Merge Dev into mainline (#1)

* Removing USB
Need to refine the drive to the iron tip

* Update README.md

* * Rewrite all code from scratch
* Only kept settings
* New font
* New PID
* New Menus
* Use Hardware I2C
* Faster System
* Better Heating Time
* No USB
* Full Menu System

workspace/ts100/src/PID.c

@@ -0,0 +1,41 @@
+/*
+ * PID.c
+ *
+ *  Created on: 20 Sep 2016
+ *      Author: ralim
+ */
+
+#include "PID.h"
+#define MAXPIDOUTPUT 50000
+//This function computes the new value for the ON time of the system
+//This is the return value from this function
+int32_t computePID(uint16_t setpoint) {
+	int32_t ITerm = 0;
+	static int16_t lastReading = 0;
+	uint16_t currentReading = readIronTemp(0, 1); //get the current temp of the iron
+	int16_t error = (int16_t) setpoint - (int16_t) currentReading; //calculate the error term
+	ITerm += (pidSettings.ki * error);
+	if (ITerm > MAXPIDOUTPUT)
+		ITerm = MAXPIDOUTPUT;
+	else if (ITerm < 0)
+		ITerm = 0; //cap at 0 since we cant force the iron to cool itself :)
+
+	int16_t DInput = (currentReading - lastReading); //compute the input to the D term
+	int32_t output = (pidSettings.kp * error) + (ITerm)
+			- (pidSettings.kd * DInput);
+	if (output > MAXPIDOUTPUT)
+		output = MAXPIDOUTPUT;
+	else if (output < 0)
+		output = 0;
+
+	lastReading = currentReading; //storing values for next iteration of the loop
+	return output;
+
+}
+/*Sets up the pid values*/
+void setupPID(void) {
+	pidSettings.kp = 22;
+	pidSettings.ki = 7;
+	pidSettings.kd = 2;
+
+}