lcddriver.c

基于MODBUS协议的串口通信下位机软件的设计

#include "c8051f330.h"

#define LCD_DATA P1		  //P1

sbit RS=P0^0;			  //P3.4
sbit RW=P0^2;			  //P3.5
sbit EN=P0^3;			  //P3.7




void Delay(unsigned int time)
{
	while(time>0)
		time--;
}

//不断检测LCD忙标志BF，直到其为0，表示可以执行下一条指令
void WaitUntilReady(void)
{
	RS=0; //所读为状态位
	RW=1; //设为读状态
	Delay(165);
	EN=1;
	Delay(165);
	LCD_DATA=0xff;
	while(LCD_DATA&0x80); //不断循环，直至BF=0
	Delay(165);
	EN=0;
}

void WriteCommand(unsigned char Command , unsigned char flag_busy)
{ 
	if(flag_busy)
	WaitUntilReady();
	RS=0; //写入的是命令字
	RW=0; //置为写状态
	EN=1; 
	LCD_DATA = Command;
	Delay(165);
	EN=0;
}

void WriteData(unsigned char Data)
{
	WaitUntilReady(); //等待指令执行完毕
	RS=1; //写入的是数据
	RW=0; //置为写状态
	EN=1;
	LCD_DATA = Data;
	Delay(165);
	EN=0;
}

void Initialize_LCD(void)
{ 
	Delay(165);
	WriteCommand(0x38,0); //设为8位接口模式，显示2行字符,busy=0不检测忙信号
	Delay(165);
	WriteCommand(0x38,0);
	Delay(165);
	WriteCommand(0x38,0);
	WriteCommand(0x38,1);
	WriteCommand(0x08,1); //显示关闭
	WriteCommand(0x01,1); //显示清屏
	WriteCommand(0x06,1); //写入新数据后光标右移
	WriteCommand(0x0c,1); //显示功能开，不显示光标
	WriteCommand(0x81,1); //写地址
	WriteData('H');
	WriteData('e');
	WriteData('l');
	WriteData('l');
	WriteData('o');	 
	WriteData('!');
}