單片機(jī)寫(xiě)LCD1602液晶程序源碼

本程序的pdf格式的原理圖下載: http://www.torrancerestoration.com/f/ks51.pdf 

/***********寫(xiě)1602液晶**************/
/**
*功能：寫(xiě)1602液晶
*時(shí)間：二〇一四年三月十五日 08:59:26
*作者：寒竹子
**/

#include <reg52.h>
#include <intrins.h>

typedef unsigned int uint;
typedef unsigned char uchar;

//LCD1602
sbit LCD1602_RS = P1^0;
sbit LCD1602_RW = P1^1;
sbit LCD1602_EN = P1^5;

void LCD1602_Wait();
void writeCmd_LCD1602(uchar cmd);
void writeData_LCD1602(uchar dat);
void LCD1602_Init();
void writeString_LCD1602(uchar * pstr);
void LCD1602_ShowStr(uchar x, uchar y, uchar * pstr);

void main()
{
LCD1602_Init();

/*
writeCmd_LCD1602(0x00 | 0x80);
writeData_LCD1602('C');

writeString_LCD1602("Hanzhuzi");
*/
LCD1602_ShowStr(0, 0, "han zhu ying xue");
LCD1602_ShowStr(0, 1, "QQ:1754410821");
while (1);
}

//LCD1602判忙準(zhǔn)備
void LCD1602_Wait()
{
uchar sta = 0;//讀取液晶當(dāng)前狀態(tài)
P0 = 0xFF;//讀取狀態(tài)時(shí)必須把總線拉高才能正確的讀取其狀態(tài)！否則寫(xiě)入有時(shí)不成功！��！
LCD1602_RS = 0;
LCD1602_RW = 1;

do
{
LCD1602_EN = 1;
sta = P0;//讀取狀態(tài)
LCD1602_EN = 0;//避免液晶輸出數(shù)據(jù)影響到總線P0上的其他器件
} while (sta & 0x80);//檢測(cè)第七位是否為1，若為1繼續(xù)等待直到0為止
}

//LCD1602寫(xiě)命令
void writeCmd_LCD1602(uchar cmd)
{
//在進(jìn)行讀寫(xiě)數(shù)據(jù)之前要進(jìn)行液晶忙碌等待
LCD1602_Wait();

LCD1602_RS = 0;
LCD1602_RW = 0;
LCD1602_EN = 0;
P0 = cmd;
LCD1602_EN = 1;//高脈沖送入命令
LCD1602_EN = 0;//避免液晶輸出數(shù)據(jù)影響其他的器件
}

//LCD1602寫(xiě)數(shù)據(jù)
void writeData_LCD1602(uchar dat)
{
LCD1602_Wait();

LCD1602_RS = 1;
LCD1602_RW = 0;
LCD1602_EN = 0;
P0 = dat;//送入數(shù)據(jù)
LCD1602_EN = 1;//高脈沖
LCD1602_EN = 0;//避免液晶輸出數(shù)據(jù)影響到其他器件
}

//LCD1602初始化
void LCD1602_Init()
{
writeCmd_LCD1602(0x38);//5*7點(diǎn)陣，16*2顯示
writeCmd_LCD1602(0x0C);//開(kāi)顯示，不顯示光標(biāo)
writeCmd_LCD1602(0x06);//數(shù)據(jù)指針++，光標(biāo)++
writeCmd_LCD1602(0x01);//清屏
}

//LCD1602寫(xiě)String
void writeString_LCD1602(uchar * pstr)
{
while (*pstr)
{
writeData_LCD1602(*pstr++);
}
}

//LCD1602按地址寫(xiě)
void LCD1602_ShowStr(uchar x, uchar y, uchar * pstr)
{
uchar addr = 0;
//判斷RAM地址
if (y == 0) //LCD1602的左上角地址是 (0, 0)
{
addr = (0x00 + x);//確定x坐標(biāo)，x為偏移量
}
else
{
addr = (0x40 + x);//第二行
}

//寫(xiě)入地址
writeCmd_LCD1602(addr | 0x80);//地址是從0x80H開(kāi)始的

//寫(xiě)入數(shù)據(jù)
while (*pstr != '\0')
{
writeData_LCD1602(*pstr++);
}
}