Added initial files

Makefile

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+
+#########  AVR Project Makefile Template   #########
+######                                        ######
+######    Copyright (C) 2003-2005,Pat Deegan, ######
+######            Psychogenic Inc             ######
+######          All Rights Reserved           ######
+######                                        ######
+###### You are free to use this code as part  ######
+###### of your own applications provided      ######
+###### you keep this copyright notice intact  ######
+###### and acknowledge its authorship with    ######
+###### the words:                             ######
+######                                        ######
+###### "Contains software by Pat Deegan of    ######
+###### Psychogenic Inc (www.psychogenic.com)" ######
+######                                        ######
+###### If you use it as part of a web site    ######
+###### please include a link to our site,     ######
+###### http://electrons.psychogenic.com  or   ######
+###### http://www.psychogenic.com             ######
+######                                        ######
+####################################################
+
+
+##### This Makefile will make compiling Atmel AVR 
+##### micro controller projects simple with Linux 
+##### or other Unix workstations and the AVR-GCC 
+##### tools.
+#####
+##### It supports C, C++ and Assembly source files.
+#####
+##### Customize the values as indicated below and :
+##### make
+##### make disasm 
+##### make stats 
+##### make hex
+##### make writeflash
+##### make gdbinit
+##### or make clean
+#####
+##### See the http://electrons.psychogenic.com/ 
+##### website for detailed instructions
+
+
+####################################################
+#####                                          #####
+#####              Configuration               #####
+#####                                          #####
+##### Customize the values in this section for #####
+##### your project. MCU, PROJECTNAME and       #####
+##### PRJSRC must be setup for all projects,   #####
+##### the remaining variables are only         #####
+##### relevant to those needing additional     #####
+##### include dirs or libraries and those      #####
+##### who wish to use the avrdude programmer   #####
+#####                                          #####
+##### See http://electrons.psychogenic.com/    #####
+##### for further details.                     #####
+#####                                          #####
+####################################################
+
+MCU=atmega328p
+PROGRAMMER_MCU=atmega328p
+F_CPU=16000000
+PROJECTNAME=usartprintf
+PRJSRC=example.c usart_printf/usart_printf.c
+LIBS=
+OPTLEVEL=s
+
+AVRDUDE_PROGRAMMERID=usbasp
+AVRDUDE_PORT=/dev/usb
+
+
+
+HEXFORMAT=ihex
+
+CFLAGS=-I. $(INC) -g -mmcu=$(MCU) -DF_CPU=$(F_CPU) -O$(OPTLEVEL) \
+	-fpack-struct -fshort-enums             \
+	-funsigned-bitfields -funsigned-char    \
+	-Wall -Wstrict-prototypes               \
+	-Wa,-ahlms=$(firstword                  \
+	$(filter %.lst, $(<:.c=.lst)))
+
+CPPFLAGS=-fno-exceptions               \
+	-Wa,-ahlms=$(firstword         \
+	$(filter %.lst, $(<:.cpp=.lst))\
+	$(filter %.lst, $(<:.cc=.lst)) \
+	$(filter %.lst, $(<:.C=.lst)))
+
+ASMFLAGS =-I. $(INC) -mmcu=$(MCU)        \
+	-x assembler-with-cpp            \
+	-Wa,-gstabs,-ahlms=$(firstword   \
+		$(<:.S=.lst) $(<.s=.lst))
+
+
+# linker
+LDFLAGS=-Wl,-Map,$(TRG).map -mmcu=$(MCU) \
+	-lm $(LIBS)
+
+##### executables ####
+CC=avr-gcc
+OBJCOPY=avr-objcopy
+OBJDUMP=avr-objdump
+SIZE=avr-size
+AVRDUDE=avrdude
+REMOVE=rm -f
+
+##### automatic target names ####
+TRG=$(PROJECTNAME).out
+DUMPTRG=$(PROJECTNAME).s
+
+HEXROMTRG=$(PROJECTNAME).hex 
+HEXTRG=$(HEXROMTRG) $(PROJECTNAME).ee.hex
+GDBINITFILE=gdbinit-$(PROJECTNAME)
+
+# Define all object files.
+
+# Start by splitting source files by type
+#  C++
+CPPFILES=$(filter %.cpp, $(PRJSRC))
+CCFILES=$(filter %.cc, $(PRJSRC))
+BIGCFILES=$(filter %.C, $(PRJSRC))
+#  C
+CFILES=$(filter %.c, $(PRJSRC))
+#  Assembly
+ASMFILES=$(filter %.S, $(PRJSRC))
+
+
+# List all object files we need to create
+OBJDEPS=$(CFILES:.c=.o)    \
+	$(CPPFILES:.cpp=.o)\
+	$(BIGCFILES:.C=.o) \
+	$(CCFILES:.cc=.o)  \
+	$(ASMFILES:.S=.o)
+
+# Define all lst files.
+LST=$(filter %.lst, $(OBJDEPS:.o=.lst))
+
+# All the possible generated assembly 
+# files (.s files)
+GENASMFILES=$(filter %.s, $(OBJDEPS:.o=.s)) 
+
+
+.SUFFIXES : .c .cc .cpp .C .o .out .s .S \
+	.hex .ee.hex .h .hh .hpp
+
+
+.PHONY: writeflash clean stats gdbinit stats
+
+# Make targets:
+# all, disasm, stats, hex, writeflash/install, clean
+all: $(TRG)
+
+disasm: $(DUMPTRG) stats
+
+stats: $(TRG)
+	$(OBJDUMP) -h $(TRG)
+	$(SIZE) $(TRG) 
+
+hex: $(HEXTRG)
+
+
+writeflash: hex
+	$(AVRDUDE) -c $(AVRDUDE_PROGRAMMERID)   \
+	 -p $(PROGRAMMER_MCU) -P $(AVRDUDE_PORT) -e        \
+	 -U flash:w:$(HEXROMTRG)
+
+install: writeflash
+
+$(DUMPTRG): $(TRG) 
+	$(OBJDUMP) -S  $< > $@
+
+
+$(TRG): $(OBJDEPS) 
+	$(CC) $(LDFLAGS) -o $(TRG) $(OBJDEPS)
+
+
+#### Generating assembly ####
+# asm from C
+%.s: %.c
+	$(CC) -S $(CFLAGS) $< -o $@
+
+# asm from (hand coded) asm
+%.s: %.S
+	$(CC) -S $(ASMFLAGS) $< > $@
+
+
+# asm from C++
+.cpp.s .cc.s .C.s :
+	$(CC) -S $(CFLAGS) $(CPPFLAGS) $< -o $@
+
+
+
+#### Generating object files ####
+# object from C
+.c.o: 
+	$(CC) $(CFLAGS) -c $< -o $@
+
+
+# object from C++ (.cc, .cpp, .C files)
+.cc.o .cpp.o .C.o :
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
+
+# object from asm
+.S.o :
+	$(CC) $(ASMFLAGS) -c $< -o $@
+
+
+#### Generating hex files ####
+# hex files from elf
+#####  Generating a gdb initialisation file    #####
+.out.hex:
+	$(OBJCOPY) -j .text                    \
+		-j .data                       \
+		-O $(HEXFORMAT) $< $@
+
+.out.ee.hex:
+	$(OBJCOPY) -j .eeprom                  \
+		--change-section-lma .eeprom=0 \
+		-O $(HEXFORMAT) $< $@
+
+
+#####  Generating a gdb initialisation file    #####
+##### Use by launching simulavr and avr-gdb:   #####
+#####   avr-gdb -x gdbinit-myproject           #####
+gdbinit: $(GDBINITFILE)
+
+$(GDBINITFILE): $(TRG)
+	@echo "file $(TRG)" > $(GDBINITFILE)
+	
+	@echo "target remote localhost:1212" \
+		                >> $(GDBINITFILE)
+	
+	@echo "load"        >> $(GDBINITFILE) 
+	@echo "break main"  >> $(GDBINITFILE)
+	@echo "continue"    >> $(GDBINITFILE)
+	@echo
+	@echo "Use 'avr-gdb -x $(GDBINITFILE)'"
+
+
+#### Cleanup ####
+clean:
+	$(REMOVE) $(TRG) $(TRG).map $(DUMPTRG)
+	$(REMOVE) $(OBJDEPS)
+	$(REMOVE) $(LST) $(GDBINITFILE)
+	$(REMOVE) $(GENASMFILES)
+	$(REMOVE) $(HEXTRG)
+	
+
+
+#####                    EOF                   #####

