Support 8-bit boards like Mega2560 (#404)

- Changed frequency from int to long
- Change constructor argument names (remove leading underscores)

src/SH1106Brzo.h

@@ -47,12 +47,12 @@ class SH1106Brzo : public OLEDDisplay {
       uint8_t             _scl;
 
   public:
-	SH1106Brzo(uint8_t _address, uint8_t _sda, uint8_t _scl, OLEDDISPLAY_GEOMETRY g = GEOMETRY_128_64) {
+	SH1106Brzo(uint8_t address, uint8_t sda, uint8_t scl, OLEDDISPLAY_GEOMETRY g = GEOMETRY_128_64) {
 		setGeometry(g);
 
-      this->_address = _address;
-      this->_sda = _sda;
-      this->_scl = _scl;
+      this->_address = address;
+      this->_sda = sda;
+      this->_scl = scl;
     }
 
     bool connect(){

src/SH1106Spi.h

@@ -42,12 +42,12 @@ class SH1106Spi : public OLEDDisplay {
 
   public:
     /* pass _cs as -1 to indicate "do not use CS pin", for cases where it is hard wired low */
-    SH1106Spi(uint8_t _rst, uint8_t _dc, uint8_t _cs, OLEDDISPLAY_GEOMETRY g = GEOMETRY_128_64) {
+    SH1106Spi(uint8_t rst, uint8_t dc, uint8_t cs, OLEDDISPLAY_GEOMETRY g = GEOMETRY_128_64) {
         setGeometry(g);
 
-      this->_rst = _rst;
-      this->_dc  = _dc;
-      this->_cs  = _cs;
+      this->_rst = rst;
+      this->_dc  = dc;
+      this->_cs  = cs;
     }
 
     bool connect(){

src/SH1106Wire.h

@@ -53,7 +53,7 @@ class SH1106Wire : public OLEDDisplay {
       int             _scl;
       bool                _doI2cAutoInit = false;
       TwoWire*            _wire = NULL;
-      int                 _frequency;
+      long                _frequency;
 
   public:
     /**
@@ -71,18 +71,18 @@ class SH1106Wire : public OLEDDisplay {
      * @param _i2cBus on ESP32 with 2 I2C HW buses, I2C_ONE for 1st Bus, I2C_TWO fot 2nd bus, default I2C_ONE
      * @param _frequency for Frequency by default Let's use ~700khz if ESP8266 is in 160Mhz mode, this will be limited to ~400khz if the ESP8266 in 80Mhz mode
      */
-    SH1106Wire(uint8_t _address, int _sda = -1, int _scl = -1, OLEDDISPLAY_GEOMETRY g = GEOMETRY_128_64, HW_I2C _i2cBus = I2C_ONE, int _frequency = 700000) {
+    SH1106Wire(uint8_t address, int sda = -1, int scl = -1, OLEDDISPLAY_GEOMETRY g = GEOMETRY_128_64, HW_I2C i2cBus = I2C_ONE, long frequency = 700000) {
       setGeometry(g);
 
-      this->_address = _address;
-      this->_sda = _sda;
-      this->_scl = _scl;
+      this->_address = address;
+      this->_sda = sda;
+      this->_scl = scl;
 #if !defined(ARDUINO_ARCH_ESP32)
       this->_wire = &Wire;
 #else
-      this->_wire = (_i2cBus==I2C_ONE) ? &Wire : &Wire1;
+      this->_wire = (i2cBus==I2C_ONE) ? &Wire : &Wire1;
 #endif
-      this->_frequency = _frequency;
+      this->_frequency = frequency;
     }
 
     bool connect() {

src/SSD1306Brzo.h

@@ -47,12 +47,12 @@ class SSD1306Brzo : public OLEDDisplay {
       uint8_t             _scl;
 
   public:
-    SSD1306Brzo(uint8_t _address, uint8_t _sda, uint8_t _scl, OLEDDISPLAY_GEOMETRY g = GEOMETRY_128_64) {
+    SSD1306Brzo(uint8_t address, uint8_t sda, uint8_t scl, OLEDDISPLAY_GEOMETRY g = GEOMETRY_128_64) {
       setGeometry(g);
 
