Merge pull request #25 from penfold42/ssdflip

Added i2cLcdFlip = 0/1 to flip display 180 deg

src/SSD1306.cpp

@@ -57,7 +57,7 @@ extern "C"
 
 unsigned char frame[SSD1306_128x64_BYTES];
 
-SSD1306::SSD1306(int BSCMaster, u8 address)
+SSD1306::SSD1306(int BSCMaster, u8 address, int flip)
 	: BSCMaster(BSCMaster)
 	, address(address)
 {
@@ -73,9 +73,13 @@ SSD1306::SSD1306(int BSCMaster, u8 address)
 
 	SendCommand(SSD1306_CMD_SET_START_LINE | 0x0);
 
+	if (flip) {
+		SendCommand(0xA0);  // No Segment Re-Map
+		SendCommand(0xC0);  // No COM Output Scan Direction
+	} else {
 		SendCommand(0xA1);  // Set Segment Re-Map
-
 		SendCommand(0xC8);  // Set COM Output Scan Direction
+	}
 
 	SendCommand(SSD1306_CMD_SET_COM_PINS);	// Layout and direction
 	SendCommand(0x12);

src/SSD1306.h

@@ -72,7 +72,7 @@ class SSD1306
 public:
 	// 128x32 0x3C
 	// 128x64 0x3D or 0x3C (if SA0 is grounded)
-	SSD1306(int BSCMaster = 1, u8 address = 0x3C);
+	SSD1306(int BSCMaster = 1, u8 address = 0x3C, int flip = 0);
 
 	void PlotCharacter(int x, int y, char ascii, bool inverse);
 	void Plottext(int x, int y, char* str, bool inverse);

src/ScreenLCD.cpp

@@ -22,7 +22,7 @@
 #include <stdio.h>
 #include "debug.h"
 
-void ScreenLCD::Open(u32 widthDesired, u32 heightDesired, u32 colourDepth, int BSCMaster, int LCDAddress)
+void ScreenLCD::Open(u32 widthDesired, u32 heightDesired, u32 colourDepth, int BSCMaster, int LCDAddress, int LCDFlip)
 {
 	bpp = 1;
 
@@ -38,7 +38,7 @@ void ScreenLCD::Open(u32 widthDesired, u32 heightDesired, u32 colourDepth, int B
 	width = widthDesired;
 	height = heightDesired;
 
-	ssd1306 = new SSD1306(BSCMaster, LCDAddress);
+	ssd1306 = new SSD1306(BSCMaster, LCDAddress, LCDFlip);
 	ssd1306->DisplayOn();
 	ssd1306->Plottext(5, 1, "Pi1541", false);
 	ssd1306->RefreshScreen();

src/ScreenLCD.h

@@ -32,7 +32,7 @@ public:
 	{
 	}
 
-	void Open(u32 width, u32 height, u32 colourDepth, int BSCMaster, int LCDAddress);
+	void Open(u32 width, u32 height, u32 colourDepth, int BSCMaster, int LCDAddress, int LCDFlip);
 
 	void ClearArea(u32 x1, u32 y1, u32 x2, u32 y2, RGBA colour);
 	void Clear(RGBA colour);

src/main.cpp

@@ -1025,7 +1025,9 @@ static void CheckOptions()
 		screen.PrintText(false, 0, y_pos+=16, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
 		snprintf(tempBuffer, tempBufferSize, "invertIECOutputs = %d\r\n", options.InvertIECOutputs());
 		screen.PrintText(false, 0, y_pos+=16, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
-		snprintf(tempBuffer, tempBufferSize, "i2cBusAddress = %d\r\n", options.I2CLcdAddress());
+		snprintf(tempBuffer, tempBufferSize, "i2cLcdAddress = %d\r\n", options.I2CLcdAddress());
+		screen.PrintText(false, 0, y_pos+=16, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
+		snprintf(tempBuffer, tempBufferSize, "i2cLcdFlip = %d\r\n", options.I2CLcdFlip());
 		screen.PrintText(false, 0, y_pos+=16, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
 		IEC_Bus::WaitMicroSeconds(5 * 1000000);
 	}
@@ -1166,10 +1168,11 @@ extern "C"
 
 		int i2cBusMaster = options.I2CBusMaster();
 		int i2cLcdAddress = options.I2CLcdAddress();
+		int i2cLcdFlip = options.I2CLcdFlip();
 		if (strcasecmp(options.GetLCDName(), "ssd1306_128x64") == 0)
 		{
 			screenLCD = new ScreenLCD();
-			screenLCD->Open(128, 64, 1, i2cBusMaster, i2cLcdAddress);
+			screenLCD->Open(128, 64, 1, i2cBusMaster, i2cLcdAddress, i2cLcdFlip);
 		}
 		else
 		{

src/options.cpp

@@ -141,6 +141,7 @@ Options::Options(void)
 	, screenHeight(768)
 	, i2cBusMaster(1)
 	, i2cLcdAddress(0x3C)
+	, i2cLcdFlip(0)
 	, keyboardBrowseLCDScreen(0)
 {
 	strcpy(ROMFontName, "chargen");
@@ -204,6 +205,7 @@ void Options::Process(char* buffer)
 		ELSE_CHECK_DECIMAL_OPTION(screenHeight)
 		ELSE_CHECK_DECIMAL_OPTION(i2cBusMaster)
 		ELSE_CHECK_DECIMAL_OPTION(i2cLcdAddress)
+		ELSE_CHECK_DECIMAL_OPTION(i2cLcdFlip)
 		ELSE_CHECK_DECIMAL_OPTION(keyboardBrowseLCDScreen)
 		else if ((strcasecmp(pOption, "StarFileName") == 0))
 		{

src/options.h

@@ -70,6 +70,7 @@ public:
 
 	inline unsigned int I2CBusMaster() const { return i2cBusMaster; }
 	inline unsigned int I2CLcdAddress() const { return i2cLcdAddress; }
+	inline unsigned int I2CLcdFlip() const { return i2cLcdFlip; }
 
 	// Page up and down will jump a different amount based on the maximum number rows displayed.
 	// Perhaps we should use some keyboard modifier to the the other screen?
@@ -103,6 +104,7 @@ private:
 
 	unsigned int i2cBusMaster;
 	unsigned int i2cLcdAddress;
+	unsigned int i2cLcdFlip;
 
 	unsigned int keyboardBrowseLCDScreen;