lcd1602 Liquid Crystal

Include<reg52.h>//Contains header file, general situation does not need to change, header file contains the definition of special function register
#include <intrins.h>


Sbit RS = p2^6; Defining ports
Sbit RW = p2^5;
Sbit EN = p2^7;
Sbit SPK = p3^0;


unsigned char time[] = {' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ', ' 7 ', ' 8 ', ' 9 '};
unsigned char *clock = "23:59:54";
unsigned char hour,minute,second = 58,num;
unsigned char keyscan1 (void);
unsigned char updatetimerflag;


#define RS_CLR Rs=0
#define Rs_set Rs=1


#define RW_CLR rw=0
#define Rw_set Rw=1


#define EN_CLR en=0
#define En_set En=1


#define Dataport P0
#define Keyport P1


void Init_timer0 ();
void Gong_zi ();
void Clock_1 ();
void Clock_2 ();


void Delayus (unsigned char t)
{
while (--T);
}


void delayms (unsigned char t)
{
while (t--)
{
Delayus (245);
Delayus (245);
}
}


Function of a busy sentence
Bit lcd_check_busy ()
{
dataport = 0xFF;
RS_CLR;
Rw_set;
EN_CLR;
_nop_ ();
En_set;
return (BIT) (dataport & 0x80);


}


Write Command function
void lcd_write_com (unsigned char Com)
{
while (Lcd_check_busy ()); Busy is waiting for
Delayms (5);
RS_CLR;
RW_CLR;
En_set;
dataport = com;
_nop_ ();
EN_CLR;


}


Write Data functions
void Lcd_write_data (unsigned char Data)
{
while (Lcd_check_busy ()); Busy is waiting for
Delayms (5);
Rs_set;
RW_CLR;
En_set;
Dataport= Data;
_nop_ ();
EN_CLR;
}


Clear Screen function
void Lcd_clear ()
{
Lcd_write_com (0x01);
Delayms (5);
}


Write String function
void lcd_write_string (unsigned char x,unsigned char y,unsigned char *s)
{
if (y = = 0)
{
Lcd_write_com (0x80 +x);
}
Else
{
Lcd_write_com (0XC0+X);
}
while (*s)
{
Lcd_write_data (*s);
s++;
}

}


Write character function
void Lcd_write_char (unsigned char x,unsigned char y,unsigned char Data)
{
if (y = = 0)
{
Lcd_write_com (0x80 +x);
}
Else
{
Lcd_write_com (0XC0+X);
}
Lcd_write_data (Data);
}


initialization function


void Lcd_init ()
{
Lcd_write_com (0x38);
Delayms (5);
Lcd_write_com (0x38);
Delayms (5);
Lcd_write_com (0x38);
Delayms (5);
Lcd_write_com (0x38);
Lcd_write_com (0x08);
Lcd_write_com (0x01);
Lcd_write_com (0x06);
Delayms (5);
Lcd_write_com (0x0c);
}


/*void t0_time () Interrupt 1
{
TH0 = 0xd8;
TL0 = 0XF0;
min_sec++;
if (min_sec = 100)
{
min_sec = 0;
sec++;
if (sec = 60)
{
SEC = 0;
}
}

} */


Main function
void Main ()
{
unsigned char i;
unsigned char *p;
Lcd_init ();
Lcd_clear ();
/* Tmod = 0X01;
TH0 = 0xd8;
TL0 = 0XF0;
EA = 1; Open Total Interrupt
ET0 = 1; Open Timer 0
TR0 = 1; Start Timer 0 * *
/* while (1)
{
i = 1;
p = "Hello world!";
Lcd_clear ();
Lcd_write_string (2,0, "Yzh");
Delayms (250);
while (*P)
{
Lcd_write_char (I,1,*P);
i++;
p++;
Delayms (250);
}
Delayms (250);
}
Gong_zi ();
Clock_1 ();
Lcd_write_com (0x87);
Lcd_write_data (0x00);
} */
Clock_2 ();


}
/*void Gong_zi ()
{
Lcd_write_com (0x40);
Lcd_write_data (0x1f);
Lcd_write_com (0x41);
Lcd_write_data (0x1f);
Lcd_write_com (0x42);
Lcd_write_data (0x04);
Lcd_write_com (0x43);
Lcd_write_data (0x04);
Lcd_write_com (0x44);
Lcd_write_data (0x04);
Lcd_write_com (0x45);
Lcd_write_data (0x04);
Lcd_write_com (0x46);
Lcd_write_data (0x1f);
Lcd_write_com (0x47);
Lcd_write_data (0x1f);
}*/