lcd1602.c

基于ARM7的液晶显示程序

/*************************************
功能：采用ARM7的GPIO口控制LCD1602显示
目的：彻底玩透ARM7的GPIO口
接线：P0.0~P0.7接D0~D7
      P0.8~P0.10接RS，RW，E
作者：刘启明
更新：2007年1月20日
*************************************/
#include "IOLPC2132.h"
#include "string.h"

#define RS 0x00000100 //P0.8接RS
#define RW 0x00000200 //P0.9接RW
#define E  0x00000400 //P0.10接E

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

void WriteCommand(unsigned char Com)
{
  IO0CLR=E;
  IO0CLR=RS;IO0CLR=RW;IO0SET=E;
  IO0CLR=0x000000ff;IO0SET=Com;
  IO0CLR=E; IO0CLR=RS;IO0CLR=RW;
}

void WriteData(unsigned char Dat)
{
  IO0CLR=E;
  IO0SET=RS; IO0CLR=RW;IO0SET=E;
  IO0CLR=0x000000ff;IO0SET=Dat;
  IO0CLR=E;  IO0CLR=RS;IO0CLR=RW;
}

void Init()
{
	Delayms(1000);
	WriteCommand(0x38);
	Delayms(400);
	WriteCommand(0x38);
	Delayms(400);
	WriteCommand(0x38);
	Delayms(2800);
	WriteCommand(0x38);
	Delayms(2800);
	WriteCommand(0x08);
	Delayms(2800);
	WriteCommand(0x01);
	Delayms(2800);
	WriteCommand(0x06);
	Delayms(2800);
	WriteCommand(0x0C);
}

void Show_Text(char *Text,char row)
{
	unsigned char i;
	if(row==0)
	{
		WriteCommand(0x80);
		Delayms(2800);
		for(i=0;i<strlen(Text);i++)
		{
			WriteData(Text[i]);
			Delayms(2800);
		}	
	}
	else
	{
	 	WriteCommand(0xC0);
		Delayms(2800);
		for(i=0;i<strlen(Text);i++)
		{
			WriteData(Text[i]);
			Delayms(2800);
		}
	}
}

void main()
{
        PINSEL0=0x00000000;
        IO0DIR =0xffffffff;
	char Text1[16]="<NIOS II on DE2>";
	char Text2[16]="Nice to See You!";
	Init();
	while(1)
	{
		Show_Text(Text1,0);
		Show_Text(Text2,1);
	}
}