-      this->_address = _address;
-      this->_sda = _sda;
-      this->_scl = _scl;
+      this->_address = address;
+      this->_sda = sda;
+      this->_scl = scl;
     }
 
     bool connect(){

src/SSD1306I2C.h

@@ -42,13 +42,13 @@
 
 class SSD1306I2C : public OLEDDisplay {
 public:
-    SSD1306I2C(uint8_t _address, PinName _sda, PinName _scl, OLEDDISPLAY_GEOMETRY g = GEOMETRY_128_64) {
+    SSD1306I2C(uint8_t address, PinName sda, PinName scl, OLEDDISPLAY_GEOMETRY g = GEOMETRY_128_64) {
       setGeometry(g);
 
-      this->_address = _address << 1;  // convert from 7 to 8 bit for mbed.
-      this->_sda = _sda;
-      this->_scl = _scl;
-	  _i2c = new I2C(_sda, _scl);
+      this->_address = address << 1;  // convert from 7 to 8 bit for mbed.
+      this->_sda = sda;
+      this->_scl = scl;
+	  _i2c = new I2C(sda, scl);
     }
 
     bool connect() {

src/SSD1306Spi.h

@@ -48,12 +48,12 @@ class SSD1306Spi : public OLEDDisplay {
 
   public:
     /* pass _cs as -1 to indicate "do not use CS pin", for cases where it is hard wired low */
-    SSD1306Spi(uint8_t _rst, uint8_t _dc, uint8_t _cs, OLEDDISPLAY_GEOMETRY g = GEOMETRY_128_64) {
+    SSD1306Spi(uint8_t rst, uint8_t dc, uint8_t cs, OLEDDISPLAY_GEOMETRY g = GEOMETRY_128_64) {
         setGeometry(g);
 
-      this->_rst = _rst;
-      this->_dc  = _dc;
-      this->_cs  = _cs;
+      this->_rst = rst;
+      this->_dc  = dc;
+      this->_cs  = cs;
     }
 
     bool connect(){

src/SSD1306Wire.h

@@ -53,7 +53,7 @@ class SSD1306Wire : public OLEDDisplay {
       int                 _scl;
       bool                _doI2cAutoInit = false;
       TwoWire*            _wire = NULL;
-      int                 _frequency;
+      long                _frequency;
 
   public:
 
@@ -72,7 +72,7 @@ class SSD1306Wire : public OLEDDisplay {
      * @param _i2cBus on ESP32 with 2 I2C HW buses, I2C_ONE for 1st Bus, I2C_TWO fot 2nd bus, default I2C_ONE
      * @param _frequency for Frequency by default Let's use ~700khz if ESP8266 is in 160Mhz mode, this will be limited to ~400khz if the ESP8266 in 80Mhz mode
      */
-    SSD1306Wire(uint8_t _address, int _sda = -1, int _scl = -1, OLEDDISPLAY_GEOMETRY g = GEOMETRY_128_64, HW_I2C _i2cBus = I2C_ONE, int _frequency = 700000) {
+    SSD1306Wire(uint8_t address, int sda = -1, int scl = -1, OLEDDISPLAY_GEOMETRY g = GEOMETRY_128_64, HW_I2C i2cBus = I2C_ONE, long  frequency = 700000) {
       setGeometry(g);
 
       this->_address = _address;
@@ -81,7 +81,7 @@ class SSD1306Wire : public OLEDDisplay {
 #if !defined(ARDUINO_ARCH_ESP32)
       this->_wire = &Wire;
 #else
-      this->_wire = (_i2cBus==I2C_ONE) ? &Wire : &Wire1;
+      this->_wire = (i2cBus == I2C_ONE) ? &Wire : &Wire1;
 #endif
       this->_frequency = _frequency;
     }