example.c

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+#include <avr/io.h>
+#include <util/delay.h>
+#include <stdint.h>
+#include "usart_printf/usart_printf.h"
+
+#define FAULT_VCC_SHORT 3
+#define FAULT_GND_SHORT 2
+#define FAULT_OPEN_CONN 1
+#define NO_FAULT 		0
+
+int main(void) {
+
+	usart_initialize();
+	stdout = &uart_output;
+	_delay_ms(10);
+	
+	for(;;) {
+
+		printf("Hello AVR printf");
+		_delay_ms(1000);
+	}
+
+
+}
+
+

usart_printf/usart_printf.c

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+#include <avr/io.h>
+#include <avr/sfr_defs.h>
+#include <stdio.h>
+
+#define BAUD_RATE 9600
+#define BAUD_PRESCALE (F_CPU/16/BAUD_RATE-1)
+
+void usart_initialize(void) {
+	UBRR0H = (BAUD_PRESCALE >> 8);
+	UBRR0L = BAUD_PRESCALE;
+
+	//Enable receive and transmit
+	UCSR0B = (1<<RXEN0) | (1<<TXEN0);
+
+	// Set frame to 8 bits
+	UCSR0C = (1<<UCSZ01) | (1<<UCSZ00);
+}
+
+void usart_send_byte(char byte, FILE *stream) {
+	if (byte == '\n') {
+		usart_send_byte('\r',stream);
+	}
+		loop_until_bit_is_set(UCSR0A,UDRE0);
+		UDR0 = byte;
+	
+}
+
+
+char usart_get_byte(FILE *stream) {
+    loop_until_bit_is_set(UCSR0A, RXC0);
+    return UDR0;
+}

usart_printf/usart_printf.h

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+#ifndef USART_PRINTF_H
+#define USART_PRINTF_H
+#include <stdio.h>
+
+
+
+void usart_send_byte(char byte, FILE *stream);
+char usart_get_byte(FILE *stream);
+void usart_initialize(void);
+
+
+FILE uart_output = FDEV_SETUP_STREAM(usart_send_byte, NULL, _FDEV_SETUP_WRITE);
+FILE uart_input = FDEV_SETUP_STREAM(NULL, usart_get_byte, _FDEV_SETUP_READ);
+
+
+
+
+#endif