12864 Driver Based on 51 Single-Chip Microcomputer

/************** Dis_12864.h ***************/

# Include <reg52.h>

# Ifndef _ dis_12864_h __
# DEFINE _ dis_12864_h __

# Define uchar unsigned char
# Define uint unsigned int

/* 12864 port definition */
# Define LCD _data P0 // data port
Sbit LCD _rs = p1 ^ 0; // register selection Input
Sbit LCD _rw = p1 ^ 1; // LCD read/write control
Sbit LCD _en = P2 ^ 5; // LCD enabling control

Sbit LCD _psb = p1 ^ 2; // string/parallel control

/* Function declaration */
Void delay (int ms );
Void LCD _init ();
Void BEEP ();
Void dataconv ();
Void LCD _pos (uchar X, uchar y); // determine the display position
Void zifu_dis (uchar X, uchar y, uchar * Dis );

# Endif

/************** Dis_12864.c ***************/

# Include <dis_12864.h>

/*************************************** ****************************/
// Latency Function
/*************************************** ****************************/
Void delay (ms int)
{
While (MS --)
{
Uchar I;
For (I = 0; I <250; I ++)
{
;;;;
}
}
}
/*************************************** ****************************/
/* Check the LCD busy status */
/* When LCD _busy is 1, it is busy. Wait. When LCD-busy is 0, it is idle and can write commands and data. */
/*************************************** ****************************/
Bit LCD _busy ()
{
Bit result;
LCD _rs = 0;
LCD _rw = 1;
LCD _en = 1;
Delay (1 );
Result = (BIT) (LCD _data & 0x80 );
LCD _en = 0;
Return (result );
}
/*************************************** ****************************/
/* Write command data to LCD */
/* Rs = L, RW = L, E = high pulse, D0-D7 = instruction code. */
/*************************************** ****************************/
Void LCD _wcmd (uchar cmd)
{
While (LCD _busy ());
LCD _rs = 0;
LCD _rw = 0;
LCD _en = 0;
Delay (1 );
LCD _data = cmd;
Delay (1 );
LCD _en = 1;
Delay (1 );
LCD _en = 0;
}
/*************************************** ****************************/
/* Write the display data to the LCD */
/* Rs = H, RW = L, E = high pulse, D0-D7 = data. */
/*************************************** ****************************/
Void LCD _wdat (uchar dat)
{
While (LCD _busy ());
LCD _rs = 1;
LCD _rw = 0;
LCD _en = 0;
LCD _data = dat;
Delay (1 );
LCD _en = 1;
Delay (1 );
LCD _en = 0;
}
/*************************************** ****************************/
/* LCD initialization settings */
/*************************************** ****************************/
Void LCD _init ()
{


LCD _psb = 1; // parallel port Mode

LCD _wcmd (0x34); // extended command operation
Delay (5 );
LCD _wcmd (0x30); // basic command operation
Delay (5 );
LCD _wcmd (0x0c); // display on, close the cursor
Delay (5 );
LCD _wcmd (0x01); // clear the LCD display content
Delay (5 );
}


/*************************************** ******************/
/* Set the display position X: number of rows Y: Number of columns */
/*************************************** ******************/
Void LCD _pos (uchar X, uchar y)
{
Uchar Pos;
If (x = 0)
{X = 0x80 ;}
Else if (x = 1)
{X = 0x90 ;}
Else if (x = 2)
{X = 0x88 ;}
Else if (x = 3)
{X = 0x98 ;}
Pos = x + y;
LCD _wcmd (POS); // display address
}

/*************************************** ******************/
/* Display characters (strings) at the specified position )*/
/*************************************** ******************/
Void zifu_dis (uchar X, uchar y, uchar * Dis)
{
Uchar I;
LCD _pos (x, y );
I = 0;
While (DIS [I]! = '\ 0 ')
{// Display characters
LCD _wdat (DIS [I]);
I ++;
}
}

/************* Main. c ***** test ***********/

# Include <reg52.h>
# Include <intrins. h>
# Include <dis_12864.h>

Uchar code dis1 [] = {"gz_go blog "};
Uchar code dis2 [] = {"www.csdn.net "};
Uchar code dis3 [] = {"keep learning! "};
Uchar code dis4 [] = {"keep thinking! "};

Void main (void)
{
Delay (10); // latency
LCD _init (); // initialize the LCD
Zifu_dis (, "csdncsdn"); // the essence of the string returned is its starting address in the memory.
Zifu_dis (1, 0, dis2 );
Zifu_dis (2, 0, dis3 );
Zifu_dis (3, 0, dis4 );
While (1 );
}