From 92807aed3d3dc17fdf94d35d8b26c1d894aab9f2 Mon Sep 17 00:00:00 2001
From: Sadeep Madurange <sadeep@asciimx.com>
Date: Sun, 3 Nov 2024 12:36:54 +0800
Subject: Basic servo control.

---
 door_lock/Makefile | 41 +++++++++++++++++++++++++++++++++++++++++
 door_lock/main.c   | 28 ++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+)
 create mode 100644 door_lock/Makefile
 create mode 100644 door_lock/main.c

(limited to 'door_lock')

diff --git a/door_lock/Makefile b/door_lock/Makefile
new file mode 100644
index 0000000..3214ccf
--- /dev/null
+++ b/door_lock/Makefile
@@ -0,0 +1,41 @@
+CC = avr-gcc
+MCU = atmega328p
+TARGET = app
+
+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/door_lock/main.c b/door_lock/main.c
new file mode 100644
index 0000000..7308d35
--- /dev/null
+++ b/door_lock/main.c
@@ -0,0 +1,28 @@
+#include <avr/io.h>
+#include <util/delay.h>
+
+int main(void) {
+	DDRB |= 1 << PINB1; // Set pin 9 on arduino to output
+
+	/* 1. Set Fast PWM mode 14: set WGM11, WGM12, WGM13 to 1 */
+	/* 3. Set pre-scaler of 8 */
+	/* 4. Set Fast PWM non-inverting mode */
+	TCCR1A |= (1 << WGM11) | (1 << COM1A1);
+	TCCR1B |= (1 << WGM12) | (1 << WGM13) | (1 << CS11);
+
+	/* 2. Set ICR1 register: PWM period */
+	ICR1 = 39999;
+
+	/* Offset for correction */
+	int offset = 800;
+
+	/* 5. Set duty cycle */
+	while(1) {
+		OCR1A = 3999 + offset;
+		_delay_ms(5000);
+		OCR1A = 1999 - offset;
+		_delay_ms(5000);
+	}
+
+	return 0;
+}
-- 
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