Initial Update

MLX90316.cpp

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+/*
+  MLX90316.cpp -  Library to use with Melexis MLX90316 rotary encoder chip.
+  Created by Martin Nawrath KHM 2010.
+	Remix by Patrick Bouffel to ajust to Datasheet - 2018-01-27
+  Released into the public domain.
+*/
+
+#if defined(ARDUINO) && ARDUINO >= 100
+#include "Arduino.h"
+#else
+#include "WProgram.h"
+#endif
+#include "MLX90316.h"
+
+
+// constructor
+MLX90316::MLX90316() {
+};
+
+// attach
+void MLX90316::attach(byte pinSS, byte pinSCK, byte pinMOSI ) {
+
+	_pinSS = pinSS;
+	_pinSCK = pinSCK;
+	_pinMOSI = pinMOSI;
+
+	pinMode(_pinSS , OUTPUT);
+	pinMode(_pinSCK , OUTPUT);
+	pinMode(_pinMOSI , OUTPUT);
+}
+
+//****************************************************** 
+int MLX90316::readAngle() {
+
+  byte bb;
+  long int ret=-1;
+  unsigned int rr=-1;
+  unsigned int cc=-1;
+
+  digitalWrite(_pinSS,0);	// Select Chip
+
+  _spiWByte(0x55);  // send sync byte ( AA reversed order = 55?)
+  _spiWByte(0xFF);  // send sync byte FF)
+
+	rr = (_spiRByte() << 8) + _spiRByte(); // receive 1. byte of mlx data
+	cc = (_spiRByte() << 8) + _spiRByte(); // receive 1. byte of mlx data (inverted)
+
+	if (rr+cc+1!=0) ret=-1;	// check if bit Errors
+	else {
+
+		if ((rr & 3) == 2) {
+		  if ( rr & (1 << 4)) ret=-2;  // Magnetic Field Too Strong
+		  if ( rr & (1 << 5)) ret=-3;  // Magnetic Field Too Weak
+		}
+    else if ((rr & 3) == 1) { // valid angle data ?
+		  rr = (rr >> 2);
+		  ret = rr ;
+		  ret = ret *  3600 / 16384;	// scale output to 360 deg, untit in tens of deg.	
+	  }
+	}
+
+  digitalWrite(_pinSS,1);	// Deselect Chip
+
+  return((int)ret);
+}
+
+//*************************************************************
+// send and receive SPI byte  to/from MLX90316 Chip
+void MLX90316::_spiWByte(uint8_t tx) {
+
+  pinMode(_pinMOSI,OUTPUT);   // switch MOSI pin to output
+
+  for (int ix = 0; ix < 8; ix++){  // receive/transmit 8 SPI bits
+
+    // write SPI transmit bit to sensor
+    if ((tx & 1) != 0) digitalWrite(_pinMOSI,1); 
+    							else digitalWrite(_pinMOSI,0);
+    tx= ( tx >> 1);
+
+    digitalWrite(_pinSCK,1);   // clocksignal positive slope
+    digitalWrite(_pinSCK,0);   // clocksignal negative slope
+  }
+	delayMicroseconds(30);
+
+	pinMode(_pinMOSI,INPUT_PULLUP);    // switch MOSI pin to input
+}
+
+//*************************************************************
+// receive SPI byte  to/from MLX90316 Chip
+uint8_t  MLX90316::_spiRByte() {
+
+  byte rxb=0;
+
+  for (int ix = 0; ix < 8; ix++){  // receive/transmit 8 SPI bits
+
+    digitalWrite(_pinSCK,1);    // clocksignal positive slope
+		delayMicroseconds(5);
+    rxb = ( rxb << 1 );           // shift received byte left
+    if (digitalRead(_pinMOSI) ==1) rxb = rxb | 1; // read respose bit from sensor
+    digitalWrite(_pinSCK,0);   // clocksignal negative slope
+  }
+	delayMicroseconds(30);
+  return(rxb);
+}
+
+
+

MLX90316.h

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+/*
+  MLX90316.cpp -  Library to use with Melexis MLX90316 rotary encoder chip.
+  Created by Martin Nawrath KHM 2010.
+	Remix by Patrick Bouffel to ajust to Datasheet - 2018-01-27
+  Released into the public domain.
+*/
+
+#ifndef MLX90316_h
+#define MLX90316_h
+
+class MLX90316
+{
+  public:
+
+		MLX90316();			// constructor	
+		void attach(byte pin1, byte pin2, byte pin3);	// attach
+
+		int readAngle(); // read sensor angle value
+
+  private:
+
+		byte _pinSCK;
+		byte _pinSS;
+		byte _pinMOSI;
+
+		void  _spiWByte(uint8_t  tx);
+		uint8_t  _spiRByte();
+};
+
+
+#endif

README.md

@@ -1,2 +1,34 @@
 # MLX90316
 Arduino MLX90316 library
+
+```
+#include <Metro.h> //Include Metro library
+#include <MLX90316.h>
+
+byte pinSS = 5;
+byte pinSCK = 3;
+byte pinMOSI = 4;
+
+int angle;
+
+Metro mlxMetro = Metro(5); 
+MLX90316 mlx_1 = MLX90316(); 
+
+void setup(){
+  Serial.begin(115200);
+  mlx_1.attach(pinSS,pinSCK,pinMOSI); 
+  Serial.println("MLX90316 Rotary Position Sensor");
+}
+
+void loop() {
+  if (mlxMetro.check() == 1) { 
+    angle = mlx_1.readAngle();
+    switch (angle) {
+      case -1 : Serial.println("Transmission Error"); break;
+      case -2 : Serial.println("Magnetic Field Too Strong"); break;
+      case -3 : Serial.println("Magnetic Field Too Weak"); break;
+      default:  Serial.println((float)angle/10);
+    }
+  }
+}
+```

examples/MLX90316_readAngle/MLX90316_readAngle.ino

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+/* MLX90316 Rotary Position Sensor */
+
+#include <Metro.h> //Include Metro library
+#include <MLX90316.h>
+
+byte pinSS = 5;
+byte pinSCK = 3;
+byte pinMOSI = 4;
+
+int angle;
+
+Metro mlxMetro = Metro(5); 
+MLX90316 mlx_1 = MLX90316(); 
+
+void setup(){
+  Serial.begin(115200);
+  mlx_1.attach(pinSS,pinSCK,pinMOSI); 
+  Serial.println("MLX90316 Rotary Position Sensor");
+}
+
+void loop() {
+  if (mlxMetro.check() == 1) { 
+    angle = mlx_1.readAngle();
+    switch (angle) {
+      case -1 : Serial.println("Transmission Error"); break;
+      case -2 : Serial.println("Magnetic Field Too Strong"); break;
+      case -3 : Serial.println("Magnetic Field Too Weak"); break;
+      default:  Serial.println((float)angle/10);
+    }
+  }
+}

keywords.txt

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+#######################################
+# Syntax Coloring Map For Test
+#######################################
+
+#######################################
+# Datatypes (KEYWORD1)
+#######################################
+
+MLX90316	KEYWORD1
+
+#######################################
+# Methods and Functions (KEYWORD2)
+#######################################
+
+attach	KEYWORD2
+readAngle	KEYWORD2
+
+#######################################
+# Instances (KEYWORD2)
+#######################################
+
+#######################################
+# Constants (LITERAL1)
+#######################################
+