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調試過程總結一下：
1）由于找不到de1620資料，不知道它de操作時序。看到一些帖子說1620和1602沒區別，還shi有點將信將疑。后面用網友編寫de1602程序試驗，才知道它們倆沒啥區別。
2）關于shi否檢測LCD處于空閑，覺得還shi最好在寫指令和寫數據時都加上。不檢測，會導致顯示結果不正常。
3）由于連線很多14根（加上背光就shi16根），如果有一根除了問題就會影響到顯示。所以我shi用萬用表一根線一根線量了之后才通電試驗de。
4）看到很多帖子都建議在初始化LCD前延時幾十毫秒。本例中并沒有延時，顯示也正常。
5）總de說來，不shi很難。在遇到問題時只要能夠仔細分析，就能找出原因和解決方法。自己前幾天在試程序時就shi顯示結果不對，一直在檢查自己de程序，沒想到原來shi單片機deFlash到壽命了……那個郁悶啊…………
頭文件中有五個函數:
Function1.unsigned char AskBusy(void) 詢問LCD1620shi否空閑, 返回值"1"空閑, "0"為忙;
Function2.WritEDAta(char data) 寫數據到LCD1620;
Function3.WriteCommand(char command) 寫指令到LCD1620;
Function4.PutOneCharLCD(x,y,*Disp) 在LCD1620上顯示一個字符, x,y定義位置
Function5.PutStringLCD(a,b,*DispString) 在LCD1620上顯示一個字符串, a,b定義初始位置. Function6.LCD_Init() 初始化LCD
在使用此頭文件之前,必須有以下宏定義:
#define DataPortPullup PORTx
#define DataPortDirection DDRx
#define ReadLCDPin PINx
#define CtrlPortPullup PORTx
#define CtrlPortDirection DDRx
#define RS_Bit Px?
#define RW_Bit Px?
#define E_Bit Px?
其中“x”代表B,C,D(mega8中無A口)，"?"代表“0~1”
完整頭文件如下（解釋搞了一大堆，也學學用英語……）：
/*******************************************************/
/* Project :1620 Display Headfile */
/* Date :2008,3,11 */
/* Author :lhy */
/* Version :v1.1 */
/* Rework :lhy */
/* Rework Date :2008.4.28 */
/* */
/* Comments : */
/* 1 Function Description */
/* Function1.unsigned char AskBusy(void) */
/* --Calls this Fun to ask if LCD is busy, */
/* 1--free,0--busy; */
/* Function2.WritEDAta(char data) */
/* --Write data to LCD */
/* Function3.WriteCommand(char command) */
/* --write command to LCD */
/* Function4.PutOneCharLCD(x,y,*Disp) */
/* --Put one char to LCD. */
/* Function5.PutStringLCD(a,b,*DispString) */
/* --Put String to LCD. Max length 32bits. */
/* */
/* 2 How to use */
/* Before use this HeadFile, */
/* need to define as below: */
/* #define DataPortPullup PORTx */
/* #define DataPortDirection DDRx */
/* #define ReadLCDPin PINx */
/* #define CtrlPortPullup PORTx */
/* #define CtrlPortDirection DDRx */
/* #define RS_Bit Px? */
/* #define RW_Bit Px? */
/* #define E_Bit Px? */
/* x -> A,B,C,D... */
/* ? -> 0,1,2,3,4,5,6,7 */
/* And set control port output,like this: */
/* CtrlPortDirection |= */
/* (1<<E_Bit) | (1<<RS_Bit) | (1<<RW_Bit); */
/* 3 Add the Function "LCD_Init(void)" */
/* Before this Fun, you must set control port */
/* output. */
/*******************************************************/
#ifndef _LCD1620_h
#define _LCD1620_h
//Calls this Fun to ask if LCD is busy,1--free,0--busy
unsigned char AskBusy(void)
{
DataPortDirection = 0x00;
DataPortPullup = 0xff;//enable pullup res
CtrlPortPullup |= (1<<RW_Bit);//Set RW
CtrlPortPullup &= ~(1<<RS_Bit);//Clear RS
CtrlPortPullup |= (1<<E_Bit);//set enable pin
if((ReadLCDPin & (1<<7))==0)
return 1;//lcd is free
else
return 0;//lcd is busy
}
//wait until LCD was free
void WaitForFree(void)
{
unsigned char BusyBit;
do
{
BusyBit = AskBusy();
}
while(BusyBit !=1);
CtrlPortPullup &= (~1<<E_Bit);//Clear enable pin
}
//Write data to LCD
void WritEDAta(char data)
{
WaitForFree();
CtrlPortPullup &= ~(1<<RW_Bit);//Clear RW
CtrlPortPullup |= (1<<RS_Bit);//Set RS
DataPortDirection = 0xff;
DataPortPullup = data;
CtrlPortPullup |= (1<<E_Bit);//set E
CtrlPortPullup &= ~(1<<E_Bit);//Clear E
}
//write command to LCD
void WriteCommand(char command)
{
WaitForFree();
CtrlPortPullup &= ~(1<<RS_Bit);//Clear RS
CtrlPortPullup &= ~(1<<RW_Bit);//Clear RW
DataPortDirection |= 0xff;
DataPortPullup = command;
CtrlPortPullup |= (1<<E_Bit);//set E
CtrlPortPullup &= ~(1<<E_Bit);//Clear E
}
//Write one char to LCD.
void PutOneCharLCD(unsigned char x,unsigned char y,unsigned char *Disp)
{
unsigned char Location;
if(x == 0)
{
Location = y | (1<<7);
}
else if(x == 1)
{
Location = y | (1<<6) |(1<<7);
}
WriteCommand(Location);
WritEDAta(*Disp);
}
//Write String to LCD. Max length 32bits(determined by the location of the first byte).
void PutStringLCD(unsigned char a,unsigned char b,unsigned char *DispString)
{
do
{
PutOneCharLCD(a,b,DispString);
b ++;
DispString ++;
}
while((b <= 15) && (*DispString));
if(*DispString)
{
a ++;//Jump to 2nd row.
b = 0;
do
{
PutOneCharLCD(a,b,DispString);
b ++;
DispString ++;
}
while((b <= 15) && (*DispString));
}
}
//Initialize the LCD1620
void LCD_Init(void)
{
WriteCommand(0x38);//16X2,5X7 lattice,8 bit for transmit
WriteCommand(0x08);//Close the display and cursor
WriteCommand(0x0f);//Set cursor and enable dispaly
WriteCommand(0x06);
WriteCommand(0x01);//Clear the screen
}
#endif
把此頭文件包含到主程序中：
/*******************************************************/
/* Project :1620 Display Function */
/* Compiler :ICCAVR 6.03A */
/* Date :2008,4，28 */
/* Author :lhy */
/* Chip type :Atmega8 */
/* Comments : */
/*******************************************************/
＃i nclude "iom8v.h"
#define DataPortPullup PORTD
#define DataPortDirection DDRD
#define ReadLCDPin PIND
#define CtrlPortPullup PORTC
#define CtrlPortDirection DDRC
#define RS_Bit PC0
#define RW_Bit PC1
#define E_Bit PC2
＃i nclude "LCD1620.h"
void main()
{
OSCCAL=0XA5;
CtrlPortDirection |= ((1<<E_Bit)|(1<<RS_Bit)|(1<<RW_Bit));
LCD_Init();
PutStringLCD(0,0,"Li Heng Yuan is a good boy!!");
}
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66821730(技術支持)
