Add timer interrupt + PWM work

Timer-Interrupt/Makefile

@@ -0,0 +1,24 @@
+MCU = atmega328p
+F_CPU = 16000000UL
+CC = C:\Users\sharm\Desktop\Embedded Programming\avrprojects\avr8-gnu-toolchain-win32_x86_64\bin\avr-gcc
+OBJCOPY = C:\Users\sharm\Desktop\Embedded Programming\avrprojects\avr8-gnu-toolchain-win32_x86_64\bin\avr-objcopy
+AVRDUDE = ../avrdude
+AVRDUDE_PROGRAMMER = arduino
+AVRDUDE_PORT = COM8
+AVRDUDE_BAUD = 115200
+
+CFLAGS = -mmcu=$(MCU) -DF_CPU=$(F_CPU) -Os -Wall
+
+all: main.hex
+
+main.elf: main.c
+	$(CC) $(CFLAGS) main.c -o main.elf
+
+main.hex: main.elf
+	$(OBJCOPY) -O ihex -R .eeprom main.elf main.hex
+
+upload: main.hex
+	$(AVRDUDE) -c $(AVRDUDE_PROGRAMMER) -p $(MCU) -P $(AVRDUDE_PORT) -b $(AVRDUDE_BAUD) -D -U flash:w:main.hex:i
+
+clean:
+	rm -f main.elf main.hex

Timer-Interrupt/main.c

@@ -0,0 +1,39 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <stdint.h>
+
+volatile uint32_t ms = 0;
+
+void timer1_init(void) {
+    TCCR1A = 0;
+    TCCR1B = 0;
+    TCNT1  = 0;
+
+    TCCR1B |= (1 << WGM12);
+    OCR1A = 249;
+    TIMSK1 |= (1 << OCIE1A);
+    TCCR1B |= (1 << CS11) | (1 << CS10);
+    sei();
+}
+
+ISR(TIMER1_COMPA_vect) {
+    ms++;
+}
+
+void delay_ms(uint32_t delay){
+    uint32_t start = ms;
+    while ((ms - start) < delay) {
+    }
+}
+
+int main(void) {
+    DDRC |= (1<<PC0);
+    timer1_init();
+
+    while(1) {
+        PORTC |= (1<<PC0);
+        delay_ms(500);
+        PORTC &= ~(1<<PC0);
+        delay_ms(500);
+    }
+}