From c025c161f7c87f5cce22228811502b549c005303 Mon Sep 17 00:00:00 2001
From: Eggert Jung <eggert.s.jung@wischhof13.de>
Date: Thu, 26 Dec 2019 17:04:57 +0100
Subject: [PATCH] initital commit

---
 Makefile   | 152 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/main.c |  46 +++++++++++++++++++
 2 files changed, 198 insertions(+)
 create mode 100644 Makefile
 create mode 100644 src/main.c

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..88fe5d6
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,152 @@
+MCU = attiny2313
+TARGET = main
+AVRDUDE_PROGRAMMER = atmelice_isp
+FCPU=8000000UL
+
+BUILDDIR=build
+
+OPT = s
+SRC = $(shell find src -name '*.c')
+#SRC = main.c
+
+FORMAT = ihex
+
+# List any extra directories to look for include files here.
+#     Each directory must be seperated by a space.
+EXTRAINCDIRS = inc
+
+#### Flags ####
+CFLAGS = -mmcu=$(MCU) -I. \
+-g -O$(OPT) \
+-funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums \
+-Wall -Wstrict-prototypes \
+-Wa,-adhlns=$(<:src/%.c=$(BUILDDIR)/%.lst) \
+-DF_CPU=$(FCPU)\
+$(patsubst %,-I%,$(EXTRAINCDIRS))\
+-std=gnu99 
+#-fno-builtin 
+
+LDFLAGS = -Wl,-Map=$(BUILDDIR)/$(TARGET).map,--cref
+# Minimalistic printf version
+#LDFLAGS += -Wl,-u,vfprintf -lprintf_min
+
+# Floating point printf version (requires -lm below)
+#LDFLAGS += -Wl,-u,vfprintf -lprintf_flt
+
+# -lm = math library
+LDFLAGS += -lm
+#LDFLAGS += -nostdlib
+
+AVRDUDE_FLAGS = -p t2313 -c $(AVRDUDE_PROGRAMMER) -U flash:w:$(BUILDDIR)/$(TARGET).hex
+
+#### Define programs and commands. ####
+CC = avr-gcc
+
+OBJCOPY = avr-objcopy
+OBJDUMP = avr-objdump
+SIZE = avr-size
+AVRDUDE = avrdude
+
+
+REMOVE = rm -f
+COPY = cp
+
+# Define all object files.
+OBJ = $(SRC:src/%.c=$(BUILDDIR)/%.o) 
+
+# Define all listing files.
+LST = $(SRC:src/%.c=$(BUILDDIR)/%.lst)
+
+# Default target: make program!
+all: $(TARGET).elf
+#	$(BUILDDIR)/$(TARGET).lss $(BUILDDIR)/$(TARGET).sym 
+#	$(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH) $(AVRDUDE_WRITE_EEPROM)
+
+# Program the device.  
+program: $(BUILDDIR)/$(TARGET).hex $(BUILDDIR)/$(TARGET).eep
+	$(AVRDUDE) $(AVRDUDE_FLAGS)
+
+
+# Create final output files (.hex, .eep) from ELF output file.
+$(BUILDDIR)/%.hex: %.elf
+	@echo
+	@echo "creating ihex"
+	$(OBJCOPY) -O $(FORMAT) -R .eeprom $< $@
+
+$(BUILDDIR)/%.eep: %.elf
+	@echo
+	@echo "eeprom"
+	-$(OBJCOPY) -j .eeprom --set-section-flags=.eeprom="alloc,load" \
+	--change-section-lma .eeprom=0 -O $(FORMAT) $< $@
+
+# Create extended listing file from ELF output file.
+$(BUILDDIR)/%.lss: %.elf
+	@echo
+	@echo "listing"
+	$(OBJDUMP) -h -S $< > $@
+
+# Create a symbol table from ELF output file.
