lcd.c

图形点阵液晶模块相关的各种面板大小驱动程序。

		outb(LCD_DATA_POUT, (inb(LCD_DATA_POUT)&0x0F) | (data<<4) );	// output data, low 4 bits
		LCD_DELAY;								// wait
		LCD_DELAY;								// wait
		cbi(LCD_CTRL_PORT, LCD_CTRL_E);	// clear "E" line
	#else
		// 8 bit write
		sbi(LCD_CTRL_PORT, LCD_CTRL_E);	// set "E" line
		outb(LCD_DATA_DDR, 0xFF);			// set data I/O lines to output (8bit)
		outb(LCD_DATA_POUT, data);			// output data, 8bits
		LCD_DELAY;								// wait
		LCD_DELAY;								// wait
		cbi(LCD_CTRL_PORT, LCD_CTRL_E);	// clear "E" line
	#endif
	//	leave data lines in input mode so they can be most easily used for other purposes
	#ifdef LCD_DATA_4BIT
		outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&0x0F);		// set data I/O lines to input (4bit)
		outb(LCD_DATA_POUT, inb(LCD_DATA_POUT)|0xF0);	// set pull-ups to on (4bit)
	#else
		outb(LCD_DATA_DDR, 0x00);			// set data I/O lines to input (8bit)
		outb(LCD_DATA_POUT, 0xFF);			// set pull-ups to on (8bit)
	#endif
#else
	// memory bus write
	//sbi(MCUCR, SRW);			// enable RAM waitstate
	lcdBusyWait();				// wait until LCD not busy
	*((volatile unsigned char *) (LCD_DATA_ADDR)) = data;
	//cbi(MCUCR, SRW);			// disable RAM waitstate
#endif
}

u08 lcdDataRead(void)
{
// read a data byte from the display
	register u08 data;
#ifdef LCD_PORT_INTERFACE
	lcdBusyWait();				// wait until LCD not busy
	#ifdef LCD_DATA_4BIT
		outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&0x0F);		// set data I/O lines to input (4bit)
		outb(LCD_DATA_POUT, inb(LCD_DATA_POUT)|0xF0);	// set pull-ups to on (4bit)
	#else
		outb(LCD_DATA_DDR, 0x00);			// set data I/O lines to input (8bit)
		outb(LCD_DATA_POUT, 0xFF);			// set pull-ups to on (8bit)
	#endif
	sbi(LCD_CTRL_PORT, LCD_CTRL_RS);		// set RS to "data"
	sbi(LCD_CTRL_PORT, LCD_CTRL_RW);		// set R/W to "read"
	#ifdef LCD_DATA_4BIT
		// 4 bit read
		sbi(LCD_CTRL_PORT, LCD_CTRL_E);	// set "E" line
		LCD_DELAY;								// wait
		LCD_DELAY;								// wait
		data = inb(LCD_DATA_PIN)&0xF0;	// input data, high 4 bits
		cbi(LCD_CTRL_PORT, LCD_CTRL_E);	// clear "E" line
		LCD_DELAY;								// wait
		LCD_DELAY;								// wait
		sbi(LCD_CTRL_PORT, LCD_CTRL_E);	// set "E" line
		LCD_DELAY;								// wait
		LCD_DELAY;								// wait
		data |= inb(LCD_DATA_PIN)>>4;			// input data, low 4 bits
		cbi(LCD_CTRL_PORT, LCD_CTRL_E);	// clear "E" line
	#else
		// 8 bit read
		sbi(LCD_CTRL_PORT, LCD_CTRL_E);	// set "E" line
		LCD_DELAY;								// wait
		LCD_DELAY;								// wait
		data = inb(LCD_DATA_PIN);			// input data, 8bits
		cbi(LCD_CTRL_PORT, LCD_CTRL_E);	// clear "E" line
	#endif
	//	leave data lines in input mode so they can be most easily used for other purposes
#else
	// memory bus read
	//sbi(MCUCR, SRW);			// enable RAM waitstate
	lcdBusyWait();				// wait until LCD not busy
	data = *((volatile unsigned char *) (LCD_DATA_ADDR));
	//cbi(MCUCR, SRW);			// disable RAM waitstate
#endif
	return data;
}



