CBM font usable on LCD display

Put "i2cLcdUseCBMChar = 1" to the option.txt file.
You have to use the Chargen rom too

options.txt

@@ -94,6 +94,7 @@ GraphIEC = 1
 //i2cLcdFlip = 1 // Rotate i2c LCD screen 180 degrees
 //i2cLcdOnContrast = 127 // Allows you to adjust the contrast on your i2c LCD screen
 //i2cScan = 1 // scan i2c bus and display addresses on screen
+//i2cLcdUseCBMChar = 0 // set it to 1 to use CBM font on LCD. Small but fun !
 
 //QuickBoot = 0		// faster startup
 //ShowOptions = 0	// display some options on startup screen 

src/FileBrowser.cpp

@@ -82,7 +82,7 @@ void FileBrowser::BrowsableListView::RefreshLine(u32 entryIndex, u32 x, u32 y, b
 	if (entryIndex < list->entries.size())
 	{
 		FileBrowser::BrowsableList::Entry* entry = &list->entries[entryIndex];
-		if (screen->IsMonocrome())
+		if (screen->IsLCD())
 		{
 			// pre-clear line on OLED
 			memset(buffer1, ' ', columnsMax);
@@ -114,9 +114,9 @@ void FileBrowser::BrowsableListView::RefreshLine(u32 entryIndex, u32 x, u32 y, b
 		int len = strlen(buffer2 + highlightScrollOffset);
 		strncpy(buffer1, buffer2 + highlightScrollOffset, sizeof(buffer1));
 
-		if (!screen->IsMonocrome())
+		if (!screen->IsLCD())
 		{
-			// space pad the remainder of the line (but not on OLED==monochrome)
+			// space pad the remainder of the line (but not on OLED)
 			while (len < (int)columnsMax)
 				buffer1[len++] = ' ';
 			buffer1[columnsMax] = 0;
@@ -524,7 +524,7 @@ FileBrowser::FileBrowser(InputMappings* inputMappings, DiskCaddy* diskCaddy, ROM
 	if (screenLCD)
 	{
 		columns = screenLCD->Width() / 8;
-		rows = screenLCD->Height() / 16;
+		rows = screenLCD->Height() / screenLCD->GetFontHeight();
 		positionX = 0;
 		positionY = 0;
 

src/Petscii.h

@@ -24,6 +24,7 @@ static inline u8 ascii2petscii(u8 ch)
 	if (ch > 64 && ch < 91) ch += 128;
 	else if (ch > 96 && ch < 123) ch -= 32;
 	else if (ch > 192 && ch < 219) ch -= 128;
+	else if (ch == 95) ch = 164; // to handle underscore 
 	return ch;
 }
 static inline u8 petscii2ascii(u8 ch)

src/SSD1306.cpp

@@ -19,12 +19,15 @@
 #include "SSD1306.h"
 #include "debug.h"
 #include <string.h>
+#include "Petscii.h"
 
 extern "C"
 {
 #include "xga_font_data.h"
 }
 
+extern unsigned char* CBMFont;
+
 SSD1306::SSD1306(int BSCMaster, u8 address, unsigned width, unsigned height, int flip, LCD_MODEL type)
 	: BSCMaster(BSCMaster)
 	, address(address)
@@ -142,13 +145,13 @@ void SSD1306::RefreshScreen()
 	}
 }
 
-// assumes a text row is 16 bit high
+// assumes a text row is 8 bit high
 void SSD1306::RefreshTextRows(u32 start, u32 amountOfRows)
 {
 	unsigned int i;
 
-	start <<= 1;
+	//start <<= 1;
-	amountOfRows <<= 1;
+	//amountOfRows <<= 1;
 	for (i = start; i < start+amountOfRows; i++)
 	{
 		RefreshPage(i);
@@ -230,14 +233,14 @@ void SSD1306::SetVCOMDeselect(u8 value)
 	SendCommand( (value & 7) << 4 );
 }
 
