Merge pull request #4 from OAkyildiz/master

Fixed MCP3X21treating 3221 as 10-bit instead of 12

Author: pilotak

MCP3X21.cpp

@@ -41,7 +41,7 @@ void MCP3X21::init() {
     _i2c = &Wire;
 }
 
-uint16_t MCP3X21::read() {
+uint16_t MCP3021::read() {
     _i2c->requestFrom(_address, 2U);
 
     if (_i2c->available() == 2) {
@@ -51,6 +51,16 @@ uint16_t MCP3X21::read() {
     return 0xFFFF;
 }
 
+uint16_t MCP3221::read() {
+    _i2c->requestFrom(_address, 2U);
+
+    if (_i2c->available() == 2) {
+        return ((_i2c->read() << 8) | _i2c->read());
+    }
+
+    return 0xFFFF;
+}
+
 MCP3021::MCP3021(uint8_t slave_adr):
     MCP3X21(slave_adr) {
 }

MCP3X21.h

@@ -33,21 +33,24 @@ class MCP3X21 {
     ~MCP3X21(void);
     void init(TwoWire * i2c_obj);
     void init();
-    uint16_t read();
-
+    
   protected:
+    uint16_t read();
     TwoWire * _i2c;
     const uint8_t _address;
+    
 };
 
 class MCP3021 : public MCP3X21 {
   public:
+    uint16_t read();
     explicit MCP3021(uint8_t slave_adr = MCP3X21_DEFAULT_ADDRESS);
     uint16_t toVoltage(uint16_t data, uint32_t vref);
 };
 
 class MCP3221 : public MCP3X21 {
   public:
+    uint16_t read();
     explicit MCP3221(uint8_t slave_adr = MCP3X21_DEFAULT_ADDRESS);
     uint16_t toVoltage(uint16_t data, uint32_t vref);
 };