lcd.c.svn-base

AVR单片机下

/*                ****ROBOCON 2009 | BUPT TEAM*******
 * ------------------------------------------------------------------------
 * FileName   : lcd.c
 * Version    : 1.0
 * Brief      :
 * Code by    : Leaf
 * Date       : Tue Mar 31 00:04:43 2009
 * Note       :
 *
 *
 * ------------------------------------------------------------------------
 */



#include "lib_bupt.h"

#ifdef  LCD_H_INCLUDED
#define LCD_DELAY_INIT 15
#define LCD_DELAY_DATA 40
#define LCD_DELAY_EN   10
static void lcdWriteEn();
static LcdConnType lcdConnType = LCD_CONN_TYPE;
static UINT8       lcdDataMask;
#ifdef _STDIO_H_

/*LCD的文件操作，使可以在lcd显示时可以使用fprintf*/
UINT8 lcdCurLine;
FILE  *lcd;
int lcd_putchar(char c, FILE *strean){
	if(c == '\n' || c == '\r'){
		lcdSetXy(0, !lcdCurLine);
		return 0;
	}
	lcdSendData(c);
	return 0;
}
#endif

/*LCD 发送数据的函数，根据不同的连接执行不同的动作*/
void lcd_trans(UINT8 data){
	if(lcdConnType == LCD_CONNTYPE_L4){
		UINT8 half;
		half = data >> 4;            //get higher 4 bits
		LCD_DATA_PORT &= 0xf0;       //clear 4-bits send port
		LCD_DATA_PORT |= half;       //send higher 4-bits
		lcdWriteEn();
		half = data & 0x0f;          //get lower 4 bits
		LCD_DATA_PORT &= 0xf0;       //clear 4-bits send port
		LCD_DATA_PORT |= half;       //send lower 4-bits
		lcdWriteEn();
	}
	else if(lcdConnType == LCD_CONNTYPE_H4){
		UINT8 half;
		half = data & 0xf0;          //get higher half
		LCD_DATA_PORT &= 0x0f;       //clear 4-bits send port
		LCD_DATA_PORT |= half;       //send higher half
		lcdWriteEn();
		half = data << 4;            //get lower half
		LCD_DATA_PORT &= 0x0f;       //clear 4-bits send port
		LCD_DATA_PORT |= half;       //send lower half
		lcdWriteEn();
	}
	else if(lcdConnType == LCD_CONNTYPE_8){
		LCD_DATA_PORT = data;
		lcdWriteEn();
	}
}

/*初始化，液晶寝化时要发一串串的指令*/
void lcdInit(void)         //Һ����ʼ��
{
	unsigned char i;
	if(lcdConnType == LCD_CONNTYPE_L4){
		lcdDataMask = 0x0f;
	}else if(lcdConnType == LCD_CONNTYPE_H4){
		lcdDataMask = 0xf0;
	}else if(lcdConnType == LCD_CONNTYPE_8){
		lcdDataMask = 0xff;
	}
	LCD_DATA_DDR |= lcdDataMask;
	LCD_EN_DDR|=LCD_EN;       //����EN�������
	LCD_RS_DDR|=LCD_RS;       //����RS�������
	if(lcdConnType == LCD_CONNTYPE_8){
		lcdSendCommand(0x38);
	}
	else{
		lcdSendCommand(0x28);
	}
	lcdWriteEn();
	_delay_us(LCD_DELAY_INIT);
	if(lcdConnType == LCD_CONNTYPE_8){
		lcdSendCommand(0x38);
	}
	else{
		lcdSendCommand(0x28);
	}
	for (i=0;i<20;i++)
	{
		if(lcdConnType == LCD_CONNTYPE_8){
			lcdPosChar(0,0,0x38); //4bit test
		}
		else{
			lcdPosChar(0,0,0x28); //4bit test
		}
		_delay_ms(LCD_DELAY_INIT);
	}
	lcdSendCommand(0x0c);  //显示开
	lcdSendCommand(0x01);  //清屏
	_delay_ms(LCD_DELAY_INIT);
#ifdef _STDIO_H_
	lcd = fdevopen(lcd_putchar, NULL);
#endif
}

/*在LCD的EN脚上产生一个下降沿*/
static void lcdWriteEn(void)
{
	LCD_EN_PORT|=LCD_EN;
	_delay_us(LCD_DELAY_EN);
	LCD_EN_PORT&=~LCD_EN;
}

/*向lcd发个指令*/
void lcdSendCommand(unsigned char command)
{
	_delay_us(LCD_DELAY_DATA);
	LCD_RS_PORT&=~LCD_RS;        //RS=0
	lcd_trans(command);
}

/*向lcd发个数据*/
void lcdSendData(unsigned char data)
{
	_delay_us(LCD_DELAY_DATA);
	LCD_RS_PORT|=LCD_RS;       //RS=1
	lcd_trans(data);
}

/*设置光标位置*/
void lcdSetXy( unsigned char x, unsigned char y )
{
	unsigned char address;
#ifdef _STDIO_H_
	lcdCurLine = y;
#endif
	if (y == 0) address = 0x80 + x;
	else   address = 0xc0 + x;
	lcdSendCommand( address);
}

/*写个字符*/
void inline lcdPutc(const char c){
	lcdSendData(c);
}

/*写字串，\0 结尾*/
void lcdPuts(const char *s){
	while (*s)
	{
		lcdPutc( *s );
		s ++;
	}
}

/*向指定的位置写个字符*/
void inline lcdPosChar(unsigned char X,unsigned char Y, char data)
{
	lcdSetXy( X, Y );
	lcdSendData( data);
}

/*向指定的位置写个字串*/
void inline lcdPosString(unsigned char X,unsigned char Y,const char *s)
{
	lcdSetXy( X, Y );
	lcdPuts(s);
}

#endif