-void SSD1306::PlotText(int x, int y, char* str, bool inverse)
+void SSD1306::PlotText(bool useCBMFont, bool petscii, int x, int y, char* str, bool inverse)
 {
 // assumes 16 character width
 	int i;
 	i = 0;
 	while (str[i] && x < 16)
 	{
-		PlotCharacter(x++, y, str[i++], inverse);
+		PlotCharacter(useCBMFont, petscii, x++, y, str[i++], inverse);
 	}
 }
 
@@ -268,15 +271,27 @@ void transpose8(unsigned char* B, const unsigned char* A, bool inverse)
 	B[4] = y >> 24; B[5] = y >> 16; B[6] = y >> 8; B[7] = y;
 }
 
-void SSD1306::PlotCharacter(int x, int y, char c, bool inverse)
+void SSD1306::PlotCharacter(bool useCBMFont, bool petscii, int x, int y, char c, bool inverse)
 {
 	unsigned char a[8], b[8];
+	if (useCBMFont && CBMFont)
+	{
+		if (! petscii)
+			c = ascii2petscii(c);
+		c = petscii2screen(c);
+		transpose8(a, CBMFont + ((c+256) * 8), inverse); // 256 byte shift to use the maj/min bank
+		memcpy(frame + (y * 128) + (x * 8), a, 8);
+	}
+	else
+	{
 		transpose8(a, avpriv_vga16_font + (c * 16), inverse);
 		transpose8(b, avpriv_vga16_font + (c * 16) + 8, inverse);
 		memcpy(frame + (y * 256) + (x * 8), a, 8);
 		memcpy(frame + (y * 256) + (x * 8) + 128, b, 8);
 	}
 
+}
+
 void SSD1306::PlotPixel(int x, int y, int c)
 {
 	switch (c)

src/SSD1306.h

@@ -77,8 +77,8 @@ public:
 	// 128x64 0x3D or 0x3C (if SA0 is grounded)
 	SSD1306(int BSCMaster = 1, u8 address = 0x3C, unsigned width = 128, unsigned height = 64, int flip = 0, LCD_MODEL type=LCD_UNKNOWN);
 
-	void PlotCharacter(int x, int y, char ascii, bool inverse);
+	void PlotCharacter(bool useCBMFont, bool petscii, int x, int y, char ascii, bool inverse);
-	void PlotText(int x, int y, char* str, bool inverse);
+	void PlotText(bool useCBMFont, bool petscii, int x, int y, char* str, bool inverse);
 
 	void InitHardware();
 	void DisplayOn();

src/ScreenBase.h

@@ -74,6 +74,9 @@ public:
 	virtual void SwapBuffers() = 0;
 	virtual void RefreshRows(u32 start, u32 amountOfRows) {}
 
+	virtual bool IsLCD() { return false; };
+	virtual bool UseCBMFont() { return false; };
+
 	bool IsMonocrome() const { return bpp == 1; }
 
 protected:

src/ScreenLCD.cpp

@@ -23,7 +23,9 @@
 #include "debug.h"
 #include "ssd_logo.h"
 
-void ScreenLCD::Open(u32 widthDesired, u32 heightDesired, u32 colourDepth, int BSCMaster, int LCDAddress, int LCDFlip, LCD_MODEL LCDType)
+extern unsigned char* CBMFont;
+
+void ScreenLCD::Open(u32 widthDesired, u32 heightDesired, u32 colourDepth, int BSCMaster, int LCDAddress, int LCDFlip, LCD_MODEL LCDType, bool luseCBMFont)
 {
 	bpp = 1;
 
@@ -38,6 +40,7 @@ void ScreenLCD::Open(u32 widthDesired, u32 heightDesired, u32 colourDepth, int B
 
 	width = widthDesired;
 	height = heightDesired;
+	useCBMFont = luseCBMFont;
  
 	ssd1306 = new SSD1306(BSCMaster, LCDAddress, width, height, LCDFlip, LCDType);
 	ssd1306->ClearScreen();
@@ -100,7 +103,7 @@ void ScreenLCD::PlotRawImage(const u8* image, int x, int y, int w, int h)
 u32 ScreenLCD::PrintText(bool petscii, u32 x, u32 y, char *ptr, RGBA TxtColour, RGBA BkColour, bool measureOnly, u32* width, u32* height)
 {
 	int len = 0;
-	ssd1306->PlotText(x >> 3, y >> 4, ptr, (BkColour & 0xffffff) != 0);
+	ssd1306->PlotText(UseCBMFont(), petscii, x >> 3, y >> 4, ptr, (BkColour & 0xffffff) != 0);
 	return len;
 }
 
