#include <ioavr.h> #include <ina90.h>#define uchar unsigned char#define LCD_PORT  PORTA#define LCD_DDR   DDRA#define LCD_PIN   PINA#define LCD_DATA       ((1<<0)|(1<<1)|(1<<2)|(1<<3))#define EN_SET PORTC|=(1<<6);//en拉高#define EN_CLR PORTC&=~(1<<6);//en拉低#define RS_SET PORTC|=(1<<4);#define RS_CLR PORTC&=~(1<<4);#define RW_SET PORTC|=(1<<5);#define RW_CLR PORTC&=~(1<<5);#define SETBIT(x,y)   (x|=(1<<y))      //set bit y in byte x#define CLRBIT(x,y)   (x&=(~(1<<y)))   //clear bit y in byte xxvoid DelayUs(unsigned char us)//delay us{ unsigned char uscnt; uscnt=us>>1;/* Crystal frequency in 12MHz*/ while(--uscnt);}//<<<<<<<<<<<<<<<<<<<<LCD检查忙程序>>>>>>>>>>>>>>>>>>>>>>void LCD_Check_busy(void){  RS_CLR;  RW_SET;  LCD_DDR = 0x00;  _NOP();  EN_SET;  while(LCD_PIN & 0x08)  {    ;  }  EN_CLR;  LCD_DDR = 0xff; }//--------------------------------------------------------------------------------//--------------------------------------------------------------------------------//设置所需函数//写数据线命令(四线模式数据要分两次写)void out_dataline(uchar dat){  DelayUs(10000);// LCD_Check_busy();    LCD_PORT &= 0x0F;  LCD_PORT |=  dat&0xF0;       //写高四位数据  EN_SET;//SETBIT(LCD_PORT, EN);  //EN=1   _NOP();  EN_CLR;//CLRBIT(LCD_PORT, EN);  //EN=0    _NOP();    LCD_PORT &= 0x0F;  LCD_PORT |=  (dat<<4)&0xF0;       //写高四位数据    EN_SET;//SETBIT(LCD_PORT, EN);  //EN=1  _NOP();  EN_CLR;//CLRBIT(LCD_PORT, EN);  //EN=0}//一、写指令函数void write_command(unsigned char com){  DelayUs(10000);// LCD_Check_busy();   RS_CLR;//CLRBIT(LCD_PORT, RS); //RS=0  out_dataline(com);}//二、写数据函数(四线模式数据要分两次写)void write_data(unsigned char data){  DelayUs(10000);// LCD_Check_busy();  RS_SET;//SETBIT(LCD_PORT, RS); //RS=1  out_dataline(data);}//三、初始化LCD1602函数void LCD_init(void){  LCD_DDR = 0xFF;       //设为输出  DDRC=0XFF;    RW_CLR;//CLRBIT(LCD_PORT, RW); //设为永远W状态  write_command(0x28);  DelayUs(100000);     write_command(0x0D);   DelayUs(1000000);  write_command(0x01);  //显示开--对应开关显示控制指令   DelayUs(10000);  write_command(0x06);  //清屏--对应清屏指令    }//四、写地址函数//--------------------------------------------------------------------------------//要显示字符时要先输入显示字符地址，也就是告诉模块在哪里显示字符//1602液晶内部显示地址//比如第二行第一个字符的地址是40H，那么是否直接写入40H就可以将光标定位在第二行第一个字符的位置呢？//这样不行，因为写入显示地址时要求最高位D7恒定为高电平1所以实际写入的数据应该?//?1000000B（40H）＋10000000B（80H）＝11000000B（C0H）//--------------------------------------------------------------------------------void LCD_set_addr(unsigned char x, unsigned char y) //x:0~15,y:0~1{  if(y)  {    write_command(0xc0 + x);  //第二行显示  }  else  {    write_command(0x80 + x);  //第一行显示  }}//五、写字符函数void LCD_write_char(unsigned char X, unsigned char Y,                    unsigned char data) //列x=0~15,行y=0,1{  LCD_set_addr(X, Y);   //写地址  write_data(data);}//六、写字符串函数void LCD_write_string(unsigned char X, unsigned char Y, unsigned char* s) //列x=0~15,行y=0,1{  LCD_set_addr(X, Y);   //写地址  while(*s)   // 写显示字符  {    write_data(*s);    s ++;  }}