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1602顯示屏只顯示白塊，燒寫后同樣如此。在網(wǎng)上找的程序：
#include "stc15.h"
/********IO引腳定義***********************************************************/
sbit LCD_RS=P1^2;//定義引腳
sbit LCD_RW=P1^1;
sbit LCD_E=P1^0;
/********宏定義***********************************************************/
#define LCD_Data P0
#define Busy 0x80 //用于檢測LCD狀態(tài)字中的Busy標(biāo)識
/********數(shù)據(jù)定義*************************************************************/
unsigned char code uctech[] = {"Happy every day"};
unsigned char code net[] = {"www.lydz8.com"};
/********函數(shù)聲明*************************************************************/
void WriteDataLCD(unsigned char WDLCD); //寫數(shù)據(jù)
void WriteCommandLCD(unsigned char WCLCD,BuysC); //寫命令
unsigned char ReadDataLCD(void); //讀數(shù)據(jù)
unsigned char ReadStatusLCD(void); //讀狀態(tài)
void LCDInit(void); //初始化
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData); //相應(yīng)坐標(biāo)顯示字節(jié)內(nèi)容
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData); //相應(yīng)坐標(biāo)開始顯示一串內(nèi)容
void Delay5Ms(void); //延時(shí)
void Delay400Ms(void); //延時(shí)
/***********主函數(shù)開始********************************************************/
void main(void)
{
Delay400Ms(); //啟動(dòng)等待，等LCD講入工作狀態(tài)
LCDInit(); //初始化
Delay5Ms(); //延時(shí)片刻(可不要)
DisplayListChar(0, 0, uctech);
DisplayListChar(1, 5, net);
ReadDataLCD(); //測試用句無意義
while(1);
}
/***********寫數(shù)據(jù)********************************************************/
void WriteDataLCD(unsigned char WDLCD)
{
ReadStatusLCD(); //檢測忙
LCD_Data = WDLCD;
LCD_RS = 1;
LCD_RW = 0;
LCD_E = 0; //若晶振速度太高可以在這后加小的延時(shí)
LCD_E = 0; //延時(shí)
LCD_E = 1;
}
/***********寫指令********************************************************/
void WriteCommandLCD(unsigned char WCLCD,BuysC) //BuysC為0時(shí)忽略忙檢測
{
if (BuysC) ReadStatusLCD(); //根據(jù)需要檢測忙
LCD_Data = WCLCD;
LCD_RS = 0;
LCD_RW = 0;
LCD_E = 0;
LCD_E = 0;
LCD_E = 1;
}
/***********讀數(shù)據(jù)********************************************************/
unsigned char ReadDataLCD(void)
{
LCD_RS = 1;
LCD_RW = 1;
LCD_E = 0;
LCD_E = 0;
LCD_E = 1;
return(LCD_Data);
}
/***********讀狀態(tài)*******************************************************/
unsigned char ReadStatusLCD(void)
{
LCD_Data = 0xFF;
LCD_RS = 0;
LCD_RW = 1;
LCD_E = 0;
LCD_E = 0;
LCD_E = 1;
while (LCD_Data & Busy); //檢測忙信號
return(LCD_Data);
}
/***********初始化********************************************************/
void LCDInit(void)
{
LCD_Data = 0;
WriteCommandLCD(0x38,0); //三次模式設(shè)置，不檢測忙信號
Delay5Ms();
WriteCommandLCD(0x38,0);
Delay5Ms();
WriteCommandLCD(0x38,0);
Delay5Ms();
WriteCommandLCD(0x38,1); //顯示模式設(shè)置,開始要求每次檢測忙信號
WriteCommandLCD(0x08,1); //關(guān)閉顯示
WriteCommandLCD(0x01,1); //顯示清屏
WriteCommandLCD(0x06,1); //顯示光標(biāo)移動(dòng)設(shè)置
WriteCommandLCD(0x0C,1); //顯示開及光標(biāo)設(shè)置
}
/***********按指定位置顯示一個(gè)字符*******************************************/
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
{
Y &= 0x1;
X &= 0xF; //限制X不能大于15，Y不能大于1
if (Y) X |= 0x40; //當(dāng)要顯示第二行時(shí)地址碼+0x40;
X |= 0x80; //算出指令碼
WriteCommandLCD(X, 0); //這里不檢測忙信號，發(fā)送地址碼
WriteDataLCD(DData);
}
/***********按指定位置顯示一串字符*****************************************/
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData)
{
unsigned char ListLength;
ListLength = 0;
Y &= 0x1;
X &= 0xF; //限制X不能大于15，Y不能大于1
while (DData[ListLength]>=0x20){ //若到達(dá)字串尾則退出
if (X <= 0xF){ //X坐標(biāo)應(yīng)小于0xF
DisplayOneChar(X, Y, DData[ListLength]); //顯示單個(gè)字符
ListLength++;
X++;
}
}
}
/***********短延時(shí)********************************************************/
void Delay5Ms(void)
{
unsigned int TempCyc = 5552;
while(TempCyc--);
}
/***********長延時(shí)********************************************************/
void Delay400Ms(void)
{
unsigned char TempCycA = 5;
unsigned int TempCycB;
while(TempCycA--){
TempCycB=7269;
while(TempCycB--);
}
}
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