MC9S12XS128控制12864液晶头文件

/*LCD命令函数声明 #define uchar unsigned char #define uint unsigned int void lcd_write_cmd(uchar com); void lcd_write_data(uchar date); void lcd_write_string(uchar *str); void lcd_pos(uchar x,uchar y); //从第X行的第Y位置开始显示，xy都从1开始 void lcd_clear(); void mouse_left(); void mouse_right(); void mouse_on(); void mouse_off(); void lcd_init(); */ #include <hidef.h> /* common defines and macros */ #include "derivative.h" /* derivative-specific definitions */ #define uchar unsigned char #define uint unsigned int //8bit数据接入IO口 #define Part PORTB //PB接8位数据线 //控制数据端 #define LCD_RS PORTA_PA0 //定义12864液晶RS端,寄存器选择信号 H:数据寄存器 L:指令寄存器 #define LCD_RW PORTA_PA1 //定义12864液晶RW端,读/写信号 H:读 L:写 #define LCD_EN PORTA_PA2 //定义12864液晶LCDEN端, 片选信号 下降沿触发,锁存数据 void delay(uint xms) //总线时钟24M { uint i,j; for(j=0;j<xms;j++) for(i=0;i<500;i++); } //==================================== //LCD忙检测函数 char lcd_busy() { char result; DDRB=0X00; //读数据 LCD_RS=0; LCD_RW=1; LCD_EN= 1; result=Part & 0x80; LCD_EN=0; DDRB=0XFF; //写数据 return result; } //===================================== //液晶写命令函数 void lcd_write_cmd(uchar com) { delay(5); while(lcd_busy()); LCD_RS=0; //选择指令寄存器 LCD_RW=0; //写 LCD_EN=0; Part=com; //指令值赋给P0口 LCD_EN=1; delay(5); LCD_EN=0; } //===================================== //液晶写一个字符数据函数 void lcd_write_data(uchar date) { delay(5); while(lcd_busy()); LCD_RS=1; //选择数据寄存器 LCD_RW=0; //写 LCD_EN=0; Part=date; //数据值赋给P0口 LCD_EN=1; delay(5); LCD_EN=0; } //===================================== //液晶写一个字符串函数 void lcd_write_string(char *str) { while(*str!='\0') //未结束 lcd_write_data(*str++); } //===================================== //液晶显示位置函数 void lcd_pos(char x,char y) //从第X行的第Y位置开始显示 { char pos; if(x==1) //第一行 x=0x80; if(x==2) //第二行 x=0x90; if(x==3) //第三行 x=0x88; if(x==4) //第四行 x=0x98; pos=x+y-1; //首地址为0X80 lcd_write_cmd(pos); } void lcd_clear() //清屏 { lcd_write_cmd(0x01); lcd_pos(1,5); lcd_write_data(' '); } void mouse_left() //光标左移 { lcd_write_cmd(0x10); } void mouse_right() //光标右移 { lcd_write_cmd(0x14); } void mouse_on() //光标闪烁 { lcd_write_cmd(0x0f); } void mouse_off() //光标不闪烁 { lcd_write_cmd(0x0c); } //===================================== //液晶初始化函数 void lcd_init() { DDRA=0XFF; //写数据 DDRB=0XFF; lcd_write_cmd(0x30); //基本指令集，绘图显示关 delay(5); mouse_off(); //开显示，不显示光标 delay(5); lcd_clear(); //清屏 delay(5); lcd_write_cmd(0x06); //写一个字符后地址指针自动加1 delay(5); }