780._c

ATmega系列单片机驱动1602字符型液晶显示器

// Functions for SPLC780X 16com/40seg LCD Controller and Driver
//#include "idelay.h"
//#include "convert.h"
//#include "780.h"
// PORT initialization
/*void port_ini(void)
{
	LCD_CTRL_DDR = 0x07;
	LCD_DATA_DDR = 0xFF;
}*/

//Busy check
void CheckBusy()
{
	//uint8 readByte;
	LCD_DATA_DDR = 0x00;
	CLR_RS;
	SET_RW;
	#ifdef LCD_4BIT
		SET_E;
		LCD_DO = dByte & 0xF0;	//Higher 4-bit
		//DelayUs(50);
		CLR_E;
		//DelayUs(50);
		SET_E;
		LCD_DO = dByte << 4;	//Lower 4-bit
		//DelayUs(50);
		CLR_E;
	#elif defined(LCD_8BIT)
		SET_E;
		while((LCD_DI&0x80)==0x80);
		//DelayUs(50);
		CLR_E;
	#endif
}
// Write a Data or Command to LCD
void SendByte(uint8 DatCmd, uint8 dByte)
{
	CheckBusy();
	
	LCD_DATA_DDR = 0xFF;
	if (DatCmd == 0)
		CLR_RS;
	else
		SET_RS;
	CLR_RW;
	#ifdef LCD_4BIT
		SET_E;
		LCD_DO = dByte & 0xF0;	//Higher 4-bit
		//DelayUs(50);
		CLR_E;
		//DelayUs(50);
		SET_E;
		LCD_DO = dByte << 4;	//Lower 4-bit
		//DelayUs(50);
		CLR_E;
	#elif defined(LCD_8BIT)
		SET_E;
		LCD_DO = dByte;
		//DelayUs(50);
		CLR_E;
	#endif
}

// Write a string to LCD
void SendStr(uint8 *ptString)
{
	while((*ptString)!='\0')
	{
		SendByte(iDat, *ptString++);
	}
}

// Send a Number less than 255
void SendNbr(uint8 Number)
{
	uint8 *temp;
	temp = NumberToChar(Number);
	SendByte(iDat, *temp++);
	SendByte(iDat, *temp++);
	SendByte(iDat, *temp);
}
// Move Cursor or display
void Move(uint8 dir)
{
	SendByte(iCmd, dir);
}

// Goto specific location
void Gotoxy(uint8 Row, uint8 Col)
{
	
	switch (Row)
	{
		#if defined(LCD_L2)
		case 2:
			SendByte(iCmd, LCD_L2 + Col); break;
		#endif
		#if defined(LCD_L3)
		case 3:
			SendByte(iCmd, LCD_L3 + Col); break;
		#endif
		#if defined(LCD_L4)
		case 4:
			SendByte(iCmd, LCD_L4 + Col); break;
		#endif
		default:
			SendByte(iCmd, LCD_L1 + Col); break;
	}	
}

// Clear LCD Screen
void Clear(void)
{
	SendByte(iCmd, LCD_CLS);
	//DelayMs(3);
	// 2ms delay is Necessary after sending LCD_CLS command !!!
}

// Wait some time and clear screen
void wait_and_clear(void)
{
	DelayMs(1000);
	Clear();
}

// Fill CGRAM with array CGRAM[]
void FillCGRAM(void)
{
	uint8 i;
	SendByte(iCmd, LCD_CGRAM_ADDR);
	for (i = 0; i < LCD_CGMAX; i++)
	{
		SendByte(iDat, CGRAM[i]);
	}
}

// Show All patterns in CGRAM
void ShowCGRAM(void)
{
	uint8 i,k;
	for (i = 0; i < 8; i++)
	{
		SendByte(iCmd, LCD_L1);
		for (k = 0; k < LCD_CHAR; k++)
		{
			#if defined(LCD_L2)
			switch (k)
			{
				case LCD_COL:
				SendByte(iCmd, LCD_L2); break;
				#if defined(LCD_L3)
				case LCD_COL*2:
				SendByte(iCmd, LCD_L3); break;
				#endif
				#if defined(LCD_L4)
				case LCD_COL*3:
				SendByte(iCmd, LCD_L4); break;
				#endif
				default:
				break;
			}
			#endif
			SendByte(iDat, i);
		}
		wait_and_clear();
	}
}

// Call built-in Charactors
void CallBultinChar(void)
{
	uint8 i, k;
	for (i = 0; i < LCD_COL; i += LCD_ROW)
	{
		SendByte(iCmd, LCD_L1);
		for (k = 0; k < LCD_CHAR; k++)
		{
			#if defined(LCD_L2)
			switch (k)
			{
				case LCD_COL:
				SendByte(iCmd, LCD_L2); break;
				#if defined(LCD_L3)
				case LCD_COL*2:
				SendByte(iCmd, LCD_L3); break;
				#endif
				#if defined(LCD_L4)
				case LCD_COL*3:
				SendByte(iCmd, LCD_L4); break;
				#endif
				default:
				break;
			}
			#endif
			SendByte(iDat, k + LCD_COL*i);
		}
		wait_and_clear();
	}
}
// LCD initialize procedure
void LCD_Initial(void)
{
	delay100ms();				// Wait for internal initialization
	//port_ini();
	LCD_CTRL_DDR = 0x07;
	#ifdef LCD_4BIT
		CLR_RS;
		CLR_RW;
		SET_E;
		LCD_DO = 0x20;	// Set Interface to 4-bit
		//DelayUs(50);
		CLR_E;
	#endif
	SendByte(iCmd, LCD_FUNCTION);	// Function Set
	//DelayUs(50);
	SendByte(iCmd, LCD_ON);
	//DelayUs(50);
	Clear();
	SendByte(iCmd, LCD_ENTRY);	// Entry Mode Set
	/*
	// Display system Info
	#ifdef LCD_4BIT
		Gotoxy(1, 4);
		SendStr("LCD_4BIT");
	#else
		Gotoxy(1, 4);
		SendStr("LCD_8BIT");
	#endif	
	Gotoxy(2,1);
	SendStr("LCD_COLS: ");
	SendNbr(LCD_COL);
	Gotoxy(3,1);
	SendStr("LCD_ROWS: ");
	SendNbr(LCD_ROW);
	Gotoxy(4,1);
	SendStr("LCD_CHAR: ");
	SendNbr(LCD_CHAR);
	wait_and_clear();
	*/
}