+$(BUILDDIR)/%.sym: %.elf
+	@echo
+	@echo "symbol table"
+	avr-nm -n $< > $@
+
+
+
+# Link: create ELF output file from object files.
+#.SECONDARY : $(BUILDDIR)/$(TARGET).elf
+#.PRECIOUS : $(OBJ)
+$(TARGET).elf: $(OBJ)
+	@echo 
+	@echo "linking: " $(OBJ)
+	$(CC) $(CFLAGS) $(OBJ) --output $@ $(LDFLAGS)
+
+
+# Compile: create object files from C source files.
+$(BUILDDIR)/%.o : src/%.c
+	@echo
+	@echo "compiling" $<
+	$(CC) -c $(CFLAGS) $< -o $@
+
+
+# Target: clean project.
+clean: 
+	@echo
+	@echo "cleaning"
+	$(REMOVE) $(BUILDDIR)/$(TARGET).hex
+	$(REMOVE) $(BUILDDIR)/$(TARGET).eep
+	$(REMOVE) $(BUILDDIR)/$(TARGET).obj
+	$(REMOVE) $(BUILDDIR)/$(TARGET).cof
+	$(REMOVE) $(TARGET).elf
+	$(REMOVE) $(BUILDDIR)/$(TARGET).map
+	$(REMOVE) $(BUILDDIR)/$(TARGET).obj
+	$(REMOVE) $(BUILDDIR)/$(TARGET).a90
+	$(REMOVE) $(BUILDDIR)/$(TARGET).sym
+	$(REMOVE) $(BUILDDIR)/$(TARGET).lnk
+	$(REMOVE) $(BUILDDIR)/$(TARGET).lss
+	$(REMOVE) $(OBJ)
+	$(REMOVE) $(LST)
+	$(REMOVE) $(SRC:src/%.c=$(BUILDDIR)/%.s)
+	$(REMOVE) $(SRC:src/%.c=$(BUILDDIR)/%.d)
+	$(REMOVE) $(BUILDDIR)/*~
+
+# Automatically generate C source code dependencies. 
+# (Code originally taken from the GNU make user manual and modified 
+# (See README.txt Credits).)
+#
+# Note that this will work with sh (bash) and sed that is shipped with WinAVR
+# (see the SHELL variable defined above).
+# This may not work with other shells or other seds.
+#
+$(BUILDDIR)/%.d: %.c
+	set -e; $(CC) -MM $(CFLAGS) $< \
+	| sed 's,\(.*\)\.o[ :]*,\1.o \1.d : ,g' > $@; \
+	[ -s $@ ] || rm -f $@
+
+
+# Remove the '-' if you want to see the dependency files generated.
+-include $(SRC:.c=.d)
+
+# Listing of phony targets.
+.PHONY : all clean program
+
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..f13406a
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,46 @@
+#include <avr/io.h>
+#include <util/delay.h>
+#include <avr/interrupt.h>
+
+volatile uint8_t duty = 0x127;
+volatile uint8_t count;
+
+int main(void)
+{
+    DDRA = 0xFF;
+    DDRB = 0xFF;
+    DDRD = 0xFF;
+
+    TCCR0B |= (1 << CS00) | (0 << CS01) | (0 << CS02);
+    TIMSK |= (1 << TOIE0);
+    sei();
+
+    while(1)
+    {
+        for(uint8_t i=0; i<255; i++){
+            duty=i;
+            _delay_ms(1);
+        }
+        _delay_ms(1000);
+        for(uint8_t i=255; i>0; i--){
+            duty=i;
+            _delay_ms(1);
+        }
+        duty=0;
+        _delay_ms(1000);
+    }
+}
+
+ISR(TIMER0_OVF_vect){
+    count++;
+    if(duty>count){
+        PORTA = 0xFF;
+        PORTB = 0xFF;
+        PORTD = 0xFF;
+    }
+    else{
+        PORTA = 0x00;
+        PORTB = 0x00;
+        PORTD = 0x00;
+    }
+}