lcd.c

Freescale单片机mc68hc908ap32读写字符液晶2004（驱动器为SA0069）的程序

/*
DISPLAY REGISTER
+------+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+LINE 0|00|01|02|03|04|05|06|07|08|09|0A|0B|0C|0D|0E|0F|10|11|12|13|
+------+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+LINE 1|40|41|42|43|44|45|46|47|48|49|4A|4B|4C|4D|4E|4F|50|51|52|53|
+------+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+LINE 2|14|15|16|17|18|19|1A|1B|1C|1D|1E|1F|20|21|22|23|24|25|26|27|
+------+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+LINE 3|54|55|56|57|58|59|5A|5B|5C|5D|5E|5F|60|61|62|63|64|65|66|67|
+------+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
*/

#include "lcd.h"

#define LCD_RS	PTB_PTB4	//PTA_PTA0
#define LCD_RW	PTC_PTC1
#define LCD_E	PTC_PTC0

INT8U BusyDetection(void)
{
	DDRD = 0x00;			// configure PORTD as input
	LCD_RS = 0;				// RS = 0
	LCD_RW = 1;				// RW = 1
	LCD_E = 1;				// E = 1, enable LCD controller
	BF = PTD & 0x80;		// read busy flag
	LCD_E = 0;				// E = 0; Disable LCD controller
	return BF;  
}

void SendInstruction(INT8U instruction)
{
	while(BusyDetection());
	DDRD = 0xFF;			// configure PORTD as output
	LCD_RS = 0;				// RS = 0
	LCD_RW = 0;				// RW = 0;
	PTD	 = instruction;
	LCD_E = 1;				// E = 1; enable LCD controller
	LCD_E = 0;				// E = 0; Disable LCD controller
}

void SendData(INT8U data)
{
	while(BusyDetection());
	DDRD = 0xFF;			// configure PORTD as output
	LCD_RS = 1;				// RS = 1
	LCD_RW = 0;				// RW = 0;
	PTD	 = data;
	LCD_E = 1;				// E = 1; enable LCD controller
	LCD_E = 0;				// E = 0; Disable LCD controller
}

void InitializeLCD(void)
{
	SendInstruction(0x38);	// 8 bit bus mode, 2 line display mode, 5*7 font
	SendInstruction(0x38);
    SendInstruction(0x0C);	// display on, cursor off, blink off
	SendInstruction(0x01);	// clear screen, curse return home
	SendInstruction(0x1E);	// increment mode, entire shift off
}

void LoadTemplate(INT8U page[2][40])
{
	for(line = 0; line < 2; line++)
	{
		for(row = 0; row < 40; row++)
		{
			displayBuffer[line][row] = page[line][row];
		}
	}
}

void UpdateWholeScreen(void)
{
	SendInstruction(0x01);
	for(row = 0; row < 40; row++)
	{
		SendData(displayBuffer[0][row]);
	}
	SendInstruction(0xC0);
	for(row = 0; row < 40; row++)
	{
		SendData(displayBuffer[1][row]);
	}
}

void UpdateSingleCell(INT8U address, INT8U context)
{
	SendInstruction(address | 0x80);	// set address
	SendData(context);
}

void UpdateMultiCell(INT8U address, INT8U length, INT8U context[])
{
	SendInstruction(address | 0x80);
	for(row = 0; row < length; row++)
	{
		SendData(context[row]);
	}
}