AVRDUDE_VERBOSE) AVRDUDE_FLAGS += $(AVRDUDE_ERASE_COUNTER) DEBUG_MFREQ = $(F_CPU) DEBUG_UI = insight DEBUG_BACKEND = avarice GDBINIT_FILE = __avr_gdbinit JTAG_DEV = /dev/com1 DEBUG_PORT = 4242 DEBUG_HOST = localhost SHELL = sh CC = avr-gcc OBJCOPY = avr-objcopy OBJDUMP = avr-objdump SIZE = avr-size AR = avr-ar rcs NM = avr-nm AVRDUDE = avrdude REMOVE = rm -f REMOVEDIR = rm -rf COPY = cp WINSHELL = cmd MSG_ERRORS_NONE = Errors: none MSG_BEGIN = -------- begin -------- MSG_END = --------  end  -------- MSG_SIZE_BEFORE = Size before:  MSG_SIZE_AFTER = Size after: MSG_COFF = Converting to AVR COFF: MSG_EXTENDED_COFF = Converting to AVR Extended COFF: MSG_FLASH = Creating load file for Flash: MSG_EEPROM = Creating load file for EEPROM: MSG_EXTENDED_LISTING = Creating Extended Listing: MSG_SYMBOL_TABLE = Creating Symbol Table: MSG_LINKING = Linking: MSG_COMPILING = Compiling C: MSG_COMPILING_CPP = Compiling C++: MSG_ASSEMBLING = Assembling: MSG_CLEANING = Cleaning project: MSG_CREATING_LIBRARY = Creating library: OBJ = $(SRC:%.c=$(OBJDIR)/%.o) $(CPPSRC:%.cpp=$(OBJDIR)/%.o) $(ASRC:%.S=$(OBJDIR)/%.o)  LST = $(SRC:%.c=$(OBJDIR)/%.lst) $(CPPSRC:%.cpp=$(OBJDIR)/%.lst) $(ASRC:%.S=$(OBJDIR)/%.lst)  GENDEPFLAGS = -MMD -MP -MF .dep/$(@F).d ALL_CFLAGS = -mmcu=$(MCU) -I. $(CFLAGS) $(GENDEPFLAGS) ALL_CPPFLAGS = -mmcu=$(MCU) -I. -x c++ $(CPPFLAGS) $(GENDEPFLAGS) ALL_ASFLAGS = -mmcu=$(MCU) -I. -x assembler-with-cpp $(ASFLAGS) all: begin gccversion sizebefore build sizeafter end build: elf hex eep lss sym elf: $(TARGET).elf hex: $(TARGET).hex eep: $(TARGET).eep lss: $(TARGET).lss sym: $(TARGET).sym LIBNAME=lib$(TARGET).a lib: $(LIBNAME) begin:   @echo   @echo $(MSG_BEGIN) end:   @echo $(MSG_END)   @echo HEXSIZE = $(SIZE) --target=$(FORMAT) $(TARGET).hex ELFSIZE = $(SIZE) --mcu=$(MCU) --format=avr $(TARGET).elf sizebefore:   @if test -f $(TARGET).elf; then echo; echo $(MSG_SIZE_BEFORE); $(ELFSIZE); \   2>/dev/null; echo; fi sizeafter:   @if test -f $(TARGET).elf; then echo; echo $(MSG_SIZE_AFTER); $(ELFSIZE); \   2>/dev/null; echo; fi gccversion :    @$(CC) --version program: $(TARGET).hex $(TARGET).eep   $(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH) $(AVRDUDE_WRITE_EEPROM) gdb-config:    @$(REMOVE) $(GDBINIT_FILE)   @echo define reset >> $(GDBINIT_FILE)   @echo SIGNAL SIGHUP >> $(GDBINIT_FILE)   @echo end >> $(GDBINIT_FILE)   @echo file $(TARGET).elf >> $(GDBINIT_FILE)   @echo target remote $(DEBUG_HOST):$(DEBUG_PORT)  >> $(GDBINIT_FILE) ifeq ($(DEBUG_BACKEND),simulavr)   @echo load  >> $(GDBINIT_FILE) endif   @echo break main >> $(GDBINIT_FILE) debug: gdb-config $(TARGET).elf ifeq ($(DEBUG_BACKEND), avarice)   @echo Starting AVaRICE - Press enter when "waiting to connect" message displays.   @$(WINSHELL) /c start avarice --jtag $(JTAG_DEV) --erase --program --file \   $(TARGET).elf $(DEBUG_HOST):$(DEBUG_PORT)   @$(WINSHELL) /c pause else   @$(WINSHELL) /c start simulavr --gdbserver --device $(MCU) --clock-freq \   $(DEBUG_MFREQ) --port $(DEBUG_PORT) endif   @$(WINSHELL) /c start avr-$(DEBUG_UI) --command=$(GDBINIT_FILE) COFFCONVERT = $(OBJCOPY) --debugging COFFCONVERT += --change-section-address .data-0x800000 COFFCONVERT += --change-section-address .bss-0x800000 COFFCONVERT += --change-section-address .noinit-0x800000 COFFCONVERT += --change-section-address .eeprom-0x810000 coff: $(TARGET).elf   @echo   @echo $(MSG_COFF) $(TARGET).cof   $(COFFCONVERT) -O coff-avr $< $(TARGET).cof extcoff: $(TARGET).elf   @echo   @echo $(MSG_EXTENDED_COFF) $(TARGET).cof   $(COFFCONVERT) -O coff-ext-avr $< $(TARGET).cof %.hex: %.elf   @echo   @echo $(MSG_FLASH) $@   $(OBJCOPY) -O $(FORMAT) -R .eeprom -R .fuse -R .lock $< $@ %.eep: %.elf   @echo   @echo $(MSG_EEPROM) $@   -$(OBJCOPY) -j .eeprom --set-section-flags=.eeprom="alloc,load" \   --change-section-lma .eeprom=0 --no-change-warnings -O $(FORMAT) $< $@ || exit 0 %.lss: %.elf   @echo   @echo $(MSG_EXTENDED_LISTING) $@   $(OBJDUMP) -h -S -z $< > $@ %.sym: %.elf   @echo   @echo $(MSG_SYMBOL_TABLE) $@   $(NM) -n $< > $@ .SECONDARY : $(TARGET).a .PRECIOUS : $(OBJ) %.a: $(OBJ)   @echo   @echo $(MSG_CREATING_LIBRARY) $@   $(AR) $@ $(OBJ) .SECONDARY : $(TARGET).elf .PRECIOUS : $(OBJ) %.elf: $(OBJ)   @echo   @echo $(MSG_LINKING) $@   $(CC) $(ALL_CFLAGS) $^ --output $@ $(LDFLAGS) $(OBJDIR)/%.o : %.c   @echo   @echo $(MSG_COMPILING) $<   $(CC) -c $(ALL_CFLAGS) $< -o $@  $(OBJDIR)/%.o : %.cpp   @echo   @echo $(MSG_COMPILING_CPP) $<   $(CC) -c $(ALL_CPPFLAGS) $< -o $@  %.s : %.c   $(CC) -S $(ALL_CFLAGS) $< -o $@ %.s : %.cpp   $(CC) -S $(ALL_CPPFLAGS) $< -o $@ $(OBJDIR)/%.o : %.S   @echo   @echo $(MSG_ASSEMBLING) $<   $(CC) -c $(ALL_ASFLAGS) $< -o $@ %.i : %.c   $(CC) -E -mmcu=$(MCU) -I. $(CFLAGS) $< -o $@  clean: begin clean_list end clean_list :   @echo   @echo $(MSG_CLEANING)   $(REMOVE) $(TARGET).hex   $(REMOVE) $(TARGET).eep   $(REMOVE) $(TARGET).cof   $(REMOVE) $(TARGET).elf   $(REMOVE) $(TARGET).map   $(REMOVE) $(TARGET).sym   $(REMOVE) $(TARGET).lss   $(REMOVE) $(SRC:%.c=$(OBJDIR)/%.o)   $(REMOVE) $(SRC:%.c=$(OBJDIR)/%.lst)   $(REMOVE) $(SRC:.c=.s)   $(REMOVE) $(SRC:.c=.d)   $(REMOVE) $(SRC:.c=.i)   $(REMOVEDIR) .dep $(shell mkdir $(OBJDIR) 2>/dev/null) -include $(shell mkdir .dep 2>/dev/null) $(wildcard .dep/*) .PHONY : all begin finish end sizebefore sizeafter gccversion \ build elf hex eep lss sym coff extcoff \ clean clean_list program debug gdb-config