@@ -111,6 +114,9 @@ u32 ScreenLCD::MeasureText(bool petscii, char *ptr, u32* width, u32* height)
 
 u32 ScreenLCD::GetFontHeight()
 {
+	if (CBMFont && useCBMFont)
+		return 8;
+	else
 		return 16;
 }
 
@@ -127,5 +133,20 @@ void ScreenLCD::SwapBuffers()
 void ScreenLCD::RefreshRows(u32 start, u32 amountOfRows)
 {
 	if (ssd1306)
+	{
+	if (UseCBMFont())
 		ssd1306->RefreshTextRows(start, amountOfRows);
+	else
+		ssd1306->RefreshTextRows(start*2, amountOfRows*2);   
+	}
+}
+
+bool ScreenLCD::IsLCD()
+{
+	return true;
+}
+
+bool ScreenLCD::UseCBMFont()
+{
+	return (CBMFont && useCBMFont);
 }

src/ScreenLCD.h

@@ -33,7 +33,7 @@ public:
 	{
 	}
 
-	void Open(u32 width, u32 height, u32 colourDepth, int BSCMaster, int LCDAddress, int LCDFlip, LCD_MODEL LCDType);
+	void Open(u32 width, u32 height, u32 colourDepth, int BSCMaster, int LCDAddress, int LCDFlip, LCD_MODEL LCDType, bool luseCBMFont);
 
 	void DrawRectangle(u32 x1, u32 y1, u32 x2, u32 y2, RGBA colour);
 	void Clear(RGBA colour);
@@ -59,9 +59,11 @@ public:
 	void RefreshScreen();
 
 	void RefreshRows(u32 start, u32 amountOfRows);
-
+	bool IsLCD();
+	bool UseCBMFont();
 private:
 	SSD1306* ssd1306 = 0;
+	bool useCBMFont;
 };
 
 #endif

src/main.cpp

@@ -117,6 +117,7 @@ u16 pc;
 
 unsigned int screenWidth = 1024;
 unsigned int screenHeight = 768;
+int i2cLcdUseCBMChar = 0;
 
 const char* termainalTextRed = "\E[31m";
 const char* termainalTextNormal = "\E[0m";
@@ -250,6 +251,7 @@ void InitialiseLCD()
 	int i2cLcdOnContrast = options.I2CLcdOnContrast();
 	int i2cLcdDimContrast = options.I2CLcdDimContrast();
 	int i2cLcdDimTime = options.I2CLcdDimTime();
+  i2cLcdUseCBMChar = options.I2cLcdUseCBMChar();
 	LCD_MODEL i2cLcdModel = options.I2CLcdModel();
 
 	if (i2cLcdModel)
@@ -259,7 +261,7 @@ void InitialiseLCD()
 		if (i2cLcdModel == LCD_1306_128x32)
 			height = 32;
 		screenLCD = new ScreenLCD();
-		screenLCD->Open(width, height, 1, i2cBusMaster, i2cLcdAddress, i2cLcdFlip, i2cLcdModel);
+		screenLCD->Open(width, height, 1, i2cBusMaster, i2cLcdAddress, i2cLcdFlip, i2cLcdModel, i2cLcdUseCBMChar);
 		screenLCD->SetContrast(i2cLcdOnContrast);
 		screenLCD->ClearInit(0); // sh1106 needs this
 
