lcd1602_14p.c

来自「飞思卡尔单片机MC9SDG128程序」· C语言 代码 · 共 105 行

/*-------------------------------------------------------
    LCD1602 Module
    Donald
    Apr 30, 2007
-------------------------------------------------------*/
#include <hidef.h>      /* common defines and macros */
#include <mc9s12dg128.h>     /* derivative information */
#include "LCD1602_14P.h"

void LcdInit(){
  DDRH = 0xff;
  DDRE = 0xff;
  LCDIO_DIR = LCDIO_DIR_OUT;
	LcdDelay();
	LcdCommand(CLR,0);          //clear screen 
	LcdCommand(DATA_MODE,1);    //set 8 bit data transmission mode 
	LcdCommand(INPUTMODE_CUR_R | INPUTMODE_ALL_D, 1);   // cursor right, disable moving
	LcdCommand(SCREEN_OPEN 
	  | SCREEN_OPEN_CUR
	  | SCREEN_OPEN_TWI
	  , 1);                     //open display (enable lcd display)
	LcdCommand(LINE1_HEAD,1);   //set lcd first display address 
	LcdCommand(CLR,1);          //clear screen
}

////////////////////////////////////////////////////////////////////
// write command function
//
void LcdCommand(unsigned char command,unsigned char BusyC){
	if (BusyC) ReadStatus(); //Test it busy or not
	LCDIO=command;
	LCD1602_RS=0;   
	LCD1602_RW=0;
	LCD1602_EN=0;
	LCD1602_EN=0;
	LCD1602_EN=1;
}

unsigned char ReadStatus(void)
{
  unsigned char cRtn;
	LCDIO_DIR = LCDIO_DIR_IN;
	LCD1602_RS = 0;
	LCD1602_RW = 1;
	LCD1602_EN = 0;
	LCD1602_EN = 0;
	LCD1602_EN = 1;
	while (LCDIO & BUSY); //Test Busy State
	cRtn = LCDIO_DIR;     // if Not save the port value, it should be change
	LCDIO_DIR = LCDIO_DIR_OUT;
	return(cRtn);
}

void LcdDelay(void){
  word i, j;
  for (i = 0; i < 300; i++)
    for(j = 0; j < 3000; j++);
}

////////////////////////////////////////////////////////////////////
// write data function
//
void LcdData(unsigned char dat,unsigned char BusyC)
{
	if (BusyC) ReadStatus(); //Test it busy or not
	LCDIO=dat;
	LCD1602_RS=1;
	LCD1602_RW=0;
	LCD1602_EN=0;
	LCD1602_EN=0;
	LCD1602_EN=1;
}

////////////////////////////////////////////////////////////////////
// write lcd a character function
//
void LcdWriteChar( unsigned char x,unsigned char y,unsigned char dat){
  LcdSetXY(x, y); 
	LcdData(dat,1);
}

////////////////////////////////////////////////////////////////////
// set display address function
//
void LcdSetXY( unsigned char x, unsigned char y ){
	unsigned char address;
	if (y == LINE1) 
    address = LINE1_HEAD + x;
	else 
    address = LINE2_HEAD + x;
	LcdCommand(address,1); 
}

////////////////////////////////////////////////////////////////////
// write lcd string function
//
void LcdWriteStr(unsigned char X,unsigned char Y,char *s)
{
    LcdSetXY( X, Y ); //set address 
    while (*s)  // write character
    {
      LcdData(*s, 1);   
      s++;
    }
}