lcm1602a.c

LCD1602的程序,只需调用其中几个函数就可以,C51版的

#include <reg52.h>
#include<INTRINS.H>
#define lcd_data_p0 P2
#define lcd_control_p2 P3
#define lcd_RS 0x40 //P3^6
#define lcd_RW 0x20 //P3^5
#define lcd_EN 0x10 //P3^4
/*sbit lcd_RS=P2^7;
sbit lcd_RW=P2^6;
sbit lcd_EN=P2^5;*/

#define busy 0x80   //LCD_DB7

void lcd_init(void);
void lcd_write_command(unsigned char command,unsigned char wait_en);
void lcd_write_data(unsigned char char_data);
void wait_enable(void);
void display_a_char(unsigned char position,unsigned char char_data);
void display_a_string(unsigned char col,unsigned char *ptr);
void delay_1ms(void);
void delay_nms(unsigned int n);

unsigned char str1[]="  CHANNEL--0:   ";
unsigned char str2[]="  SPEED:  .  m/s";
/*------------------------------------主函数-------------------------------------------*/
//CD上显示neutronlmk和www.miaokun.com两行字符
void main(void)
{
 unsigned char i;
 unsigned long j;
 lcd_init();
/* for(i=0;i<16;i++)
 {
 display_a_char(i,0x30+i);
 }*/
// display_a_string(0,str1);
 display_a_string(1,str2);
 display_a_char(24,0x34);
 display_a_char(25,0x35);
 display_a_char(27,0x30);
 //for(i=0x30;i<=0x39;i++)
 //{for (j=0;j<9000;j++);
 //display_a_char(27,i);
 //for (j=0;j<9000;j++);
 //}
 while(1);
}

/*------------------------------------液晶驱动函数-------------------------------------*/
//液晶初始化
void lcd_init(void)
{
//cd_data_p0=0xff;
//lcd_control_p2=0x07;
 delay_nms(20);
 lcd_write_command(0x38,0);//显示模式设置三次(此时不管lcd空闲与否)
 delay_nms(10);
 lcd_write_command(0x38,0);
 delay_nms(10);
 lcd_write_command(0x38,0);
 delay_nms(10);
 lcd_write_command(0x38,1);//显示模式设置(从此之后均需lcd空闲)
 lcd_write_command(0x08,1);//显示关闭
 lcd_write_command(0x01,1);//显示清屏
 lcd_write_command(0x06,1);//显示光标移动设置
 lcd_write_command(0x0c,1);//显示开及光标设置
 _nop_();
 }

//写指令函数: E=高脉冲 RS=0 RW=0
void lcd_write_command(unsigned char command,unsigned char wait_en)//command为指令，wait_en指定是否要检测LCD忙信号
{
 if(wait_en)
 wait_enable();//若wait_en为1，则要检测LCD忙信号，等待其空闲
 lcd_control_p2&=~lcd_RS;//RS=0
 lcd_control_p2&=~lcd_RW;//RW=0
 lcd_control_p2&=~lcd_EN;//E=0,下面给LCD一个高脉冲
 _nop_();
 lcd_control_p2|=lcd_EN;//E=1
 lcd_data_p0=command;
 lcd_control_p2&=~lcd_EN;//重设E=0
}

//写数据函数: E =高脉冲 RS=1 RW=0
void lcd_write_data(unsigned char char_data)
{
 wait_enable();//等待LCD空闲
 lcd_control_p2|=lcd_RS;//RS=1
 lcd_control_p2&=~lcd_RW;//RW=0
 lcd_control_p2&=~lcd_EN;//E=0,下面给LCD一个高脉冲
 _nop_();
 lcd_control_p2|=lcd_EN;//E=1
 lcd_data_p0=char_data;
 lcd_control_p2&=~lcd_EN;//重设E=0
}

//正常读写操作之前必须检测LCD控制器状态:E=1 RS=0 RW=1;DB7: 0 LCD控制器空闲，1 LCD控制器忙。
//检测忙信号,等待LCD空闲函数
void wait_enable(void)
{  unsigned int  i;
   for(i=0;i<100;i++);
}

//指定位置显示一个字符:第一行位置0~15,第二行16~31
//显示一个字符函数
void display_a_char(unsigned char position,unsigned char char_data)//参数position指定位置0~31,char_data为要显示的字符
{
 unsigned char position_tem;

 wait_enable();//等待LCD空闲
 if(position>=0x10)
 position_tem=position+0xb0;
 else
 position_tem=position+0x80;
 lcd_write_command(position_tem,1);
 lcd_write_data(char_data);
}

//指定一行显示连续字符串:0显示在第一行,1显示在第二行,注字符串不能长于16个字符
//显示一行连续字符串函数
void display_a_string(unsigned char col,unsigned char *ptr)//参数col指定行,*ptr指字符串数组的首指针
{
 unsigned char col_tem,i;
 wait_enable();//等待LCD空闲
 col_tem=col<<4;//若col为1(即在LCD第二行显示字符串),先把col左移4位,使显示字符的首位置改到第二行首位,即位置16
 for(i=0;i<16;i++)
 {
  display_a_char(col_tem++,*(ptr+i));
 }
}

/*---------------------------------------延时函数-------------------------------------*/
//1ms延时函数
void delay_1ms(void)
{
 unsigned int i;
 for(i=0;i<20;i++);

 }
//n ms延时函数
void delay_nms(unsigned int n)
{
 unsigned int i;
 for(i=0;i<n;i++)
 {
   delay_1ms();
 }
}