lcd1602.c

ARM LPC2114 LCD1602源码

/*************************************
功能：采用ARM7--LPC2114的GPIO口控制LCD1602显示
接线：P0.0~P0.7接D0~D7
      P0.8~P0.9,P0.12接RS，RW，E
作者：alexcheng1120
日期：2008-4-22      
*************************************/
#include "config.h"

#define LCD_RS   0x00000100 //P0.8接RS
#define LCD_RW   0x00000200 //P0.9接RW
#define LCD_E    0x00001000 //P0.12接E
#define LCD_BUSY 0x00000080

void Delayms(uint32 count)
{
 uint32 i;
 for(i=0;i<count;i++);
}


void LCD_ChkBusy(void)
{

	IO0DIR=0x00001300;

	IO0CLR=LCD_RS;
	IO0SET=LCD_RW;
	IO0SET=LCD_E;
	while((IO0PIN&LCD_BUSY)!=0);
	Delayms(400);
	IO0CLR=LCD_E;

	IO0DIR=0x000013ff;

}


void LCD_WriteCommand(uint8 cmd,uint8 busyc)
{
  if(busyc) LCD_ChkBusy();
 
  IO0CLR=LCD_E;
  IO0CLR=LCD_RS;
  IO0CLR=LCD_RW;
  IO0CLR=0x000000ff;  //清零数据位D0-D7
  IO0SET=cmd;
  IO0SET=LCD_E;       //LCD使能
  Delayms(400);
  IO0CLR=LCD_E; 
}

void LCD_WriteData(uint8 dat)
{
  LCD_ChkBusy();
  
  IO0CLR=LCD_E;
  IO0SET=LCD_RS;
  IO0CLR=LCD_RW;
  IO0CLR=0x000000ff;
  IO0SET=dat;
  IO0SET=LCD_E;
  Delayms(400);
  IO0CLR=LCD_E; 
}

void LCD_Init()
{
 Delayms(1000);
 LCD_WriteCommand(0x38,0);//三次显示模式设置，不检测忙信号
 Delayms(400);
 LCD_WriteCommand(0x38,0);
 Delayms(400);
 LCD_WriteCommand(0x38,0);
 Delayms(2800);
 LCD_WriteCommand(0x38,1);//显示模式设置，开始要求检测忙信号：8位、2行、5X7点阵
 Delayms(2800);
 LCD_WriteCommand(0x08,1);//关闭显示
 Delayms(2800);
 LCD_WriteCommand(0x01,1);//清屏
 Delayms(2800);
 LCD_WriteCommand(0x06,1);//显示光标移动设置：文字不动，光标自动右移
 Delayms(2800);
 LCD_WriteCommand(0x0C,1);//显示开及光标设置：光标关、光标不闪烁
}

void LCD_SetPointion(uint8 x)
{
   LCD_WriteCommand(x|0x80,0);
}

void LCD_PrintChar(uint8 lcd_data)          //输出一个字符到LCD
{
   LCD_WriteData(lcd_data);
}

void LCD_PrintString(uint8 *lcd_string)       //输出一个字符串到LCD
{
 uint8 i=0;
 while(lcd_string[i]!=0x00)
  {
   LCD_WriteData(lcd_string[i]);
   i++;
  } 
}


int main()
{ 
	uint8 Text1[]="Nice to See You!";
	uint8 Text2[]="  QQ: 52626392  ";
	
    PINSEL0=0x00000000;
    IO0DIR =0x000013ff;

 LCD_Init();
 while(1)
 {
    LCD_SetPointion(0);
    LCD_PrintString(Text1);
    LCD_SetPointion(0x40);
    LCD_PrintString(Text2); 
 }
}