- #include <pic18.h> //调用头文件，可以去PICC18软件下去查找PIC18FXX2.H
- __CONFIG(1,XT) ; //晶振为外部4M
- __CONFIG(2,WDTDIS) ; //看门狗关闭
- __CONFIG(4,LVPDIS) ; //禁止低电压编程
-
- #define RSPIN RB5 //0 input instrument;1 input data
- #define RWPIN RB4 //0 give LCD write instrument or data;1 read LCD information
- #define EPIN RB3 //1 read infor;1-0 action instrument
-
- //名称: 1602检测到忙
- void lcd_wait_busy(void)//RS R/W DB7 DB6~DB0
- {//读取忙信号或AC地址信号：0 1 FB AC内容7位
- //BF=1 表示液晶显示忙，暂无法接受单片机数据或指令
- TRISD7=1;//为读状态做准备
- RSPIN=0;//选择指令寄存器
- RWPIN=1;//选择读
- EPIN=1; //使能电平，1，读信息
- while(RD7==1);//，BF=1表示液晶显示器忙
- EPIN=0;
- TRISD7=0;
- }
- //名称: 1602写命令函数（带忙检测）
- void lcd_write_com_busy(unsigned char combuf)
- {
- lcd_wait_busy(); //调用忙检测函数
- RSPIN=0;//input instrument
- RWPIN=0;//give LCD writing instrument or data
- PORTD=combuf;//command to PD
- EPIN=1;
- asm("NOP");
- EPIN=0;//1 to 0 action instrument
- }
-
- //名称: 1602写数据函数（带忙检测）
- void lcd_write_data_busy(unsigned char combuf)
- {
- lcd_wait_busy(); //调用忙检测函数
- RSPIN=1;
- RWPIN=0;
- PORTD=combuf;
- EPIN=1;
- asm("NOP");
- EPIN=0;
- }
- //名称: 1602写给显示地址函数
- void lcd_write_address(unsigned char x,unsigned char y)
- {
- x&=0x0f; //列地址限制在0-15
- y&=0x01; //行地址限制在0-1
- if(y==0x00)//送地址的时候应该是0x80+Address
- lcd_write_com_busy(x|0x80); //第一行的列地址写入
- else//second row 0x40
- lcd_write_com_busy((x+0x40)|0x80); //第二行的列地址写入
- }
- //名称: 指定地址写入函数
- void lcd_write_char(unsigned char x,unsigned char y,unsigned char buf)
- {
- lcd_write_address(x,y); //写入地址
- lcd_write_data_busy(buf); //写入显示数据
- }
-
- //初始化开始
- void lcdreset(void)
- {
- lcd_write_com_busy(0x38); //功能设定指令,设定数据总线位数、显示的行数及字型。
- lcd_write_com_busy(0x08); //显示开关控制指令,显示功能关,无光标
- lcd_write_com_busy(0x01); //清屏指令
- lcd_write_com_busy(0x06); //进入模式，每次定入1位数据后光标右移，屏不移动
- lcd_write_com_busy(0x14); //设定显示屏或光标移动方向指令,写入新的数据后，光标右移，显示屏不移动
- lcd_write_com_busy(0x0c); //显示功能开，无光标,不闪烁
- }
-
- void main()
- {
- ADCON1=0X06; //所有IO均为数字口，模拟量输入禁止
- TRISB=0B11000111; //RB3-5设置为输出
- TRISD=0B00000000; //RD设置为输出
- lcdreset();
- lcd_write_char(0,0,0x41); //A
- lcd_write_char(1,0,0x42); //B
- lcd_write_char(2,0,0x43); //C
- lcd_write_char(3,0,0x44); //D
- lcd_write_char(4,0,0x45); //E
- lcd_write_char(5,0,0x46); //F
- lcd_write_char(6,0,0x47); //G
- lcd_write_char(7,0,0x48); //H
- lcd_write_char(8,0,0x49); //I
- lcd_write_char(9,0,0x4A); //J
- lcd_write_char(10,0,0x4B); //K
- lcd_write_char(11,0,0x4C); //L
- lcd_write_char(12,0,0x4D); //M
- lcd_write_char(13,0,0x4E); //N
- while(1)
- {
-
- }
- }
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