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#define setXy(x,y) lcdWrite(0,(x<<6)|(y&15)|0x80)
#define dataA 4
#define dataB 5
#define commPin 6
void lcdWrite(byte RS,char dat)
{
byte i;
for (i = 2; i > 0; --i) //運行兩次，分別對應字節高4位和低4位
{
digitalWrite( dataB,dat & 0x80); //LED_D7口。置位數據口為1。如果D7是1，先給D7位的C4充電（C1、C2、C3也會充滿電，這里不用管），在跌到低電平之前，將其他3個位充好電，再將1602使能讀入，即可完成半個字節數據的讀入。
digitalWrite( dataA,dat & 0x20); //LED_D5口。置位數據口為1
digitalWrite( commPin,RS);//置位命令口為1。如果RS是1，是數據，0是命令
delayMicroseconds(400); //683電容，延時400us
digitalWrite( commPin,HIGH); //置位命令口為1
digitalWrite( dataB,dat & 0x40); //LED_D6口。置位數據口為1
digitalWrite( dataA,dat & 0x10); //LED_D4口。置位數據口為1
delayMicroseconds(1); //0.5us < t < 1.36us
digitalWrite( commPin,LOW); //命令口清零，1602使能，讀入數據
delayMicroseconds(50);
dat <<= 4;
}
}
void lcdPrint(char *p)
{
while(*p) lcdWrite(1,*p++);
}
void lcdInit(void)
{
byte i = 3;
digitalWrite( dataB,LOW); //D7=0
digitalWrite( commPin,LOW); //命令口清零
delayMicroseconds(400); //683電容，延時400us
do{
digitalWrite( dataB,LOW); //D6=0
delayMicroseconds(1);
digitalWrite( dataA,HIGH); //D5=1
delayMicroseconds(400); //683電容，延時400us
if (i == 0) {digitalWrite( dataA,LOW); } //D4=0
digitalWrite( commPin,HIGH); //置位命令口為1
delayMicroseconds(3);
digitalWrite( commPin,LOW); //命令口清零
delayMicroseconds(3);
}while(i--);
delay(100);
lcdWrite(0,0x28); //4線 2行 5x7
delay(50);;
lcdWrite(0,0x06);//輸入方式自動增量，沒有顯示移位
delay(50);;
lcdWrite(0,0x0c);//開啟顯示屏，光標不顯示，無閃爍
delay(50);;
lcdWrite(0,0x01);//清除顯示屏，地址計數器AC歸零
delay(50);;
}
int adc;
void setup()
{
byte aa=45;
pinMode(dataA,OUTPUT);
pinMode(dataB,OUTPUT);
pinMode(commPin,OUTPUT);
delay(100);
lcdInit();//對LCD進行初始化
}
void loop()
{
setXy(0,0);
lcdPrint(" ");
setXy(0,0);
lcdPrint("The value is:");
setXy(1,0);
lcdPrint(" ");
setXy(1,0);
lcdPrint("352");
delay(1000);

復制代碼

#include <reg52.h>
typedef unsigned char u8; //0 to 255
typedef unsigned int u16; //0 to 65535
typedef unsigned long u32; //0 to 4294967295
sbit EN_RS = P2^5;
sbit D4_D6 = P2^6;
sbit D5_D7 = P2^7;
#define SetRS 0x01
#define RstRS 0x00
void Delay2ms() //@12.000MHz
{
unsigned char i, j;
i = 4;
j = 225;
do
{
while (--j);
}
while (--i);
}
void Delay200us() //@12.000MHz
{
unsigned char i;
i = 97;
while (--i);
}
void ThreeWire(u8 dat)
{
EN_RS = (bit)(dat & 0x01);
D4_D6 = (bit)(dat & 0x40);
D5_D7 = (bit)(dat & 0x80);
Delay200us();
D4_D6 = (bit)(dat & 0x10);
D5_D7 = (bit)(dat & 0x20);
EN_RS = 1;
EN_RS = 0;
D4_D6 = 0;
D5_D7 = 0;
Delay200us();
}
void LCD_Init_4bit();
void LCD_WChar_4bit(u8 Row, u8 Address, char chr);
void LCD_WStr_4bit(u8 Row, u8 Address, char *Str);
void LCD_WCMD(u8 Cmd)
{
ThreeWire(RstRS | (Cmd & 0xF0));
ThreeWire(RstRS | (Cmd << 4));
}
void LCD_WDAT(u8 Dat)
{
ThreeWire(SetRS | (Dat & 0xF0));
ThreeWire(SetRS | (Dat << 4));
}
void LCD_Init_4bit()
{
LCD_WCMD(0x02);
LCD_WCMD(0x28);
LCD_WCMD(0x0c);
LCD_WCMD(0x06);
LCD_WCMD(0x01);
Delay2ms();
}
void LCD_WChar_4bit(u8 Row, u8 Address, char chr)
{
if(Row == 1)LCD_WCMD(0x80 + Address);
if(Row == 2)LCD_WCMD(0xc0 + Address);
LCD_WDAT(chr);
}
void LCD_WStr_4bit(u8 Row, u8 Address, char *Str)
{
if(Row == 1)LCD_WCMD(0x80 + Address);
if(Row == 2)LCD_WCMD(0xc0 + Address);
while(*Str)
{
LCD_WDAT(*Str);
Str++;
}
}
void Delay1000ms() //@12.000MHz
{
unsigned char i, j, k;
i = 8;
j = 154;
k = 122;
do
{
do
{
while (--k);
}
while (--j);
}
while (--i);
}
u8 Count = 0;
void main()
{
EN_RS = 0;
D4_D6 = 0;
D5_D7 = 0;
LCD_Init_4bit();
LCD_WStr_4bit(1,0,"Hello World!");
LCD_WStr_4bit(2,0,"3 Wire LCD");
while (1)
{
LCD_WChar_4bit(2,13,Count/100%10 + '0');
LCD_WChar_4bit(2,14,Count/10%10 + '0');
LCD_WChar_4bit(2,15,Count%10 + '0');
Count++;
Delay1000ms();
}
}

復制代碼

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