tannenbaum code as base

code/Makefile

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+MCU = atmega328p
+DUDEMCU = m328p
+TARGET = main
+AVRDUDE_PROGRAMMER = atmelice_isp
+FCPU=1000000UL
+
+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 $(DUDEMCU) -c $(AVRDUDE_PROGRAMMER) -U flash:w:$(BUILDDIR)/$(TARGET).hex -B 10
+
+#### 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
+

code/src/main.c

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+#include <avr/io.h>
+#include <stdint.h>            // has to be added to use uint8_t
+#include <avr/interrupt.h>    // Needed to use interrupts
+#include <avr/sleep.h>
+
+unsigned long NextVal(void);
+unsigned long InitSeed();
+void random(void);
+void link_rechts(void);
+
+int (*animation)(void) = &link_rechts;
+
+volatile uint8_t leds = 0x00;
+volatile uint8_t leds_active = 0x00;
+
+volatile uint32_t active_count = 0;     
+volatile uint32_t active_count_max = 13733; // 1 count = 0,065536 s
+
+volatile uint8_t debounce_lock = 0;
+volatile uint8_t debounce_count = 0;
+volatile uint8_t debounce_count_max = 10;
+
+volatile uint16_t count = 0;
+volatile uint16_t count_max = 3;
+
+volatile uint8_t dir = 0;
+
+static unsigned long Seed;
+
+unsigned long InitSeed()
+{
+    return NextVal();
+}
+
+unsigned long NextVal()
+{
+    Seed=Seed*1632125L+1013904223L;
+    return Seed;
+}
+
+void random(){
+    int temp;
+    do{
+        temp=NextVal();
+        temp=1 << (temp%8);
+    }while(temp==leds);
+    leds=temp; 
+}
+
+void link_rechts(){
+    if(dir)
+        leds = leds << 1;
+    else
+        leds = leds >> 1;
+
+    if(!(leds & 0x7F)){
+        leds = 0x08;
+        dir^=1;
+    }
+}
+
+void write_leds(){
+    if(leds_active){
+        PORTC = leds;
+        PORTD = (leds>>1)&((1<<PD1)|(1<<PD2)|(1<<PD3));
+        PORTD = (leds)&((1<<PD5)|(1<<PD6));
+    }
+    else
+    {
+        PORTC = 0;
+        PORTD = 0;
+    }
+}
+
+int main(void)
+{
+    InitSeed();
+    DDRC = 0xFF;
+    DDRD = 0xFF;
+
+    DDRB &= ~(1 << DDB0); // Clear the PB0, PB1, PB2 pin
+    // PB0,PB1,PB2 (PCINT0, PCINT1, PCINT2 pin) are now inputs
+
+    PORTB |= ((1 << PORTB0) | (1 << PORTB1) | (1 << PORTB2)); // turn On the Pull-up
+    // PB0, PB1 and PB2 are now inputs with pull-up enabled
+
+    TIMSK1 |= 1 << TOIE1;
+
+    TCCR0B |= (1<<CS01)|(1<<CS00); 
+    TIMSK0 |= 1 << TOIE0;
+
+    PCICR |= (1 << PCIE0);     // set PCIE0 to enable PCMSK0 scan
+    PCMSK0 |= (1 << PCINT0);   // set PCINT0 to trigger an interrupt on state change
+
+    sei();                     // turn on interrupts
+
+    while(1)
+    {
+        write_leds();
+    }
+}
+
+ISR (PCINT0_vect)
+{
+    if(!debounce_lock){
+        TCCR1B |= (1<<CS00); 
+        debounce_lock=1;
+        if((~PINB & 0x01)) 
+        {
+            leds_active ^= 0x01;
+            active_count=0;
+            if(!leds_active){
+                write_leds();
+                TCCR0B &= ~((1<<CS01)|(1<<CS00)); 
+                set_sleep_mode(SLEEP_MODE_PWR_SAVE);
+                sleep_mode();
+                TCCR0B |= (1<<CS01)|(1<<CS00); 
+            }
+        }
+    }
+}
+
+ISR(TIMER0_OVF_vect){
+    active_count++;
+    if(count>=count_max){
+        count=0;
+        animation();
+    }
+    else
+    {
+        count++;
+    }
+    if(active_count >= active_count_max){
+        active_count=0;
+        leds_active = 0;
+    }
+}
+
+ISR(TIMER1_OVF_vect){
+    if(debounce_count >= debounce_count_max)
+    {
+        TCCR1B &= ~(1<<CS00); 
+        debounce_lock=0;
+        debounce_count=0;
+    }
+    else
+    {
+        debounce_count++;
+    }
+}
+