电子星系工程pic实验指导7

1、实验七阅读（要求做相应的笔记记录）阅读1602液晶片手册二、硬件电路（内部线已连接，不需要外部排线）1602液晶猜座cn7 cn8!*>>*> >>*>*>>>>>说明：vss:电源地；vdd:电源；vl（第3脚）：提供偏压，电压太低无显示，电压太高全黑；rs/rw/e:控制总线；db0-db7:数据总线；r25：背光led限流电阻1602, 一共可以两行，每行16个字符显示；上电运行后要先设置工作模式；每个字符显示有一个对应的寄存器地址，在寄存器中写入ascii字符值，就 可以显示相应的字符。三、测试代码include <

2、;pl8f452.h>调用头文件# include <delays.h>#de行ne rspin p0rtbbits.rb5 /data or instrument select#define rwpin portbbits.rb4 /write or read#define epin portbbits.rb3 /6800 mode enable single名称：1602忙检测函数/-void lcd_wait_busy(void)itrisdbits.trisd7=l;为读状态做准备rspin=0;选择指令寄存器rwpin=1;选择读epin= 1;使能线电平变化whi

3、le(portdbits.rd7= 1);读忙状态，不忙时退出epin=0;恢复使能线电平trisdbits.trisd7=0;/-名称：1602写命令函数/-void lcd_write_com(unsigned char combuf)rspin=0;选择指令寄存器rwpin=0;选择写portd=combuf;把命令字送入rdepin= 1;使能线电平变化，命令送入1602的8位数据口delay 1tcy();1epin=0;恢复使能线电平/-名称:1602写命令函数(带忙检测)/void lcd_write_com_busy(unsigned char combuf)lcd_wait_

4、busy();/调用忙检测函数lcd_write_com(combuf'); 调用写命令两数/名称：1602写数据函数(带忙检测)/void lcd_write_data(unsigned char databuf)lcd_wait_busy(); 调用忙检测函数rspin=1;rwpin=0;portd=databuf;epin= 1;选择数据寄存器选择写把数据字送入p2使能线电平变化，命令送入1602的8位数据delay 1tcy();epin=0;恢复使能线电平/名称:1602显示地址写函数/void lcd_write_address(unsigned char x,unsig

5、ned char y)x&=0x0f;列地址限制在0-15y&=0x01;行地址限制在0-1if(y=0x00)icd_write_com_busy(xl0x80);第一行的列地址写入elselcd_write_com_bu sy (x+0 x4o)iox8o);第二彳亍的列地址写入/名称：1602初始化函数/void lcdreset(void)delay 100tcyx( 15);lcd_write_com(0x3 8);delaylootcyx(5);lcd_write_com(0x38);delay 100tcyx(5);lcd_write_com(0x3 8);lcd

6、_write_com_busy(0x38);8 位数据，双列，5*7 字形显示功能关，无光标清屏指令写入新的数据后，光标右移，显示屏不显示功能开，无光标，icd_write_com_busy(0x08);lcd_write_com_busy(0x01);icd_write_com_busy(0x06); 移动lcd_write_com_busy(oxoc);)/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_wr

7、ite_data(buf)； 写入显示数据/名称：主函数/void main(void)所有io均为数字口，模拟量输入禁止adcon 1=0x06;trisb=0b 11000111;/rb3-5 设置为输出trisd=0b00000000;/rd 设置为输出lcdreset();复位 1602lcd_write_char(0,0,0x41);/alcd_write_char( 1,0,0x42);/blcd_write_char(2,0,0x43);/clcd_write_char(3,0,0x44);/dlcd_write_char(4,0,0x45);/elcd_write_char(5

8、,0,0x46);/flcd_write_char(6,0,0x47);/glcd_write_char(7,0,0x48);/hlcd_write_char(8,0,0x49);/ilcd_write_char(9,0,0x4a);/jlcd_write_char( 10,0,0x4b);/klcd_write_char( 11,0,0x4c);/llcd_write_char( 12,0,0x4d);/mlcd_write_char( 13,0,0x4e);/nlcd_write_char( 14,0,0x4f);/olcd_write_char( 15,0,0x50);/plcd_wri

9、te_char(0,1,0x61);/alcd_write_char( 1,1,0x62);/blcd_write_char(2,l ,0x63);/clcd_write_char(3,l ,0x64);/dlcd_write_char(4,1,0x65);/elcd_write_char(5,l ,0x66);/flcd_write_char(6,1,0x67);/glcd_write_char(7,1,0x68);/hlcd_write_char(8,l ,0x69);/ilcd_write_char(9,1,0x6a);/jlcd_write_char( 10,1,0x6b);/klcd_write_char( 11,1,0x6c);/ilcd_write_char( 12,1,0x6d);/mlcd_write_char( 13,1,0x6e);/