lcd.h

在车头有4个光敏电阻做的寻找光源的小车程序 具有笔战功能 ICC-AVR ATmega16L 做的控制器 找到光源后停车

#define LCD_EN_PORT    PORTB   //以下2个要设为同一个口
#define LCD_EN_DDR     DDRB
#define LCD_RS_PORT    PORTB   //以下2个要设为同一个口
#define LCD_RS_DDR     DDRB
#define LCD_DATA_PORT  PORTB  //以下3个要设为同一个口
#define LCD_DATA_DDR   DDRB   //一定要用高4位
#define LCD_DATA_PIN   PINB

#define LCD_RS         (1<<PB7) //0x80   portB7       out 
#define LCD_EN         (1<<PB6) //0x60   portB6       out 
#define LCD_DATA       ((1<<PB5)|(1<<PB4)|(1<<PB3)|(1<<PB2)) 

unsigned char tab[]={'0','1','2','3','4','5','6','7','8','9'};
/*--------------------------------------------------------------------------------------------------
函数声明    
--------------------------------------------------------------------------------------------------*/
void LCD_init(void);
void LCD_en_write(void);
void LCD_write_command(unsigned  char command) ;
void LCD_write_data(unsigned char data);
void LCD_set_xy (unsigned char x, unsigned char y);
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s);
void LCD_write_char(unsigned char X,unsigned char Y,unsigned char data);

/*补充*/
void LCD_write_shu(unsigned int x,unsigned int t,unsigned int n);
/*补充*/

void delay_nus(unsigned int n);
void delay_nms(unsigned int n);

void LCD_init(void)         //液晶初始化
{
  LCD_DATA_DDR|=LCD_DATA;   //数据口方向为输出
  LCD_EN_DDR|=LCD_EN;       //设置EN方向为输出
  LCD_RS_DDR|=LCD_RS;       //设置RS方向为输出
  LCD_write_command(0x28); 
  LCD_en_write();
  delay_nus(40);
  LCD_write_command(0x28);  //4位显示
  LCD_write_command(0x0c);  //显示开
  LCD_write_command(0x01);  //清屏
  delay_nms(2);
}

void LCD_en_write(void)  //液晶使能
{
  LCD_EN_PORT|=LCD_EN;
  delay_nus(1);
  LCD_EN_PORT&=~LCD_EN;
}

void LCD_write_command(unsigned char command) //写指令 
{ 
  unsigned char temp;
  command=((command&0b10000000)>>7)|((command&0b01000000)>>5)|((command&0b00100000)>>3)|((command&0b00010000)>>1)|((command&0b00001000)<<1)|((command&0b00000100)<<3)|((command&0b00000010)<<5)|((command&0b00000001)<<7);
  delay_nus(16);
  temp=command<<2; 
  LCD_RS_PORT&=~LCD_RS;        //RS=0 
  LCD_DATA_PORT&=0b11000011;         //清高四位 
  LCD_DATA_PORT|=temp&0b00111100; //写高四位 
  LCD_en_write(); 
  command=command>>2;          //低四位移到高四位 
  LCD_DATA_PORT&=0b11000011;         //清高四位 
  LCD_DATA_PORT|=command&0b00111100; //写低四位 
  LCD_en_write(); 
   
} 

void LCD_write_data(unsigned char data) //写数据 
{ 
  unsigned char temp;
  data=((data&0b10000000)>>7)|((data&0b01000000)>>5)|((data&0b00100000)>>3)|((data&0b00010000)>>1)|((data&0b00001000)<<1)|((data&0b00000100)<<3)|((data&0b00000010)<<5)|((data&0b00000001)<<7);
  delay_nus(16); 
  temp=data<<2;
  LCD_RS_PORT|=LCD_RS;       //RS=1 
  LCD_DATA_PORT&=0b11000011;       //清高四位 
  LCD_DATA_PORT|=temp&0b00111100;  //写高四位 
  LCD_en_write(); 
  data=data>>2;               //低四位移到高四位 
  LCD_DATA_PORT&=0b11000011;        //清高四位 
  LCD_DATA_PORT|=data&0b00111100;   //写低四位 
  LCD_en_write(); 
}


void LCD_set_xy( unsigned char x, unsigned char y )  //写地址函数
{
    unsigned char address;
    if (y == 0) address = 0x80 + x;
    else   address = 0xc0 + x;
    LCD_write_command( address);
}
  
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s) //列x=0~15,行y=0,1
{
    LCD_set_xy( X, Y ); //写地址    
    while (*s)  // 写显示字符
    {
      LCD_write_data( *s );
      s ++;
    }
      
}

void LCD_write_char(unsigned char X,unsigned char Y,unsigned char data) //列x=0~15,行y=0,1
{
  LCD_set_xy( X, Y ); //写地址
  LCD_write_data( data);
}



void delay_1us(void)                 //1us延时函数
  {
   asm("nop");
  }

void delay_nus(unsigned int n)       //N us延时函数
  {
   unsigned int i=0;
   for (i=0;i<n;i++)
   delay_1us();
  }
  
void delay_1ms(void)                 //1ms延时函数
  {
   unsigned int i;
   for (i=0;i<1140;i++);
  }
  
void delay_nms(unsigned int n)       //N ms延时函数
  {
   unsigned int i=0;
   for (i=0;i<n;i++)
   delay_1ms();
  }

unsigned char *Format(unsigned char data,unsigned char *str)
{  
  str[0]=tab[(data/10)%10];
  str[1]=tab[data%10];
  return str; 
 }

void LCD_write_shu(unsigned int x,unsigned int t,unsigned int n)
{
  unsigned int wan;
  unsigned int qian;
  unsigned int bai;
  unsigned int shi;
  unsigned int wei;
  wan=n/10000;
  qian=(n-wan*10000)/1000;
  bai=(n-wan*10000-qian*1000)/100;
  shi=(n-wan*10000-qian*1000-bai*100)/10;
  wei=(n-wan*10000-qian*1000-bai*100-shi*10);
  LCD_write_char(x++,t,tab[wan]);
  LCD_write_char(x++,t,tab[qian]);
  LCD_write_char(x++,t,tab[bai]);
  LCD_write_char(x++,t,tab[shi]);
  LCD_write_char(x,t,tab[wei]); 
  x=0;
}