Help further reduce overdriving display inputs

(and fixed a few spelling errors in comments)
- Use fast pin change macros for RESET, SS and DC.
- Implement MVSPI.packetBegin() and MVSPI.packetEnd() to allow sending
  multiple byte "packets" while SS remains enabled.
- Add 2 and 3 byte command() functions to send multiple command bytes in
  one packet.
- Modify clear() and display() functions to send commands and data in
  packets.
- Do the "wait for SPI transfer complete" just before sending the next
  byte (plus after the last or only byte) in a packet, so code can be
  executed while bytes are being sent.
- Disable SPI mode when not transmitting, so MOSI (and SCK) will go low.
- Keep DC low except when sending data bytes.
- Change MVSPI.transfer() to void since nothing can be received from
  the display.

MicroView.h

@@ -26,12 +26,12 @@
 
 #define OLEDPWR	4	// 3.3V regulator enable
 
-#define DC		8
+// Port and bit mappings for DC, RESET, SS
+// ** These are CPU dependent **
 #define DCPORT	PORTB
 #define DCDDR	DDRB
 #define DCBIT	0
 
-#define RESET	7
 #define RESETPORT	PORTD
 #define RESETDDR	DDRD
 #define RESETBIT	7
@@ -40,20 +40,21 @@
 #define SSDDR	DDRB
 #define SSBIT	2
 
+// Macros to quickly set DC, RESET, SS
+// A HIGH sets the signal to input mode with the internal pullup enabled
 #define DCHIGH ((DCPORT |= _BV(DCBIT)), (DCDDR &= ~_BV(DCBIT)))
 #define DCLOW ((DCPORT &= ~_BV(DCBIT)), (DCDDR |= _BV(DCBIT)))
 
 #define RESETHIGH ((RESETPORT |= _BV(RESETBIT)), (RESETDDR &= ~_BV(RESETBIT)))
 #define RESETLOW ((RESETPORT &= ~_BV(RESETBIT)), (RESETDDR |= _BV(RESETBIT)))
 
-// SS, SCK, MOSI already defined by original pins_arduino.h
-//#define CS 		10
-//#define SCK		13
-//#define MOSI	11
-
 #define SSHIGH ((SSPORT |= _BV(SSBIT)), (SSDDR &= ~_BV(SSBIT)))
 #define SSLOW ((SSPORT &= ~_BV(SSBIT)), (SSDDR |= _BV(SSBIT)))
 
+// SCK, MOSI already defined by original pins_arduino.h
+//#define SCK	13
+//#define MOSI	11
+
 #define BLACK 0
 #define WHITE 1
 
@@ -86,6 +87,9 @@
 #define SETMULTIPLEX 		0xA8
 #define SETLOWCOLUMN 		0x00
 #define SETHIGHCOLUMN 		0x10
+#define SETPAGE				0xB0
+#define SETCOLUMNBOUNDS		0x21
+#define SETPAGEBOUNDS		0x22
 #define SETSTARTLINE 		0x40
 #define MEMORYMODE 			0x20
 #define COMSCANINC 			0xC0
@@ -141,6 +145,8 @@ public:
 
 	// RAW LCD functions
 	void command(uint8_t c);
+	void command(uint8_t c1, uint8_t c2);
+	void command(uint8_t c1, uint8_t c2, uint8_t c3);
 	void data(uint8_t c);
 	void setColumnAddress(uint8_t add);
 	void setPageAddress(uint8_t add);
@@ -199,10 +205,6 @@ public:
 	void doCmd(uint8_t index);
 	
 private:
-	//uint8_t cs;
-	//volatile uint8_t *mosiport, *sckport;
-	volatile uint8_t *ssport, *dcport, *ssreg, *dcreg;	// use volatile because these are fixed location port address
-	uint8_t mosipinmask, sckpinmask, sspinmask, dcpinmask;
 	uint8_t foreColor,drawMode,fontWidth, fontHeight, fontType, fontStartChar, fontTotalChar, cursorX, cursorY;
 	uint16_t fontMapWidth;
 	//unsigned char *fontsPointer[TOTALFONTS];
@@ -282,8 +284,17 @@ private:
 
 class MVSPIClass {
 public:
+/** \brief Wait for SPI serial transfer complete. */
+  inline static void wait();
+
 /** \brief Transfer data byte via SPI port. */
-  inline static byte transfer(byte _data);
+  inline static void transfer(byte _data);
+
+/** \brief Set up to begin a SPI packet transmit */
+  static void packetBegin();
+
+/** \brief End a SPI packet transmit */
+  static void packetEnd();
 
   // SPI Configuration methods
 
@@ -300,11 +311,13 @@ public:
 
 extern MVSPIClass MVSPI;
 
-byte MVSPIClass::transfer(byte _data) {
-  SPDR = _data;
+void MVSPIClass::wait() {
   while (!(SPSR & _BV(SPIF)))
     ;
-  return SPDR;
+}
+
+void MVSPIClass::transfer(byte _data) {
+  SPDR = _data;
 }
 
 void MVSPIClass::attachInterrupt() {