lcdtemp.c

一个通过打印机端口[378h]驱动lcd的程序. 并可通过ds1620测量温度,最后把结果在lcd中输出.

#include "lcdtemp.h"


void tme_tempo(int d)
{
	usleep(d*1000);
}

void PORT_INIT(void)
{
	if( ioperm( PORTA ,4,1 ) )
	{
		printf("#Ioperm Error!\n");
		exit(1);
	}
	outb( 0x03, PORTA + 2 );
	tme_tempo(10);
}

void LCD_E_HIGH(void)
{
	unsigned char tmp = inb( PORTA + 2 );
	outb( 0xFE & tmp , PORTA + 2 );
}

void LCD_E_LOW(void)
{
	unsigned char tmp = inb( PORTA + 2 );
	outb( 0X01 | tmp , PORTA + 2 );
}

void LCD_RS_HIGH(void)
{
	unsigned char tmp = inb( PORTA + 2 );
	outb( 0xFD & tmp , PORTA + 2 );
}

void LCD_RS_LOW(void)
{
	unsigned char tmp = inb( PORTA + 2 );
	outb( 0X02 | tmp , PORTA + 2 );
}

void LCD_DATA(unsigned char data)
{
	outb(data,PORTA);
	tme_tempo(1);
	LCD_RS_HIGH();
	tme_tempo(1);
	LCD_E_HIGH();
	tme_tempo(1);
	LCD_E_LOW();
	tme_tempo(1);
}

void LCD_CMD(unsigned char cmd)
{
	outb(cmd,PORTA);
	tme_tempo(1);
	LCD_RS_LOW();
	tme_tempo(1);
	LCD_E_HIGH();
	tme_tempo(1);
	LCD_E_LOW();
	tme_tempo(1);
}

void LCD_STRING(unsigned char * pdata)
{
	while( *pdata )
		LCD_DATA( *pdata++ );
}

void LCD_CLEAR(void)
{
	LCD_CMD( 0x01 );
	tme_tempo(2);
}

void LCD_HOME(void)
{
	LCD_CMD( 0x02 );
	tme_tempo(2);
}

void LCD_INIT(void)
{
	LCD_CMD( 0x38 );
	LCD_CMD( 0x38 );
	LCD_CMD( 0x38 );
	LCD_CMD( 0x0c );
	LCD_CMD( 0x06 );
	LCD_CLEAR();
}