Initial commit.

3 files changed, 75 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..596a14b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+# C
+**/*.o
+**/*.elf
+**/*.hex
+**/*.out
+
+# Vim
+*.swp
+*.core
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..27092b1
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,41 @@
+CC = avr-gcc
+MCU = atmega328p
+TARGET = blink
+
+SRC = main.c
+OBJ = $(SRC:.c=.o)
+
+CFLAGS = -std=gnu99
+CFLAGS += -Os
+CFLAGS+= -Wall
+CFLAGS+= -mmcu=$(MCU)
+CFLAGS+= -DF_CPU=16000000UL
+CFLAGS+= -ffunction-sections -fdata-sections
+
+LDFLAGS = -mmcu=$(MCU)
+LDFLAGS += -Wl,--gc-sections
+
+HEX_FLAGS = -O ihex
+HEX_FLAGS += -j .text -j .data
+
+AVRDUDE_FLAGS = -p $(MCU)
+AVRDUDE_FLAGS += -c arduino
+AVRDUDE_FLAGS += -P /dev/cuaU0
+AVRDUDE_FLAGS += -D -U
+
+%.o: %.c
+	 $(CC) $(CFLAGS) -c -o $@ $<
+
+elf: $(OBJ)
+	 $(CC) $(LDFLAGS) $(OBJ) -o $(TARGET).elf
+
+hex: elf
+	 avr-objcopy $(HEX_FLAGS) $(TARGET).elf $(TARGET).hex
+
+upload: hex
+	 avrdude $(AVRDUDE_FLAGS) flash:w:$(TARGET).hex:i
+
+.PHONY: clean
+
+clean:
+	 rm *.o *.elf *.hex 
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..aed9465
--- /dev/null
+++ b/main.c
@@ -0,0 +1,25 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+int main(void)
+{
+	DDRB |= (1 << DDB5);
+
+	TCCR1A = 0;
+	TCNT1 = 65535 - (F_CPU / 1024);
+	TCCR1B = (1 << CS10) | (1 << CS12);
+	TIMSK1 = (1 << TOIE1);
+
+	sei();
+
+	for (;;)
+		;
+
+	return 0;
+}
+
+ISR(TIMER1_OVF_vect)
+{
+	PORTB ^= (1 << 5);
+	TCNT1 = 65535 - (F_CPU / 1024);
+}