Added files from first programming course at OSU

OSU Coursework/CS 161 - Intro to Programming I/Final/wunderboard/adc.c

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+/**
+@file adc.c
+@brief Wunderboard ADC Helper Functions
+@version .01 
+
+@section intro Code Overview
+This is the code for the Wunderboard ADC helper functions.
+*/
+
+#include "adc.h"
+
+unsigned char read_adc(uint8_t channel){
+
+	unsigned char test;
+
+	ADMUX = 0x60 | channel; // Set the channel to the one we want
+	ADCSRA = 0b11000110; // Start a new sample.
+	while ((ADCSRA & 0b00010000) == 0 ); // Wait for a Valid Sample
+	ADCSRA |= 0b00010000; // Tell ADC you have the sample you want.
+	ADCSRA |= 0b01000000; // Start a new sample.
+	while ((ADCSRA & 0b00010000) == 0 ); // Wait for a Valid Sample
+	ADCSRA |= 0b00010000; // Tell ADC you have the sample you want.
+	
+	test = ADCH; 
+	ADCSRA = 0x00; // Disable the ADC
+
+	return (test);
+}