AVR单片机驱动的LCD2004的源程序

/*=======================================================

20×4字符液晶主程序,编译软件(ICCAVR_6.31)

CPU内部晶振8M

数据线B0~B7接PORTB, E=D7 RW=D6 RS=D5

=========================================================

接线图如下:

_______________ ______________

| –1|GND |

| –2|+5V |

| –3|V0 |

| | |

PD5|——–4|RS |

PD6|——–5|RW |

PD7|——–6|E |

CPU | | |

ATmmega16L PB0|——–7|D0 LCD20x4 |

PB1|——–8|D1 |

PB2|——–9|D2 |

PB3|——-10|D3 |

PB4|——-11|D4 |

PB5|——-12|D5 |

PB6|——-13|D6 |

PB7|——-14|D7 |

| | |

| –15|+LED |

| –16|-LED |

_______________| |______________|

========================================================*/

＃i nclude //CPU_ATmmega16L

#define RS_H asm(“sbi 0x12,5”) //RS设为高电平

#define RS_L asm(“cbi 0x12,5”) //RS设为低电平

#define RW_H asm(“sbi 0x12,6”) //RW设为高电平

#define RW_L asm(“cbi 0x12,6”) //RW设为低电平

#define E_H asm(“sbi 0x12,7”) //E设为高电平

#define E_L asm(“cbi 0x12,7”) //E设为低电平

//=======================================================

//微秒级延时程序

void delay_us(int time)

{

do

{

time–;

}

while (time > 1);

}

//=======================================================

//毫秒级延时程序

void delay_ms(unsigned int time)

{

while(time != 0)

{

delay_us(1000);

time–;

}

}

//=======================================================

//读取lcd是否内部操作(繁忙)状况

char Lcd_Busy()

{

char r;

DDRB = 0x00; //端口B设为输入方法

E_L;RS_L;RW_H; //E=0(致能),RS=0(指令),RW=1(读)

delay_us(2); //液晶延时子程序

E_H;

delay_us(2); //液晶延时子程序

r = PINB & 0x80; //读取lcd_data第八位

E_L;

DDRB=0xff; //端口B设为输出方法

return r; //读取成果回来

}

//=======================================================

//向Lcd发送指令程序

void Lcd_Command(unsigned char Command)

{

while(Lcd_Busy()); //判别lcd是否内部操作状况

E_L;RS_L;RW_L; //E=0(致能),RS=0(指令),RW=0(写)

delay_us(2); //液晶延时子程序

E_H;

PORTB = Command; //向Lcd发送指令

delay_us(2); //液晶延时子程序

E_L;

}

//=======================================================

//向lcd写入一个字符程序

void Lcd_Write(unsigned char Data)

{

while(Lcd_Busy()); //判别lcd是否内部操作状况

E_L;RS_H;RW_L; //E=0(致能),RS=1(数据),RW=0(写)

delay_us(2); //液晶延时子程序

E_H;

PORTB = Data; //向lcd写入一个字符

delay_us(2); //液晶延时子程序

E_L;

}

/*=======================================================

LCD第1行显现地址1~20(0x80~0x93)

LCD第2行显现地址1~20(0xc0~0xd3)

LCD第3行显现地址1~20(0x94~0xa7)

LCD第4行显现地址1~20(0xd4~0xe7)

=======================================================*/

//初始化LCD_8位接口,4行x20字符的工作方法

void Lcd_Init()

{

DDRB = 0xff; //端口B设为输出方法

DDRD = 0xff; //端口D设为输出方法

Lcd_Command(0x38); //

Lcd_Command(0x38); //

Lcd_Command(0x38); //

Lcd_Command(0x38); //

Lcd_Command(0x08); //令显现器off

Lcd_Command(0x01); //铲除显现器

Lcd_Command(0x06); //令LCD每接收到1Byte数据后,AC主动加1

Lcd_Command(0x0C); //令光标,0x0c=不显现,0x0d=显现闪烁.

}

//=======================================================

//写ASCII字符串程序

void asc_tran(unsigned char *asc)

{

while((*asc) != 0) //判别字是否完毕

{

Lcd_Write(*asc); //向lcd写入字符串

asc++; //移下一个字符

}

}

//=======================================================

//测验主LCD主程序

void main()

{

Lcd_Init(); //初始化LCD

while(1)

{

Lcd_Command(0x83); //设置显现位址

asc_tran(“—–@_@——“); //显现字符串

Lcd_Command(0x97); //设置显现位址

asc_tran(“www.ouravr.com”); //显现字符串

delay_ms(1000); //推迟1秒

Lcd_Command(0x01); //铲除显现器

Lcd_Command(0x83); //设置显现位址

asc_tran(“—–^_^——“); //显现字符串

Lcd_Command(0x94); //设置显现位址

asc_tran(“http://59.36.96.196”); //显现字符串

delay_ms(1000); //推迟

Lcd_Command(0x01); //铲除显现器

}

}