"/ this program has been debugged
//Next, call the instance
//////////////////////////////////
//LCD1602 read / write header file
//Four wire drive mode
//////////////////////////////////
#include
#include “LCD1602.h”
/*-----------
Pins are defined in the LCD header file
-----------*/
void main（void）{
LCD_ init（）;
p=LCD_ PutStr（“Hello Lcd1602！\ n”，-1）; // Display a text
p=LCD_ PutNum（1234，2，p）; // The number 12.34 is displayed
while（1）;
}
/*---------------------------------------------------------
LCD lcd1602c uses 4 data lines (D4 ~ D7)
-----------------------------------------------------------*/
/*-------------------------------------------------------------
LCD pin definition
1---GND
2---VCC
3---VO
4---RS
5---RW
6---EN
7 to 14 -- d0-d7
15 -- backlight+
16 -- backlight-
-----------------------------------------------------------------*/
#include
#include
Reference address: http://www.21ic.com/app/mcu/201812/784986.htm
#define LCD_ DATA P2
sbit LCD1602_ RS=P2^2;
sbit LCD1602_ EN=P2^3;
int p=0;
/*--------------------------------------------------------------------------------------------------
Function description
--------------------------------------------------------------------------------------------------*/
void LCD_ init（void）;
void LCD_ en_ write（void）;
void LCD_ write_ command（unsigned char command） ;
void LCD_ write_ data（unsigned char Recdata）;
void LCD_ set_ xy （unsigned char x， unsigned char y）;
void LCD_ write_ string（unsigned char X，unsigned char Y，unsigned char *s）;
void LCD_ write_ char（unsigned char X，unsigned char Y，unsigned char Recdata）;
void delay_ nus（unsigned int n）;
void delay_ nms（unsigned int n）;
void delay_ 1US (void) / / 1US delay function
{
_ nop_（）;
}
void delay_ NUS (unsigned int n) / / n US delay function
{
unsigned int i=0;
for （i=0; i delay_ 1us（）;
}
void delay_ 1ms (void) / / 1ms delay function
{
unsigned int i;
for （i=0; i《1140; i++）;
}
void delay_ NMS (unsigned int n) / / N MS delay function
{
unsigned int i=0;
for （i=0; i delay_ 1ms（）;
}
void LCD_ Init (void) / / LCD initialization
{
LCD_ write_ command（0x28）;
delay_ nus（40）;
LCD_ write_ command（0x28）;
delay_ nus（40）;
LCD_ write_ command（0x28）;
delay_ nus（40）;
LCD_ en_ write（）;
delay_ nus（40）;
LCD_ write_ command（0x28）; // 4-digit display
LCD_ write_ command（0x0c）; // Display on
LCD_ write_ command（0x01）; // Clear screen
delay_ nms（2）;
}
void LCD_ en_ Write (void) / / LCD enable
{
LCD1602_ EN=1;
delay_ nus（1）;
LCD1602_ EN=0;
}
void LCD_ write_ Command (unsigned char command) / / write instruction
{
delay_ nus（16）;
LCD1602_ RS=0; // RS=0
LCD_ DATA&=0X0f; // Qinggao four
LCD_ DATA|=command&0xf0; // Write four digits higher
LCD_ en_ write（）;
command=command《《4; // Shift from low four to high four
LCD_ DATA&=0x0f; // Qinggao four
LCD_ DATA|=command&0xf0; // Write down four digits
LCD_ en_ write（）;
}
void LCD_ write_ Data (unsigned char recdata) / / write data
{
delay_ nus（16）;
LCD1602_ RS=1; // RS=1
LCD_ DATA&=0X0f; // Qinggao four
LCD_ DATA|=Recdata&0xf0; // Write four digits higher
LCD_ en_ write（）;
Recdata=Recdata《《4; // Shift from low four to high four
LCD_ DATA&=0X0f; // Qinggao four
LCD_ DATA|=Recdata&0xf0; // Write down four digits
LCD_ en_ write（）;
}
void LCD_ set_ XY (unsigned char x, unsigned char y) / / address writing function
{
unsigned char address;
if （y == 0） address = 0x80 + x;
else address = 0xc0 + x;
LCD_ write_ command（address）;
}
void LCD_ write_ Char (unsigned char x, unsigned char y, unsigned char recdata) / / column x = 0 ~ 15, row y = 0, 1
{
LCD_ set_ xy（X， Y）; // Write address
LCD_ write_ data（Recdata）;
}
int LCD_ PutStr（unsigned char *DData，int pos）{
unsigned char i;
if（pos==-1）{
LCD_ write_ command（0x01）; // Clear screen
delay_ nms（2）;
pos=0;
}
while（（*DData）！=‘\ 0’）{
switch（*DData）{
Case '\ n': / / if yes, wrap
{
if（pos《17）{
for（i=pos; i《16; i++）
LCD_ write_ char（i%16， i/16， ‘ ’）;
pos=16;
}
else{
for（i=pos; i《32; i++） LCD_ write_ char（i%16， i/16， ‘ ’）;
pos=32;
}
break;
}
Case '\ B': / / if it is \ B, backspace
{
if（pos》0） pos--;
LCD_ write_ char（pos%16， pos/16， ‘ ’）;
break;
}
default：
{
if（（*DData）《0x20）{
*DData=‘ ’;
}
LCD_ write_ char（pos%16， pos/16，*DData）;
pos++;
break;
}
}
DData++;
}
return（pos）;
}
//----------------------------The following functions are used to output numbers---------------------
int LCD_ Putnum (unsigned long num, int XS, int POS) {/ / count from the right and keep several decimal places
unsigned long tmp=0;
unsigned char numbits=0;
if（pos==-1）{
LCD_ write_ command（0x01）;
delay_ nms（2）;
pos=0;
}
if（num==0）{
LCD_ write_ char（pos%16， pos/16， ‘0’）;
pos++;
}
else{
if（num《0）{
LCD_ write_ char（pos%16， pos/16， ‘-’）;
num*=（-1）;
pos++;
}
while（num）{
tmp=tmp*10+（num%10）;
num=num/10;
numbits++;
}
while（tmp）{
LCD_ write_ char（pos%16， pos/16， （tmp%10）+48）;
tmp=tmp/10;
pos++;
numbits--;
if（numbits==XS） pos=LCD_ PutStr（“。”， pos）; // Show decimal point
}
while（numbits--）{
LCD_ write_ char（pos%16， pos/16， ‘0’）;
pos++;
}
}
return（pos）;
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