Complete overhaul of i2c code, created library structure

- Progress on https://github.com/pyr0ball/pyr0piezo/issues/30
 - ToDo: Create master library for easy integration with other firmwares

firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/pP_i2c.cpp

@@ -0,0 +1,55 @@
+#include "pP_i2c.h"
+
+void pP_i2c::init() {
+  Wire.begin(pP_i2c_address)
+}
+
+void pP_i2c::i2cInput(int bytesReceived) {
+  for (int a = 0; a < bytesReceived; a++) {
+    if (a < maxBytes) {
+      cmdRcvd[a] = Wire.receive();
+    }
+    else {
+      Wire.receive();
+    }
+  }
+  if (bytesReceived == 1 && (cmdRcvd[0] < regMapSize)) {
+    return;
+  }
+  if (bytesReceived == 1 && (cmdRcvd[0] >= regMapSize)) {
+    cmdRcvd[0] = 0x00;
+    return;
+  }
+  switch (cmdRcvd[0]) {
+    case 0x00:
+      senseInt = (uint8_t) cmdRcvd[1];
+      return;
+      break
+    case 0x01:
+      compInt = (uint8_t) cmdRcvd[1];
+      return;
+      break;
+    case 0x02:
+      GAIN_FACTOR = (uint8_t) cmdRcvd[1];
+      return;
+      break;
+    case 0x03:
+      Hyst = (uint8_t) cmdRcvd[1];
+      return;
+      break;
+    case 0x04:
+      LOOP_DUR = (uint8_t) cmdRcvd[1];
+      return;
+      break;
+    case 0x05:
+      TRG_DUR = (uint8_t) cmdRcvd[1];
+      return;
+      break;
+    case 0x06:
+      voltMeterConstant = (uint8_t) cmdRcvd[1];
+      return;
+      break;
+    default:
+      return;
+  }
+}

firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/pP_i2c.h

@@ -1,25 +1,33 @@
+#ifndef _pP_i2c_h_
+#define _pP_i2c_h_
+
 #include <Wire.h>
 
-/*------------------------------------------------*/
-#ifdef I2C
-  void i2cReply() {
-    if (serialIncoming) {
-      Wire.write("OK");
-    }
-  }
-#endif
+#define pP_i2c_address  0xa0 // I2C Bus Address
+
+#define senseInt_Offset 0x00 // Integer of sense threshold in millivolts
+#define compInt_Offset  0x01 // Integer of comparator threshold in millivolts
+#define gainFactor_Offset 0x02  // Gain adjustment factor. 0=3x, 1=3.5x, 2=4.33x, 3=6x, 4=11x
+#define hysteresis_Offset 0x03  // Hysteresis value for ADC measurements
+#define loopDuration_Offset 0x04  // duration of time between ADC checks and other loop functions
+#define triggerDuration_Offset  0x05 // duration of the Z-axis pulse sent, in ms
+#define voltMeterLong_Offset 0x06  // For fine-tuning the input volt master
+
+/*-------------------------Variables------------------------*/
+#define regMapSize  7
+#define maxBytes  3
+byte regMap[regMapSize];
+byte regMapTemp[regMapSize];
+byte cmdRcvd[maxBytes];
 
 /*------------------------------------------------*/
 
-#ifdef I2C
-	void i2cInput() {
+class pP_i2c {
+  public:
+    pP_i2c(uint8_t address=pP_i2c_address);
+
+    void init();
+    void i2cInput();
+};
 
-	  // receive data from Serial and save it into inputBuffer
-	  
-	  while(Wire.available()) {
-		identifyMarkers();
-		updateParams();
-		i2cReply();
-	  }
-	}
 #endif