/*************************************************************/
/********************* PUBLIC FUNCTIONS **********************/
/*************************************************************/

void lcdInit()
{
	// initialize hardware
	lcdInitHW();
	// LCD function set
	lcdControlWrite(LCD_FUNCTION_DEFAULT);
	// clear LCD
	lcdControlWrite(1<<LCD_CLR);
	delay(60000);	// wait 60ms
	// set entry mode
	lcdControlWrite(1<<LCD_ENTRY_MODE | 1<<LCD_ENTRY_INC);
	// set display to on
	//lcdControlWrite(1<<LCD_ON_CTRL | 1<<LCD_ON_DISPLAY | 1<<LCD_ON_BLINK);
	lcdControlWrite(1<<LCD_ON_CTRL | 1<<LCD_ON_DISPLAY );
	// move cursor to home
	lcdControlWrite(1<<LCD_HOME);
	// set data address to 0
	lcdControlWrite(1<<LCD_DDRAM | 0x00);

	// load the first 8 custom characters
	lcdLoadCustomChar((u08*)LcdCustomChar,0,0);
	lcdLoadCustomChar((u08*)LcdCustomChar,1,1);
	lcdLoadCustomChar((u08*)LcdCustomChar,2,2);
	lcdLoadCustomChar((u08*)LcdCustomChar,3,3);
	lcdLoadCustomChar((u08*)LcdCustomChar,4,4);
	lcdLoadCustomChar((u08*)LcdCustomChar,5,5);
	lcdLoadCustomChar((u08*)LcdCustomChar,6,6);
	lcdLoadCustomChar((u08*)LcdCustomChar,7,7);
}

void lcdHome(void)
{
	// move cursor to home
	lcdControlWrite(1<<LCD_HOME);
}

void lcdClear(void)
{
	// clear LCD
	lcdControlWrite(1<<LCD_CLR);
}

void lcdGotoXY(u08 x, u08 y)
{
	register u08 DDRAMAddr;

	// remap lines into proper order
	switch(y)
	{
	case 0: DDRAMAddr = LCD_LINE0_DDRAMADDR+x; break;
	case 1: DDRAMAddr = LCD_LINE1_DDRAMADDR+x; break;
	case 2: DDRAMAddr = LCD_LINE2_DDRAMADDR+x; break;
	case 3: DDRAMAddr = LCD_LINE3_DDRAMADDR+x; break;
	default: DDRAMAddr = LCD_LINE0_DDRAMADDR+x;
	}

	// set data address
	lcdControlWrite(1<<LCD_DDRAM | DDRAMAddr);
}

void lcdLoadCustomChar(u08* lcdCustomCharArray, u08 romCharNum, u08 lcdCharNum)
{
	register u08 i;
	u08 saveDDRAMAddr;

	// backup the current cursor position
	saveDDRAMAddr = lcdControlRead() & 0x7F;

	// multiply the character index by 8
	lcdCharNum = (lcdCharNum<<3);	// each character occupies 8 bytes
	romCharNum = (romCharNum<<3);	// each character occupies 8 bytes

	// copy the 8 bytes into CG (character generator) RAM
	for(i=0; i<8; i++)
	{
		// set CG RAM address
		lcdControlWrite((1<<LCD_CGRAM) | (lcdCharNum+i));
		// write character data
		lcdDataWrite( PRG_RDB(lcdCustomCharArray+romCharNum+i) );
	}

	// restore the previous cursor position
	lcdControlWrite(1<<LCD_DDRAM | saveDDRAMAddr);

}

void lcdPrintData(char* data, u08 nBytes)
{
	register u08 i;

	// check to make sure we have a good pointer
	if (!data) return;

	// print data
	for(i=0; i<nBytes; i++)
	{
		lcdDataWrite(data[i]);
	}
}

void lcdProgressBar(u16 progress, u16 maxprogress, u08 length)
{
	u08 i;
	u32 pixelprogress;
	u08 c;

	// draw a progress bar displaying (progress / maxprogress)
	// starting from the current cursor position
	// with a total length of "length" characters
	// ***note, LCD chars 0-5 must be programmed as the bar characters
	// char 0 = empty ... char 5 = full

	// total pixel length of bargraph equals length*PROGRESSPIXELS_PER_CHAR;
	// pixel length of bar itself is
	pixelprogress = ((progress*(length*PROGRESSPIXELS_PER_CHAR))/maxprogress);
	
	// print exactly "length" characters
	for(i=0; i<length; i++)
	{
		// check if this is a full block, or partial or empty
		// (u16) cast is needed to avoid sign comparison warning
		if( ((i*(u16)PROGRESSPIXELS_PER_CHAR)+5) > pixelprogress )
		{
			// this is a partial or empty block
			if( ((i*(u16)PROGRESSPIXELS_PER_CHAR)) > pixelprogress )
			{
				// this is an empty block
				// use space character?
				c = 0;
			}
			else
			{
				// this is a partial block
				c = pixelprogress % PROGRESSPIXELS_PER_CHAR;
			}
		}
		else
		{
			// this is a full block
			c = 5;
		}
		
		// write character to display
		lcdDataWrite(c);
	}

}