@@ -268,7 +270,7 @@ void InitialiseLCD()
 		{
 			screenLCD->PlotRawImage(logo_ssd_1541ii, 0, 0, width, height);
 			snprintf(tempBuffer, tempBufferSize, "Pi1541 V%d.%02d", versionMajor, versionMinor);
-			screenLCD->PrintText(0, 16, 0, tempBuffer, 0xffffffff);
+			screenLCD->PrintText(false, 16, 0, tempBuffer, 0xffffffff);
 			logo_done = true;
 		}
 		else if (( height == 64) && (strcasecmp(options.GetLcdLogoName(), "1541classic") == 0) )
@@ -297,7 +299,7 @@ void InitialiseLCD()
 			snprintf(tempBuffer, tempBufferSize, "Pi1541 V%d.%02d", versionMajor, versionMinor);
 			int x = (width - 8*strlen(tempBuffer) ) /2;
 			int y = (height-16)/2;
-			screenLCD->PrintText(0, x, y, tempBuffer, 0x0);
+			screenLCD->PrintText(false, x, y, tempBuffer, 0x0);
 		}
 		screenLCD->RefreshScreen();
 	}
@@ -1343,6 +1345,8 @@ void DisplayOptions(int y_pos)
 	screen.PrintText(false, 0, y_pos += 16, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
 	snprintf(tempBuffer, tempBufferSize, "AutoBaseName = %s\r\n", options.GetAutoBaseName());
 	screen.PrintText(false, 0, y_pos += 16, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
+	snprintf(tempBuffer, tempBufferSize, "I2cLcdUseCBMChar = %d\r\n", i2cLcdUseCBMChar);
+	screen.PrintText(false, 0, y_pos += 16, tempBuffer, COLOUR_WHITE, COLOUR_BLACK);
 }
 
 void DisplayI2CScan(int y_pos)

src/options.cpp

@@ -148,6 +148,7 @@ Options::Options(void)
 	, i2cLcdFlip(0)
 	, i2cLcdOnContrast(127)
 	, i2cLcdModel(LCD_UNKNOWN)
+	, i2cLcdUseCBMChar(0)
 	, scrollHighlightRate(0.125f)
 	, keyboardBrowseLCDScreen(0)
         , buttonEnter(1)
@@ -235,6 +236,7 @@ void Options::Process(char* buffer)
 		ELSE_CHECK_DECIMAL_OPTION(i2cLcdOnContrast)
 		ELSE_CHECK_DECIMAL_OPTION(i2cLcdDimContrast)
 		ELSE_CHECK_DECIMAL_OPTION(i2cLcdDimTime)
+		ELSE_CHECK_DECIMAL_OPTION(i2cLcdUseCBMChar)
 		ELSE_CHECK_FLOAT_OPTION(scrollHighlightRate)
 		ELSE_CHECK_DECIMAL_OPTION(keyboardBrowseLCDScreen)
 		ELSE_CHECK_DECIMAL_OPTION(buttonEnter)

src/options.h

@@ -75,7 +75,6 @@ public:
 
 	inline unsigned int LowercaseBrowseModeFilenames() const { return lowercaseBrowseModeFilenames; }
 	
-
 	inline unsigned int ScreenWidth() const { return screenWidth; }
 	inline unsigned int ScreenHeight() const { return screenHeight; }
 
@@ -86,6 +85,7 @@ public:
 	inline unsigned int I2CLcdOnContrast() const { return i2cLcdOnContrast; }
 	inline unsigned int I2CLcdDimContrast() const { return i2cLcdDimContrast; }
 	inline unsigned int I2CLcdDimTime() const { return i2cLcdDimTime; }
+	inline unsigned int I2cLcdUseCBMChar() const { return i2cLcdUseCBMChar; }
 	inline LCD_MODEL I2CLcdModel() const { return i2cLcdModel; }
 
 	inline const char* GetLcdLogoName() const { return LcdLogoName; }
@@ -141,6 +141,7 @@ private:
 	unsigned int i2cLcdOnContrast;
 	unsigned int i2cLcdDimContrast;
 	unsigned int i2cLcdDimTime;
+	unsigned int i2cLcdUseCBMChar;
 	LCD_MODEL i2cLcdModel = LCD_UNKNOWN;
 
 	float scrollHighlightRate;