Modified for platform agnosticism

- original code used pointers to registers in the AVR arch to speed
read/write pin access. Changed that to normal digitalWrite digitalRead
functions to allow the code to compile across multiple platforms w/o
any need to adjust library

Author: mhord

src/SFE_MicroOLED.cpp

@@ -178,10 +178,6 @@ void MicroOLED::begin()
 	setDrawMode(NORM);
 	setCursor(0,0);
 
-	dcport	= portOutputRegister(digitalPinToPort(dcPin));
-	dcpinmask	= digitalPinToBitMask(dcPin);
-	dcreg	= portModeRegister(digitalPinToPort(dcPin));
-
 	pinMode(dcPin, OUTPUT);
 	pinMode(rstPin, OUTPUT);
 
@@ -251,10 +247,8 @@ void MicroOLED::command(uint8_t c) {
 
 	if (interface == MODE_SPI)
 	{
-		*dcport &= ~dcpinmask;	// DC pin LOW for a command
-		*ssport &= ~sspinmask;	// SS LOW to initialize transfer
+		digitalWrite(dcPin, LOW);;	// DC pin LOW for a command
 		spiTransfer(c);			// Transfer the command byte
-		*ssport |= sspinmask;	// SS HIGH to end transfer
 	}
 	else if (interface == MODE_I2C)
 	{
@@ -280,11 +274,9 @@ void MicroOLED::data(uint8_t c) {
 
 	if (interface == MODE_SPI)
 	{
-		*dcport |= dcpinmask;	// DC HIGH for a data byte
+		digitalWrite(dcPin, HIGH);	// DC HIGH for a data byte
 
-		*ssport &= ~sspinmask;	// SS LOW to initialize SPI transfer
 		spiTransfer(c); 		// Transfer the data byte
-		*ssport |= sspinmask;	// SS HIGH to end SPI transfer
 	}
 	else if (interface == MODE_I2C)
 	{

src/hardware.cpp

@@ -41,12 +41,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 **/
 void MicroOLED::spiSetup()
 {
-	// Gather the CS pin's PORT, PIN, and DDR registers. Writing
-	// these directly will make things much faster.
-	ssport		= portOutputRegister(digitalPinToPort(csPin));
-	sspinmask	= digitalPinToBitMask(csPin);
-	ssreg		= portModeRegister(digitalPinToPort(csPin));
-	
 	// Initialize the pins:
 	pinMode(MOSI, OUTPUT);	// MOSI is an OUTPUT
 	pinMode(SCK, OUTPUT);	// SCK is an OUTPUT
@@ -67,7 +61,9 @@ void MicroOLED::spiSetup()
 **/
 void MicroOLED::spiTransfer(byte data)
 {
+  digitalWrite(csPin, LOW);
 	SPI.transfer(data);	
+  digitalWrite(csPin, HIGH);
 }
 
 /** \brief Initialize the I2C Interface
@@ -79,9 +75,6 @@ void MicroOLED::i2cSetup()
 {
 	// Initialize Wire library (I2C)
 	Wire.begin();
-	
-	// SCL frequency = (F_CPU) / (16 + 2(TWBR) * (prescalar))
-	TWBR = ((F_CPU / I2C_FREQ) - 16) / 2;
 }
 
 /** \brief  Write a byte over I2C
@@ -105,21 +98,6 @@ void MicroOLED::i2cWrite(byte address, byte dc, byte data)
 **/
 void MicroOLED::parallelSetup()
 {
-	// Gather the CS pin's PORT, PIN and DDR registers.
-	ssport		= portOutputRegister(digitalPinToPort(csPin));
-	sspinmask	= digitalPinToBitMask(csPin);
-	ssreg		= portModeRegister(digitalPinToPort(csPin));
-	
-	// Gather the WR pin's PORT, PIN and DDR registers.
-	wrport		= portOutputRegister(digitalPinToPort(wrPin));
-	wrpinmask	= digitalPinToBitMask(wrPin);
-	wrreg		= portModeRegister(digitalPinToPort(wrPin));
-	
-	// Gather the RD pin's PORT, PIN and DDR registers.
-	rdport		= portOutputRegister(digitalPinToPort(rdPin));
-	rdpinmask	= digitalPinToBitMask(rdPin);
-	rdreg		= portModeRegister(digitalPinToPort(rdPin));
-	
 	// Initialize WR, RD, CS and data pins as outputs.
 	pinMode(wrPin, OUTPUT);
 	digitalWrite(wrPin, HIGH);
@@ -146,18 +124,12 @@ void MicroOLED::parallelWrite(byte data, byte dc)
 
 	// chip select high->low
 	digitalWrite(csPin, LOW);
-	//*ssport &= ~sspinmask;		// SS LOW
 
 	// dc high or low
 	digitalWrite(dcPin, dc);
-	/*if (dc)
-		*dcport |= dcpinmask;	// DC HIGH
-	else
-		*dcport &= ~dcpinmask;  // DC pin LOW*/
 
 	// wr high->low
 	digitalWrite(wrPin, LOW);
-	//*wrport &= ~wrpinmask;		// SS LOW
 
 	// set data pins
 	for (int i=0; i<8; i++)
@@ -167,13 +139,11 @@ void MicroOLED::parallelWrite(byte data, byte dc)
 		else
 			digitalWrite(dPins[i], LOW);
 	}
-	//PORTD = data;
 
 	// wr low->high
 	digitalWrite(wrPin, HIGH);
-	//*wrport |= wrpinmask;	// SS HIGH
 
 	// cs high
 	digitalWrite(csPin, HIGH);
-	//*ssport |= sspinmask;	// SS HIGH
-}
+}
+