Moved arduino specific C files and started working on PWM.

ard/serial.c

@@ -0,0 +1,40 @@
+#include "serial.h"
+#include <avr/io.h>
+
+void serial_init(unsigned int baud){
+	unsigned long baud_prescale = ((16000000UL/(baud*16UL)))-1;
+
+	// enable transmitter and receiver
+	UCSR0B |= (1<<RXEN0)|(1<<TXEN0);
+
+	// set frame format (8 data bits, 2 stop bits)
+	UCSR0C |= (1<<UCSZ00)|(1<<UCSZ01);
+
+	// set baudrate (16 bit)
+	UBRR0H  = baud_prescale>>8;
+	UBRR0L  = baud_prescale;
+}
+
+void serial_write(char* data, unsigned int n){
+	unsigned int i;
+
+	for(i = 0; i < n; i++){
+		// wait for empty tx buffer
+		while(!(UCSR0A&(1<<UDRE0)));
+
+		// write to tx register
+		UDR0 = data[i];
+	}
+}
+
+void serial_read(char* data, unsigned int n){
+	unsigned int i;
+
+	for(i = 0; i < n; i++){
+		// wait until data is available in rx buffer
+		while(!(UCSR0A&(1<<RXC0)));
+
+		// store in data array
+		data[i] = UDR0;
+	}
+}