1602LCD liquid crystal reverse display program based on 51 single chip microcomputer

/*1602LCD demonstration program*/
/*MCU model: AT89S51*/
/*Crystal: 11.0592MHZ*/
/*Author: http://www.51hei.com */ /*Compilation environment: Keil 7.50A*/ /****Include header file*****/ #include #include /******************Port definition can be modified according to your circuit*******/ sbit rs=P3^5; sbit rw=P2^7; sbit cs=P3^4; sbit ep=P3^4;/*****Display data table*******/ unsigned char code dis1[] = {"xu han jun"}; unsigned char code dis2[] = {"best wishes"}; /******************** Function: LCD delay subroutine Input parameter: ms Output parameter: ********************/ void delay(unsigned char ms) { unsigned char i; while(ms--) { for(i = 0; i<250; i++) { _nop_(); _nop_(); _nop_(); _nop_(); } } } /******************** Function: Test LCD busy status Input parameter: Output parameter: result **********************/ bit lcd_bz() { bit result; rs = 0; rw = 1; ep = 1; _nop_(); _nop_(); _nop_(); _nop_(); result = (bit)(P0 & 0x80); ep = 0; return result; } /***************** Function: Write instruction data to LCD subroutine Input parameter: cmd Output parameter: ***************/ void lcd_wcmd(unsigned char cmd) { while(lcd_bz());//Judge whether LCD is busy rs = 0; rw = 0; ep = 0; _nop_(); _nop_(); P0 = cmd; _nop_(); _nop_ () ; _nop_(); _nop_(); ep = 1; _nop_(); _nop_(); _nop_(); _nop_(); ep = 0; } /************************* Function: Set display position subroutine Input parameter: posExit parameter: *************************/ void lcd_pos(unsigned char pos) { lcd_wcmd(pos | 0x80); } /*********************** Function: Write display data to LCD subroutine Input parameter: datExit parameter: ************************/ void lcd_wdat(unsigned char dat) { while(lcd_bz()); //Judge whether LCD is busy rs = 1; rw = 0; ep = 0;






























































































P0 = dat;
_nop_();
_nop_();
_nop_();
_nop_();
ep = 1;
_nop_(); _nop_
();
_nop_();
_nop_();
ep = 0;
}
/**********************
Function: LCD initialization subroutine
Input parameter:
Output parameter:
***********************/
void lcd_init()
{
lcd_wcmd(0x38);
delay(1);
lcd_wcmd(0x0c);
delay(1);
lcd_wcmd(0x01);
delay(1);
lcd_wcmd(0x04);
delay(1);
}
/*****************
Function: Main program
Input parameter:
Output parameter:
********************/
void main(void)
{
unsigned char i;
lcd_init();// Initialize LCD
delay(10);
lcd_pos(0x0E);//Set display position
i = 0;
while(dis1[i] != '\0')
{
lcd_wdat(dis1[i]);//Display character
i++;
}
lcd_pos(0x4E);//Set display position
i = 0;
while(dis2[i] != '\0')
{
lcd_wdat(dis2[i]);//Display character
i++;
}
while(1);
}