电子星系工程pic实验指导7.doc

实验七一、 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）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 /调用头文件#include #define RSPIN PORTBbits.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) TRISDbits.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; /使能线电平变化 while(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RD EPIN=1; /使能线电平变化，命令送入1602的8位数据口 Delay1TCY(); EPIN=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_busy();/调用忙检测函数 lcd_write_com(combuf); /调用写命令函数/-/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; /选择数据寄存器 RWPIN=0; /选择写 PORTD=databuf; /把数据字送入P2 EPIN=1; /使能线电平变化，命令送入1602的8位数据口 Delay1TCY(); 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,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) lcd_write_com_busy(x|0x80); /第一行的列地址写入 else lcd_write_com_busy(x+0x40)|0x80); /第二行的列地址写入/-/名称: 1602初始化函数 /-void lcdreset(void) Delay100TCYx(15); lcd_write_com(0x38); Delay100TCYx(5); lcd_write_com(0x38); Delay100TCYx(5); lcd_write_com(0x38); lcd_write_com_busy(0x38); /8位数据，双列，5*7字形 lcd_write_com_busy(0x08);/显示功能关，无光标 lcd_write_com_busy(0x01);/清屏指令 lcd_write_com_busy(0x06);/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， /-/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(buf);/写入显示数据 /-/名称: 主函数 /- void main(void) 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(); /复位1602 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 lcd_write_char(14,0,0x4F); /O lcd_write_char(15,0,0x50); /P lcd_write_char(0,1,0x61); /a lcd_write_char(1,1,0x62); /b lcd_write_char(2,1,0x63); /c lcd_write_char(3,1,0x64); /d lcd_write_char(4,1,0x65); /e lcd_write_char(5,1,0x66); /f lcd_write_char(6,1,0x67); /g lcd_write_char(7,1,0x68); /h lcd_write_char(8,1,0x69); /i lcd_write_char(9,1,0x6A); /j lcd_write_char(10,1,0x6B); /k lcd_write_char(11,1,0x6C); /l lcd_write_char(12,1,0x6D); /m lcd_write_char(13,1,0x6E); /n